Species catch composition, length structure and reproductive indices of swordfish (Xiphias gladius) at Easter Island zone

The species composition, size distribution, and gonadal index (GI) of swordfish (Xiphias gladius) are reported from catches obtained by longliners in the zone of Easter Island in the southeastern Pacific. Five cruises were made during the summer season between 2001 and 2006 completing a total of 150...

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Autores principales:	Vega,Rodrigo, Licandeo,Roberto, Rosson,Gastón, Yáñez,Eleuterio
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2009
Materias:	Xiphias gladius swordfish gonadal index species composition Easter Island southeastern Pacific
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000100007
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spelling	oai:scielo:S0718-560X20090001000072009-04-22Species catch composition, length structure and reproductive indices of swordfish (Xiphias gladius) at Easter Island zoneVega,RodrigoLicandeo,RobertoRosson,GastónYáñez,Eleuterio Xiphias gladius swordfish gonadal index species composition Easter Island southeastern Pacific The species composition, size distribution, and gonadal index (GI) of swordfish (Xiphias gladius) are reported from catches obtained by longliners in the zone of Easter Island in the southeastern Pacific. Five cruises were made during the summer season between 2001 and 2006 completing a total of 150 fishing sets. A total of 3,781 fish belonging to 24 species were registered, of which 17 were commercial and 6 were bycatch. Of the total, 44.1%) were swordfish, 28.3%> sharks, 12.1% marlins, 8.4%> tunas and 7.1%o other teleosts. Amongst the sharks the most important species was the blue shark (Prionace glauca, 16.5%>) followed by the brown shark (Carcharhinus spp., 6.9%>). Amongst the tunas and istiophorids, striped marlin (Tetrapturus audax, 8.0%) and yellowfin tuna (Thunnus albacares, 4.9%) were also important (≥ 4% in number). The number of units by species, the nominal yield in number and weight and the gutted average weight are reported in addition to size statistics. The population structure of swordfish was dominated by males and differences in the average length between sexes were not found. Individuals with high values of GI were observed during every survey, mainly during December-February which suggests a reproductive area for this species. The blue shark showed a predominance of males, and differences in the average length between sexes were observed, possibly due to a spatial and temporal segregation.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.37 n.1 20092009-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000100007en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Xiphias gladius swordfish gonadal index species composition Easter Island southeastern Pacific
spellingShingle	Xiphias gladius swordfish gonadal index species composition Easter Island southeastern Pacific Vega,Rodrigo Licandeo,Roberto Rosson,Gastón Yáñez,Eleuterio Species catch composition, length structure and reproductive indices of swordfish (Xiphias gladius) at Easter Island zone
description	The species composition, size distribution, and gonadal index (GI) of swordfish (Xiphias gladius) are reported from catches obtained by longliners in the zone of Easter Island in the southeastern Pacific. Five cruises were made during the summer season between 2001 and 2006 completing a total of 150 fishing sets. A total of 3,781 fish belonging to 24 species were registered, of which 17 were commercial and 6 were bycatch. Of the total, 44.1%) were swordfish, 28.3%> sharks, 12.1% marlins, 8.4%> tunas and 7.1%o other teleosts. Amongst the sharks the most important species was the blue shark (Prionace glauca, 16.5%>) followed by the brown shark (Carcharhinus spp., 6.9%>). Amongst the tunas and istiophorids, striped marlin (Tetrapturus audax, 8.0%) and yellowfin tuna (Thunnus albacares, 4.9%) were also important (≥ 4% in number). The number of units by species, the nominal yield in number and weight and the gutted average weight are reported in addition to size statistics. The population structure of swordfish was dominated by males and differences in the average length between sexes were not found. Individuals with high values of GI were observed during every survey, mainly during December-February which suggests a reproductive area for this species. The blue shark showed a predominance of males, and differences in the average length between sexes were observed, possibly due to a spatial and temporal segregation.
author	Vega,Rodrigo Licandeo,Roberto Rosson,Gastón Yáñez,Eleuterio
author_facet	Vega,Rodrigo Licandeo,Roberto Rosson,Gastón Yáñez,Eleuterio
author_sort	Vega,Rodrigo
title	Species catch composition, length structure and reproductive indices of swordfish (Xiphias gladius) at Easter Island zone
title_short	Species catch composition, length structure and reproductive indices of swordfish (Xiphias gladius) at Easter Island zone
title_full	Species catch composition, length structure and reproductive indices of swordfish (Xiphias gladius) at Easter Island zone
title_fullStr	Species catch composition, length structure and reproductive indices of swordfish (Xiphias gladius) at Easter Island zone
title_full_unstemmed	Species catch composition, length structure and reproductive indices of swordfish (Xiphias gladius) at Easter Island zone
title_sort	species catch composition, length structure and reproductive indices of swordfish (xiphias gladius) at easter island zone
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000100007
work_keys_str_mv	AT vegarodrigo speciescatchcompositionlengthstructureandreproductiveindicesofswordfishxiphiasgladiusateasterislandzone AT licandeoroberto speciescatchcompositionlengthstructureandreproductiveindicesofswordfishxiphiasgladiusateasterislandzone AT rossongaston speciescatchcompositionlengthstructureandreproductiveindicesofswordfishxiphiasgladiusateasterislandzone AT yanezeleuterio speciescatchcompositionlengthstructureandreproductiveindicesofswordfishxiphiasgladiusateasterislandzone
_version_	1714205061285937152

Species catch composition, length structure and reproductive indices of swordfish (Xiphias gladius) at Easter Island zone

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