Application of an electrified benthic frame trawl for sampling fish in a very large European river (the Danube River) - Is offshore monitoring necessary?
Identifieur interne : 000252 ( Main/Merge ); précédent : 000251; suivant : 000253Application of an electrified benthic frame trawl for sampling fish in a very large European river (the Danube River) - Is offshore monitoring necessary?
Auteurs : Z. Szaloky [Hongrie] ; A. I. György [Hongrie] ; B. Toth [Hongrie] ; A. Sevcsik [Hongrie] ; A. Specziar [Hongrie] ; B. Csanyi [Hongrie] ; J. Szekeres [Hongrie] ; T. Eros [Hongrie]Source :
- Fisheries research [ 0165-7836 ] ; 2014.
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- Pascal (Inist)
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Abstract
The organization of fish assemblages in offshore, deep channel habitats is poorly known in very large rivers compared with shoreline, littoral areas. We report on the parameters and testing of an electrified benthic frame trawl (EBFT), developed for monitoring the distribution and abundance of benthic fishes in the Danube River, Hungary. We also compare the results of the benthic main channel survey with a shoreline electrofishing (SE) data set. Altogether 33 species were collected offshore during the 175 trawling paths (500 m long each). Both sample based and individual based rarefaction showed that night time SE detected significantly more species with increasing sampling effort than day time trawling of offshore areas. However, offshore surveys detected sterlet Acipenser ruthenus, which could not be detected by SE, even using extreme high sampling effort. Offshore trawling also proved the common occurrence and high abundance of the strictly protected endemic Danube streber Zingel streber in the river, which proved to be extremely rare in SE catches. The EBFT caught larger/older individuals of many species than SE, and indicated diverse size/age structure for many species offshore. Our survey revealed that offshore areas are intensively used by a variety of species, which occur relatively even, but with variable abundance in the Danube River. We suggest that even a relatively small (i.e. 2 m wide 1 m high) EBFT can be a very useful device for monitoring offshore fish assemblages in very large rivers and provide important data for bioassessment and conservation purposes.
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Eros</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Balaton Limnological Institute, MTA Centre for Ecological Research, Klebelsberg Kuno u. 3</s1><s2>8237 Tihany</s2><s3>HUN</s3><sZ>5 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>Hongrie</country><wicri:noRegion>8237 Tihany</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">14-0109622</idno><date when="2014">2014</date><idno type="stanalyst">PASCAL 14-0109622 INIST</idno><idno type="RBID">Pascal:14-0109622</idno><idno type="wicri:Area/PascalFrancis/Corpus">000020</idno><idno type="wicri:Area/PascalFrancis/Curation">000354</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000025</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000025</idno><idno type="wicri:doubleKey">0165-7836:2014:Szaloky Z:application:of:an</idno><idno type="wicri:Area/Main/Merge">000252</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Application of an electrified benthic frame trawl for sampling fish in a very large European river (the Danube River) - Is offshore monitoring necessary?</title><author><name sortKey="Szaloky, Z" sort="Szaloky, Z" uniqKey="Szaloky Z" first="Z." last="Szaloky">Z. Szaloky</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Danube Research Institute, MTA Centre for Ecological Research, Jávorka Sándor u. 14</s1><s2>2131 Göd</s2><s3>HUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>Hongrie</country><wicri:noRegion>2131 Göd</wicri:noRegion></affiliation></author><author><name sortKey="Gyorgy, A I" sort="Gyorgy, A I" uniqKey="Gyorgy A" first="A. I." last="György">A. I. György</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Danube Research Institute, MTA Centre for Ecological Research, Jávorka Sándor u. 14</s1><s2>2131 Göd</s2><s3>HUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>Hongrie</country><wicri:noRegion>2131 Göd</wicri:noRegion></affiliation></author><author><name sortKey="Toth, B" sort="Toth, B" uniqKey="Toth B" first="B." last="Toth">B. Toth</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Danube-Ipoly National Park Directorate, Költö u. 21</s1><s2>1121 Budapest</s2><s3>HUN</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Hongrie</country><placeName><settlement type="city">Budapest</settlement><region nuts="2">Hongrie centrale</region></placeName></affiliation></author><author><name sortKey="Sevcsik, A" sort="Sevcsik, A" uniqKey="Sevcsik A" first="A." last="Sevcsik">A. Sevcsik</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Danube-Ipoly National Park Directorate, Költö u. 21</s1><s2>1121 Budapest</s2><s3>HUN</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Hongrie</country><placeName><settlement type="city">Budapest</settlement><region nuts="2">Hongrie centrale</region></placeName></affiliation></author><author><name sortKey="Specziar, A" sort="Specziar, A" uniqKey="Specziar A" first="A." last="Specziar">A. Specziar</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Balaton Limnological Institute, MTA Centre for Ecological Research, Klebelsberg Kuno u. 3</s1><s2>8237 Tihany</s2><s3>HUN</s3><sZ>5 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>Hongrie</country><wicri:noRegion>8237 Tihany</wicri:noRegion></affiliation></author><author><name sortKey="Csanyi, B" sort="Csanyi, B" uniqKey="Csanyi B" first="B." last="Csanyi">B. Csanyi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Danube Research Institute, MTA Centre for Ecological Research, Jávorka Sándor u. 14</s1><s2>2131 Göd</s2><s3>HUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>Hongrie</country><wicri:noRegion>2131 Göd</wicri:noRegion></affiliation></author><author><name sortKey="Szekeres, J" sort="Szekeres, J" uniqKey="Szekeres J" first="J." last="Szekeres">J. Szekeres</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Danube Research Institute, MTA Centre for Ecological Research, Jávorka Sándor u. 14</s1><s2>2131 Göd</s2><s3>HUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country>Hongrie</country><wicri:noRegion>2131 Göd</wicri:noRegion></affiliation></author><author><name sortKey="Eros, T" sort="Eros, T" uniqKey="Eros T" first="T." last="Eros">T. Eros</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Balaton Limnological Institute, MTA Centre for Ecological Research, Klebelsberg Kuno u. 3</s1><s2>8237 Tihany</s2><s3>HUN</s3><sZ>5 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country>Hongrie</country><wicri:noRegion>8237 Tihany</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Fisheries research</title><title level="j" type="abbreviated">Fish. res.</title><idno type="ISSN">0165-7836</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Fisheries research</title><title level="j" type="abbreviated">Fish. res.</title><idno type="ISSN">0165-7836</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Animal community</term><term>Benthic zone</term><term>Danube Basin</term><term>Electrofishing</term><term>European rivers</term><term>Fishery</term><term>Offshore</term><term>Pisces</term><term>Sampling</term><term>Stream</term><term>Trawl</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Zone benthique</term><term>Chalut</term><term>Echantillonnage</term><term>Cours eau</term><term>En mer</term><term>Communauté animale</term><term>Pêcherie</term><term>Cours d'Eau d'Europe</term><term>Bassin Danube</term><term>Pisces</term><term>Pêche électrique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The organization of fish assemblages in offshore, deep channel habitats is poorly known in very large rivers compared with shoreline, littoral areas. We report on the parameters and testing of an electrified benthic frame trawl (EBFT), developed for monitoring the distribution and abundance of benthic fishes in the Danube River, Hungary. We also compare the results of the benthic main channel survey with a shoreline electrofishing (SE) data set. Altogether 33 species were collected offshore during the 175 trawling paths (500 m long each). Both sample based and individual based rarefaction showed that night time SE detected significantly more species with increasing sampling effort than day time trawling of offshore areas. However, offshore surveys detected sterlet Acipenser ruthenus, which could not be detected by SE, even using extreme high sampling effort. Offshore trawling also proved the common occurrence and high abundance of the strictly protected endemic Danube streber Zingel streber in the river, which proved to be extremely rare in SE catches. The EBFT caught larger/older individuals of many species than SE, and indicated diverse size/age structure for many species offshore. Our survey revealed that offshore areas are intensively used by a variety of species, which occur relatively even, but with variable abundance in the Danube River. We suggest that even a relatively small (i.e. 2 m wide 1 m high) EBFT can be a very useful device for monitoring offshore fish assemblages in very large rivers and provide important data for bioassessment and conservation purposes.</div></front></TEI><affiliations><list><country><li>Hongrie</li></country><region><li>Hongrie centrale</li></region><settlement><li>Budapest</li></settlement></list><tree><country name="Hongrie"><noRegion><name sortKey="Szaloky, Z" sort="Szaloky, Z" uniqKey="Szaloky Z" first="Z." last="Szaloky">Z. Szaloky</name></noRegion><name sortKey="Csanyi, B" sort="Csanyi, B" uniqKey="Csanyi B" first="B." last="Csanyi">B. Csanyi</name><name sortKey="Eros, T" sort="Eros, T" uniqKey="Eros T" first="T." last="Eros">T. Eros</name><name sortKey="Gyorgy, A I" sort="Gyorgy, A I" uniqKey="Gyorgy A" first="A. I." last="György">A. I. György</name><name sortKey="Sevcsik, A" sort="Sevcsik, A" uniqKey="Sevcsik A" first="A." last="Sevcsik">A. Sevcsik</name><name sortKey="Specziar, A" sort="Specziar, A" uniqKey="Specziar A" first="A." last="Specziar">A. Specziar</name><name sortKey="Szekeres, J" sort="Szekeres, J" uniqKey="Szekeres J" first="J." last="Szekeres">J. Szekeres</name><name sortKey="Toth, B" sort="Toth, B" uniqKey="Toth B" first="B." last="Toth">B. Toth</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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