YOLK PROTEINS AND DIETARY LIPIDS IN THE SEA BASS

The sea bass, Dicentrarchus labrax, spawns naturally in the Mediterranean area from December to March, but the period of spawning can be delayed and restricted in length in more northern latitudes (Carrillo et al., 1995). It also may be shifted by maintaining the animal under modified photoperiods (Carrillo et al., 1989; 1995). Moreover, it has been found that exposure of female fish to modified photoperiod affects the rate of maturation and timing of spawning (Carrillo et al., 1989; Barnabè and Paris, 1984), while little loss in egg quality in terms of survival of eggs and fry or of fecundity was observed in photoperiodically advanced broodstock (Devauchelle et al., 1987; Carrillo et al., 1995). In contrast, poorer fecundity and egg survival have been found in photoperiodically delayed fish (Zanuy et al., 1986; Devauchelle and Coves 1988; Carrillo et al., 1991). Currently, one of the major constraints to continued expansion of farmed marine species is poor egg qualSCI. MAR., 62 (4): 311-318 SCIENTIA MARINA 1998

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