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Effect of dietary protein and energy levels on growth, survival and body composition of juvenile Totoaba macdonaldi

2011; Elsevier BV; Volume: 319; Issue: 3-4 Linguagem: Inglês

10.1016/j.aquaculture.2011.07.007

1873-5622

Servando Rueda‐López, Juan Pablo Lazo, Juan Gabriel Correa-Reyes, Marı́a Teresa Viana,

Aquaculture disease management and microbiota

The protein to energy ratio (P:E) to maximize growth was evaluated for the totoaba (Totoaba macdonaldi) an endemic fish of the Gulf of California with a high potential for aquaculture. A complete factorial design was used to formulate six experimental diets at three protein levels (43, 48 and 52% Crude protein; CP) and two lipid levels (8.5 and 18% Crude lipids; CL). Two hundred and seventy juvenile totoaba (mean initial weight 12.12 ± 0.09 g) were randomly distributed in 18 (375 L) tanks (6 treatments in triplicate groups) and fed the experimental diets for 10 weeks. At the end of the experiment, fish fed the high protein and low lipid diet (P:E of 25.7 mg protein:kJ− 1) resulted in significantly higher weight gain (489%) compared to the other treatments. Dietary protein levels significantly affected weight gain but within a protein level, higher lipid levels resulted in reduced growth. No significant differences in survival were observed at the end of the experiment. The fish fed diets containing 18% lipid resulted in reduced feed intake and explained the reduced growth rates observed in fish fed the high lipid diets. However the protein efficiency ratio (PER) was unaffected. The high lipid with low and medium protein content diets significantly reduced growth due to a reduction of feed intake from the unbalanced P:E ratio. No differences in body fat accumulation were observed, both in muscle or viscera, due to a high quality protein and lipid sources ingredients used in the present work. Further research is warranted evaluating lipid digestion in totoaba to optimize lipid utilization.