Reproductive cycles of the southern banded guitarfish Zapteryx xyster and the Velez ray Raja velezi caught as bycatch in a bottom-trawl fishery

ABSTRACT The southern banded guitarfish, Zapteryx xyster, and the Velez ray, Raja velezi, are two endemic elasmobranchs in the eastern Tropical Pacific that are commonly caught by the bottom-trawl fishery. Reproductive cycles of these batoids were inferred from the hepatosomatic and gonadosomatic in...

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Autores principales:	Azofeifa-Solano,Juan Carlos, Clarke,Tayler M., Espinoza,Mario, Wehrtmann,Ingo S.
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2021
Materias:	Zapteryx xyster Raja velezi Batoidea reproductive cycle bottom-dwelling elasmobrachs eastern Tropical Pacific
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2021000100048
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spelling	oai:scielo:S0718-560X20210001000482021-03-22Reproductive cycles of the southern banded guitarfish Zapteryx xyster and the Velez ray Raja velezi caught as bycatch in a bottom-trawl fisheryAzofeifa-Solano,Juan CarlosClarke,Tayler M.Espinoza,MarioWehrtmann,Ingo S. Zapteryx xyster Raja velezi Batoidea reproductive cycle bottom-dwelling elasmobrachs eastern Tropical Pacific ABSTRACT The southern banded guitarfish, Zapteryx xyster, and the Velez ray, Raja velezi, are two endemic elasmobranchs in the eastern Tropical Pacific that are commonly caught by the bottom-trawl fishery. Reproductive cycles of these batoids were inferred from the hepatosomatic and gonadosomatic indexes (males and females) and the oviductal gland width and the yolk follicle diameter (females) of mature specimens collected along the Pacific of Costa Rica between 2010 and 2011. Z. xyster females have a partially defined annual cycle with one reproductive peak in June and July, with most neonates and gravid females occurring during December and January (beginning of the dry season). The gestation period of Z. xyster can range between four and six months; males are probably capable of mating continuously throughout the year. Females and males of R. velezi have a continuous reproductive cycle with no clear peaks. Management and conservation measures of these batoids should consider their reproductive ecology, which may be linked to the degree of vulnerability to fishing. Based on our findings, we recommend reducing fishing pressure when mating (June-July) and pupping (December-January) of Z. xyster occur. In contrast, a reduction of fishing pressure on previously identified nursery grounds of R. velezi in the southern Pacific of Costa Rica may benefit their population.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.49 n.1 20212021-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2021000100048en10.3856/vol49-issue1-fulltext-2558
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Zapteryx xyster Raja velezi Batoidea reproductive cycle bottom-dwelling elasmobrachs eastern Tropical Pacific
spellingShingle	Zapteryx xyster Raja velezi Batoidea reproductive cycle bottom-dwelling elasmobrachs eastern Tropical Pacific Azofeifa-Solano,Juan Carlos Clarke,Tayler M. Espinoza,Mario Wehrtmann,Ingo S. Reproductive cycles of the southern banded guitarfish Zapteryx xyster and the Velez ray Raja velezi caught as bycatch in a bottom-trawl fishery
description	ABSTRACT The southern banded guitarfish, Zapteryx xyster, and the Velez ray, Raja velezi, are two endemic elasmobranchs in the eastern Tropical Pacific that are commonly caught by the bottom-trawl fishery. Reproductive cycles of these batoids were inferred from the hepatosomatic and gonadosomatic indexes (males and females) and the oviductal gland width and the yolk follicle diameter (females) of mature specimens collected along the Pacific of Costa Rica between 2010 and 2011. Z. xyster females have a partially defined annual cycle with one reproductive peak in June and July, with most neonates and gravid females occurring during December and January (beginning of the dry season). The gestation period of Z. xyster can range between four and six months; males are probably capable of mating continuously throughout the year. Females and males of R. velezi have a continuous reproductive cycle with no clear peaks. Management and conservation measures of these batoids should consider their reproductive ecology, which may be linked to the degree of vulnerability to fishing. Based on our findings, we recommend reducing fishing pressure when mating (June-July) and pupping (December-January) of Z. xyster occur. In contrast, a reduction of fishing pressure on previously identified nursery grounds of R. velezi in the southern Pacific of Costa Rica may benefit their population.
author	Azofeifa-Solano,Juan Carlos Clarke,Tayler M. Espinoza,Mario Wehrtmann,Ingo S.
author_facet	Azofeifa-Solano,Juan Carlos Clarke,Tayler M. Espinoza,Mario Wehrtmann,Ingo S.
author_sort	Azofeifa-Solano,Juan Carlos
title	Reproductive cycles of the southern banded guitarfish Zapteryx xyster and the Velez ray Raja velezi caught as bycatch in a bottom-trawl fishery
title_short	Reproductive cycles of the southern banded guitarfish Zapteryx xyster and the Velez ray Raja velezi caught as bycatch in a bottom-trawl fishery
title_full	Reproductive cycles of the southern banded guitarfish Zapteryx xyster and the Velez ray Raja velezi caught as bycatch in a bottom-trawl fishery
title_fullStr	Reproductive cycles of the southern banded guitarfish Zapteryx xyster and the Velez ray Raja velezi caught as bycatch in a bottom-trawl fishery
title_full_unstemmed	Reproductive cycles of the southern banded guitarfish Zapteryx xyster and the Velez ray Raja velezi caught as bycatch in a bottom-trawl fishery
title_sort	reproductive cycles of the southern banded guitarfish zapteryx xyster and the velez ray raja velezi caught as bycatch in a bottom-trawl fishery
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2021
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2021000100048
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Reproductive cycles of the southern banded guitarfish Zapteryx xyster and the Velez ray Raja velezi caught as bycatch in a bottom-trawl fishery

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