Size selectivity of gill net for female snow crab, Chionoecetes opilio

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1 J Kor Soc Fish Tech 45(2) DOI:13796/KSFT Size selectivity of gill net for female snow crab Chionoecetes opilio Chang-Doo PARK* Heui-Chun AN 1 Sam-Kwang CHO Bong-Seong BAE 2 Hae-Hoon PARK 2 Jae-Hyun BAE 1 and Hyun-Young KIM Fisheries Resources Division West Sea Fisheries Institute NFRDI Incheon 4-42 Korea 1 Fisheries Engineering Division National Fisheries Research & Development Institute Busan Korea 2 Fisheries Resources Division East Sea Fisheries Institute NFRDI Gangwon-do Korea A series of fishing experiments was carried out in the eastern coastal waters of Korea from January 22 to March 23 using gill nets of different mesh sizes (m and 3 mm) to determine the size selectivity of gill net for female snow crab Chionoecetes opilio The catch of experimental gears was mostly snow crab (97%) Chionoecetes opilio The maximum carapace length (RL) of each female snow crab caught in the fishing experiments was measured The master selection curve was estimated by applying the extended Kitahara s method The selection curve showed that the gill nets of larger mesh size allowed more female crabs of small carapace size to escape The optimum values of RL/m for 1 of retention probability was 563 and RL/m was estimated to be and 367 when the retention probability were and 5 respectively Key words : Chionoecetes opilio Snow crab Gill net Selectivity Selection curve Kitahara s method (Snow crab Chionoecetes opilio) 5 6m 5 (Miyake 1983; Lim 21) *Corresponding author: Tel Fax

2 ( ) ( ) (Yamasaki 1994) (TAC ) (Yamasaki 1994; Xu and Millar 1993) (9cm ) ( 24mm 15mm ) 873% 116% (27 ) (Yamasaki 1994; Xu and Millar 1993; Conan and Comeau 1986) 15 4m (monofilament) 2 (1 3m) 8m 9 1m ( ) m(mm) 5 ( mm) d(mm) 4 (φ 331) 5 (φ 37) 6 (φ 45) 7 (φ 438) 8 (φ 468) (793 ) 99 (633 ) CW(mm) RL(mm) CL(mm) (chela) Ch(mm) 1mm (Park et al 23) (Jadamec et al 1999) ( ) CL RL (Park et al 23)

3 al(23) (BH 3959RL 62) Ishida (Ishida 1962) Holt (FAO 1992) Kitahara (Kitahara 1968) SELECT (Park et al 24 ; Millar and Walsh 1992) Master Curve Kitahara (Fujimori et al 1996; Cho et al 2; Park et al 23) 97% 2351 (567%) 1795 (433%) 8mm 15cm (chela) (Conan and Comeau 1986; Yamasaki 1994; Park et al 23) 8cm (Lim 21) (CW) N 561 CW(mm) RL(mm) CL(mm) BH(mm) CW 1771RL 299 (R ) RL 8998CW 512 (R ) CL 9345RL 561 (R ) RL 1334CL 85 (R ) CL 8517CW 171 (R 2 962) CW 11274CL 52 (R 2 962) BH 629RL 1438 (R ) Park et In Ch(mm) y R ln CW N 561 y R ln RL mm Fig 1 Relationship between the carapace size and the chela height in the natural logarithm for the female snow crab CW : carapace width RL : maximum carapace length (rostral horn) Ch : chela height

4 3 2 (RL) (Ch) Fig 1 Mesh size : 18mm N 71 (Ch) (RL) 5mm Fig mm 6 9mm Fig 2 (Park et al 23) ( mm 6 115mm ) Catch number Mesh size : 21m N 474 Mesh size : 24mm N ( 42m) 11 1 c mm (Fig 3) Mesh size : 27mm N 28 Mesh size : 3mm N Maximum carapace length RL(m) Fig 2 Maximum carapace length (RL) distributions of female snow crab caught in the experiment Catch number / net c 25388exp( 151m) (R ) c 25388exp 151m R Mesh size m(mm) Fig 3 Relationship between the mesh size (m) and the catch number per unit net of female snow crab (c) caught in the experiment

5 Kitahara (Kitahara 1968) (3 ) Master Fig 4 S(R) S(RL/m) exp{(44121r R R 5) 5868} (Fig 4) RL/m 1 1 RL/m 563 (Cho et al 2: Park et al 24) (Bell Type) Sigmoid (Fig 4) RL/m Park et al(23) 24mm mm mm (Jeong et al 29) 23) (Fujimori et al 1996; Park et al Retention probability RL(mm) RL/m Maximum carapace length / Mesh size Fig 4 Master selection curve of gill net for female snow crab mm CW RL BW 97% Kitahara

6 1 RL/m RL/m Park et al(23) ( RP 28 FE 5) Cho YB CD Park and JH Lee 2 A study on the selectivity of the mesh size in trammel net for Cynoglossidae Spp Bull Korean Soc Fish Tech 36(2) Conan GY and M Comeau 1986 Functional maturity and terminal molt of male snow crab Chionoecetes opilio Can J Fish Aquat Sci FAO 1992 Introduction to tropical fish stock assesment FAO Fisheries Technical Paper 36/ Fujimori Y T Tokai S Hiyama and K Matuda 1996 Selectivity and gear efficiency of trammel nets for kuruma prawn (Penaeus japonicus) Fisheries Research Ishida T 1962 On the gill net mesh selectivity curve Bull Hokkaido Reg Fish Res Lab Jadamec LS WE Donaldson and P Cullenberg 1999 Biological field techniques for Chionoecetes Crabs University of Alaska Sea Grant College Program pp Jeong EC HH Park BS Bae DS Chang CS Kim SH Choi and HK Cha 29 Size selectivity of gill net for male Japanese sandfish (Arctoscopus japonicus) off Gangwon in winter J Kor Fish Soc 42(1) Kitahara T 1968 Mesh selectivity curve of sweeping trammel net for branquillos Bulletin of the Japan Soc of Scientific Fisheries 34(9) Lim YS 21 Sexual maturation and larval growth of the snow crab Chionoecetes opilio Pukyong National University Doctoral Thesis pp Millar RB and SJ Walsh 1992 Analysis of trawl selectivity studies with an application to trouser trawls Fisheries Research Miyake S 1983 Japanese Crustacean Decapods and Stomatopods in Color Vol Hoikusha Tokyo pp Park CD HC An SK Cho and CI Baik 23 Size selectivity of gill net for male snow crab Chionoecetes opilio Bull Korean Soc Fish Tech 39(2) Park CD EC Jeong JK Shin HC An and Y Fujimori 24 Mesh selectivity of encircling gill net for gizzard shad Konosirus punctatus in the coastal sea of Korea Fish Sci Xu X and RB Millar 1993 Estimation of trap selectivity for male snow crab (Chionoecetes opilio) using the SELECT modeling approach with unequal sampling effort Can J Fish Aquat Sci 5(11) Yamasaki A 1994 Studies on stock management of snow crab based on biology Kyoto Institute of Oceanic and Fishery Science Special Report No4 pp

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