Effects of salinity gradients on larval growth and otolith asymmetry of austral hake Merluccius australis

Abstract Austral hake Merluccius australis sustain an important demersal fishery in South Pacific and Atlantic oceans. The main spawning and nursery areas are in the Chilean Patagonia, which is characterized by large inputs of freshwater from rivers and ice melting. The spatial distribution of larva...

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Autores principales:	Landaeta,Mauricio F., Castillo-Hidalgo,Gissella, Bustos,Claudia A.
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2018
Materias:	ichthyoplankton otolith fluctuating asymmetry freshwater runoff Baker River larvae Chilean Patagonia
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2018000100212
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spelling	oai:scielo:S0718-560X20180001002122018-04-17Effects of salinity gradients on larval growth and otolith asymmetry of austral hake Merluccius australisLandaeta,Mauricio F.Castillo-Hidalgo,GissellaBustos,Claudia A. ichthyoplankton otolith fluctuating asymmetry freshwater runoff Baker River larvae Chilean Patagonia Abstract Austral hake Merluccius australis sustain an important demersal fishery in South Pacific and Atlantic oceans. The main spawning and nursery areas are in the Chilean Patagonia, which is characterized by large inputs of freshwater from rivers and ice melting. The spatial distribution of larval austral hake M. australis was studied during spring, and the potential effects of oceanographic conditions (temperature, salinity, vertical stability and turbidity) on early life traits, derived from sagitta otolith microstructure analysis, size-at-age (SAR), individual larval growth (IGR) and bilateral asymmetry (FA6). Larval abundance ranged between 0.86 and 41.55 ind 1000 m-3 (median: 4.08 ind 1000 m-3) and population larval growth estimated by micro-increment counts of sagitta otoliths was 0.129 ± 0.010 mm d-1, with age varying from 4 to 24 days old. All three indicators derived from otolith analysis (SAR, IGR, and FA6) showed positive and significant correlations with vertical salinity gradients; IGR and FA6 were also positively correlated to Brunt-Väisälä frequency (vertical stability) and FA6 was correlated to turbidity. Therefore, larval M. australis were larger-at-age, grew faster and showed more asymmetry in areas with more influence of freshwater runoff in south Pacific Patagonia.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.46 n.1 20182018-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2018000100212en10.3856/vol46-issue1-fulltext-20
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	ichthyoplankton otolith fluctuating asymmetry freshwater runoff Baker River larvae Chilean Patagonia
spellingShingle	ichthyoplankton otolith fluctuating asymmetry freshwater runoff Baker River larvae Chilean Patagonia Landaeta,Mauricio F. Castillo-Hidalgo,Gissella Bustos,Claudia A. Effects of salinity gradients on larval growth and otolith asymmetry of austral hake Merluccius australis
description	Abstract Austral hake Merluccius australis sustain an important demersal fishery in South Pacific and Atlantic oceans. The main spawning and nursery areas are in the Chilean Patagonia, which is characterized by large inputs of freshwater from rivers and ice melting. The spatial distribution of larval austral hake M. australis was studied during spring, and the potential effects of oceanographic conditions (temperature, salinity, vertical stability and turbidity) on early life traits, derived from sagitta otolith microstructure analysis, size-at-age (SAR), individual larval growth (IGR) and bilateral asymmetry (FA6). Larval abundance ranged between 0.86 and 41.55 ind 1000 m-3 (median: 4.08 ind 1000 m-3) and population larval growth estimated by micro-increment counts of sagitta otoliths was 0.129 ± 0.010 mm d-1, with age varying from 4 to 24 days old. All three indicators derived from otolith analysis (SAR, IGR, and FA6) showed positive and significant correlations with vertical salinity gradients; IGR and FA6 were also positively correlated to Brunt-Väisälä frequency (vertical stability) and FA6 was correlated to turbidity. Therefore, larval M. australis were larger-at-age, grew faster and showed more asymmetry in areas with more influence of freshwater runoff in south Pacific Patagonia.
author	Landaeta,Mauricio F. Castillo-Hidalgo,Gissella Bustos,Claudia A.
author_facet	Landaeta,Mauricio F. Castillo-Hidalgo,Gissella Bustos,Claudia A.
author_sort	Landaeta,Mauricio F.
title	Effects of salinity gradients on larval growth and otolith asymmetry of austral hake Merluccius australis
title_short	Effects of salinity gradients on larval growth and otolith asymmetry of austral hake Merluccius australis
title_full	Effects of salinity gradients on larval growth and otolith asymmetry of austral hake Merluccius australis
title_fullStr	Effects of salinity gradients on larval growth and otolith asymmetry of austral hake Merluccius australis
title_full_unstemmed	Effects of salinity gradients on larval growth and otolith asymmetry of austral hake Merluccius australis
title_sort	effects of salinity gradients on larval growth and otolith asymmetry of austral hake merluccius australis
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2018000100212
work_keys_str_mv	AT landaetamauriciof effectsofsalinitygradientsonlarvalgrowthandotolithasymmetryofaustralhakemerlucciusaustralis AT castillohidalgogissella effectsofsalinitygradientsonlarvalgrowthandotolithasymmetryofaustralhakemerlucciusaustralis AT bustosclaudiaa effectsofsalinitygradientsonlarvalgrowthandotolithasymmetryofaustralhakemerlucciusaustralis
_version_	1714205196367691776

Effects of salinity gradients on larval growth and otolith asymmetry of austral hake Merluccius australis

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