SCSA Assessment Forms...Bartolino V., Colloca F., Sartor P., Ardizzone G., 2008b. Modelling recruitment dynamics Modelling recruitment dynamics of hake, Merluccius merluccius, in the

GENERAL FISHERIES COMMISSION FOR

THE MEDITERRANEAN

COMMISSION GÉNÉRALE DES PÊCHES

POUR LA MÉDITERRANÉE

SCSA Assessment Forms

SAC GFCM

Sub-Committee on Stock Assessment

> Enter <

__________________________


Constantina Karlou-Riga

SAC GFCM


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

__________________________


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SAC GFCM - Sub-Committee on Stock Assessment (SCSA)

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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


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.

__________________________


C Comments At the option of the person in charge. Unspecified If available

__________________________


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


Species Scientific name*

18 October 2010Date*

Galeus melastomus- GME

MONTH

Code*

Combination of GSAs

Authors*

Geographical area*

Affiliation*

GME0910A.A

__________________________


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


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

__________________________


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.

__________________________


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


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

__________________________


4000

Sheet B (page 2)Comments

__________________________


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


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.

__________________________


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

__________________________


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


catch assessment survey EU-(DCF)

Selectivity Remarks

Assessment form

__________________________


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

__________________________


Sheet P2b


Code: GME0910A.A

####


Assessment form

official data

Accompanying species

Data source*

Regulations in force and degree of observance of regulations

OpUnit 1*

#REF!

__________________________


__________________________


Sheet P2b


Code: GME0910A.A

####


Assessment form


OpUnit 2* #REF!


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.

__________________________


Sheet P2b


Code: GME0910A.A

####


Assessment form


OpUnit 3* #REF!


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.

__________________________


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


Fterminal

1

1

Ages

Time series

Comments

(F1 and F2 represent different possible calculations. Please state them)

__________________________


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


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

__________________________


Sheet A3

Indirect methods: VPA results

Code: GME0910A.A

#REF!

Sex* both Gear*

Assessment form


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

__________________________


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


Assessment form

Y/RAnalysis #

0,1

Model characteristics

Results

__________________________


Comments

Sheet Y (page 2)

__________________________


Sheet other

Code: GME0910A.A

#REF!

1998

Other assessment methods


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

.

__________________________


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


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;

__________________________


3996

Sheet D (page 2)

Comments

__________________________


Sheet Z

Objectives and recommendations

Code: GME0910A.A

3415The species

4000

Management advice and recommendations*


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

__________________________


__________________________


Sheet C

Comments

Code: GME0910A.A

#REF!

3821Most of the


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.

__________________________


Year 1

Source: -

Source: -

Source: -

803

The

black


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.

__________________________


-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)

__________________________


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

__________________________


0Advice for scientific research*

__________________________


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


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

__________________________


Advice for scientific research:

__________________________


Documents

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