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Biochemical development and energetics of Hippopus hippopus larvae
Book chapter   Peer reviewed

Biochemical development and energetics of Hippopus hippopus larvae

Paul C Southgate
Giant clams in Asia and the Pacific, pp.140-144
ACIAR Monograph, 9, Australian Centre for International Agricultural Research
1988
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Abstract

Fisheries Sciences giant clam culture giant clam fisheries mariculture
The biochemical composition of fed and starved larvae of Hippopus hippopus was determined throughout development using a microanalytical scheme. Total organic matter increased during development from fertilised eggs to day 10 pediveliger, but decreased during settlement from day 10 to day 14. Ash content increased from 29.03070 in fertilised eggs to 75.0070 in day 10 pediveligers. Ash content further increased through settlement to 86.39070 on day 14. Lipid and protein levels increased during development from fertilised eggs to day 10, while carbohydrate levels remained relatively low and constant during this period. In excess of 60070 of the total organic matter in fertilised eggs was composed of lipid, and this high level was maintained throughout larval development to settlement. On settlement, lipid levels decreased sharply from 69.05070 to 29.16070 on day 14, with a corresponding increase in protein from 26.38070 to 64.58070 during the same period. During short periods of starvation, the major proportion of both the weight and caloric losses were due to lipid. Protein was utilised during starvation of 3-day-old larvae for 3 days, but increased during starvation of older (6-9 days) larvae. Carbohydrate levels remained low, and changed little during starvation. Lipid was the major energy reserve of larvae and the energy source for settlement and metamorphosis.

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