M. Fatih CAN, MEVLÜT AKTAŞ, AYDIN DEMİRCİ

Kuzey-Doğu Akdeniz' in derin sularında bulunan Plesionika martia (A. Milne-Edwards, 1883) (Decepoda: Pandalidae)' nın populasyon yapısı ve verimliliği üzerine bir ön çalışma

Bu çalışma 12-13 Haziran 2004 tarihinde Kuzey-Doğu Akdeniz'in derin sularında yürütülmüştür. Ticari bir trol teknesiyle yürütülen araştırmada, 400-600 m derinlikte 6 adet dip trolü çekimi yapılarak kırmızı karides (Plesionika martia, A. Milne-Edwards, 1883)'in populasyon yapısı ile verimliliği üzerine bir ön çalışma yapılmıştır. Toplam 50 adet bireyin örneklendiği araştırmada, cinsiyet oranları (1 S'- 6,14 Ş) arasında dişiler lehine önemli bir fark bulunmuştur (p< 0,05). Ortalama karapaks uzunluğu (CL ± Sd) ve ortalama ağırlık (W ± Sd) erkek ve dişiler için sırasıyla 59,28 ± 14,49 mm (43-77 mm) ve 7,58 ± 3,16 g (4,16-11,73 g), 73,62 ± 9,24 mm (44-87 mm) ve 12,13 ± 3,88 g (4,5-19,7 g) olarak bulunmuştur. Erkek ve dişilerin karapaks boyları ile erkek ve dişilerin toplam ağırlıkları arasındaki farkın önemli olduğu görülmüştür (P

Anahtar Kelimeler:

populasyon yapısı, Decapoda, populasyon dinamiği, karides, Akdeniz, mevsimsel bolluk

A preliminary study on papulation structure and abundance of Plesionika martia (A. Milnen-Edwards, 1883) (Decapoda: Pandalidae) in the depwater of the Northeastern Mediterranean

A preliminary study on population structure and abundance of Plesionika martia (A. Milne-Edwards, 1883) (Decapoda: Pandalidae) in the deepwater of the northeastern Mediterranean. This study was conducted between 12 and 13 June 2004 in the deep waters of the northeastern Mediterranean Sea. A commercial trawl vessel was used and total 6 hauls were done to get some preliminary information on the population structure and abundance of red shrimp, Plesionika martia (A. Milne-Edwards, 1883). A total of 50 specimens were sampled. The overall sex ratio, 1 <$: 6.14 Ş, was significantly biased towards females (p<0.05). The mean carapace length (CL± SD) and mean weight (W± SD) of males and females were calculated as 59.28 +14.49 mm (43-77 mm), 7.58 + 3.16 g (4.16-11.73 g), 73.62 ± 9.24 mm (44-87 mm) and 12.13 ± 3.88 g (4.5-19,7 g), respectively. Significant differences were detected between mean carapace length and weight of males and females (p<0.05j. The ratios of red shrimp in the total catch and in the total shrimp catch were calculated as 5.53 % and 6.84 %, respectively. P. martia specimen were observed in the three out of six hauls. The catch per unit effort in the third haul was 4.5 kg/h, in the forth hauls was 2 specimen/h, and in the fifth haul was 2 specimen/h.

Keywords:

population structure, Decapoda, population dynamics, shrimps, Mediterranean Sea, seasonal abundance,

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