Ferhat KALAYCI, Osman SAMSUN, Sabri BİLGİN, Necati SAMSUN

Samsun Körfezi' nde avlanan istavrit (Trachurus trachurus L., 1758) balığının bazı biyolojik özelliklerinin belirlenmesi

Karadeniz'in en önemli balıkçılık merkezlerinden biri olan Samsun Körfezi'nde istavrit (Trachunıs trachurus L. 1758) balığının bazı populasyon parametrelerini saptamak amacıyla, Kasım 2004-Mart 2005 tarihleri arasında yürütülen bu araştırmada, toplam 1290 adet balığın (591 adet dişi, 647 adet erkek) yaş, boy, ağırlık ve cinsiyet kompozisyonları ile boy-ağırlık ilişkisi, kondisyon faktörü, Von Bertalanffy büyüme denklemi ve ölüm oranları incelenmiştir. Dişi-erkek oranı 1:1,1 olarak belirlenmiştir. Örneklerin 0-5 yaş grubundan oluştuğu ve 2. yaşın dominant olduğu (%37,60) tespit edilmiştir. Araştırmada boy-ağırlık ilişkisi ve Von Bertalanffy büyüme denklemi genel, dişi ve erkek bireyler için sırasıyla W=0,0063 L30931 (fO,98), W=0,0056T31378 (r=0,96), W=0,0055 L3'1423 (fO,97) ve Lt= 26,74(1 -e^H^mi Lt=26,88(1-e^132(t+w75)), Lt=26,59(1-e-«.131 c^229») şeklinde hesaplanmıştır. İstavrit balıklarında büyüme pozitif allometrik olarak belirlenmiştir. Kondisyon faktörü değeri ortalama 0,6299±0,00151, dişilerde 0,5628±0,002 ve erkeklerde ise 0,5519+0,0018 olarak hesaplanmıştır. Toplam (Z), doğal (M) ve balıkçılık (F) ölümlerinin sırasıyla, Z=1,26 yıM, M=0,27 yıM, ve F=0,99 yıl1 olarak hesaplandığı araştırmada, E=0,79 olarak bulunan sömürülme oranı, populasyonun yoğun bir şekilde avcılık baskısı altında olduğunu göstermektedir.

The determination of some biological characteristics of horse mackarel (Trachurus trachurus L., 1758) caught in Samsun Bay

In the present research, which was carried out during the period of Noverber 2004 to March 2005 in order to determine some population parameters of the Horse mackerel (Trachurus trachurus L, 1758) in the Samsun Bay that one of the most important fisheries area in the Black Sea, a total of 1290 individuals (591 female, 647 male) were investigated according to age, length, weight and sex composition, the relationship of length-weight, condition factor, Von Bertalanffy growth formula and mortality rates. The female-male ratio was 1:1.1. In the specimens consisted of 0-V age groups and the age-group II was dominant (37.60%). In the research, the relationship of length-weight was found for general, male and female determined as W=0.0063 L30931 (r=0.98), W=0.0056 L31378 (r=0.96), W=0.0055 L31423 (r=0.97) and the Von Bertalanffy growth formula was found for general, male and female as Lt=26.74(1-e*138 wm), Lt=26.88(1-e-°-132 (**), Lt= 26.59(1-e-0131 ), respectively. The growth of horse mackerel was determined as positive allometric. It was determined that the average condition value of population was 0.6299±0.00151 0.5628±0.002 for females, 0.5519±0.0018 for males. Total (Z), natural (M) and fishing (F) mortalities were Z=1.26 year1, M=0.27 year1 and F=0.99 year1, respectively. The exploitation ratio E=0.79 indicates that the population is being heavily exploited.

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