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GENERAL FISHERIES COMMISSION FOR
THE MEDITERRANEAN
COMMISSION GÉNÉRALE DES PÊCHES
POUR LA MÉDITERRANÉE
SCSA Assessment Forms
SAC GFCM
Sub-Committee on Stock Assessment
> Enter <
__________________________
SCSA Assessment Forms
Constantina Karlou-Riga
SAC GFCM
Sub-Committee on Stock Assessment
Tool designer
(GFCM consultant)
FAO backstopping officer for SCSA Jordi Lleonart
Federico De Rossi
Matthew Camilleri
Abdellah SrourGFCM Deputy Executive Secretary /
Adviser fisheries management
GFCM Bio-Statistician
SCSA coordinator
__________________________
SCSA Assessment Forms
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SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
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SCSA Assessment Forms
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__________________________
SCSA Assessment Forms
Sheet Title Contents # of sheets Priority
P1 General information
about the fishery
Catches by gear and associated fleet. 1 or more Indispensable
A2
A3
If available
Set the objectives to be attained and recommendations for
their attainment.
Indispensable
Indispensable
If available,
requires A1
If available,
requires A1
If available
As many as used in
the analysis by OU
Z
D
Y Indirect methods: Y/R
Diagnosis
Objectives and
recommendations
1
1
Indirect methods: data
Synthesis of results of analyses and diagnosis on the state of
resources.
Description of model, data, parameters and results.
Detailed description of results by gear, structured by size or
age.
Description of data used by gear for the analysis in A1.
Indirect methods:
results of VPA
As many as used in
the analysis by OU
As many as used in
the analysis
A1
P2b
P2a
Accompanying species and regulations applicable to
opertaonal unit.
Fishery by Operational
Unit
Description of model used and of general results of an
analysis.
Indirect methods:
VPA, LCA
Description of model, data, parameters and results of each
analysis.
Indirect methods:
global model
As many as used in
the analysis
0
Biology of the species
Species, person in charge, date and code. All the sheets that
belong to the same assessment share this code.
At least as many as
the OU numbers
As many as used in
the analysis
At least as many as
the OU numbers
Time series for the operational in question, including structure
by size (or age).
Fishery by Operational
Unit
G
SAC GFCM
Sub-Committee on Stock Assessment
Indispensable
Indispensable1
1B
Preliminary basic data
on the assessment
Biological parameters used in the analyses (it is assumed that
only one set of parameters is used).
1 If availableOther Other assessment
methods
Description of model, data, parameters and results of other
assessment methods not included in the previous sheets.
Indispensable
If available
If available
SCSA Assessment Forms Release 2 (2007) beta version
Since the SAC, and SCSA, inception (1999) a set of assessment forms were made available to scientists in
order to provide a common framework to present assessments.
It has been decided to present a new release of these forms to facilitate their use. We took advantage of
these upgrade to modify and amend some aspects. We would like to receive comments and suggestions
from the users in order to improve the forms.
The structure of this new release is basically the same. The differences are:
• Migration from Word to Excel
• Some fields (yellow) are filled automatically
• Some sheets have been added
o A cover sheet with title, authors, species and GSAs
o A new sheet "other" allowing to include assessments based on methodologies other than the
usual ones.
o An abstract sheet to be included (copy/paste) in the SCSA report
• It is more clear what sheets or fields are compulsory to fill
• The sheets for direct methods have not been yet upgraded
Excerpts from the presentation of 1st version of the assessment forms (1999), however the sheet
"other" can be used in such a case
Each assessment consists of several sheets. Each assessment will take, at least, one sheet of paper numbered
“0” (Sheet #0) and will also include no less than one copy of sheets “B”, “P1” and “P2a” (now using the
current "operational units" terminology). It is not compulsory to fill out any of the other sheets that make up
this assessment form, but the person in charge is supposed to fill out some of them: otherwise no
assessment is actually made. There may be more than one copy in several cases. Sheets “D” (diagnosis) and
“Z” (conclusions and recommendations) should be considered as essential too.
__________________________
SCSA Assessment Forms
C Comments At the option of the person in charge. Unspecified If available
__________________________
SCSA Assessment Forms
1 DAY YEAR 1 1 1 1 1
0 0 0
1 GME
Source: -
0 0 0 2
Source: -
0 0 0 3
Source: -
1
2
3
0
A.Abella4, F. Colloca1, P. Sartor
2, A. Ligas
2, , M. Sbrana
2,
A.Mannini3,
1Dep. Environmental Biology, University of Rome “La Sapienza”, Italy
2Centro Interuniversitario di Biologia Marina, Livorno, Italy
3Dip.Te.Ris., Università di Genova, Italy
4ARPAT, Area Mare, RIBM, Livorno, Italy
Northwestern Mediterranean
Geographical Sub-Area
(GSA)*09 - Ligurian and North Tirrenian Sea
SAC GFCM
Sub-Committee on Stock Assessment
Species Scientific name*
18 October 2010Date*
Galeus melastomus- GME
MONTH
Code*
Combination of GSAs
Authors*
Geographical area*
Affiliation*
GME0910A.A
__________________________
SCSA Assessment Forms
Code: GME0910A.A
1
Date* 18
1
B G A1 A2 A3 Y Other D Z C
1 #REF! #REF! 1 #REF! 1 #REF! 1 1 #REF!
1 #REF! #REF! 1 #REF! 1 #REF! 1 1 #REF!
191
Au,
-18
Basic data on the assessment
Oct 2010 Authors*
1994-2011
Blackmouth catshark
Galeus melastomus- GME , , Species
Scientific
name*
Species
common
name*
Data Source
Sheet #0 (page 2)
Sheets filled out
Length cohort analysis; Yield
forecasting
Method of
assessment*
Comments, bibliography, etc.
Comments, bibliography, etc.
0
Description of the analysis
Type of data*
Software used*
0
------
catch assessment surveysData source*
0
P2a P2b
---
P1
GSA*
commercial catches, size structure of
the catch by gear, trawl surveys size
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
Assessment formSheet #0
A.Abella4, F. Colloca1, P. Sartor2, A. Ligas2, , M. Sbrana2,
A.Mannini3,
Period of time*09 - Ligurian and North Tirrenian Sea
Abella A., Serena F., Ria M., 2005. Distributional response to variations in abundance over spatial and temporal scales for juveniles of European hake (Merluccius merluccius) in the Western Mediterranean Sea. Fisheries Research, 71: 295–310.
Abella A.J., Serena F., 1998. Selettività e vulnerabilità del nasello nella pesca a strascico. Biol. Mar. Medit., 5 (2): 496-504.
Bartolino V., Colloca F., Sartor P., Ardizzone G., 2008b. Modelling recruitment dynamics of hake, Merluccius merluccius, in the central Mediterranean in relation to key environmental variables. Fisheries Research, 92: 277-288.
Bartolino V., Ottavi A., Colloca F., Ardizzone G.D., Stefánsson G. 2008a. Bathymetric preferences of juvenile European hake (Merluccius merluccius). ICES J. Mar. Sci. 65: 963-969.
Belcari P., Ligas A., Viva C., 2006. Age determination and growth of juveniles of the European hake, Merluccius merluccius (L., 1758), in the northern Tyrrhenian Sea (NW Mediterranean). Fisheries Research., 78: 211-217
Biagi F., Cesarini A., Sbrana M., Viva C., 1995. Reproductive biology and fecundity of Merluccius merluccius (Linnaeus, 1758) in the Northern Tyrrhenian Sea. Rapp. Comm. int. Mer Médit., 34: 23.
Carpentieri P., Colloca F., Ardizzone G.D., 2008. Daily ration and feeding activity of juvenile hake in the central Mediterranean Sea. J. Mar. Biol. Ass. U.K., 88 (7): 1493-1501.
Carpentieri P., Colloca F., Cardinale M., Belluscio A., Ardizzone G.D., 2005. Feeding habits of European hake (Merluccius merluccius) in the central Mediterranean Sea. Fisheries Bulletin US, 103 (2): 411-416.
Colloca F., Belluscio A., Ardizzone G.D., 2000. Sforzo di pesca, catture e gestione dello stock di nasello (Merluccius merluccius) in un’area del Tirreno centrale. Biol. Mar. Med 7(1): 117-129.
Colloca F., Carpentieri P., Balestri E., Ardizzone G.D., 2004. A critical habitat for Mediterranean fish resources: shelf-break areas with Leptometra phalangium (Echinodermata: Crinoidea). Marine Biology, 145: 1129-1142.
Colloca, F., V. Bartolino, G. Jona Lasinio L. Maiorano, P. Sartor and G. Ardizzone.- 2009. Identifying fish nurseries using density and persistence measures. Mar Ecol Prog Ser. 381: 287–296
De Ranieri S., Belcari P., Bertolini D., Biagi F., Chiericoni V., Cognetti A.G., Mori M., Nannini N., Reale B., Rocca V., Sartor P., Sbrana M., 1997. Reclutamento di alcune specie ittiche demersali nel Mar Tirreno Settentrionale. Biol. Mar. Medit., 4(1): 237-243.
Nannini N., Pinna D., Chiericoni V., Biagi F., Belcari P., 2001. Ciclo ovarico di Merluccius merluccius (Linnaeus, 1758) nel mar Tirreno settentrionale. Biol. Mar Medit., 8 (1): 745-748.
Orsi Relini L., Capparena M., Fiorentini F., 1989. Spatial–temporal distribution and growth of Merluccius merluccius recruits in the Ligurian Sea. Observations on the 0-group. Cybium 13: 263–270.
Orsi Relini L., Papaconstantinou C., Jukic-Peladic S., Souplet A., Gil de Sola L., Piccinetti C., Kavadas S., Rossi M., 2002. Distribution of the Mediterranean hake populations (Merluccius merluccius smiridus Rafinesque, 1810) (Osteichthyes: Gadiforems) based on six years monitoring by trawl surveys: some implications for management. Sci. Mar. 66 (Suppl.2): 21-38.
Reale B., Sbrana M., De Ranieri S., 1995. Population dynamics of Merluccius merluccius exploited by two different trawl-nets in the Northern Tyrrhenian Sea. Rapp. Comm. int. Mer Médit., 34: 254.
Sartor P., Carlini F., De Ranieri S., 2003a. Diet of young european hake (Merluccius merluccius) in the northern Tyrrhenian Sea. Biol. Mar. Medit. 10 (2): 904-908.
Sartor P., Sartini M., Reale B., Sbrana M., 2001b. Analysis of the discard practices in the Merluccius merluccius (l., 1758) bottom trawl fishery of the Northern Tyrrhenian Sea. Biol. Mar. Medit. 8(1): 771-774.
Sartor, P., Recasens L., Viva C., Lleonart J., 2001a. Analysis of the impact of the fishery on the adult population of European hake in the Northwestern Mediterranean. Rapp. Comm. Int. Mer Médit., 36: 321-322.
Au, D.W. & Smith, S.E. 1997. A demographic method with population density compensation for estimating productivity and yield per recruit of the leopard shark (Triakis semifasciata). Canadian Journal of Fisheries and Aquatic Sciences, 54: 415–420Caswell, H. 1989. Matrix population models: construction, analysis and interpretation. Sinauer, Sunderland, MassachusettsGoodyear, C. P. 1995. Red snapper stocks in U.S. waters of the Gulf of Mexico. National MarineFisheries Service, Southeast Fisheries Centre, Miami Laboratory, CRD 95/96-05, Miami, FL, 125 ppKrebs, C. J. 1985. Ecology: the experimental analysis of distribution and abundance, 3rd ed. Harper and Row, New YorkSimpfendorfer, C. A. 1999. Demographic analysis of the dusky shark fishery in Southwestern Australia, p. 149-160. In: Life in the slow lane. Ecology and conservation of long-lived marine animals.J. A. Musick (ed.). American Fisheries Society Symposium 23, Bethesda, Maryland
Lleonart, J., Salat J (1997) VIT: Software for fishery analysis. User's manual. FAO Computerized Information Series (Fisheries), 11, Rome, FAO. 105 pp.
Needle C. L. (2003) - Survey-based assessments with SURBA. Working Document to the ICES
__________________________
SCSA Assessment Forms
Abel Abella A., Serena F., Ria M., 2005. Distributional response to variations in abundance over spatial and temporal scales for juveniles of European hake (Merluccius merluccius) in the Western Mediterranean Sea. Fisheries Research, 71: 295–310.
Abella A.J., Serena F., 1998. Selettività e vulnerabilità del nasello nella pesca a strascico. Biol. Mar. Medit., 5 (2): 496-504.
Bartolino V., Colloca F., Sartor P., Ardizzone G., 2008b. Modelling recruitment dynamics of hake, Merluccius merluccius, in the central Mediterranean in relation to key environmental variables. Fisheries Research, 92: 277-288.
Bartolino V., Ottavi A., Colloca F., Ardizzone G.D., Stefánsson G. 2008a. Bathymetric preferences of juvenile European hake (Merluccius merluccius). ICES J. Mar. Sci. 65: 963-969.
Belcari P., Ligas A., Viva C., 2006. Age determination and growth of juveniles of the European hake, Merluccius merluccius (L., 1758), in the northern Tyrrhenian Sea (NW Mediterranean). Fisheries Research., 78: 211-217
Biagi F., Cesarini A., Sbrana M., Viva C., 1995. Reproductive biology and fecundity of Merluccius merluccius (Linnaeus, 1758) in the Northern Tyrrhenian Sea. Rapp. Comm. int. Mer Médit., 34: 23.
Carpentieri P., Colloca F., Ardizzone G.D., 2008. Daily ration and feeding activity of juvenile hake in the central Mediterranean Sea. J. Mar. Biol. Ass. U.K., 88 (7): 1493-1501.
Carpentieri P., Colloca F., Cardinale M., Belluscio A., Ardizzone G.D., 2005. Feeding habits of European hake (Merluccius merluccius) in the central Mediterranean Sea. Fisheries Bulletin US, 103 (2): 411-416.
Colloca F., Belluscio A., Ardizzone G.D., 2000. Sforzo di pesca, catture e gestione dello stock di nasello (Merluccius merluccius) in un’area del Tirreno centrale. Biol. Mar. Med 7(1): 117-129.
Colloca F., Carpentieri P., Balestri E., Ardizzone G.D., 2004. A critical habitat for Mediterranean fish resources: shelf-break areas with Leptometra phalangium (Echinodermata: Crinoidea). Marine Biology, 145: 1129-1142.
Colloca, F., V. Bartolino, G. Jona Lasinio L. Maiorano, P. Sartor and G. Ardizzone.- 2009. Identifying fish nurseries using density and persistence measures. Mar Ecol Prog Ser. 381: 287–296
De Ranieri S., Belcari P., Bertolini D., Biagi F., Chiericoni V., Cognetti A.G., Mori M., Nannini N., Reale B., Rocca V., Sartor P., Sbrana M., 1997. Reclutamento di alcune specie ittiche demersali nel Mar Tirreno Settentrionale. Biol. Mar. Medit., 4(1): 237-243.
Nannini N., Pinna D., Chiericoni V., Biagi F., Belcari P., 2001. Ciclo ovarico di Merluccius merluccius (Linnaeus, 1758) nel mar Tirreno settentrionale. Biol. Mar Medit., 8 (1): 745-748.
Orsi Relini L., Capparena M., Fiorentini F., 1989. Spatial–temporal distribution and growth of Merluccius merluccius recruits in the Ligurian Sea. Observations on the 0-group. Cybium 13: 263–270.
Orsi Relini L., Papaconstantinou C., Jukic-Peladic S., Souplet A., Gil de Sola L., Piccinetti C., Kavadas S., Rossi M., 2002. Distribution of the Mediterranean hake populations (Merluccius merluccius smiridus Rafinesque, 1810) (Osteichthyes: Gadiforems) based on six years monitoring by trawl surveys: some implications for management. Sci. Mar. 66 (Suppl.2): 21-38.
Reale B., Sbrana M., De Ranieri S., 1995. Population dynamics of Merluccius merluccius exploited by two different trawl-nets in the Northern Tyrrhenian Sea. Rapp. Comm. int. Mer Médit., 34: 254.
Sartor P., Carlini F., De Ranieri S., 2003a. Diet of young european hake (Merluccius merluccius) in the northern Tyrrhenian Sea. Biol. Mar. Medit. 10 (2): 904-908.
Sartor P., Sartini M., Reale B., Sbrana M., 2001b. Analysis of the discard practices in the Merluccius merluccius (l., 1758) bottom trawl fishery of the Northern Tyrrhenian Sea. Biol. Mar. Medit. 8(1): 771-774.
Sartor, P., Recasens L., Viva C., Lleonart J., 2001a. Analysis of the impact of the fishery on the adult population of European hake in the Northwestern Mediterranean. Rapp. Comm. Int. Mer Médit., 36: 321-322.
__________________________
SCSA Assessment Forms
Sheet B
Biology of the species
Code: GME0910A.A
Units*
Fem Mal Both Unsexed
vonBertalanffy
64
0,15
0
0,0025
3,02
01:01
0,2
2000
Size at first maturity
Parameters used (state units and information sources)
Recruitment size
Somatic magnitude measured (LH, LC, etc)* TL
Reproduction areas
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
Maximum size observed
t0 (growth)
yes 150-200mNursery areas
Reproduction season
cm
length-weight relationship
a (length-weight)
b (length-weight)
Assessment form
L∞ (growth)
K (growth)
Biology
Data source
Sex
Growth model
Comments
Sex
M
yes
sex ratio
__________________________
SCSA Assessment Forms
4000
Sheet B (page 2)Comments
__________________________
SCSA Assessment Forms
Sheet P1
General information about the fishery
Code: GME0910A.A
0
tons
10
Operational Units*
Catch
(species
assessed)
Operational
Unit 1*
Operational
Unit 2
Operational
Unit 3
Operational
Unit 4
Operational
Unit 5
Comments
09
09ITA
ITA
ITA
Total
Fleet
(n° of
boats)*
ITA 09 E 03 33 - GME
10
Comments
Legal minimum size
Sheet P1 (page 2)
1996-2010
Other species
caught
Discards
(species
assessed)
Discards
(other species
caught)
GME
Group of Target
SpeciesSpecies
GME
Effort
units
Assessment form
09
Monthly
Country
Year (s)*
Fleet and catches (please state units)
09
Fishing Gear Class
GME
GME
GME
03 - Trawls33 - Demersal shelf
speciesE - Trawl (12-24 metres)
Kilos or
Tons
Data source* EC Data Collection Regulation
ITA 09
Data aggregation (by year, average
figures between years, etc.)*
ITA
Fleet Segment
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
GSA
The blackmouth catshark Galeus melastomus is a deep sea species, mainly distributed in the
depth range 200-1000m. Locally, the species has a quite low commercial value. The species is
exclusively caught with bottom trawl nets, mainly as a by-catch of the Norway lobster fishery, by
vessels operating within the 250-500m depth range and in red shrimps fisheries in deeper waters
(up to 800m). Only relatively big-sized individuals are landed.
Other involved species of the Nephrops and Red shrimps fisheries are Phycis blennoides,
Micromesistius potassou, Lepidopus caudatus, Trachurus trachurus, Conger conger,
Macrouridae, Etmopterus spinax, Gadiculus argenteus, Parapenaeus longirostris.
__________________________
SCSA Assessment Forms
Comments
Tab. 7.4.1 - Technical characteristics of the trawl fleet of GSA9 (DCR official data)Year 2004 2005 2006N. of boats 344 358 361GT 12.818 12.961 13.191kW 74.017 74.606 75.514Mean GT 37.3 36.2 36.5Mean kW 215.2 208.4 209.2
__________________________
SCSA Assessment Forms
Sheet P2a
Fishery by Operational Unit
Code: GME0910A.A
#REF!
Data source* OpUnit 1*
Year* 2004 2005 2006 2007 2008 2009
Catch
Minimum size
Average size Lc
Maximum size
Fleet 344 358 361
Year 2010
Catch
Minimum size
Average size Lc
Maximum size
Fleet
200
L25
L50
L75
Selection factor
Time series
Structure by size or age
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
catch assessment survey EU-(DCF)
Selectivity Remarks
Assessment form
__________________________
SCSA Assessment Forms
Structure by size or age
#REF!
CATCH STRUCTURE
0
5000
10000
15000
20000
25000
30000
35000
1 6 11 16 21 26 31 36 41 46 51
Size (cm)
N
__________________________
SCSA Assessment Forms
Sheet P2b
Fishery by Operational Unit
Code: GME0910A.A
####
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
Assessment form
official data
Accompanying species
Data source*
Regulations in force and degree of observance of regulations
OpUnit 1*
#REF!
__________________________
SCSA Assessment Forms
__________________________
SCSA Assessment Forms
Sheet P2b
Fishery by Operational Unit
Code: GME0910A.A
####
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
Assessment form
Regulations in force and degree of observance of regulations
OpUnit 2* #REF!
Accompanying species
Data source*
Fishing closure for trawling: 30 days in late summer (only enforced some years)Minimum landing sizes: EC regulation 1967/2006: 20 cm TL for hake.Cod end mesh size of trawl nets: 40 mm (stretched, diamond meshes) till 30/05/2010. From 1/6/2010 the existing nets will be replaced with a cod end with 40 mm (stretched) square meshes or a cod end with 50 mm (stretched) diamond meshes. Towed gears are not allowed within three nautical miles from the coast or at depths less than 50 m when this depth is reached at a distance less than 3 miles from the coast. Two small No Take Zones (“Zone di Tutela Biologica”, ZTB) are present inside the GSA9; one off the Giglio Island (50 km2, northern Tyrrhenian Sea) another off Gaeta, (125 km2, central Tyrrhenian Sea). In both areas fishing gears operating on the bottom are not allowed six months per year.
Hake trawl fishery exploits a highly diversified species assemblage: deep sea pink shrimp (Parapenaeus longirostris) horned octopus (Eledone cirrhosa), poor cod (Trisopterus minutus capelanus), squids (Illex coindetii), are among the most important species in the by catch.
__________________________
SCSA Assessment Forms
Sheet P2b
Fishery by Operational Unit
Code: GME0910A.A
####
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
Assessment form
Regulations in force and degree of observance of regulations
OpUnit 3* #REF!
Accompanying species
Data source*
Fishing closure for trawling: 30 days in late summer (only enforced some years)Minimum landing sizes: EC regulation 1967/2006: 20 cm TL for hake.Cod end mesh size of trawl nets: 40 mm (stretched, diamond meshes) till 30/05/2010. From 1/6/2010 the existing nets will be replaced with a cod end with 40 mm (stretched) square meshes or a cod end with 50 mm (stretched) diamond meshes. Towed gears are not allowed within three nautical miles from the coast or at depths less than 50 m when this depth is reached at a distance less than 3 miles from the coast. Two small No Take Zones (“Zone di Tutela Biologica”, ZTB) are present inside the GSA9; one off the Giglio Island (50 km2, northern Tyrrhenian Sea) another off Gaeta, (125 km2, central Tyrrhenian Sea). In both areas fishing gears operating on the bottom are not allowed six months per year.
Hake trawl fishery exploits a highly diversified species assemblage: deep sea pink shrimp (Parapenaeus longirostris) horned octopus (Eledone cirrhosa), poor cod (Trisopterus minutus capelanus), squids (Illex coindetii), are among the most important species in the by catch.
__________________________
SCSA Assessment Forms
Sheet A1
Indirect methods: VPA, LCA
Code: GME0910A.A
Sex* both #REF!
Size Age
x
F1
F2
Z
1500
(mark with X)
Cohorts
x
Turnover
Virgin population
Assessment form
Total
Data
0,4
Average population
Maximum
Average
Software
Amount
LCA
Biomass
Equation used
PseudocohortsModel
(mark with X)
Critical
Average mortality
Analysis # *
Recruitment
Tunig method
Population results (please state units)
Sizes
# of gears
Minimum
0,35
Gear
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
Fterminal
1
1
Ages
Time series
Comments
(F1 and F2 represent different possible calculations. Please state them)
__________________________
SCSA Assessment Forms
Sheet A2
Indirect methods: data
Code: GME0910A.A
Sex* both Gear*
Data
source
age 2005 2006 2007 2008 2009 2010 F at age
1 1,3 0,67 0,68 1,54 1,66 0,43
2 2,07 1,88 2,41 1,95 1,71 2,21
3 1,61 5,26 1,87 1,33 1,19 1,65
4 1,96 3,66 1,76 1,75 1,7 2,13
5+ 1,96 3,66 1,76 1,75 1,7 2,13Fbar2-4 1,88 3,6 2,02 1,67 1,53 2Fbar1-2 1,69 1,27 1,55 1,74 1,69 1,32
Fig.
Total catches (number of specimens)
1
Assessment form
Data
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
bottm trawl=gear 1; gillnet=gear 2 Analysis # *
Summary of stock parameters (recruitment, SSB, Catch and landing, F mean for ages 2-4) as estimated by XSA.
Input datasize N size N
0 28 3543
1 0 29 1984
2 0 30 1503
3 0 31 1486
4 0 32 1773
5 0 33 1521
6 0 34 1032
7 0 35 474
8 0 36 531
9 0 37 535
10 1804 38 425
11 2794 39 326
12 4949 40 480
13 7094 41 992
14 10627 42 1420
15 15112 43 2274
16 20745 44 2717
17 27173 45 3268
18 30765 46 2918
19 29136 47 2727
20 24304 48 2022
21 20554 49 1655
22 17070 50 1210
23 12675 51 1108
24 9583 52 996
25 7369 53 690
26 7068 54 621
27 4622 55 234
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SCSA Assessment Forms
Sheet A3
Indirect methods: VPA results
Code: GME0910A.A
#REF!
Sex* both Gear*
Assessment form
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
bottom trawl Analysis #*
Fishing mortality rates
Population in figures
LCA
Population in biomass
Prop mature B year SSB year total F year ind W year N C OTB land C OTB discF OTB landedF OTB disc
age
0 0.0 1124651 0 0 0.2 4057932 0 0 0.00 0.00
1 0.0 16327918 0 0.094668749 4.5 3811847 0 42381 0.00 0.09
2 0.0 34395926 0 0.669124446 18.2 1980318 0 169748 0.00 0.67
3 0.0 26989128 0 0.394147657 41.8 657818 0 41316 0.00 0.39
4 0.0 30841478 0 0.127478777 75.0 429485 0 10290 0.00 0.13
5 0.0 28206394 0 0.263408346 115.1 256902 1720 1838 0.13 0.14
6 0.9 30769074 0 0.035118687 159 201208 1274.02095 492 0.03 0.01
7 1.0 23228457 23228457 0.147909471 200 116771 4685.24105 0 0.15 0.00
8 1.0 18899539 18899539 0.40216856 246.5 77459.5 8902.46768 0 0.40 0.00
9 1.0 8338661 8338661 0.518934563 189 28926.3 4748.80272 0 0.52 0.00
10 1.0 5366028 5366028 0.496056803 327 16438.4 2864.88511 0 0.50 0.00
11 1.0 3182328 3182328 0.69024561 370 8657.51 2104 0 0.69 0.00
12 1.0 874218.3 874218.3 0.874338224 400 2169.54 690 0 0.87 0.00
13 1.0 529530.2 529530.2 0.5 430 1242 621 0 0.50 0.00
14 1.0 445 0 0 0 0.00
15 1.0 485 0 0 0 0.00
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SCSA Assessment Forms
Sheet Y
Indirect methods: Y/R
Code: GME0910A.ASex both
F40%SSB
Fref
0,18
Current YR
Maximum Y/R
Total
0,13
Y/R 0.1
Gear
Comments
Fmax
F0.1
B/R 0.1
Current B/R
Maximum B/R
Vector M
Vector N
Parameters used
yes
# of gears 2 Software
Vector F
Yield
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
Assessment form
Y/RAnalysis #
0,1
Model characteristics
Results
__________________________
SCSA Assessment Forms
Comments
Sheet Y (page 2)
__________________________
SCSA Assessment Forms
Sheet other
Code: GME0910A.A
#REF!
1998
Other assessment methods
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
Assessment form
does not exist. As a complementary it was performed analysis a demographic model that rely primarily on life historyparameters. Such analysis is expected to provide some useful information for management.
The Leslie Matrix was adapted to include information on fishing mortality at specific ages, or changes in thereproductive schedule. In order to assess how much influence the changes in the used estimates of the vital ratesfecundity at age and mortality rates have on the population growth rate, the software allows the performance ofsensitivity analyses. In this case, such sensitivity analysis is reported as the elasticity, which is the proportional(relative) change of sensitivity. This choice facilitates the comparisons related to the consequences (impact on theestimates of population growth rate) of small changes in fecundity and on the mortality rates, which are obviouslyexpressed in different absolute scales. Elasticity is calculated from the elements of the transition matrix , the
population growth rate ( r) and the elements of the right and left eigenvectors. While the Leslie matrix was modified
for allowing the inclusion of fishing mortality rates and changes in age of first capture, this allowed the estimation
of the values of the rate of population growth rm
obtained with different combinations of age of first capture Lc
and fishing mortality rate F. In the figure, the green area represents combinations that define a positive value for
rm
. An Fc=0.08 was defined as threshold for the current exploitation pattern.
The use of the elasticity analysis made possible to estimate how much vulnerable to changes in the
survival of the juveniles (or the adults) depending on the characteristics of the species in question
(small or large, slow or fast-growing, long or short-lived species. The results, that allowed a
comparison among the consequences (sensitivity) to small changes in fecundity and on the mortality
rates, derive from standardized information, considering that data are originally expressed in different
absolute scales.
Isoplets of the rate of population growth rm
obtained with different combinations of age of first capture Lc
and fishing mortality rate F. The green area represents combinations that define a positive value for rm
.
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SCSA Assessment Forms
Sheet D
Diagnosis
Code: GME0910A.A
FALSE
FALSE
FALSE FALSE FALSE
FALSE FALSE
TRUE TRUE
FALSE
Uncertain / Not assessed
Bid
ime
ns
ion
al
Virgin or high abundance
Intermediate abundance
Stock abundance
Uncertain / Not
assessed
FALSE
Use one (or both) of the following two systems for the stock assessment status description
? - (or blank) Not known or uncertain. Not much information is available to make a judgment;
Exploitation rate
No or low fishing
Moderate fishing
High fishing mortality
FALSE
FALSE
M - Moderately exploited, exploited with a low level of fishing effort. Believed to have some limited
potential for expansion in total production;
F - Fully exploited. The fishery is operating at or close to an optimal yield level, with no expected room for
further expansion;
Low abundance
Depleted
R - Recovering. Catches are again increasing after having been depleted or a collapse from a previous;
Reference
Point
F30%SSBo
Fmax
Y
Current
value
B
CommentsTrendUnits
F
CPUE
Criterion
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
Reference points
Assessment form
SSB
Un
idim
en
sio
na
l
TRUE
FALSE
F0.1
ZMBP
Stock Status*
FALSE
U - Underexploited, undeveloped or new fishery. Believed to have a significant potential for expansion in
total production;
O - Overexploited. The fishery is being exploited at above a level which is believed to be sustainable in the
long term, with no potential room for further expansion and a higher risk of stock depletion/collapse;
D - Depleted. Catches are well below historical levels, irrespective of the amount of fishing effort exerted;
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SCSA Assessment Forms
3996
Sheet D (page 2)
Comments
__________________________
SCSA Assessment Forms
Sheet Z
Objectives and recommendations
Code: GME0910A.A
3415The species
4000
Management advice and recommendations*
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
Assessment form
Advice for scientific research*
The species is considered overexploited, with consistent diagnosis of the current exploitation status obtained with the 2 used approaches aimed at the definition of precautionary Reference Points (Fc = 0.08 and F 0.1=0.13) which values are much lower than the current estimate of fishing mortality rate of F=0.35. The size of first capture is too low (growth overfishing) and an increase in yield and a more safe situation for the stock as regards the possibility of self-renewal can be expected in the case a reduction of fishing effort do occur and/or more selective gears are used
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SCSA Assessment Forms
__________________________
SCSA Assessment Forms
Sheet C
Comments
Code: GME0910A.A
#REF!
3821Most of the
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
Assessment form
Comments*
Most of the assessments have been performed during the Working groups organized by the Scientific Technical and Economic Commission of Fisheries (STECF) of the European Comunity.
__________________________
SCSA Assessment Forms
Year 1
Source: -
Source: -
Source: -
803
The
black
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
2010A.Abella4, F. Colloca1, P. Sartor2, A. Ligas2, , M.
Sbrana2, A.Mannini3,
Fisheries (brief description of the fishery)*
Authors
Species Scientific name Galeus melastomus- GME
Abstract for SCSA reporting
Geographical Sub-Area 09 - Ligurian and North Tirrenian Sea
The blackmouth catshark Galeus melastomus is a deep sea species, mainly distributed in the depth range 200-1000m. Locally, the species has a quite low commercial value. The species is exclusively caught with bottom trawl nets, mainly as a by-catch of the Norway lobster fishery, by vessels operating within the 250-500m depth range and in red shrimps fisheries in deeper waters (up to 800m). Only relatively big-sized individuals are landed. Other involved species of the Nephrops and Red shrimps fisheries are Phycis blennoides, Micromesistius potassou, Lepidopus caudatus, Trachurus trachurus, Conger conger, Macrouridae, Etmopterus spinax, Gadiculus argenteus, Parapenaeus longirostris.
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SCSA Assessment Forms
-6A
LCA
O - Overexploited. The fishery is being exploited at above a level which is believed to be sustainable in the long
term, with no potential room for further expansion and a higher risk of stock depletion/collapse;
Low abundance
Exploitation rate Stock abundance
Stock Status*
Source of management advice*
Comments
High fishing mortality
(brief description of material -data- and methods used for the assessment)
A LCA was performed aimed at the estimation of a vector of F-at-size, using data on total annual catches by size for the year 2010, including discards. Considering the availability of only one year of data, it was not possible to perform a formal VPA. The size distribution of the catch for the year 2010 was hence used assuming to be representative of an equilibrium status.
The Y/R analysis allowed to estimate the expected relative yields and surviving fraction of the parental biomass at different mortality rates and to produce an estimate of F0.1 which can be considered a proxy of FMSY.The age-based Yield per Recruit (YPR) routine, included in the stock assessment toolbox of NOAA was used. It is based on the Thompson-Bell model for estimating the expected lifetime yield and biomass from a cohort subjected to varying levels of fishing mortality.
A demographic analysis was used for the definition of the status of the stock regarding its capacity of self-renewal (Caswell, 1989).A Leslie Matrix was adapted to include information on fishing mortality at specific ages, or changes in the reproductive schedule. Elasticity analysis allowed identifying the ages at which smallest changes in vital rates can produce biggest changes in the population growth rate. Elasticity analysis allows defining the management choices likely to produce more benefits to the stock, by estimating how much vulnerable is the species to changes in the survival of the juveniles (or for the adults)
__________________________
SCSA Assessment Forms
1Management advice and recommendations*
The species is considered overexploited, with consistent diagnosis of the current exploitation status obtained with the 2
used approaches aimed at the definition of precautionary Reference Points (Fc = 0.08 and F 0.1=0.13) which values
are much lower than the current estimate of fishing mortality rate of F=0.35. The size of first capture is too low (growth
overfishing) and an increase in yield and a more safe situation for the stock as regards the possibility of self-renewal can
be expected in the case a reduction of fishing effort do occur and/or more selective gears are used
__________________________
SCSA Assessment Forms
0Advice for scientific research*
__________________________
SCSA Assessment Forms
Advice for scientific research:
Assessment of Blackmouth catshark (Galeus melastomus- GME) from 09 - Ligurian and North
Tirrenian Sea. A.Abella4, F. Colloca1, P. Sartor2, A. Ligas2, , M. Sbrana2, A.Mannini3,
Source of management advice: A LCA was performed aimed at the estimation of a vector of F-at-size,
using data on total annual catches by size for the year 2010, including discards. Considering the
availability of only one year of data, it was not possible to perform a formal VPA. The size distribution
of the catch for the year 2010 was hence used assuming to be representative of an equilibrium status.
The Y/R analysis allowed to estimate the expected relative yields and surviving fraction of the parental
biomass at different mortality rates and to produce an estimate of F0.1 which can be considered a proxy
of FMSY.
The age-based Yield per Recruit (YPR) routine, included in the stock assessment toolbox of NOAA was
used. It is based on the Thompson-Bell model for estimating the expected lifetime yield and biomass
from a cohort subjected to varying levels of fishing mortality.
Stock abundance: Low abundance
SAC GFCM - Sub-Committee on Stock Assessment (SCSA)
Exploitation rate: High fishing mortality
Comments:
Description of fishery: The blackmouth catshark Galeus melastomus is a deep sea species, mainly
distributed in the depth range 200-1000m. Locally, the species has a quite low commercial value. The
species is exclusively caught with bottom trawl nets, mainly as a by-catch of the Norway lobster fishery,
by vessels operating within the 250-500m depth range and in red shrimps fisheries in deeper waters (up
to 800m). Only relatively big-sized individuals are landed.
Other involved species of the Nephrops and Red shrimps fisheries are Phycis blennoides,
Micromesistius potassou, Lepidopus caudatus, Trachurus trachurus, Conger conger, Macrouridae,
Etmopterus spinax, Gadiculus argenteus, Parapenaeus longirostris.
Management advice and recommendation: The species is considered overexploited, with consistent
diagnosis of the current exploitation status obtained with the 2 used approaches aimed at the definition of
precautionary Reference Points (Fc = 0.08 and F 0.1=0.13) which values are much lower than the
current estimate of fishing mortality rate of F=0.35. The size of first capture is too low (growth
overfishing) and an increase in yield and a more safe situation for the stock as regards the possibility of
self-renewal can be expected in the case a reduction of fishing effort do occur and/or more selective
gears are used
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SCSA Assessment Forms
Advice for scientific research:
__________________________
SCSA Assessment Forms
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