Comparison of the selectivities of double and single codends

摘要

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.