ゴマアイゴ仔魚の栄養転換〔英文〕

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The early larval development of Siganus guttatus was studied with emphasis on the transition From endogenous to exogenous feeding. Three rearing trials were conducted as follows: 1) rear-ing in a 5 ton concrete tank at 27.9-29.3°C (T-85 trial); 2) rearing in a 0.5 ton fiberglass tank at 22.2-26.5°C(T-86A trial); 3) rearing in the same manner as in T-86A but without food (T-86B trial). On the basis of the developmental events and energy flow in T-86A trial, the early life history of the species could be divided into the following seven phases: 1) rapid larval growth due to rapid yolk resorption (from hatching to about 15h after hatching (time after hatching: TAH)); 2) slow growth and organogenesis based mainly on yolk energy (to about 50h TAH); 3) slow growth based on energy of yolk, oil globule and exogenous food (to about 70h TAH); 4) slow growth based on two sources of energy, oil globule and exogenous food (to about 90h TAH); 5) the same mode of development and energy flow as in the preceding phase, but with a certain level of feeding amount (to about 120h TAH); 6) accelerated larval growth and effective feeding and swimming based only on exogenous food (to about 150h TAH); and 7) the same mode as in the preceding phase with accelerated increase of feeding amount (beyond 150h TAH). Differences in developmental mode were observed in T-85 and T-86A trials, but it could not be ascertained in this particular study which of the environmental factors played the greatest influence. The results of T-86A and B showed that the larvae, in order to survive, have to get over two obstacles on feeding, that is, to start feeding and to change from endogenous to exogenous feeding suitably.

ゴマアイゴ仔魚の栄養転換〔英文〕

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