伊勢湾産イカナゴのふ化特性と外部栄養への転換 [in Japanese] Hatching and Early Feeding of Japanese Sand Eel Ammodytes personatus in the Bay [in Japanese]
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Characteristics of hatching and transition from endogenous to exogenous nutrition of the Japanese sand eel <i>Ammodytes personatus</i> population in Ise Bay, central Japan, were studied in the laboratory. Duration to the peak hatching after fertilization were needed for 15, 13 and 11 days at 10.3°C, 12.0°C and 13.9°C, respectively. In the peak day, 46.1%, 62.3% and 73.2% of the total larvae hatched at the corresponding temperatures. Hatching predominantly occurred within 4 hours after onset of dark period at 17:00. Newly hatched larvae started feeding within 24 hours after hatching. All larvae completed yolk absorption within 13 days, but oil globle remained in 40% of the 30 days-old larvae. The sand eel larvae had a long mixed period of endogenous and exogenous nutrition. Daily growth rate during the first 30 days after hatching was 0.23mm at 10.1°C.
NSUGAF 64(3), 440-446, 1998-05-15
The Japanese Society of Fisheries Science