Abstract
The use of broodstock of different origin as a method to improve fry production performance and consequently to minimize deformities was examined at industrial scale in a commercial gilthead sea bream hatchery. The outcome of fry production from three different broodstock groups (BA: broodfish (Mediterranean) with multiannual hatchery presence, BB: selected offspring originating from the BA group, and BC: broodfish of Atlantic origin) was investigated in the same rearing conditions and feeding protocol. Performance factors assessed were the survival and weaning of the larvae; the mortality rates from the “weaning until the end of the hatchery stage” of the larvae/fry; the percentage of fry without swim bladder; the percentage of fry with skeletal deformities and the feed conversion ratio. In all factors, no statistical differences among the experimental groups were detected. However, due to early rejection of the deformed individuals, benefits are expected from the decrease of the supplied amount of food and the reduced labor cost.
Highlights
IntroductionSeveral improvements in hatchery rearing technology and use of broodstock have been occurred in the last decades (Theodorou 2002; Pavlidou 2009)
One of the main stages of marine aquaculture is larval production
Since the aim of the study was to improve the gilthead sea bream fry production at industrial scale through the reduction of fry losses caused by skeletal deformities, the effort was concentrated on the analysis of the data obtained throughout the entire typical production cycle of the hatchery
Summary
Several improvements in hatchery rearing technology and use of broodstock have been occurred in the last decades (Theodorou 2002; Pavlidou 2009). Problems such as skeletal deformities still represent a major factor of quality degradation and fry losses for the hatcheries. Gilthead sea bream is one of the most important cultured species in the Mediterranean aquaculture. Several studies on fry deformities exist for this species, recording qualitative and quantitative data (Koumoundouros et al 1995; Divanach et al 1996; Koumoundouros et al 1997a, b; Galeotti et al 1999, 2000; Carrillo et al 2001; Cahu et al 2003; Boglione et al 2013a). Most of the studies include limited data in terms of the economic benefits from the reduction of fry deformity-
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