Size structure, age, and diets of introduced Chinook salmon (Oncorhynchus tshawytscha) inhabiting the Palena River, Chilean Patagonia

ABSTRACT Chinook salmon (Oncorhynchus tshawytscha) were recorded in two extensive areas during a survey conducted between February 2012 and June 2013 to obtain information regarding the seasonal distribution and population structure of a self-sustained salmonid population inhabiting the Palena River...

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Autores principales:	Bravo,Sandra, Silva,María T., Ciancio,Javier, Whelan,Ken
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2019
Materias:	invasive salmon spawning migration population structure feeding habits recreational fishing Chilean Patagonia
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2019000100129
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spelling	oai:scielo:S0718-560X20190001001292019-03-27Size structure, age, and diets of introduced Chinook salmon (Oncorhynchus tshawytscha) inhabiting the Palena River, Chilean PatagoniaBravo,SandraSilva,María T.Ciancio,JavierWhelan,Ken invasive salmon spawning migration population structure feeding habits recreational fishing Chilean Patagonia ABSTRACT Chinook salmon (Oncorhynchus tshawytscha) were recorded in two extensive areas during a survey conducted between February 2012 and June 2013 to obtain information regarding the seasonal distribution and population structure of a self-sustained salmonid population inhabiting the Palena River. A total of 83 Chinook salmon were captured, which corresponded to 8.3% of the total salmonids collected in both areas. Juveniles of less than 15 cm were recorded in the upstream section of the river, from which fry-parr were less than 5 cm, and pre-smolt ranged between 5 and 10 cm aged 0+. Smolts displaying the characteristic silver coloration with an absence of parr-markings ranged between 10 and 15 cm and were aged 1+. The diet of the juvenile salmon was composed mainly of aquatic insects. Mature salmon returning from the ocean were collected in the middle section of the river, with weights ranging between 4.6 and 28 kg and their age ranged from 4+ to 6+ years in the ocean, plus 1+ year's growth in freshwater (stream type ecotype). All the adult salmon were devoid of food. Immature adults, with ages between 3+ and 4+, were collected from a small lake (Claro Solar), displayed a piscivorous diet mainly based on native Galaxid species. Adult salmon returning from the ocean were infested with the cestode Hepatoxylon trichuri, attached to the pyloric caeca.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.47 n.1 20192019-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2019000100129en10.3856/vol47-issue1-fulltext-14
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	invasive salmon spawning migration population structure feeding habits recreational fishing Chilean Patagonia
spellingShingle	invasive salmon spawning migration population structure feeding habits recreational fishing Chilean Patagonia Bravo,Sandra Silva,María T. Ciancio,Javier Whelan,Ken Size structure, age, and diets of introduced Chinook salmon (Oncorhynchus tshawytscha) inhabiting the Palena River, Chilean Patagonia
description	ABSTRACT Chinook salmon (Oncorhynchus tshawytscha) were recorded in two extensive areas during a survey conducted between February 2012 and June 2013 to obtain information regarding the seasonal distribution and population structure of a self-sustained salmonid population inhabiting the Palena River. A total of 83 Chinook salmon were captured, which corresponded to 8.3% of the total salmonids collected in both areas. Juveniles of less than 15 cm were recorded in the upstream section of the river, from which fry-parr were less than 5 cm, and pre-smolt ranged between 5 and 10 cm aged 0+. Smolts displaying the characteristic silver coloration with an absence of parr-markings ranged between 10 and 15 cm and were aged 1+. The diet of the juvenile salmon was composed mainly of aquatic insects. Mature salmon returning from the ocean were collected in the middle section of the river, with weights ranging between 4.6 and 28 kg and their age ranged from 4+ to 6+ years in the ocean, plus 1+ year's growth in freshwater (stream type ecotype). All the adult salmon were devoid of food. Immature adults, with ages between 3+ and 4+, were collected from a small lake (Claro Solar), displayed a piscivorous diet mainly based on native Galaxid species. Adult salmon returning from the ocean were infested with the cestode Hepatoxylon trichuri, attached to the pyloric caeca.
author	Bravo,Sandra Silva,María T. Ciancio,Javier Whelan,Ken
author_facet	Bravo,Sandra Silva,María T. Ciancio,Javier Whelan,Ken
author_sort	Bravo,Sandra
title	Size structure, age, and diets of introduced Chinook salmon (Oncorhynchus tshawytscha) inhabiting the Palena River, Chilean Patagonia
title_short	Size structure, age, and diets of introduced Chinook salmon (Oncorhynchus tshawytscha) inhabiting the Palena River, Chilean Patagonia
title_full	Size structure, age, and diets of introduced Chinook salmon (Oncorhynchus tshawytscha) inhabiting the Palena River, Chilean Patagonia
title_fullStr	Size structure, age, and diets of introduced Chinook salmon (Oncorhynchus tshawytscha) inhabiting the Palena River, Chilean Patagonia
title_full_unstemmed	Size structure, age, and diets of introduced Chinook salmon (Oncorhynchus tshawytscha) inhabiting the Palena River, Chilean Patagonia
title_sort	size structure, age, and diets of introduced chinook salmon (oncorhynchus tshawytscha) inhabiting the palena river, chilean patagonia
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2019
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2019000100129
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Size structure, age, and diets of introduced Chinook salmon (Oncorhynchus tshawytscha) inhabiting the Palena River, Chilean Patagonia

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