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Ferna´ndez-Palacios et al., 1995; Tandler et al., 1995; Fig. 4 Žauthors’ unpublished data...In these species, which are continuous spawners with short vitellogenetic periods, it ispossible to improve spawning quality by modification of the nutritional quality ofbroodstock diets even during the spawning season ŽFerna´ndez-Palacios et al., 1995,1997, 1998; Tandler et al., 1995.. Similarly, it is possible to improve egg quality andhatching rates of seabass by feeding broodstock with appropriate amounts of HUFAduring the vitellogenetic period which is slightly longer than that of sparids ŽNavas etal., 1997.. In batch spawners with up to 6 months of vitellogenesis ŽFre´mont et al.,1984., such as in salmonids, broodstock must be fed a good quality diet for severalmonths before the spawning season to improve their reproductive performance ŽWatanabeet al., 1984d; Corraze et al., 1993.. Although fatty acid profiles of fish muscle anddeveloping eggs of coho salmon ŽHardy et al., 1990. reflect dietary fatty acid profilesonly after 2 months of feeding, Harel et al. Ž1992. have shown that the tissue lipidcomposition of gilthead seabream broodstock reaches an equilibrium with the dietarylipids after only 15 days of feeding. Turbot could be an exception to this observationbecause it is important to feed broodstock with high nutritional quality diets duringvitellogenesis and spawning periods. The composition of turbot ovaries is more readilyaffected by the diet during the early stages of gonadal development ŽLie et al., 1993..
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