• Fisheries and Aquatic Sciences
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• v.10 no.1
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• pp.30-36
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• 2007

We present age and growth data for Ilisha elongata, based on 363 specimens caught in 1999 and 2000 around Jeju Island and the southwest coast of Korea. Scale and ring radii of each ring group showed a direct one-to-one relationship, with ring radius increasing as scale radius increased. The relationship between fork length and scale radius was FL=39.553SR+60.935 for females, FL=39.474SR+54.026 for males, and FL=39.608SR+57.547 for both sexes. Monthly changes in the marginal index indicated that a new ring appears once each year (in July). Maximum age, mean age and mean fork length of fish were 10 years, 5.0 years, and 349mm, respectively. Von Bertalanffy's growth equations were $FL_t=495.4{\times}[1-\exp(-0.2586(t+0.6487))]$ for fork length (mm) and $W_t=1,112.5{\times}[1-\exp(-0.2586(t+0.6487))]^{2.874}$ for body weight (g) for both sexes. Monthly changes in the gonadosomatic index (GSI) indicated that the spawning period was in June and July, which corresponded closely with ring formation time. Differences in monthly GSI changes in 1999 and 2000 may be related to water temperature variation. Fecundity ranged from 5,664 to 176,290 eggs per individual (n=43, fork length 264-470mm). The relationship between fecundity(F) and fork length was $F=7.7{\times}10^{-7}{\times}FL^{4.9269}$.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.412-413
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• 2000

준치(Ilisha elongate)는 분류학상 청어목(Clupeiformes), 준치과(Pristigasteridae)에 속하는 어종으로(Nelson, 1994; Kim and Kim, 1997, 우리나라, 일본, 동중국해, 싱가포르, 인디아 등지에 분포한다(Whitehead, 1987). 준치는 우리나라의 제주도 서남 해역에서 월동하고, 강 하구나 기수역에서 산란하며 남하하는 계절회유성 어종이다(Kim et al., 1994). (중략)