Length-weight relationship and condition factor of 11 fish species in streams of a protected area in the Acre River basin, northern BrazilThis study evaluated the length-weight relationship (LWR) and the relative condition factor (Kn) of 11 fish species in streams of the São Francisco Igarapé Environmental Protection Area (APA), located in the Acre River Basin, Amazon. LWR is an essential tool for assessing growth, body condition, and biomass of fish populations, reflecting aspects of species' well being. Additionally, the relative condition factor (Kn) is a crucial parameter for indicating the physical state and health of species, reflecting the amount of energy accumulated relative to size. The research revealed that the growth coefficient (b) ranged from 2.65 to 3.33, indicating predominantly isometric growth in several species, where weight gain parallels length growth. Fish were collected at seven sampling points using active search methods. Results showed that most species exhibited isometric growth, with Kn values ranging from 0.71 to 1.4, with 8 species showing Kn values greater than 1. These results suggest that the São Francisco Igarapé APA provides favorable conditions for fish growth and health, although some species showed variations in growth and well being indices, possibly due to environmental pressures. This study contributes to the understanding of the biological dynamics of fish populations in the region and provides valuable information for the management and conservation of species in protected areas of the Amazon.
Keywords:
Amazon; biomass; body condition; growth patterns
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