The weaning and the development of biological performance of extensively reared sea bream, Sparus auratus, fry after replacing continuous feeders by self-feeding distributors

TitleThe weaning and the development of biological performance of extensively reared sea bream, Sparus auratus, fry after replacing continuous feeders by self-feeding distributors
Publication TypeJournal Article
Year of Publication1986
AuthorsDivanach, P, Kentouri M, Dewavrin G
JournalSur le sevrage et l'evolution des performances biologiques d'alevins de daurades, Sparus auratus, provenant d'elevage extensif, apres remplacement des nourrisseurs en continu par des distributeurs libre serviceAquaculture
Volume52
Issue1
Pages21 - 29
Abstract

Extensively reared 0.13 g Sparus auratus sea bream fry were placed under intensive conditions (one individual per litre) and progressively weaned with dry pellets by two successive methods: prescribed feeding, and self-feeding. Results show that biological and ecological data on fry productivity are strongly dependent on feeding strategy. During the first period when pellets were supplied with a 9 h/day continuous feeder, production data are technically and economically correct but biologically poor (food conversion ratio 5 to 7; chronic mortality of 0.77% per day; disastrous hydric conversion ratio of 2415 m3/kg production). On the other hand, during the second period when the fry were self-feeding and free to regulate their feeding pattern, biological data become very good (food conversion ratio 1.95; mortality less than 0.03% day; hydric conversion ratio of 249 m3/kg production). The two techniques are discussed and compared in their ecological, metabolic and physiological aspects. © 1986.

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