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Effective fisheries management depend on having an exact assessment of biological parameters, including growth parameters, reproduction, size at sexual maturity ( L  m ), and stock assessment. The purpose of this research was to estimate the size at sexual maturity ( L  m ) for 20 fish species belongs to 14 families from a wetland (Gajner  Beel ) ecosystem in the north-western ( NW ) Bangladesh through multi-models such as length ( L  max ) based empirical model, gonadosomatic index ( GSI )-based model, and logistic model using commercial catches from January to December 2018. Also, we assessed the  L  m  in other water-bodies worldwide. Specimens’ total length ( TL ) was noted up to 0.1 cm using measuring board body weight ( BW ) and gonad weight ( GW ) weighed by digital electronic balance with 0.01 g accuracy. To assess the  L  m , maximum body length ( L  max ) based empirical model; the relation between  TL  (total length in cm) vs.  GSI  (gonadosomatic index in %); and a logistic model were considered. The minimum  L  m  was 4.64, 3.90, and 4.15 cm for    Chanda   nama    Hamilton, 1822 and the maximum was 25.33, 24.50, and 24.70 cm for    Channa   striata    (Bloch, 1793) through  L  max ,  GSI , and logistic-based models, respectively. From these three models, the minimum mean  L  m  was 4.23 cm for    C.   nama    and the maximum was 24.84 cm for    C.   striata   . The  L  m  with 50.0% species was in 8.80 cm  TL . We also calculated the  L  m  from different bodies of water based on  L  max . This study was generated data of 17 new  L  m  among 20 species, which are globally absent. Therefore, the study will help develop sustainable management strategies, conservation through the implementation of mesh size based on the size at sexual maturity ( L  m ).

acta ichthyologica et piscatoria

Evaluating the size at sexual maturity for 20 fish species (  Actinopterygii  ) in wetland (Gajner   Beel  ) ecosystem, north-western Bangladesh through multi-model approach: A key for sound management