Reproductive characteristics of the sole Achirus mazatlanus (Pleuronectiformes: Achiridae) in the Barra de Navidad coastal lagoon, Jalisco, Mexico

Abstract

is one of the most widely distributed and abundant soles occurring on the Pacific coast of Mexico, yet most of its biological and reproductive characteristics are unknown. Weekly and monthly samples were collected in the Barra de Navidad coastal lagoon (Jalisco, Mexico) from February 2011 to August 2016 to assess the reproductive biology of this species. Observed total sex ratio (F1.00:M1.03) was not significantly different from the expected 1:1 ratio. Females were, on average, larger than males. The observed monthly gonadosomatic index, percentage of mature gonads, mean oocyte diameter, and ovarian-wall thickness suggest that the species reproduces year-round, with an important reproductive season lasting from April to August. Females were classified as partial spawners with asynchronous oocyte development, and males showed unrestricted spermatogonial testes. The presence of spawned individuals and hydrated oocytes in certain months indicates that the species could be spawning in the lagoon; however, the occurrence of eggs and larvae needs to be demonstrated to ascertain this statement. This was the first time length at sexual maturity was assessed for female (10.84 cm) and male (10.23 cm) A. mazatlanus.

Influencia del sustrato en la composición de la ictiofauna en zonas someras de la laguna costera Barra de Navidad, México

“…Se estimó el porcentaje de individuos que estaban por debajo de la longitud de maduración y se consideró que se encontraban en estadio juvenil. La longitud de maduración y el tipo de alimentación de las especies principales incluidas en esta investigación se obtuvieron de la base de datos en línea Fishbase (Froese & Pauly, 2019) y de literatura científica (Piñón, Amezcua, & Duncan, 2009;Lucano-Ramírez, Ruiz-Ramírez, González-Sansón, & Ceballos-Vázquez, 2014;Aguilar-Betancourt et al, 2016;Ruiz-Ramírez, et al, 2017;Lucano-Ramírez et al, 2019).…”

Reproductive biology of Heteropneustes fossilis in a wetland ecosystem (Gajner Beel, Bangladesh) in relation to eco-climatic factors: Suggesting a sustainable policy for aquaculture, management and conservation

“…As a widely used tool for fisheries biologists and managers, careful estimation of the maturity status of fish, helps to ensure proper assessment and management of exploited stocks ( Rahman et al, 2018 ). Nevertheless, the size at sexual maturity and spawning season of fish were estimated by several models including brooding of eggs over time, appearance of ovary and maturation stages over time ( King, 2007 ), relative weight of gonad (TL vs. gonadosomatic index, modified gonadosomatic index and dobriyal index) over time ( Hossain et al, 2017a , Ahamed et al, 2018 , Khatun et al, 2019 ) and histological analyses ( Chelemal et al, 2009 , Lucano-Ramírez et al, 2019 , Jan and Ahmed, 2019 ). Though histological analyses of gonads is the best way of assessing maturity, where the facilities are lacking, other biotic parameters can easily be measured as indicators of maturity status, ( West, 1990 , Lowerre-Barbieri et al, 2011 , Khatun et al, 2019 ).…”