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<DIV><A href="http://www3.interscience.wiley.com/journal/118483233/home"><FONT
color=#000000>Journal of Fish Biology</FONT></A></DIV>
<DIV class=volIss><A
href="http://www3.interscience.wiley.com/journal/123423180/issue"><FONT
color=#000000>Volume 76 Issue
7</FONT></A>, Pages 1543 - 1564</DIV>
<DIV class=pubOnline>Published Online: 7 May 2010</DIV>
<DIV class=copyrightText><A
href="http://www3.interscience.wiley.com/forwardlinking/?oid=123423184"><FONT
color=#000000></FONT></A> </DIV>
<DIV class=line xmlns:jencode="java.net.URLEncoder"> </DIV>
<DIV class=title-document xmlns="http://www.w3.org/1999/xhtml"><FONT size=4>A
major fish stranding caused by a natural hypoxic event </FONT></DIV>
<DIV class=title-document xmlns="http://www.w3.org/1999/xhtml"><FONT size=4>in a
shallow bay of the eastern South Pacific Ocean</FONT></DIV>
<DIV class=author-info xmlns="http://www.w3.org/1999/xhtml"><SPAN
class=name><SPAN class=forenames>E.</SPAN> <SPAN class=surname>H<SPAN
class=smallcapitals>ernández</SPAN>-M<SPAN
class=smallcapitals>iranda</SPAN></SPAN> <SUP><NOBR>*†</NOBR></SUP> </SPAN>,
<SPAN class=name><SPAN class=forenames>R. A.</SPAN> <SPAN class=surname>Q<SPAN
class=smallcapitals>uiñones</SPAN></SPAN> <SUP><NOBR>*‡§</NOBR></SUP> </SPAN>,
<SPAN class=name><SPAN class=forenames>G.</SPAN> <SPAN class=surname>A<SPAN
class=smallcapitals>edo</SPAN></SPAN> <SUP><NOBR>§</NOBR></SUP> </SPAN>, <SPAN
class=name><SPAN class=forenames>A.</SPAN> <SPAN class=surname>V<SPAN
class=smallcapitals>alenzuela</SPAN></SPAN> <SUP><NOBR>§</NOBR></SUP> </SPAN>,
<SPAN class=name><SPAN class=forenames>N.</SPAN> <SPAN class=surname>M<SPAN
class=smallcapitals>ermoud</SPAN></SPAN> <SUP><NOBR>§</NOBR></SUP> </SPAN>,
<SPAN class=name><SPAN class=forenames>C.</SPAN> <SPAN class=surname>R<SPAN
class=smallcapitals>omán</SPAN></SPAN> <SUP><NOBR>§</NOBR></SUP> </SPAN><SPAN
class=smallcapitals>and</SPAN> <SPAN class=name><SPAN class=forenames>F.</SPAN>
<SPAN class=surname>Y<SPAN class=smallcapitals>añez</SPAN></SPAN>
<SUP><NOBR>§</NOBR></SUP> </SPAN></DIV>
<DIV class=addresses xmlns="http://www.w3.org/1999/xhtml"><SPAN
class=address><SPAN id=a1><SPAN class=number><SUP><NOBR>*</NOBR></SUP>
</SPAN><SPAN class=i><EM>Programa de Investigación Marina de Excelencia (PIMEX),
Facultad de Cs. Naturales y Oceanográficas, Universidad de Concepción, Casilla
160-C, Concepción, Chile</EM></SPAN> </SPAN>, <A class=invisible-anchor
name=a2> </A><SPAN id=a2> <SPAN class=number><SUP><NOBR>‡</NOBR></SUP>
</SPAN><SPAN class=i><EM>Centro de Investigación Oceanográfica en el Pacífico
Sur Oriental (COPAS), Universidad de Concepción, Casilla 160-C, Concepción,
Chile</EM></SPAN> </SPAN><SPAN class=i><EM>and</EM></SPAN> <A
class=invisible-anchor name=a3> </A><SPAN id=a3> <SPAN
class=number><SUP><NOBR>§</NOBR></SUP> </SPAN><SPAN class=i><EM>Departamento de
Oceanografía, Facultad de Cs. Naturales y Oceanográficas, Universidad de
Concepción, Casilla 160-C, Concepción, Chile</EM></SPAN> </SPAN></SPAN></DIV>
<DIV class=correspondence-address xmlns="http://www.w3.org/1999/xhtml"><SPAN
class=correspondence-label>Correspondence to </SPAN><SPAN
class=number><SUP><NOBR>†</NOBR></SUP> </SPAN>Tel.: +56 412207431; fax: +56
412207254; email: <A class=externallink href="mailto:eduhernandez@udec.cl"><FONT
color=#000000>eduhernandez@udec.cl</FONT></A></DIV>
<DIV class=bpg40copyright xmlns:jencode="java.net.URLEncoder"> </DIV>
<DIV class=abstract-title id=Abstract><STRONG>ABSTRACT</STRONG></DIV>
<DIV class=abstract-content xmlns="http://www.w3.org/1999/xhtml"
xmlns:jencode="java.net.URLEncoder" xmlns:md="urn:mdransfi-functions"
xmlns:f="http://wiley.com/wispers/content/function"
xmlns:xs="http://www.w3.org/2001/XMLSchema">
<P class=para>A massive beaching and mortality of fishes occurred in Coliumo
Bay, a shallow bay located along the coast of the eastern South Pacific Ocean on
3 January 2008. This stranding was a consequence of an abrupt decrease in the
dissolved oxygen concentration throughout the whole water column, due to the
effect of intense upwelling along the coast off central-southern Chile. The main
objectives of this study were: (1) to characterize taxonomically and
biologically the fish species assemblage present in this beaching; (2) to
evaluate several physiological indicators for the condition of the beached
species at the time of their death; and (3) to assess the possible cause–effect
mechanisms involved in the fishes death and the changes that took place in the
fish community throughout the time. In this beaching, 26 fish species were
identified: 23 teleosts, one myxiniform and two elasmobranchs. Most beached
specimens were juveniles. Haematological and histological evidence indicate that
severe hypoxia that lasted for at least 48 h was the most plausible cause of
death. The main conclusion of this study is that <U>the presence of oxygen-poor
equatorial sub-surface water in the shallow coastal zone due to intense
regional-scale upwelling</U> caused the fish stranding. Although the effect of
the hypoxic event was severe for the fish assemblage of Coliumo Bay, the rapid
recuperation observed suggests that <U>hypoxic events at the local spatial scale
can be buffered by migration processes from the fish community inhabiting close
by areas non-affected by low oxygen conditions</U>. The effect that severe
hypoxic events may have on larger spatial scales remains
unknown.</P></DIV></FONT><BR>
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