Growth estimates from tagged white sturgeon suggest that ages from fin rays underestimate true age in the Kootenai river, USA and Canada
Identifieur interne : 001276 ( Main/Exploration ); précédent : 001275; suivant : 001277Growth estimates from tagged white sturgeon suggest that ages from fin rays underestimate true age in the Kootenai river, USA and Canada
Auteurs : Vaughn L. Paragamian [États-Unis] ; Raymond C. P. Beamesderfer [États-Unis]Source :
- Transactions of the American Fisheries Society : (1900) [ 0002-8487 ] ; 2003.
Descripteurs français
- Pascal (Inist)
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English descriptors
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Abstract
We used tagging data for 760 recaptured Kootenai River white sturgeon Acipenser transmontanus that had been at large for as long as 23 years to examine the validity of ages assigned from pectoral fin rays. Growth estimates from tagged white sturgeon in the Kootenai River indicated that age estimates from fin rays were underestimates of the true ages. Bias was estimated from growth differences between length-at-age relationships derived from fin ray ages and recaptures of tagged fish. Growth of tagged fish was substantially less than predicted from fin ray length-at-age curves. Age-specific lengths estimated from fin rays cannot be achieved at the growth increments observed for tagged fish. Ages estimated from fin rays were 30-60% less than the apparent ages from tagging data. Thus, actual ages may be 1.5-2.0 times the ages estimated from fin rays. Apparent aging bias will result in substantial changes in population parameters estimated from age, including growth, mortality, longevity, and year-class strength, which will have significant implications for efforts to preserve this endangered species and enable it to recover.
Affiliations:
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Paragamian</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Idaho Department of Fish and Game, 2750 Kathleen Avenue</s1><s2>Coeur d'Alene Idaho 83815</s2><s3>USA</s3><sZ>1 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Coeur d'Alene Idaho 83815</wicri:noRegion></affiliation></author><author><name sortKey="Beamesderfer, Raymond C P" sort="Beamesderfer, Raymond C P" uniqKey="Beamesderfer R" first="Raymond C. P." last="Beamesderfer">Raymond C. P. Beamesderfer</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>S. P. Cramer and Associates, Inc., 39330 Proctor Boulevard</s1><s2>Sandy, Oregon 97055</s2><s3>USA</s3><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Sandy, Oregon 97055</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Transactions of the American Fisheries Society : (1900)</title><title level="j" type="abbreviated">Trans. Am. Fish. Soc. : (1900)</title><idno type="ISSN">0002-8487</idno><imprint><date when="2003">2003</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Transactions of the American Fisheries Society : (1900)</title><title level="j" type="abbreviated">Trans. Am. Fish. Soc. : (1900)</title><idno type="ISSN">0002-8487</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acipenser transmontanus</term><term>Age</term><term>Anatomy</term><term>Bias</term><term>Biological monitoring</term><term>Canada</term><term>Endangered species</term><term>Estimation</term><term>Growth</term><term>Kootenay River</term><term>Longevity</term><term>Meristic character</term><term>Mortality</term><term>Pectoral fin</term><term>Rivers</term><term>United States</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Espèce menacée</term><term>Croissance</term><term>Caractère méristique</term><term>Rivière</term><term>Anatomie</term><term>Nageoire pectorale</term><term>Estimation</term><term>Age</term><term>Longévité</term><term>Mortalité</term><term>Surveillance biologique</term><term>Erreur systématique</term><term>Etats Unis</term><term>Canada</term><term>Acipenser transmontanus</term><term>Rivière Kootenay</term></keywords><keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Canada</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Anatomie</term><term>Mortalité</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We used tagging data for 760 recaptured Kootenai River white sturgeon Acipenser transmontanus that had been at large for as long as 23 years to examine the validity of ages assigned from pectoral fin rays. Growth estimates from tagged white sturgeon in the Kootenai River indicated that age estimates from fin rays were underestimates of the true ages. Bias was estimated from growth differences between length-at-age relationships derived from fin ray ages and recaptures of tagged fish. Growth of tagged fish was substantially less than predicted from fin ray length-at-age curves. Age-specific lengths estimated from fin rays cannot be achieved at the growth increments observed for tagged fish. Ages estimated from fin rays were 30-60% less than the apparent ages from tagging data. Thus, actual ages may be 1.5-2.0 times the ages estimated from fin rays. Apparent aging bias will result in substantial changes in population parameters estimated from age, including growth, mortality, longevity, and year-class strength, which will have significant implications for efforts to preserve this endangered species and enable it to recover.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country></list><tree><country name="États-Unis"><noRegion><name sortKey="Paragamian, Vaughn L" sort="Paragamian, Vaughn L" uniqKey="Paragamian V" first="Vaughn L." last="Paragamian">Vaughn L. Paragamian</name></noRegion><name sortKey="Beamesderfer, Raymond C P" sort="Beamesderfer, Raymond C P" uniqKey="Beamesderfer R" first="Raymond C. P." last="Beamesderfer">Raymond C. P. Beamesderfer</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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