Journals / Turkish Journal of Zoology / 2007 / Cilt: 31 - Sayı: 4
Growth and Mortality of the Brown Trout (Salmo trutta L.) Population from Upper Aksu Stream, Northeastern Anatolia, Turkey
- Journal
- Turkish Journal of Zoology
- Pages
- 337–346
- DOI
- —
Abstract
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.
Özet
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.