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Populations and production of fish in two small tributaries of the Paraná River, Paraná, Brazil

✍ Scribed by A. A. Agostinho; T. Penczak

Publisher
Springer
Year
1995
Tongue
English
Weight
738 KB
Volume
312
Category
Article
ISSN
1573-5141

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✦ Synopsis

Mean biomass (B) and production (P) of fish in two small tributaries of the Parana River (Parana, Brazil) were 61 kg ha -' and 48 kg ha 1 yr -1 in the Caracu River and 29 kg ha -1 and 26 kg ha ' yr -1 in the Agua do Rancho River, respectively . Matrix correlation analysis revealed high positive correlations of both f? and P to maximum depth and hiding places and, at a lower level of significance, to mean depth, pH and oxygen level . Lower g and P values were found in the Agua do Rancho River, whose valley has retained a more natural character, rich canopy and scarcity of macrophytes, but also lower conductivity and nitrogen and phosphate levels than those in the Caracu River .

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