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Variation in egg and larval quality in various fish and crustacean species Lavens, P.; Sorgeloos, P. (1991). Variation in egg and larval quality in various fish and crustacean species, in: Lavens, P. et al. (Ed.) Larvi '91. Short communications and abstracts of contributions presented at the international Symposium on Fish and Crustacean Larviculture. Gent, Belgium, August 27-30, 1991. EAS Special Publication, 15: pp. 221-222 In: Lavens, P. et al. (1991). Larvi '91: Short communications and abstracts of contributions presented at the international Symposium on Fish and Crustacean Larviculture. Gent, Belgium, August 27-30, 1991. Special Publication European Aquaculture Society, 15. European Aquaculture Society: Gent. ISBN 90-71625-09-5. 427 pp., meer In: Special Publication European Aquaculture Society. European Aquaculture Society: Bredene. ISSN 0774-0689, meer

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Beschikbaar in	Auteurs
VLIZ: Open access 262328 [ download pdf ]

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Trefwoorden

Acids > Organic compounds > Organic acids > Fatty acids Aquaculture facilities > Hatcheries Aquaculture techniques Cells > Sexual cells > Eggs Composition > Biochemical composition Control > Quality control Cultures > Fish culture Cultures > Shellfish culture > Crustacean culture Vitamins > Vitamin C Marien/Kust; Brak water; Zoet water

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Auteurs		Top
Lavens, P., meer Sorgeloos, P., meer

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Abstract

It is generally accepted, that a major constraint in the further development of marine fish and crustacean aquaculture, is the variable quality of eggs and larvae used for the hatchery-production of fry. Nonetheless, valid criteria to evaluate optimal egg quality have not been identified yet. Instead, particular indicators, are used, e.g. the fertilization and hatching rate, overall culture success during the first rearing period, etc., but these are not totally objective because hatchery-specific conditions may interfere. The biochemical composition of the egg may be one of the possible determinants of egg quality, which can be evaluated on a more objectie basis. In this respect, studied have been initiated to analyze in freshly-released eggs, the levels of two nutrients which are believed to play a critical role in the early larval development, i.e. (n-3) highly unsaturated fatty-acids (HUFAs) and vitamin C. Analytical data have been gathered for various species of marine fishes (Scophthalmus maximus, Epinephelus tauvina and E. fuscoguttatus, Dicentrarchus labrax, Sparus aurata, and Pagrus major) and for the freshwater prawn (Macrobrachium rosenbergii). Egg samples have been collected from wild females and from captive broodstock kept under various conditions at various hatcheries. Results available so far illustrate that for some of the species tested HUFA levels and total lipid content in the eggs vary considerably among spawnings, even when coming from the same hatchery. The highest variation was noted in turbot broodstock, i.e. the HUFA levels and total lipid content ranged from 19 to 47 mg/g DW, and 8 to 30%, respectively. Contents of ascorbic acid in turbot eggs varied up to 100%, respectively 500% among different egg batches provided by two hatcheries.

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