Türkiye’nin Kuzey Ege Kıyılarında Sade Uzatma Ağlarında Farklı Donam Faktörlerinin İzmarit (Spicara maena) Balığı Seçiciliği Üzerine Etkileri

Abstract

The study was conducted at 0-30 meters depth, in the Northern Aegean coast of Turkey, between October 15, 2015 - October 15, 2017. In the study, 9 different gillnets (Mullet nets) having 18-20-22 mm mesh size and 0.35-0.50-0.65 hanging ratio were used. The aim of this study was to determine the selectivity of these nets with different hanging ratios in the fishing of blotched picarel (Spicara maena). In the selectivity calculations made for this species, the SELECT model was used as "bi-modal" for gillnets with E = 0.35 hanging ratio, "log normal " for E = 0.50 hanging ratio and "normal scale" for E = 0.65 hanging ratio, model gave the best results. No selectivity difference depending on different hanging ratio could be determined for the blotched picarel that caught the highest number of fish on the trial nets. However, it has been determined that the optimum length and gillnets selectivity curves calculated for 18 mm mesh sized nets contain the values close to the sexual maturity length calculated for the blotched picarel.

Keywords

• hanging ratio
• blotched picarel
• gillnet
• selectivity
• north eagean