Acta Limnologica Brasiliensia
https://app.periodikos.com.br/journal/alb/article/doi/10.1590/S2179-975X2125
Acta Limnologica Brasiliensia
Short Research Note

Length-weight relationship of 12 fish species from streams of a protected area in the Southwestern Amazon, Brazil

Relação peso-comprimento de 12 espécies de peixes de igarapés de uma área protegida no sudoeste da Amazônia, Brasil

Mariana Costa Fratari; Lucas Pires de Oliveira; Márcio Ygor Macêdo Damasceno; Raquel Eloá Lemos Lopes; Ronaldo Souza da Silva; Fabiano Corrêa; Lisandro Juno Soares Vieira

http://dx.doi.org/10.1590/S2179-975X2125 Acta Limnol. Bras. (Online), vol.37, e31, 2025
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Abstract

We analyzed the length-weight relationships of 12 lesser-known fish species sampled in four streams in the Southwestern Amazon, in Acre State, Brazil. Diurnal and nocturnal sampling took place in four streams in 150-meter sessions in March and November 2017. Linear regression was applied using the least squares adjustment method. In total, 867 specimens were collected, representing four orders, ten families, and 12 species. The b coefficient of the length-weight regression ranged from 2.58 to 3.22, and r2 from 0.77 to 0.99. Five species had negative allometric growth (b < 3), six had isometric (b = 3), and one had positive allometric growth (b > 3). The length-weight relationship was documented for the first time in 10 of the 12 species – Chrysobrycon hesperus, Knodus smithi, Phenacogaster pectinata, Carnegiella myersi, Pyrrhulina obermulleri, Gymnotus curupira, Brachyhypopomus sullivani, Corydoras cervinus, Denticetopsis seducta, and Bujurquina syspilus. Our results contribute to the knowledge on life cycle parameters of fish species from the Southwestern Amazon.

Keywords

Amazonian streams; allometry; conservation; growth pattern; isometry

Resumo

Analisamos as relações peso-comprimento de 12 espécies de peixes pouco conhecidas amostradas em quatro igarapés de terra-firme no sudoeste da Amazônia, no estado do Acre, Brasil. As amostragens diurnas e noturnas ocorreram em março e novembro de 2017. No total, foram coletados 867 exemplares, representando quatro ordens, dez famílias e 12 espécies. O coeficiente b da regressão peso-comprimento variou de 2,58 a 3,22, e o r2 de 0,77 a 0,99. Cinco espécies tiveram crescimento alométrico negativo (b < 3), seis tiveram crescimento isométrico (b = 3) e uma teve crescimento alométrico positivo (b > 3). A relação peso-comprimento foi documentada pela primeira vez em 10 das 12 espécies – Chrysobrycon hesperus, Knodus smithi, Phenacogaster pectinata, Carnegiella myersi, Pyrrhulina obermulleri, Gymnotus curupira, Brachyhypopomus sullivani, Corydoras cervinus, Denticetopsis seducta e Bujurquina syspilus. Nossos resultados contribuem para o conhecimento dos parâmetros do ciclo de vida de espécies de peixes do sudoeste da Amazônia.

Palavras-chave

riachos amazônicos; alometria; conservação; padrão de crescimento; isometria

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Submitted date:
03/14/2025

Accepted date:
10/02/2025

Publication date:
11/19/2025

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