Abstract

HERNANDEZ, Crisantema et al. Effect of soybean and tuna gonad in the diet of juvenile bullseye puffer fish Sphoeroides annulatus. Hidrobiológica [online]. 2013, vol.23, n.3, pp.320-327. ISSN 0188-8897.

The purpose of this study was to evaluate the utilization of different protein ingredients in practical diets for juvenile of bulleseye puffer fish Sphoeroides annulatus. A feeding and subsequent digestibility in vivo experiments were carried out to evaluate the effect of using tuna gonad (TG), extruded soybean meal (SBM_e), and solvent extracted soybean meal (SBM), as complementary protein sources to fishmeal (FM), in practical diets for puffer fish. Four diets were formulated (50.0% crude protein, 9% crude lipid and 20.1 kJ g^-1 energy), the control diet (CRL) was elaborated with fishmeal and tuna gonad, the second diet (SBM_e) fishmeal and extruded soybean meal, the third diet (TG-SBM) included FM, tuna gonad and soybean meal, the fourth diet (SBM) fishmeal and soybean meal; a fifth diet, a commercial marine fish feed was used as a reference (REF). The response of juvenile fish (mean initial wt ± SD, 40.5 ± 1.3 g) to experimental diets and REF feed was evaluated by measuring weight gain, specific growth rate (TCE), protein efficiency ratios (PER) and feed convertion ratios (FCR) over a 70 days period. Fish fed TG-SBM diet revealed a better growth performance, however this combination of ingredients was no significantly different to the other experimental diets (p > 0.05). The fish fed REF feed showed a lower growth performance than the four experimental diets (p < 0.05). SBM and TG were digestible ingredients that were used to replace and, therefore, reduce the level of inclusion of fishmeal in the diet of bullseye puffer fish.

Keywords : Digestibility; growth; protein source; soybean meal; tuna gonad.

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