Reproductive biology of the freshwater drum Aplodinotus grunniens in Tabasco, Mexico/Biología reproductiva del tambor de agua dulce Aplodinotus grunniens en Tabasco, México
2017
Raúl Enrique Hernández-Gómez | Wilfrido Miguel Contreras-Sánchez | Martha Alicia Perera-García
Aplodinotus grunniens supports a sustained artisanal shery in the Usumacinta River; however, there arefew studies to understand the population dynamics of the species. Relevant aspects of the reproductive biology weredocumented over an annual cycle, using 593 specimens captured with seine nets. The results indicate that femaleshad a median TL of 32.05 cm, while males had 29.71 cm. The estimated sex ratio was 1.2:1 (males: females). Thelength-weight relationship showed signicant dierence between sexes, observing an allometric-type growth representedby TW=0.0013(TL)3.5985 with 89.17 % of the data variability explained by the model. Gonadosomatic index (GSI)in females was higher in September (4.29), with males displaying a higher GSI in October (1.02). The highest HSIincrease in females was observed in October (1.0). The estimated relative fecundity was 138.74 (± 74.30) oocytes/gof female weight. The macroscopic analysis of gonads indicates that the highest frequency of mature females occursin June (75 %), while in males it takes place in March and June (35 %). The estimated L50 for females was 31.89 cm(TL) and 28.78 cm (TL) for males. Though A. grunniens reproduces throughout the year, reproductive peaks coincidewith the period when the river level decreases, and shing increases considerably. Hence, preventive measures must beapplied in regards to the size of the species at capture and the exploitation volumes of this resource.
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