Fisheries and Aquatic Sciences

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Age and Growth of the Elongate Ilisha Ilisha elongata

  • Kim, Jin-Koo (Fisheries Resources Research Team, National Fisheries Research and Development Institute) ;
  • Choi, Ok-In (Tidal-flat Research Center, West Sea Fisheries Research Institute, National Fisheries Research and Development Institute) ;
  • Kim, Joo-Il (Fisheries Resources Team, South Sea Fisheries Research Institute, National Fisheries Research and Development Institute) ;
  • Chang, Dae-Soo (Fisheries Resources Research Team, National Fisheries Research and Development Institute) ;
  • Park, Kyeong-Dong (Department of Marine Biology, Pukyong National University)
  • Published : 2007.03.31
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Abstract

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 $F=7.7{\times}10^{-7}{\times}FL^{4.9269}$.

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References

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