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Reproduction of the duck catfish Ageneiosus ucayalensis in a ria river system
Author(s) -
Oliveira V. A.,
Ferreira M. A. P.,
Rocha R. M.,
Montag L. F. A.
Publication year - 2017
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.13209
Subject(s) - catfish , biology , gonad , reproduction , sexual maturity , wet season , seasonal breeder , zoology , development of the gonads , sex ratio , amazon rainforest , fishery , ecology , fish <actinopterygii> , anatomy , demography , population , sociology
A total of 1006 duck catfish Ageneiosus ucayalensis were collected from a ria river system of eastern Amazonia, of which 733 were females and 273 males, a sex ratio 2·69:1. Condition factors of males were higher than those of females and size at first sexual maturity ( L 50 ) was 12·8 cm for females and 11·8 cm for males. The relative frequency of mature specimens and gonad condition indices indicate that the breeding season is short and coincides with the rainy season.