Gill net and trammel net selectivity in the northern Aegean Sea, Turkey
Fishing trials were carried out with gill nets and trammel nets in the northern Aegean Sea from March 2004 to February 2005. Four different mesh sizes for the gill nets and the inner panel of trammel nets (16, 18, 20 and 22 mm bar length) were used. Selectivity parameters for the five most economica...
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Consejo Superior de Investigaciones Científicas
2008-09-01
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doaj-19e6f05e5b0048c29ecc3e32094714902021-05-05T13:49:41ZengConsejo Superior de Investigaciones CientíficasScientia Marina0214-83581886-81342008-09-0172352754010.3989/scimar.2008.72n35271000Gill net and trammel net selectivity in the northern Aegean Sea, TurkeyF. Saadet Karakulak0Hakan Erk1Faculty of Fisheries, Istanbul UniversityFaculty of Fisheries, Istanbul UniversityFishing trials were carried out with gill nets and trammel nets in the northern Aegean Sea from March 2004 to February 2005. Four different mesh sizes for the gill nets and the inner panel of trammel nets (16, 18, 20 and 22 mm bar length) were used. Selectivity parameters for the five most economically important species, bogue (Boops boops), annular sea bream (Diplodus annularis), striped red mullet (Mullus surmuletus), axillary sea bream (Pagellus acarne) and blotched picarel (Spicara maena), caught by the two gears were estimated. The SELECT method was used to estimate the selectivity parameters of a variety of models. Catch composition and catch proportion of several species were different in gill and trammel nets. The length frequency distributions of the species caught by the two gears were significantly different. The bi-modal model selectivity curve gave the best fit for gill net and trammel net data, and there was little difference between the modal lengths of these nets. However, a clear difference was found in catching efficiency. The highest catch rates were obtained with the trammel net. Given that many discard species and small fish are caught by gill nets and trammel nets with a mesh size of 16 mm, it is clear that these nets are not appropriate for fisheries. Consequently, the best mesh size for multispecies fisheries is 18 mm. This mesh size will considerably reduce the numbers of small sized individuals and discard species in the catch.http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1010gill nettrammel netselectivityselect methodaegean seaturkey |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
F. Saadet Karakulak Hakan Erk |
spellingShingle |
F. Saadet Karakulak Hakan Erk Gill net and trammel net selectivity in the northern Aegean Sea, Turkey Scientia Marina gill net trammel net selectivity select method aegean sea turkey |
author_facet |
F. Saadet Karakulak Hakan Erk |
author_sort |
F. Saadet Karakulak |
title |
Gill net and trammel net selectivity in the northern Aegean Sea, Turkey |
title_short |
Gill net and trammel net selectivity in the northern Aegean Sea, Turkey |
title_full |
Gill net and trammel net selectivity in the northern Aegean Sea, Turkey |
title_fullStr |
Gill net and trammel net selectivity in the northern Aegean Sea, Turkey |
title_full_unstemmed |
Gill net and trammel net selectivity in the northern Aegean Sea, Turkey |
title_sort |
gill net and trammel net selectivity in the northern aegean sea, turkey |
publisher |
Consejo Superior de Investigaciones Científicas |
series |
Scientia Marina |
issn |
0214-8358 1886-8134 |
publishDate |
2008-09-01 |
description |
Fishing trials were carried out with gill nets and trammel nets in the northern Aegean Sea from March 2004 to February 2005. Four different mesh sizes for the gill nets and the inner panel of trammel nets (16, 18, 20 and 22 mm bar length) were used. Selectivity parameters for the five most economically important species, bogue (Boops boops), annular sea bream (Diplodus annularis), striped red mullet (Mullus surmuletus), axillary sea bream (Pagellus acarne) and blotched picarel (Spicara maena), caught by the two gears were estimated. The SELECT method was used to estimate the selectivity parameters of a variety of models. Catch composition and catch proportion of several species were different in gill and trammel nets. The length frequency distributions of the species caught by the two gears were significantly different. The bi-modal model selectivity curve gave the best fit for gill net and trammel net data, and there was little difference between the modal lengths of these nets. However, a clear difference was found in catching efficiency. The highest catch rates were obtained with the trammel net. Given that many discard species and small fish are caught by gill nets and trammel nets with a mesh size of 16 mm, it is clear that these nets are not appropriate for fisheries. Consequently, the best mesh size for multispecies fisheries is 18 mm. This mesh size will considerably reduce the numbers of small sized individuals and discard species in the catch. |
topic |
gill net trammel net selectivity select method aegean sea turkey |
url |
http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1010 |
work_keys_str_mv |
AT fsaadetkarakulak gillnetandtrammelnetselectivityinthenorthernaegeanseaturkey AT hakanerk gillnetandtrammelnetselectivityinthenorthernaegeanseaturkey |
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