Fishing biology of lumptail searobin, Prionotus stephanophrys (Lockington, 1880) from the multi-purpose fishing fleet during 2017 and 2018 in Ecuador
Acuicultura y Pesca
DOI:
https://doi.org/10.33936/latecnica.v14i1.6292Keywords:
lumptail searobin; Prionotus stephanophrys; bycatch; gonadosomatic index; sexual maturity.Abstract
The lumptail searobin (Prionotus stephanophrys Lockington 1881) is one of the most captured species as part of the bycatch in hake fishing operations; therefore, this research analyzed the size-weight relationship, gonadosomatic index, and size at sexual maturity of 622 individuals incidentally captured by the polyvalent fishing fleet between 2017 and 2018 in the Ecuadorian coast, where it was observed that the most frequent lengths were 27-28 cm TL for both sexes, with an average length for females of 27.73 ± 2.88 cm LT and for males of 26.78 ± 2.51 cm LT; however, in general, no significant differences were found in size structure in combined years (P>0.05). Additionally, the estimated size at sexual maturity was 20.22 cm; therefore, it is considered that all incidentally captured individuals are above sexual maturity, with only 3.86% below it. The total length-total weight relationship showed for the species a negative allometric growth; meanwhile, the gonadosomatic index established that the reproductive season corresponds from march to november, and from april to may is resting season. The highest incidental capture of individuals, especially females, coincided with the peak of reproductive intensity, with a sex ratio F:M of 1.5:1.
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