Comportamento alimentar e qualidade da 芍gua em tanques de cria o de girinos de r -touro Lithobates catesbeianus = Feeding behavior and water quality in tanks containing bullfrog tadpoles Lithobates catesbeianus

作者：Lucia Helena Sipauba Tavares; Joceli Cristina Leite de Morais; Marta Verardino De Stefani

来源：Acta Scientiarum - Animal Sciences, 2008.

• plancton
• desempenho
• variaveis fisico-quimicas
• dieta natural
• dieta artificial
• plankton
• development
• physicochemical parameters
• natural diet
• artificial diet

O objetivo deste trabalho foi avaliar o comportamento alimentar e a qualidade da 芍gua em tanques de cria o de girinos de r -touro Lithobates catesbeianus durante 56 dias, a partir do est芍gio 25 da Tabela de Gosner (1960), criados em tanques de alvenaria comcapacidade de 1000 L. Os girinos que receberam ra o (R) e alga + plancton + ra o (APR) apresentaram o melhor peso e sobreviv那ncia, diferindo significativamente (p %26lt; 0,05) dos outros tratamentos (somente alga e alga + plancton). As vari芍veis f赤sico-qu赤micas da 芍guadiferiram significativamente (p %26lt; 0,05) durante o per赤odo experimental e entre os tratamentos. Foi observada uma rela o entre alimento fornecido e aqueles contidos no trato digest車rio dos girinos (rs = 0,39; p %26lt; 0,05). A partir de 14 dias, houve mudan a noh芍bito alimentar dos girinos procurando outros itens alimentares al谷m do plancton. A utiliza o de dietas naturais quando combinadas com dieta artificial (ra o) proporcionou desenvolvimento satisfat車rio aos girinos. The objective of this study was to evaluate the effect of food treatments and water quality on the development of bullfrog tadpoles. The analysis, carried out in 1000 L tanks, was undertaken by weight and survival rates, during 56 days, as from stage 25 (Gosner, 1960). Treatments with ration (R) and algae + plankton + ration (APR) had the best results in weight and survival rates, which were significantly different (p %26lt; 0.05) from the other treatments, comprised of algae only or algae + plankton. Physical and chemical variables of water differed significantly (p %26lt; 0.05) during the experimental period and among treatments. There was a correlation between the concentration of species present in the food and in the tadpole digestive tract (rs = 0.39; p %26lt; 0.05). From the 14th dayof age, bullfrog tadpoles changed their feeding behavior, or rather, a search for food items other than plankton occurred. The utilization of combined natural and artificial (ration) diets to feed bullfrog tadpoles was feasible and yielded a satisfactory development in theanimals.