Comparison of Survival and Development between Large and Small Neonates of a Freshwater Prawn under Starvation Conditions(Behavior Biology and Ecology)

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The relationship between the body size of neonates and starvation tolerance was investigated in the freshwater prawn, Palaemon paucidens de Haan. The mean survival time of the large (4.77mm in mean body length) and small (3.88mm) larvae at 20℃ was about 8 and 5 days after hatch, respectively. The longer survival of the large larvae meant more progressed zoeal development, under conditions where the molting interval was the same between the two groups. The mean survival time in each group was very close to the time when the visible yolk disappeared from the body. Moreover, the amount of total carbon consumable during the starvation in an individual body was significantly greater in the large larvae (49% of the initial content) than in the small larvae (36%). These facts suggest that increased inner-stocked available energy was important for the greater starvation tolerance of the large larvae. On the other hand, a relatively low metabolic (oxygen consumption) rate in the large larvae, which was determined for the newborn 1st- and starving 2nd-stage zoeae, may be less significant for larval survivorship. The ecological significance of varied neonate sizes was briefly discussed.
社団法人日本動物学会の論文
1985-06-15