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http://dx.doi.org/10.5657/kfas.2002.35.3.223

fisheries Biology of Shrimps in the South Western Waters of Korea -1. Species Composition of Catches and Spawning Season of Acetes sp. for the Korean Shrimp Fishery-  

Oh Chul Woong (Department of Marine Resources, College of National Sciences, Mokpo National University)
Jeong In Ju (Department of Marine Resources, College of National Sciences, Mokpo National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.35, no.3, 2002 , pp. 223-230 More about this Journal
Abstract
Investigations were made on catch composition, sex ratio, relationships between carapace length, body weight and fecundity and spawning season of major target shrimps (Acetes chinensis, A. japonicus) in the shrimp fishing areas of south-western coastal waters, accounting for about $45\%$ of annual shrimp landings in Korea. Catches were collected monthly in the fishing areas from March 2000 to February 2001, using single pocket-walled fishing gear, Total 59 species (shrimps 14, fishes 34, other crustaceans 8 and cephalopods 3 species) occurred. During the study period the bycatch-to-shrimp ratio of shrimp fishery was 2.42 in April 2000 and less than 1 for all months except for August 2000 and Febuary 2001. Compared with shrimp fishery of other areas and nations, these results indicate that effect of the fishing gear on catches of other species is minor, suggesting higher gear selectivity for shrimps. Of shrimps, there were two dominant species (A. chinensis, A. japonirus). Average sex ratio was 1.44 $\pm$ 0.42 for A. japonicus and 1,44 $\pm$ 0.43 for A. chinensis, which are dominant females in August. Average fecundity was 4,812 $\pm$ 1,511 for A. japonicus and 5,561 $\pm$ 1,900 for A. chinensis. In the two species mature females were found in the period from May to August. Similarly, the gonadosomatic index (GSI) was higher in July and August, with a peak in July, These results indicate that their main spawning season was summer.
Keywords
Catch composition; Landing; Bycatch; Sex ratio; Fecundity; GSI; Spawning season;
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