Studies on the age, growth and reproduction characteristics of the chub, Leuciscus cephalus orientalis, (Nordmann, 1840) in Karasu River, Turkey
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Dosyalar
Tarih
2002
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Tubitak Scientific & Technological Research Council Turkey
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
This study is based on the examination of 759 chubs from Karasu River (40degrees 45' 33 E, 39degrees 56' 16 N) between November 1995 and October 1997. This population comprised seven age groups of males and nine of females. The second age group was dominant in the population. Individuals were composed of 50.46% males and 49.54% females. The male and female ratio was 1:1.019 (M:F). The Von Bertalariffy growth parameters and length-weight relationships were; L-t = 35.8765 (1-e-(0.1241(t+1.16660)), W-t = 583.2981 (1-e(-0,1241(t+1.16660)))(2.952), W = 0.0150 FL2.952 in males and L-t = 41.4154 (1-e(-0.1160(t+1.3207))), W-t = 936.3338 (1-e(-0.1160(t+1.3207))(2.980), W = 0.0142 FL2.980 in females, respectively. The condition coefficients of male, female and all specimens were; 1.32, 1.35 and 1.33, respectively. The relationships between fecundity (F) and fish length (FL), fish weight (W), gonad weight (W-o), and fish age (t) were; F = 1.699 FL2.847 (r = 0.813), F = 969.424 W-o(1.019) (r = 0.953), F = 95.669 W-0.955 (r = 0.843) and F = 862.017 t(0.589) (r = 0.814), respectively. In addition, the relationships. between gonad weight and total weight, fork length of samples were; W-o = 0.394 + 0.723 W (r = 0.763) and W-o = -8.953 + 0.894 FL (r = 0.714) in females (in 119 samples), W-t = 1.598 + 0.037 W (r = 0.660) and W-t = -2.965 + 0.429 FL (r 0.643) in males (in 117 samples), respectively. Fecundity varied from a mean of 5012 eggs per female (III years old) to a mean of 25,000 eggs per female (VIII years old). Egg diameter varied between 100 mum and 137 mum with a mean of 119 mum. The reproduction period of this species inhabiting Karasu River was between May and July, and the first reproduction ages were; age II (for males) and age III (for females).
Açıklama
Anahtar Kelimeler
chub, Leuciscus cephalus orientalis, age, growth, reproduction, Karasu River
Kaynak
Turkish Journal of Veterinary & Animal Sciences
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
26
Sayı
5
