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Elevage expérimental de la perche Perca fluviatilis L. : développement larvaire et croissance

Abstract : Embryos of perch are harvested from ponds and incubated in laboratory. Larvae are fed successfully with artemia nauplii. About two days after hatching, the gas bladder is filled with atmospheric air. Larval development study shows that larvae are not fully developped at hatching. Yolk sac entire resorption is completed at two weeks old. A week later, there are significant changes : twin cones appear in the retina which was pure cone at hatching; numerous gill lamellae are present ; the pronephros is replaced by a mesonephros with an adult kidney structure. The digestive tract simple and rectilinear at hatching, is curly and more developped with the presence of three pyloric coeca. Larval rearing tests demonstrate the necessity of a recirculating system. At larval stage, perch do not accept artificial diet. They reach twelve millimetres at two weeks old. Juveniles can be weaned successfully from a size of sixteen millimetres. Perch harvested from ponds can also be successfully weaned if their size is not over one hundred millimetres. Above this size, survival rate is lower. Grading allows the separation of perch from the same strand into groups of different growth rates. The body weight heterogeneity among perch population could be explained by the dominance effect. The effect of temperature is not significant on growth when perch are raised at constant temperature in the optimal range. Perch growth is described by exponential models. A prediction of the growth rate in weight can be performed using two variables : initial body weight and the diet conversion index. From larval stage, perch of marketable size can be produced intensively in sixteen months
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Raphaël Sourou Vlavonou. Elevage expérimental de la perche Perca fluviatilis L. : développement larvaire et croissance. Biologie animale. Université Paul Verlaine - Metz, 1996. Français. ⟨NNT : 1996METZ056S⟩. ⟨tel-01777177⟩



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