The growth and reproduction characteristics of club Leuciscus cephalus orientalis (Nordmann,1840) living in the river aras
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Tarih
1999
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info:eu-repo/semantics/openAccess
Özet
Bu çalışmada. Aralık 1995 ve Kasım 1997 tarihleri arasında Aras Nehri'nden yakalanan 1091 adet tatlısu kefalinin (Leuciscus cephalus orientalis) populasyon yapısı ile büyüme ve üreme özellikleri incelenmiştir. Örneklerin l-VIH yaşlar arasında dağılım gösterdiği belirlenmiştir. İncelenen örneklerin %48.85'ini erkek, %51.15'ini ise dişi bireyler oluşturmuştur. Yakalanan en büyük erkek birey 24.1 cm çatal boy ve Vlll yaş. dişi birey ise 27.5 cm çatal boy ve Vlll yaş olarak saptanmıştır. Boyca ve ağırlıkça Von Bertalanffy büyüme denklemleri erkek ve dişi bireyler için sırasıyla $Lt=32.47(1-e^{0.1217(t+1.63)}), Wt=502.10(1-e^{0.1217(t+1.63)})^{3.113} ve Lt=36.66(1-e^{-0.1114(t+1.39)}), Wt=745.31(1-e^{-0.1114(t+1.39)})^{3.135}$ olarak bulunmuştur. Boy ağırlık ilişkisi ve kondisyon katsayısı erkeklerde $W=0.0099L^{3.113}$ ve 1.326, dişilerde ise $W=0.0093L^{3.135}$ 1.333 olarak hesaplanmıştır. Erkeklerin 2-3, dişilerin ise 3-4 yaşlarında cinsi olgunluğa ulaştıkları, üremenin Mayıs ve Temmuz ayları arasında, ortalama yumurta veriminin ise 3391-17187 adet/dişi olduğu tespit edilmiştir. Bu sonuçlara göre. Aras Nehri'nde yaşayan bu tür için en küçük av büyüklüğünün 20 cm olması ve av yasağının Mayıs-Temmuz aylarını kapsaması önerilmektedir.
In this study, the populations structure, growth and reproduction characteristics of 1091 Leuciscus cephalus orientalis from the Yağan Region of River Aras between December 1995 and November 1997 were investigated monthly. The age composition of this species ranged between I and Vlll. Individuals were composed of 48.85% males and 51.15% females. Female individuals attained greater size and age than males. The largest Female captured was 27.5 cm FL and age VIII, while the largest male was 24.1 cm FL and age Vlll. Von Bertalanffy growth equations (in length and weight) and length-weight relationships were found as $Lt=32.47(1-e^{-0.1217(t+1.63)}), Wt=502.10(1-e^{-0.1217(t+1.63)})^{3.113} W=0.0099L^{3.113in males and Lt=36.66(1-e^{-0.1114(t+1.39)}), Wt=745.31(1-e^{-0.1114(t+1.39)})^{3.135}, W=0.0099L^{3.113}$ in females. Mean condition coefficients of males and females were calculated as 1.326 and 1.333 respectively. Males matured at ages II-III and females at ages lll-lV. Spawning in the both years of study occurred between May and July. Fecundity ranged between 3391-17187 eggs/female and was correlated significantly with fish length, weight, age and gonad weight. The minimum fishing size for this species in the River Aras is suggested to be 20.0 cm in terms of total length and it is recommended that fishing be prohibited between May and July.
In this study, the populations structure, growth and reproduction characteristics of 1091 Leuciscus cephalus orientalis from the Yağan Region of River Aras between December 1995 and November 1997 were investigated monthly. The age composition of this species ranged between I and Vlll. Individuals were composed of 48.85% males and 51.15% females. Female individuals attained greater size and age than males. The largest Female captured was 27.5 cm FL and age VIII, while the largest male was 24.1 cm FL and age Vlll. Von Bertalanffy growth equations (in length and weight) and length-weight relationships were found as $Lt=32.47(1-e^{-0.1217(t+1.63)}), Wt=502.10(1-e^{-0.1217(t+1.63)})^{3.113} W=0.0099L^{3.113in males and Lt=36.66(1-e^{-0.1114(t+1.39)}), Wt=745.31(1-e^{-0.1114(t+1.39)})^{3.135}, W=0.0099L^{3.113}$ in females. Mean condition coefficients of males and females were calculated as 1.326 and 1.333 respectively. Males matured at ages II-III and females at ages lll-lV. Spawning in the both years of study occurred between May and July. Fecundity ranged between 3391-17187 eggs/female and was correlated significantly with fish length, weight, age and gonad weight. The minimum fishing size for this species in the River Aras is suggested to be 20.0 cm in terms of total length and it is recommended that fishing be prohibited between May and July.
Açıklama
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Kaynak
Turkish Journal of Zoology
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Scopus Q Değeri
Cilt
23
Sayı
4
