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Periodic life history strategy of Psectrogaster rutiloides , Kner 1858, in the Iquitos region, Peruvian Amazon
Author(s) -
GarcíaVásquez A.,
Vargas G.,
Sánchez H.,
Tello S.,
Duponchelle F.
Publication year - 2015
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/jai.12974
Subject(s) - biology , amazon rainforest , fecundity , sexual maturity , demography , fish <actinopterygii> , amazon basin , wet season , life history , ecology , zoology , fishery , population , sociology
Summary The present study objective was to determine some of the main life history characteristics of the chiochio, Psectrogaster rutiloides , a heavily fished, yet poorly studied species of the Peruvian Amazon. Over an annual cycle between 2006 and 2007 a monthly sampling of P. rutiloides on the Iquitos market provided a total of 2973 individuals. The species reproduces during the rainy season, during the first part of the flooding period. First sexual maturity is reached at about 2 years of age and 95 mm standard length ( SL ) for both males and females. Batch fecundity was related to fish size and varied from 59 800 to 149 100 oocytes, with oocytes diameters of 1.34 ± 0.11 mm, valid for females of 141 and 152 mm SL and of 102.9 and 149.6 g body mass, respectively. Females grew faster than males in every age class, a difference gradually increasing from 7% at age one to 10% at age nine, which corresponded to the oldest individuals sampled. Estimated mortality parameters and exploitation rates suggested over‐exploitation of the species in the Loreto region.