Bullfrog growth parameters in continuous water-flow tanks systems on a commercial scale
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The growth parameters of hatchery-reared bullfrog (Lithobates catesbeianus) reared at commercial continuous water-flow tanks systems were studied and discussed. We stock 3.000 juvenile with a density of 60 frogs/m2 (mean weight 16 ± 1.82 g) into three 16.5 m2 continuous water-flow tank systems with a depth of 12 cm flooded height. Bullfrog´s were fed twice daily (8:00 and 16:00 hours) with a reference floating extruded diet (45 % crude protein and 16 % crude lipids). After 50 day the mean weight was 26.03 ± 2.72 g. The apparent feed conversion rate (AFCR) was 1.5. A multi-model approach was used for select the best growth model for juvenile bullfrog under culture conditions. Two variations of Schnute model and Ruiz-Velazco model were used as a candidate model. With a weight of evidence of 76.94% according to Akaike weight, case 3 of Schnutte model was selected as the best model to describe bullfrog growth in continuous water-flow tank systems. The results about the best model obtained in this experiment are only applicable for the interval from 16 to 32 g.
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