Parâmetros zootécnicos e fisiológicos de tambaqui (Colossoma macropomum) e híbrido tambatinga (fêmea de C. macropomum x macho de P. brachypomus) durante cultivo em viveiro escavado

Abstract

The aim of this study was to compare the growth and performance of tambaqui and tambatinga during fattening semi-intensive system to create and evaluate the effect of routine management of biometrics performed in fish farming in the physiological responses to stress these fish. Monthly Sampling was done monthly and is calculated at the end of the experiment, production parameters, such as weight gain, daily weight gain, biomass gain, final biomass and feed conversion. At the end of the experiment, blood was collected before biometrics; Immediately after; two; 24; 48 and 72 hours of biometrics for evaluation of physiological indicators of stress samples tambaqui and tambatinga subsequently being collected some animals to yield calculations in whole fish, fillet and band. On the conditions proposed in this study, the results indicated that the hybrid tambatinga achieved higher growth only in the initial phase of cultivation (120 days) and the creation of period end tambaqui obtained higher high and productive performance yield in bands when compared to hybrid tambatinga. Cortisol levels in the tambaqui and hybrid tambatinga suggest that fish were familiar to the handling of biometrics. In both fish, blood glucose rose after completion of biometrics, with a return to homeostasis 2 and 24 hours after the management and tambaqui tambatinga, respectively. Hypochloraemia was found in both fish just 72 hours after the completion of biometrics. Hematologic responses indicated that the management of biometrics caused an increase in cell volume of red blood cells, resulting in changes in hematocrit and decreased hemoglobin concentration. The management of biometrics promotes hormonal changes, haematological and electrolyte in tambaqui and hybrid tambatinga, but when adopted routinely at regular intervals causes of magnitude lower stress responses.