1248 EFEITOS DA TEMPERATURA DA ÁGUA NO COMPORTAMENTO DA PIRAMUTABA, Brachyplatystoma vaillantii (VALENCIENNES, 1840) (TELEOSTEI, PIMELODIDAE) EM CONDIÇÕES DE LABORATÓRIO

Resumo

This paper aims to evaluate the behavior of the young catfish (Brachyplatystoma
vaillantii) in response to temperature changes. For the analyses were used 5
treatments with one replication during 24 hours and the thermal lethal test was
done from elevation and reduction of the temperature to each 1 °C to observe the
fish behavior until their death. All treatments were started with the same temperature
observed in the site of fish sampling (27 °C) with minimum temperature of the 17
°C and the maximum of the 37 °C, however the lethal test does not present limits
of the temperatures. The experiment was carried out in aquariums with standard
size of 96 liters on Dynamics Fishery Population Laboratory of the Fishery Research
and Management Center of the Northern Littoral – Cepnor/Ibama. The behavior
variables observed in these analyses of change in the behavior were coloration,
operculum-beat, loss of equilibrium, presence of haematoma, motility, and others.
In the statistical analysis were calculate position and dispersion measure, χ2
test
to verify if there are or there are not significant difference in operculum-beat between
the treatments and the replications, homogeneity of variance test and Duncan test.
The changes in the behavior in response to elevation and reduction of temperature
were observed from 32 °C and 22 °C, respectively. The lethal limits for change of
increase and reduction of temperature were 30 °C and 21 °C. For to test the
homogeneity between replications in relation to operculum-beat, it was observed
that, at least one of the averages differed. The Duncan test showed that operculumbeat averages of young catfishes under different temperature effects are statistically different (P < 0.05). To be able to adapt catfish in captivity is recommended
considering the temperature, as limiting parameter for its adaptation and
development, because the behavior of the young catfish is influenced by temperature.