Abstract
The physical and chemical characteristics of the culture water affect strongly the growth, reproduction, health and survival of fish. The present work was designed to evaluate the effects of the photosynthetic activity on the Nile Tilapia Oreochromis niloticus culture water’s total alkalinity. There were eighteen 25-L polyethylene aquaria equally distributed in two culture systems (indoor and outdoor). At the setup fifteen 0.52 ± 0.06 g juveniles were stocked in each indoor and outdoor aquarium. The indoor and outdoor aquaria were the control and experimental group, respectively, with 9 replicates each. Fish were maintained into the aquaria for 6 weeks. Every week water samples from each aquarium were collected to determine their total alkalinity and pH. These results were submitted to ANOVA for completely random experiments at 5% level of significance. The average water pH in aquaria without and with phytoplankton were 7.32 ± 0.39 and 8.45 ± 0.40, respectively. These results were significantly different between them (P
Highlights
The physical and chemical characteristics of the culture water affect strongly the growth, reproduction, health and survival of fish
Para manutenção da qualidade da água dos aquários, sifonava-se as fezes e os restos de ração presentes no fundo dos mesmos semanalmente
Figura 1 – Absorbância ótica de amostras de água de cultivo de alevinos de tilápia do Nilo, Oreochromis niloticus, em aquários com ou sem a presença de fitoplâncton, na faixa do vermelho (670 nm)
Summary
O trabalho foi realizado no Laboratório de Ciência e Tecnologia Aqüícola do Centro de Treinamento em Aqüicultura - CTA, unidade de pesquisa do Departamento de Engenharia de Pesca do Centro de Ciências Agrárias da Universidade Federal do Ceará (Campus Universitário do Pici, Fortaleza, Ceará)
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