Ali İŞMEN, Uğur ALTINAĞAÇ, Adnan AYAZ, M. Fatih YAZICI

Marmara Denizi'nde karides algarnasının av kopozisyonu ve hedeflenmeyen av üzerine bir çalışma

Bu çalışmada, Marmara Denizi’nde karides avcılığında kullanılan algarnaların av verimi ve kompozisyonu araştırılarak, avcılık sonucunda tesadüfi avlanan türler ve ıskarta türlerin miktarları belirlenmiştir. Çalışma, Ocak 2003-Mart 2004 dönemleri arasında gerçekleştirilmiştir. Araştırma süresince algarna ile yapılan avcılıkta 37 türün yakalanmıştır. Toplam avın ağırlık olarak % 51,3’nü eklembacaklıların (arthropoda), % 30,9 balıkların (pisces), % 15,5 derisi dikenlilerin (echinodermata), % 1,3 yumuşakçaların (mollusca) oluşturduğu belirlenmiştir. Derinsu pembe karidesi (Parapenaus longirostris), toplam avın % 50,8’ni oluşturmuştur. Hedef türün boy dağılımı 47-154 mm arasında değişmiştir. Algarna ile yapılan avcılıkta av veriminin yaklaşık 10,1 kg/h olduğu hesaplanmıştır. 1 kilogram hedef av için 0,42 kg ıskarta av, 0,62 kg tesadüfi av olmak üzere 1,04 kg hedeflenmeyen av yakalandığı tespit edilmiştir.

A study on the catch composition and bycath of shrimp beam trawı in the sea of Marmara.

A study on the catch composition and bycatch of shrimp beam trawl in the Sea of Marmara. Catch productivity, catch composition, bycatch and discard rates of shrimp beam trawl were investigated between January 2003 and March 2004 in Marmara Sea. A total of 37 species which were captured by beam trawl during survey. The relative abundance in weight, respectively, were 51,3 % arthropoda, 30,9 % fish species, 15,5 % echinodermata, 1,3% mollusc. The deep water pink shrimp (Parapenaus longirostris) formed 50,8 % of the total catch. The length distribution of deep water pink shrimp ranged from 47 mm to 154 mm. Catch productivity in beam trawl fishery was calculated 10,1 kg/h. On average 0,42 kg discard, 0,62 kg incidental catch rate and 1,04 kg by-catch for 1 kg shrimp were estimated from beam trawl fisheries.

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