Protein requirement in masculinized and non-masculinized juveniles of Bay Snook Petenia splendida

Arkady Uscanga-Martínez, Carlos Alfonso Álvarez-González, Wilfrido Miguel Contreras-Sánchez, Gabriel Márquez-Couturier, Roberto Civera-Cerecedo, Héctor Nolasco-Soria, Alfredo Hernández-Llamas, Ernesto Goytortúa-Bores, Francisco Javier Moyano

Resumen


The effect of the dietary protein level on growth and total body chemical composition of the native cichlid Bay snook (Petenia splendida), masculinized and non-masculinized, was studied. Five semi-purified diets with protein levels 35, 40, 45, 50 and 55% crude protein (CP) were formulated and evaluated by triplicate. Groups of 50 juveniles were each stocked in 70 L tanks and fed to apparent satiation for 42 days trial. At the end, weight gain (WG) (403.41%), body length (BL) (6.58 ± 0.10 cm) and specific growth rate (SRG) (1.67%/day) of the masculinized fish were obtained with the 45% CP diet, and they were significantly different (p = 0.002) from the other treatments. In the case of non-masculinized fish, the 45 and 55% CP treatments showed significant differences (p = 0.00001), with respect to other treatments, with a WG of 398 and 394%, SGR of 1.66 and 1.63%/day, protein productive value (PPV) of 28.91 and 29.21%, and feed conversion rate (FCR) of 1.23 and 1.08 respectively. Protein body composition for masculinized fish was different (p = 0.0001) only for fish fed 35% CP compared with fish at the beginning of the experiment. We conclude that the optimum protein requirement, estimated by the broken-line model for masculinized and non-masculinized P. splendida was 45 and 44.8% PC respectively

Palabras clave


Cichlid; larviculture; nutrition; protein; Tenguayaca.

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