Gonad development and sex ratio of sharptooth catfish (Clarias gariepinus Burchell, 1822) cultured under laboratory conditions
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Tarih
2007
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Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Mevcut çalışmada laboratuvar koşullarında yetiştirilen karabalıkların gonad gelişimleri yumurtadan çıktıktan sonra 365 gün boyunca histolojik ve morfolojik olarak incelenmiştir. Hem erkek hem de dişiler için yumurtadan çıktıktan sonraki 295. günde eşeysel olgunluğa ulaştığı belirlenmiştir. Testislerin oluşumunda 5, ovaryumların oluşumunda ise 6 gelişim aşaması saptanmıştır. Ovaryum gelişim paterni grup senkronize olarak kategorize edilmiştir. Deneme süresince örneklenen 200 balık için cinsiyet oranları 90 erkek ve 110 dişi olarak belirlenmiş olup, bu farklılık önemli bulunmamıştır (P > 0,05). Ayrıca erkeklerin ortalama canlı ağırlıklarının dişilerinkinden daha yüksek olduğu tespit edilmiştir (P < 0,05). Vitellogenezin başlangıcı Nisan ayında kaydedilmiş ve ovaryum gelişimi Temmuzda pik yapmıştır. Bu sonuçlar, bir yaşındaki erkek ve dişi C. gariepinus'un standart laboratuvar koşullarında yavru elde etmek amacıyla kullanılabileceğini önermektedir.
In the present work, gonad development and sex ratio of sharptooth catfish (Clarias gariepinus) cultured under laboratory conditions over 365 days from hatching were investigated histologically and morphologically. The maturation stage for both males and females was detected 295 days after hatching. Five and 6 developmental stages were indicated for testis and ovaries,respectively. The developmental pattern of ovaries was categorised as the group-synchronous type. The sex ratio of the 200 sampled fish was 90:110 (male:female) and this difference was not significant (P > 0.05). Additionally, final live mean weight of the males was higher than that of the females (P < 0.05). The beginning of vitellogenesis was in April and ovarian development peaked in July. These results suggest that 1 -year-old male and female C. gariepinus can be used as brood stock for seed production under standard laboratory conditions.
In the present work, gonad development and sex ratio of sharptooth catfish (Clarias gariepinus) cultured under laboratory conditions over 365 days from hatching were investigated histologically and morphologically. The maturation stage for both males and females was detected 295 days after hatching. Five and 6 developmental stages were indicated for testis and ovaries,respectively. The developmental pattern of ovaries was categorised as the group-synchronous type. The sex ratio of the 200 sampled fish was 90:110 (male:female) and this difference was not significant (P > 0.05). Additionally, final live mean weight of the males was higher than that of the females (P < 0.05). The beginning of vitellogenesis was in April and ovarian development peaked in July. These results suggest that 1 -year-old male and female C. gariepinus can be used as brood stock for seed production under standard laboratory conditions.
Açıklama
Anahtar Kelimeler
Biyoloji
Kaynak
Turkish Journal of Zoology
WoS Q Değeri
Scopus Q Değeri
Q2
Cilt
31
Sayı
1
