Batch Fecundity of the Japanese Silver-biddy Gerres equulus in the Yatsushiro Sea, Western Kyushu, Japan

摘要

The Japanese silver-biddy Gerres equulus (Temminck and Schlegel) is one of the most common shore fishes in the costal waters of southern Japan and commercially important for the local fishery. The batch fecundity of G. equulus was examined from the specimens collected in the Yatsushiro Sea, western Kyushu, Japan in June-September, 2001 and 2002. Batch fecundity (BF) ranged from 15,083 to 92,356. The regression correlation between BF and standard length (SL) for the early and the late spawning periodwas significantly different and these regressions were expressed as BF = 1.00x10~(-4) SL~(3.79) (early spawning period) and BF=1.30x10~(-4) SL~(3.33) Gate spawning period), respectively. The BF of females at age 2-10 years was higher in the early spawning period than in the late spawning period.