CEMALETTİN ŞAHİN, YUSUF CEYLAN, FERHAT KALAYCI

Purse Seine Fishery Discards on the Black Sea Coasts of Turkey

Çalışmanın amacı, Türkiyenin Karadeniz kıyısal sularında gırgır avcılığının bycatch ve ıskarta miktarlarını ve kıyısal ekosisteme olan etkilerini belirlemektir. Çalışma Eylül 2009-Nisan 2010 tarihleri arasında av sezonu boyunca yapılmış ve on altı operasyon örneklenerek av kompozisyonları belirlenmiştir. Örneklemeler esnasında 26 canlı yakalanmış olup bunlar; 24 tür balık, 1 tür gastropod ve 1 tür yengeçtir. Operasyonlarda iki tür hedeflenmiştir, bunlar hamsi (Engraulis encrasicolus) ve istavrittir(Trachurus mediterraneus). Toplam 115.958,34 kg biokütle elde edilmiş olup; bunun %97,83ü hedef av, %2,16sı tesadüfi av ve %1,64si ise ıskarta olarak tespit edilmiştir. Hamsi ve istavrit operasyonlarında ıskarta oranı sırasıyla %1,65 ve %1,47dir. Cluster ve MDS analizleri sonucunda derinliğe bağlı olarak ıskarta sayısı ve miktarı açısından üç farklı derinlik grubu (G1, G2, G3) belirlenmiştir. Pazarlanan ve ıskarta edilen grupların ekolojik parametreleri arasında önemli farklılıklar tespit edilmiştir (ANOVA test, P

Türkiye nin Karadeniz Kıyılarındaki Gırgır Balıkçılığının Iskartası

The purpose of this study was to determine the amount of bycatch and discards of the purse seine fishery in the Black Sea coastal waters of Turkey. The study was conducted during the September 2009 April 2010 fishing season, sixteen purse seiner operations were sampled and their catch composition was determined. During the samplings, 26 species consisting of fish (24 species), gastropods (1 species), and crab (1 species) were caught. Two species, Engraulisen crasicolus and Trachurus mediterraneus were targeted in the operations. The total biomass was 115,958.34 kg, of which 97.83% (by weight) were identified as target species, and 2.17% as bycatch. The weighed discard rate was determined as 1.64%. Discard ratios of anchovy and horse mackerel operations were 1.65% and 1.47%, respectively. Based on depth, three depth groups were identified in terms of the amount and number of discards (G1, G2, G3) using cluster and MDS analyses. Ecological parameters of the landed and discarded groups were significantly different (ANOVA test, P<0.05). Discards from the coastal area were completely different from other ones; the result was obtained by a post-hoc multiple comparison test.

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