ISSN:
1573-5117
Keywords:
Brazil
;
Paraná River catchment
;
small rivers
;
electrofishing
;
populations
;
mean biomass
;
production
;
turnover ratio
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Mean biomass (153-1) and production (P) of fish in two small tributaries of the Paraná River (Paraná, Brazil) were 61 kg ha−1 and 48 kg ha−1 yr−1 in the Caracu River and 29 kg ha−1 and 26 kg ha−1 yr−1 in the Agua do Rancho River, respectively. Matrix correlation analysis revealed high positive correlations of both 153-2 and P to maximum depth and hiding places and, at a lower level of significance, to mean depth, pH and oxygen level. Lower 153-3 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00015508
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