Spawning and early nursery areas of anchoveta Engraulis ringens Jenyns, 1842 in fjords of southern Chile

The anchoveta, Engraulis ringens, has shown fluctuations of their abundance and distribution at interdecadal scale along the South Pacific. However, the recent spatial and temporal variability of the reproductive events are unknown in their southernmost geographic distribution. Therefore, the spatia...

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Autores principales:	Bustos,Claudia A, Landaeta,Mauricio F, Balbontín,Fernando
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2008
Materias:	Ichthyoplankton stratification inland sea
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000200014
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spelling	oai:scielo:S0718-195720080002000142009-01-27Spawning and early nursery areas of anchoveta Engraulis ringens Jenyns, 1842 in fjords of southern ChileBustos,Claudia ALandaeta,Mauricio FBalbontín,Fernando Ichthyoplankton stratification inland sea The anchoveta, Engraulis ringens, has shown fluctuations of their abundance and distribution at interdecadal scale along the South Pacific. However, the recent spatial and temporal variability of the reproductive events are unknown in their southernmost geographic distribution. Therefore, the spatial and temporal variability in the spawning of E. ringens in the fjord region of southern Chile between 1995 and 2005 was analysed. The ichthyoplankton samples collected in the inland sea of southern Chile between 42ºS and 47ºS during 1995-2005 with Bongo nets showed an increase in the mean abundance of anchoveta eggs, varying from mean values of 38 eggs per 10 m² during October 1995 to >14,000 eggs per 10 m² during November 2005. Moreover, comparing our data with previously published information on anchoveta egg size along Chile (Llanos-Rivera & Castro 2004), the eggs collected during November 2005 in the inland sea were larger, wider and with higher volume than eggs collected from northern and central Chile. In the inland sea during November 2005, the anchoveta spawning was located mainly inside deep fjords (Comau and Reloncavi fjords); in such deep fjords abundance of both, eggs and preflexion larvae (i.e., <9 mm) were higher (>5,000 eggs per 10 m²; up to 2,178 larvae per 10 m², respectively) than at shallow waters of Chiloe Island (<100 eggs per 10 m²; up to 65 larvae per 10 m²). Additionally, postflexion larvae (i.e., >9 mm larval length) were collected exclusively in the fjord region (10_505 larvae per 10 m²). The Brunt-Väisälä frequency (N²) showed positively significant correlations with anchoveta eggs and larvae abundance, meaning that higher abundance of both eggs and larvae were collected in areas with more stable water columns. This stability may induce higher survival rates of early life stages of anchoveta and may be related with the recent increasing in the landings of other small pelagic fishes such as the Falkland sprat (Sprattus fuegensis).info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.43 n.2 20082008-08-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000200014en10.4067/S0718-19572008000200014
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Ichthyoplankton stratification inland sea
spellingShingle	Ichthyoplankton stratification inland sea Bustos,Claudia A Landaeta,Mauricio F Balbontín,Fernando Spawning and early nursery areas of anchoveta Engraulis ringens Jenyns, 1842 in fjords of southern Chile
description	The anchoveta, Engraulis ringens, has shown fluctuations of their abundance and distribution at interdecadal scale along the South Pacific. However, the recent spatial and temporal variability of the reproductive events are unknown in their southernmost geographic distribution. Therefore, the spatial and temporal variability in the spawning of E. ringens in the fjord region of southern Chile between 1995 and 2005 was analysed. The ichthyoplankton samples collected in the inland sea of southern Chile between 42ºS and 47ºS during 1995-2005 with Bongo nets showed an increase in the mean abundance of anchoveta eggs, varying from mean values of 38 eggs per 10 m² during October 1995 to >14,000 eggs per 10 m² during November 2005. Moreover, comparing our data with previously published information on anchoveta egg size along Chile (Llanos-Rivera & Castro 2004), the eggs collected during November 2005 in the inland sea were larger, wider and with higher volume than eggs collected from northern and central Chile. In the inland sea during November 2005, the anchoveta spawning was located mainly inside deep fjords (Comau and Reloncavi fjords); in such deep fjords abundance of both, eggs and preflexion larvae (i.e., <9 mm) were higher (>5,000 eggs per 10 m²; up to 2,178 larvae per 10 m², respectively) than at shallow waters of Chiloe Island (<100 eggs per 10 m²; up to 65 larvae per 10 m²). Additionally, postflexion larvae (i.e., >9 mm larval length) were collected exclusively in the fjord region (10_505 larvae per 10 m²). The Brunt-Väisälä frequency (N²) showed positively significant correlations with anchoveta eggs and larvae abundance, meaning that higher abundance of both eggs and larvae were collected in areas with more stable water columns. This stability may induce higher survival rates of early life stages of anchoveta and may be related with the recent increasing in the landings of other small pelagic fishes such as the Falkland sprat (Sprattus fuegensis).
author	Bustos,Claudia A Landaeta,Mauricio F Balbontín,Fernando
author_facet	Bustos,Claudia A Landaeta,Mauricio F Balbontín,Fernando
author_sort	Bustos,Claudia A
title	Spawning and early nursery areas of anchoveta Engraulis ringens Jenyns, 1842 in fjords of southern Chile
title_short	Spawning and early nursery areas of anchoveta Engraulis ringens Jenyns, 1842 in fjords of southern Chile
title_full	Spawning and early nursery areas of anchoveta Engraulis ringens Jenyns, 1842 in fjords of southern Chile
title_fullStr	Spawning and early nursery areas of anchoveta Engraulis ringens Jenyns, 1842 in fjords of southern Chile
title_full_unstemmed	Spawning and early nursery areas of anchoveta Engraulis ringens Jenyns, 1842 in fjords of southern Chile
title_sort	spawning and early nursery areas of anchoveta engraulis ringens jenyns, 1842 in fjords of southern chile
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000200014
work_keys_str_mv	AT bustosclaudiaa spawningandearlynurseryareasofanchovetaengraulisringensjenyns1842infjordsofsouthernchile AT landaetamauriciof spawningandearlynurseryareasofanchovetaengraulisringensjenyns1842infjordsofsouthernchile AT balbontinfernando spawningandearlynurseryareasofanchovetaengraulisringensjenyns1842infjordsofsouthernchile
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Spawning and early nursery areas of anchoveta Engraulis ringens Jenyns, 1842 in fjords of southern Chile

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