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Changes in protein, lipid, and energy contents of developing Clarias gariepinus eggs and larvae are examined. The mean egg weight is 1.3 mg, with an average composition of 79.2% water, 20.7% protein, 5.6% lipid, and 2.1% ash. Hatching occurs at 52 physiological day degrees (PD°) and yolk is completely absorbed at 205 PD°. Exogenous feeding starts at 166 PD°, before complete yolk-sac absorption. From fertilization until the sampling point closest to complete yolk absorption ( 195.4 PD°), conversion efficiencies of yolk dry matter, protein, and lipid to body tissue are respectively 73.5%, 74.2%, and 47.4%. In the same period, protein and lipid contribute respectively 1.6 and 1.5 J/ind to the total energy expenditure. Article from Marine Science Symposia Vol. 201 - "Mass rearing of juvenile fish". Symposium held in Bergen, 21-23 June 1993. To access the remaining articles please click on the keyword "MSS Vol. 201". |
