Journal of the Marine Biological Association of the UK



Research Article

Biology of the cocktail shrimp, Trachysalambria curvirostris (Decapoda: Penaeidae) in the Yellow Sea of Korea


H.K.  Cha a1, C.W.  Oh a2c1 and J.H.  Choi a3
a1 Fisheries Resources Research and Management Division, National Fisheries Research and Development Institute, Busan 619-902, South Korea
a2 Department of Marine Resources, Mokpo National University, Chonnam 534-729, South Korea
a3 Korea Inter-University Institute of Ocean Sciences, Pukyong National University, Busan 608-737, South Korea

Article author query
cha hk   [PubMed][Google Scholar] 
oh cw   [PubMed][Google Scholar] 
choi jh   [PubMed][Google Scholar] 

Abstract

Trachysalambria curvirostris occurs widely along the south and west coasts of Korea with a range extending from Kanghwado in the north-west, down to Sarangdo in the south-east. With seasonal warming of the waters starting in April, the shrimps begin to migrate from deep waters to the coastal area. Zoea and mysis larvae occurred from June to August. Sex ratio showed seasonal variations, with a mean value of 56·7% for the females. The species produces one cohort a year, with the ovaries ripening from June to July. Insemination appeared to take place from June to August, as more than half of the females sampled in the study over 15–16 mm carapace length were inseminated. Mean gonadosomatic index (GSI) reached a maximum between June and July. The smallest mature female found was 15 mm carapace length (CL). Size at 50% sexual maturity (CL50), determined from both mature females and inseminated females, was 15·37 mm and 16·49 mm CL, respectively. Fecundity was directly proportional to the size of the female, with clutch sizes varying from 16,380 eggs in the smallest female to 114,621 eggs in the largest, and the eggs ranged from 230 μm to 340 μm in diameter. The life span of females appeared to be 14–15 months according to size frequency distributions, while that of the male was 13–14 months. Population growth was estimated by the modified von Bertalanffy growth function incorporating seasonal variation in growth. Based on the growth parameters (K=2·00 y−1 and L[infty infinity]=24·64 mm CL for females, and K=2·00 y−1 and L[infty infinity]=19·00 mm CL for males) growth curves showed that females grew faster and reached a larger size at age than males. This result is supported by differences in growth performance indices (φ′).

(Received February 2 2003)
(Accepted February 21 2004)


Correspondence:
c1 e-mail: chuloh@mokpo.ac.kr