TAILIEUCHUNG - Effects of dietary n-3 and n-6 fatty acids levels on egg and larval quality of Eurasian perch

three groups of 40 perch breeders were reared in order to study the effects of 3 different levels of dietary n-3 and n-6 fatty acids on egg quality. two experimental diets, r1 and r2 (n-3/n-6 = and , respectively), were compared to one commercial food, r3 (n-3/n-6 = ). spawning and fertilization rates were high for diets r1 and r3, which displayed a n-3/n-6 ratio of and in the eggs, respectively, by comparison with r2 (n-3/n-6 = ), which produced low reproductive performances. We can conclude that dietary n-3 and n-6 FA levels influence egg and larval. | Effects of dietary n-3 and n-6 fatty acids levels on egg and larval quality of Eurasian perch by Emilie HENROTTE 1 Julia Lynne OVERTON 2 Patrick KESTEMONT 1 ABSTRACT. - Three groups of 40 perch breeders were reared in order to study the effects of 3 different levels of dietary n-3 and n-6 fatty acids on egg quality. Two experimental diets R1 and R2 n-3 n-6 and respectively were compared to one commercial food R3 n-3 n-6 . Spawning and fertilization rates were high for diets R1 and R3 which displayed a n-3 n-6 ratio of and in the eggs respectively by comparison with R2 n-3 n-6 which produced low reproductive performances. We can conclude that dietary n-3 and n-6 FA levels influence egg and larval quality of Eurasian perch. Key words. - Perca fluviatilis - Egg quality - Fatty acids. Introduction One of the major constraints for the development of Eurasian perch culture is the supply of good quality eggs. The importance of 3 fatty acids FAs docosahexaenoic 22 6n-3 DHA eicosapentaenoic 20 5n-3 EPA and arachidonic 20 4n-6 ARA acids in the reproduction and egg quality has been demonstrated Bell et al. 1997 . As a result of chemical similarities among these particular FAs leading to competitive interactions the optimal requirement for each individual FA is difficult to assess. The objective of this study was to determine the FA composition of eggs obtained from broodstock fed different n-3 and n-6 FAs levels in relation with reproductive performances egg quality and larval robustness. Methods Three groups of 40 perch breeders were reared in order to test different levels of dietary n-3 and n-6 FAs 16 lipids during 9 months from March to November 2006 . Two experimental diets R1 and R2 n-3 n-6 and respectively were compared to one commercial fish diet R3 n-3 n-6 . Spawning and fertilization rates were checked in November and larval robustness was evaluated by osmotic shock 1 hour in NaCl 2 20 C two days after hatching. Total .

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