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An introduction of Stock Enhancement in Kanagawa, Japan. Provincial Court, Bruges , Belgium 7-8 May ,2007. Toshitame IMAI Kanagawa Prefectural Fisheries Technology Center Yoroshi, Jogashima, Misaki, Miura Kanagawa 238-0237, Japan - PowerPoint PPT Presentation
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An introduction of Stock Enhancement in Kanagawa, Japan
Provincial Court, Bruges , Belgium 7-8 May ,2007
Toshitame IMAI
Kanagawa Prefectural Fisheries Technology CenterYoroshi, Jogashima, Misaki, Miura
Kanagawa 238-0237, JapanEmail: [email protected]
A location of Kanagawa
Catch
Pleasure16%
Fishery84%
Total landing of fisheries
0% 20% 40% 60% 80% 100%
Sillagonoid
Squid
Amberjack
Frigate mackerl
Sweetlip
Fish glue
Scomber
Flat fish
PleasureFishery
Ratio of each fish species in total landing
Landings of commercial and sports fishing in Kanagawa
Brief History of Stock Enhancement Activities in Kanagawa Prefecture
1966 Establishment of R/D facility of hatchery technology1967 R/D of live feed culture & larviculture1974 ~ Fundamental studies on fishery biology of the red sea bream,
the Japanese flounder, and abalone 1975 Development of the technologies on mass production of live
feed and a mechanical bottom cleaner1976 The 1st hatchery for stock enhancement1975- R/D of large scale larviculture technologies 1977 ( Rotifer fortification examination, water tank bottom vacuum cleaner device development)1978 ~ Large scale restocking activity of red sea bream using 1million
hatchery-raised juveniles, tagged 10% juveniles1986 Tag and recapture experiment on hatchery-raised red sea
bream juveniles
1984 Enforcement of the 1st basic plan for stock enhancement ( The 5th plan, 2006) 1987 A pilot proof examination (recovery ratio, cost- effectiveness, benefit principle ratio)1989 An association of Kanagawa Fish Farming Foundation established1990 Investigation of measures on the management of stock enhancement of marine resources ( setting an closed fishing area, season, releasing a small fish)1990 Construction of the 2nd hatchery for stock enhancement
2000 Introducing a benefit principle system
Brief History of Stock Enhancement Activities in Kanagawa Prefecture, contn’d
A promotion system of sea farming
Board of director
Secretariat
Management sec.
Operation sec.
CaputInspector
Support
City Town
Assoc.
Kanagawa
Fish
farming
Found.
Kanagawa
Pref.
Fish.
Tec.
Center
Coop.
Play fishing
Boat
supplier
Fishermen
Angler Support
Member.
Organization of Fish farming found
An aerial photograph of Kanagawa Prefectural Fisheries Technology Center
Cultivation Tank of Rotifer and Green Water
Rearing Tank and Drain Cage, Bottom Cleaner
Development of Red Sea bream
Releasing Hatchery Raised Red Sea Bream
A Sports Fishing Boat of Red Sea Bream in Tokyo Bay
Landing sight on Fish market
Measurement of red sea bream
Target species of stock enhancement in Kanagawa Prefecture
2002 2001J apanese nameEnglish name Scientific name Produced Released
(ton) × 1000クロアワビ Disk abalone Haliotis discus discus 2 144マダカアワビ Giant abalone H.madaka 5 149メガイアワビ Giant abalone H.gigantia 10 202トコブシ J apanese abalone H. diversicolor 5.9 0サザエ Spiny top shell Batillus cornatus 173 739マダイ Red sea bream Pagurus major 33 1006ヒラメ J apanese flounder Paralichthys olivaceus 56 535ホシガレイ Spotted halibut Veasper variegatus 0 15マコガレイ Mud dab Limanda yokohmae 46 229
クルマエビ Kuruma prawn Penaeus japonicus 1.8 90ガザミ Swimming crab Portunus trituberculatus 4.4 5カサゴ Scorpion fish Sebasticus mormoratus - 62
Red: Association production Yellow: purchase from outside
Black: Technology Center production
Blue: Discontinue
Annual changes of stocking number
0
200000
400000
600000
800000
1000000
1200000
1400000
Red sea breamBl ack sea breamFl ounderAbal oneTop shel lSwi mmi ng crabKuruma Prown
Recapture rate of stock enhancement
J apanese nameEnglish name Scientific name Recovery rate(%)
クロアワビ Disk abalone Haliotis discus 3 7~マダカアワビ Giant abalone H.madaka 5 12~メガイアワビ Giant abalone H.gigantia 6 10~トコブシ J apanese abalone H. diversicolor 15 20~サザエ Spiny top shell Batillus cornatus 30 35~マダイ Red sea bream Pagurus major 4 12~ヒラメ J apanese flounder Paralichthys olivaceus 3 10~ホシガレイ Spotted halibut Veasper variegatus -
Cost-effectiveness
: mi l l i on yenEngl i sh name Expense Catch Pl ay fi shi ng Cost-
amount money amount money eff ecti venessA B C B+C/ A
Red Sea Bream 32 19 64 2. 6Fl atfi sh 12 34 2. 8Abal one 25 147 5. 9Top shel l 14 46 3. 3 But we remove personal expenses, the i nsti tuti on repayment coast
種苗放流数と捕獲量
0
20
40
60
80
100
120
140
0
20
40
60
80
100
120
140
Sport(ton) Commercial(ton) Released seed
‘‘57 ‘66 ’78 ‘00
The catch by commercial and sports fishermen and the number of released juveniles of red sea
bream in Kanagawa Prefecture.
A ratio of hatchery-raised fish and wild fish in landing
10平成 年度天然魚・放流魚比率
放流魚(47 )千尾
37%
天然魚(79 )千尾
63%
捕獲尾数126千尾
Hatchery
wild
Thousand indi.
Development of a tagging method for a fry
• We attached an anchor tag to red sea bream fry with length 6-8cm since 1978 to 1989 and released 1,000,000 of them in total.
• The recapture rate was 1%.
• Movement, growth became clear by anchor tag planting of fish.
• However, a calculation of a recovery was not possible by falling off of a tag, and lacking of a recapture report.
Development of a marking method for a fry
• Furthermore, we developed a new technology using ALC as a mark to a fry, and to dye a scale. A method to make a mark in alizalin complexone stained an otolith conventionally
Optical microscope
Fluorescent microscope
The deformity of inter-nostril epidermis as a mark of hatchery-raised fish
A contribution breakdown of an endowment
Kanagawa Pref ecture
Associ at i on of fi shermen' scooperat i ve associ at i onsoci et y
A fi shermen' s cooperat i veassoci at i on
Ci t y
A fi shery group
An associ at i on
A sum of an endowment
761,170 thousand yen
A change of an income breakdown of Association of Kanagawa fish farming Foundation
0
50000
100000
150000
200000
250000A f ee
A busi ness
Money ofcooperat i on
Money of burden
A subsi de
Endowment use
An i ncome
Thousand yen
The ratio of seeds production capital before and after inducing cooperate money from the red sea
bream fishing angler
1573000
9853000
20674000
Before After
12384634000000
80000004272000
4772605
7007075
Endowment
Subsi de
Fi shermen
Party boat
Angl er
Profi tbusi ness
20674000
After
Total \29,290,143Total \32,100,000
19992005
Development of Zostera bed
• Shallow waters of Tokyo Bay had very large eelgrass ground until 1960’s.
• However, reclaim advanced for high economic growth after 1960’s, and shallow waters level lost it.
• As a result, the seat which larvae of fishery products brought up disappeared, and quantity of fishery decreased sharply.
• Therefore we perform a trial to restore eelgrass ground
The genetic selection of stocks used for restocking purposes
• In addition ,we pay it around 20% for the parent in every year and perform a substitute
• We coast the number of parent fish more than 500 of them to keep genetic variety
• We monitor mt-DNA and microsatellite DNA about a gene of a released fish and a fishery fish now.
Hap
rotyp
e com
po
sition
•Thank you very much for your kind attention