Comparison of the selectivities of double and single codends
Küçük Resim Yok
Tarih
2003
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
This study investigates the differences in the selectivities of 40 rum mesh size single and double codends. The comparisons were carried out in the Bay of Izmir in the Eastern Aegean Sea between 4 and 18 April 2002. A conventional, 600 meshes around mouth, commercially used bottom trawl was operated. Selectivity data were collected in nine hauls with single, and nine hauls with double codends for red mullet (Mullus barbatus), annular sea bream (Diplodus annularis), and common pandora (Pagellus erythrinus). The hooped covered codend method was used for data collection. The data were pooled due to insufficient numbers of fish recorded in individuals hauls, and the selectivity parameters were obtained using a logistic equation with the maximum likelihood method. The single codend had higher L-50 values than the double codend, while the SRs are similar for both the codends for all the species. L-50's of double and single codends were 9.0 and 10.1 cm, respectively for red mullet; 7.7 and 8.7 cm for annular sea bream; and 8.1 and 10.5 cm for common pandora. The results confirm that the use of double codend impedes the escapements of significant proportions of immature fish. (C) 2003 Elsevier Science B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
double codend, selectivity, Aegean Sea, red mullet, annular sea bream, common pandora
Kaynak
Fisheries Research
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
63
Sayı
1
