Murat ARSLAN, Ayhan YILDIRIM, Serdar BEKTAŞ, Ali ATASEVER

Kuzey Doğu Anadolu Yukarı Aksu Çayı Alabalık, Salmo trutta L. Populasyonunda Büyüme ve Ölüm Oranları

Yukar› Aksu Çay›’nda yaflayan alabal›klar›n (Salmo trutta) yafl, boy, cinsiyet, büyüme ve ölüm oranlar› incelenmifltir. Difli ve erkekler populasyonun s›ras›yla % 52,13 ve % 47,87’sini olusturmufltur. Yafl 1-8 aras›nda tespit edilmifltir. Çatal boy (L) ve toplam a¤›rl›k (W) 5,7-22,8 cm ve 2,9-142,6 g aras›nda de¤iflim göstermifltir. Boy-a¤›rl›k iliflkisi difli, erkek ve tüm populasyon için s›ras›yla W = 0,015 × 2,939, W = 0,015 × L 2,928 ve W = 0,015 × L 2,932 olarak hesaplanm›flt›r. Von Bertalanffy büyüme parametreleri difliler için; L∞ = 33,27 cm, K = 0,107 y›l-1, t0 = –1,046 y›l, erkeler için; L∞ = 29,50 cm, K = 0,143 y›l-1, t0 = -0,562 y›l ve tüm populasyon için; L∞ = 32,13 cm, K = 0,124 y›l-1, t0 = –0,724 y›l olarak tespit edilmifltir. Fi Üssü (Φ`) difliler, erkeler ve tüm bireyler için 2,09 olarak hesaplanm›flt›r. Anl›k toplam ölüm oran› 0,58 y›l-1 olarak tespit edilmifltir.

Anahtar Kelimeler:

Salmo trutta, Do¤uanadolu, Çoruh Nehri, yafl, büyüme, ölüm oran›

Growth and Mortality of the Brown Trout (Salmo trutta L.) Population from Upper Aksu Stream, Northeastern Anatolia, Turkey

Age, sex, mortality, and growth characteristics of brown trout (Salmo trutta) from the upper Aksu Stream were investigated. Females and males comprised 52.13% and 47.87% of the population, respectively. Age ranged from 1 to 8. The fork length (L) and total weight (W) were 5.7-22.8 cm and 2.9-142.6 g, respectively. Length-weight relationships were W = 0.015 x L2.939, W = 0.015 x L2.928, and W = 0.015 x L2.932 for females, males, and overall, respectively. The estimated von Bertalanffy growth parameters were Linfinity = 33.27 cm, K = 0.107 y-1, and t0 = -1.046 y for females; Linfinity = 29.50 cm, K = 0.143 y-1, and t0 = -0.562 y for males; and Linfinity = 32.13 cm, K = 0.124 y-1, and t0 = -0.724 y for overall. Phi prime (F`) was 2.09 for females, males, and overall. Instantaneous total mortality rate (Z) was 0.58 y-1.

Keywords:

Salmo trutta, northeastern Anatolia, Çoruh River, age, growth, mortality,

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