Population structure and reproductive biology of the scalloped hammerhead Sphyrna lewini (Carcharhiniformes: Sphyrnidae) caught in artisanal fisheries of Oaxaca, Mexico

Authors

  • María Del Carmen Alejo Plata Universidad del Mar, Campus Puerto Ángel, Ciudad Universitaria, San Pedro Pochutla, Oaxaca.
  • Miguel Angel Ahumada-Sempoal
  • Genoveva Cerdenares Ladrón de Guevara
  • José Luis Gómez-Márquez

DOI:

https://doi.org/10.24275/uam/izt/dcbs/hidro/2018v28n3/Alejo

Keywords:

artisanal fishery, embryos, Gulf of Tehuantepec, neonates, sexual maturity

Abstract

Background: Sphyrna lewini, is a semi-oceanic and cosmopolitan species globally distributed throughout tropical and warm temperate seas. In the northeastern tropical Pacific, this specie represents an important contribution to the biomass of artisanal and small-scale fisheries. Goals: In this study the aim was to obtain information about length frequency distribution and reproductive aspects of S. lewini, in Oaxaca, Mexico. Methods: Samples were taken from August 2001 to December 2007 in four landing sites of the artisanal fleet on the coast of Oaxaca. Results: Samples were collected 388 females and 434 males. Total length ranged from 44-308 cm for males and from 44-332 cm for females. The catches were made up of neonates (24.3%, 44-74 cm), juveniles (42.2%, 75-170 cm) and adults (33.5%, > 170 cm). The sex ratio shows differences by size, and season. The greatest catches were recorded in the rainy season (85.5%), with a predominance of juveniles and adults, and a higher proportion of males. In the dry season (15.5%) were recorded with a predominance of larger sizes >100 cm in both sexes. The females reached sexual maturity (TL50) at 198.8 cm and the males at 181 cm, based on characteristics and measurements of reproductive organs. A total of 37 gravid females with sizes between 175 and 281 cm were registered, from April to August. Gravid females had between 15-42 embryos, varying from 44-54 cm. Conclusion: S. lewini was present year round in the study area with the greatest catch from April to September, the season when pregnant females were present. 

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Published

2018-12-03

How to Cite

Alejo Plata, M. D. C., Ahumada-Sempoal, M. A., Cerdenares Ladrón de Guevara, G., & Gómez-Márquez, J. L. (2018). Population structure and reproductive biology of the scalloped hammerhead Sphyrna lewini (Carcharhiniformes: Sphyrnidae) caught in artisanal fisheries of Oaxaca, Mexico. HIDROBIOLÓGICA, 28(3). https://doi.org/10.24275/uam/izt/dcbs/hidro/2018v28n3/Alejo

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