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Acta Limnologica Brasiliensia
Acta Limnologica Brasiliensia
Short Research Note

Length-weight relationships of native and non-native fishes in a subtropical coastal river of the Atlantic Rain Forest

Relação peso-comprimento de espécies nativas e não nativas de um rio subtropical da Mata Atlântica

Barbara Maichak de Carvalho; Larissa Faria; Natali Oliva Roman Miiller; Henry Louis Spach; Jean Ricardo Simões Vitule

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Abstract: Aim: The objective was to describe the LWR of fish species of the Guaraguaçu River, as well as to compare the LWR parameters of the non-native species with the parameters obtained in their native ranges, available in the literature.

Methods: In this study, the LWR of 10 fish species of the Guaraguaçu River, southern Brazil, were analyzed. Fish were sampled semiannually between 2004 and 2007, using different sampling techniques in the Guaraguaçu River.

Results: A total of 673 specimens of 10 species were captured. The LWR demonstrated a prevalence of species (six out of 10) with positive allometric growth (b > 3). The remaining species presented isometric (b = 3, two species) or negative growth (b < 3, two species). Native species exhibited the same LWR from previous studies, except Centropomus parallelus, which presented an isometric growth in this study. The non-native species Clarias gariepinus and Ictalurus punctatus showed significant differences between the LWR parameters in the Guaraguaçu River and in their native distribution, but the same growth pattern. Oreochromis niloticus did not present significant differences in the allometric coefficient from its native range.

Conclusions: These results indicate that different environmental conditions may not influence the growth pattern of non-native species, which explains their invasion success due to high adaptability to new environments.


alien species, Atlantic Rain Forest, fisheries, ichthyofauna, length-weight relationships


Resumo: Objetivo: O objetivo foi descrever os parâmetros LWR das espécies nativas e não nativas do rio Guaraguaçu e comparar esses parâmetros das espécies não nativas obtidos no rio Guaraguaçu com os parâmetros de LWR dos seus locais de distribuição nativa disponível na literatura.

Métodos: Os exemplares foram coletados semestralmente entre 2004 e 2007, usando diferentes técnicas de amostragens.

Resultados: No total, foram analisados 673 exemplares de 10 espécies. Seis espécies apresentaram alometria positiva (b>3) e três alometria negativa (b<3) e isometria (b=3). Espécies nativas possuem parâmetros de LWR idênticos a estudos prévios, exceto Centropomus parallelus, a qual apresentou isometria neste estudo. As espécies não nativas Clarias gariepinus e Ictalurus punctatus demonstraram diferenças significativas entre os parâmetros de LWR do Guaraguaçu e das suas áreas de distribuição nativa. Oreochromis niloticus não apresentou diferença significativa entre os parâmetros de LWR entre o Guaraguaçu e sua área nativa de distribuição.

Conclusões: O resultado indica que as condições ambientais talvez não influenciem o crescimento das espécies não nativas, o que explicaria o sucesso de invasão destas espécies.


espécies exóticas, Floresta Atlântica, pesca, ictiofauna, relação peso-comprimento


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