Nippon Suisan Gakkaishi 68 (6), 859-865 (2002)

Age and growth of Girella punctata in Kushimoto, Wakayama Prefecture, Japan

MITSUHO MAEDA,1a SEISHI KIMURA2 AND TETSUJI NAKABO3

1Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto, Kyoto 606-8502, 2Fisheries Research Laboratory, Mie University, Shima, Mie 517-0703, 3The Kyoto University Museum, Kyoto, Kyoto 606-8501, Japan

Age and growth of Girella punctata were estimated by analyzing the ring marks on scales taken from specimens collected from Kushimoto, Wakayama Prefecture, Japan. Examination of marginal increments of scales showed that ring marks were formed once a year, from February to April. The relationships between fork length (FL in mm) and scale radius (R in mm) were shown by separate equations for each sex: FL=26.1R+22.1 (for males); FL=24.8R+29.3 (for females). In addition, von Bertalanffy's growth equations for fork length (Lt) and weight (Wt) at full age (t) were as follows: Lt=380(1−exp(−0.244(t+0.887))), Wt=1160(1−exp(−0.244( t+0.887)))2.95. No sexual differences were found in the growth of G. punctata. It was also estimated from the gonadosomatic index analysis that the species mainly spawns in April.


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