A total of 1800 bullfrog froglets (Lithobates catesbeianus)
(7.60 ± 0.59 g) were divided in six pens of 12 m2 and density 25/m2. Three fattening pens contained linear
cement feeders (3.0 × 0.50 m) with a V-shaped bottom that crossed the pen longitudinally at each side of
the pool containing commercial diet(40% crude protein) with added 5% housefly larvae. In the other three
pens, six vibrating feeders trays (80 × 34 cm) per pen were arranged linearly,three at each side ofthe pool
with commercial ration without housefly larvae. The productive performance of frogs was assessed by
weight gain, feed intake, feed conversion, specific growth rate and survival by 90 days. We observed that
bullfrog froglets receiving food in a vibrating feeder tray present better productive performance (weight
gain, feed conversion and specific growth rate) than animals fed ration and housefly larvae in a linear
feeder. This response can be related to the greater visual stimulus of the food by frogs fed in vibrating
feeder trays, in which food had greater movement.