Abiayad Smea, Melard, C., Kestemont, P.-1997
Aquaculture International, 5 (2) : 161-168
Abstract:
This study investigated the relationships between fatty acid composition of broodstock diet and egg and larval quality of Eurasian perch Perca fluviatilis. Fertilization rate of eggs and resistance of larvae to various stress tests (osmotic shock and starving) were used as criteria of quality. Results obtained with eggs and larvae from broodstock fed different diets were compared to those from wild broodstock considered as reference material. Three broodstock diets (D1, D2 and D3) showing similar proximate composition, but differing in the levels of some fatty acids (18:3n-3, 20:5n-3 and 22:6n-3) were given to adult perch during the 6 months prior to spawning. Characteristics of eggs (total n-3/total n-6 fatty acid ratio) and larvae (body weight and resistance to stress) obtained from broodstock receiving the highest levels of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) (D3 diet) were comparable to those of wild broodstock (p>0.05), but differed from those of D1 (low levels of linolenic acid, EPA and DHA) and D2 (low levels of EPA and DHA but highest level of linolenic acid) diets (p<0.05). These results reflected the influence of 20:5n-3 (EPA) and 22:6n-3 (DHA) fatty acids in broodstock diet on the quality of Eurasian perch eggs and larvae as measured by fertilization rate, larval weight and stress resistance.
(Univ Liege, Lab Demog Poissons and Aquaculture, 10 Chemin Justice, B-4500 Tihange, Belgium)
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