| Registro completo |
| Provedor de dados: |
Zoologia
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| País: |
Brazil
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| Título: |
Indicadores reprodutivos de Parauchenipterus striatulus (Steindachner) (Pisces, Auchenipteridae) na Represa de Ribeirão das Lajes, Rio de Janeiro, Brasil
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| Autores: |
Araújo,Francisco Gerson
Duarte,Silvana
Goldberg,Rubens Sterental
Fichberg,Liana
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| Data: |
1999-01-01
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| Ano: |
1999
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| Palavras-chave: |
Auchenipteridae
Length-weight relationship
Reproduction
Condition factor
Gonadosomatic index
Reservoir
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| Resumo: |
Parauchenipterus striatulus is a representative of the freshwater catfish with wide distribution in the South America region. Despite of being a very abundant fish in rivers and reservoirs of this region, little is known about its biology and ecology. In Ribeirão das Lajes reservoir (22º42'S - 22º50'S, 43º53'- 44º05' W, Rio de Janeiro), the Rio de Janeiro state's largest hydroelectric reservoir, this species is very abundant, representing about 40% of the total experimental fish catches using gill nets. This paper aims to assess aspects of the reproductive cycle of this species describing the gonadal stages, gonadosomatic index, weight-length relationship and condition factor. Fish sampling were carried out bi-monthly, between April 1996 and May 1997. Gill nets used were 100 m long, 4 m high with mesh size between 25 and 65 mm. Macroscopic analysis of 339 individuais were performed for the determination of 5 maturation stages, for both sexes (immature, maturation I, maturation II, ripe, spawned (females) and emptied (males). The gonadosomatic index for both sexes was higher from October to March, suggesting a long spawning period while the condition factor was higher from February to June, showing an inverse relationship between these two parameters. Weight-length relationship for males was W=0,0095L3,C862and for females W= 0,0116L3,126, and no significam differences were shown between sex with reference to the alometry coefficient.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Português
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000400016
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| Editor: |
Sociedade Brasileira de Zoologia
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| Relação: |
10.1590/S0101-81751999000400016
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| Formato: |
text/html
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| Fonte: |
Revista Brasileira de Zoologia v.16 n.4 1999
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| Direitos: |
info:eu-repo/semantics/openAccess
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