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Length–weight and length–length relationships, gonadosomatic indices and size at first maturity of E ugerres mexicanus ( S teindachner, 1863) ( P ercoidei: G erreidae) from the U sumacinta R iver, M exico
Author(s) -
ValdezZenil J.,
RodilesHernández R.,
GonzálezAcosta A. F.,
MendozaCarranza M.,
Barba Macías E.
Publication year - 2014
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.12267
Subject(s) - gonadosomatic index , biology , sexual maturity , maturity (psychological) , reproductive biology , sex ratio , zoology , fishery , ecology , population , demography , fecundity , psychology , developmental psychology , embryo , sociology , embryogenesis
Summary This study examines the length‐weight ( L ‐ W ) and length‐length ( L ‐ L ) relationships, gonadosomatic indices, and size at sexual maturity for individuals of the endemic Mexican mojarra, E ugerres mexicanus ( S teindachner, 1863) from the U sumacinta R iver B asin, T abasco, M exico. From A pril 2008 to J anuary 2010, 360 specimens were examined, including 151 (41.9%) male, 179 (49.7%) female and 30 unsexed (8.3%) individuals. Overall female:male ratio was 1.2 : 1. Gonadosomatic index ( GSI ) values indicate increased reproductive activity during F ebruary, with significant differences between males ( GSI = 2.07) and females ( GSI = 5.48). The mean size at first maturity ( L 50 ) was 17.3 cm TL for males and 20.5 cm TL for females.