Effect of three feeding regimes on growth, condition factor and food conversion rate of pond cultured Parachanna obscura (Gunther, 1861) (Channidae) in Calabar, Nigeria

Bu çalışmada, Parachanna obscura’nın yapay lentik sistemde yetiştirme olasılığı araştırılması amaçlanmıştır. P. obscura’ya uygulanan üç farklı beslenme rejiminin büyüme ve yaşama oranına etkileri incelenmiştir. Aynı şekilde türün; Nil tilapyasının Oreochromis niloticus aşırı popülasyon artışını kontrol altına alma özelliği de incelenmiştir. Sonuç olarak; P. obscura’nın O. niloticus’ın stoka katılımının kontrolünde oldukça etkili olduğu ve böylece 109,9 g ve 420,0 g’lık ortalama pazarlanabilir boylarla sırasıyla hem P. obscura hem de O. niloticus için bireysel büyüme oranlarını arttırdığı bulunmuştur. Ayrıca O. niloticus yavrularının P. obscura türüne canlı yem olarak verilmesi sonucu ağırlık olarak büyüme, P. obscura’nın hem ıskartayla hem de suni karma yem ile beslendiği deneyden sırasıyla %64,52, %57,75 ve %43,38 oranlarında fazla bulunmuştur. Canlı Tilapia, ıskarta balık ve karma yem için yem dönüşüm oranları sırasıyla 1,3, 2,3 ve 3,1 olarak bulunmuştur. Fakat diğer nemli yemlere göre (canlı Tilapia yem ve balık yemi) karma yem için bu değer çok düşüktür. Böylelikle karma yem için bu değer güvenilir görünmemektedir. Canlı Tilapia ile beslemede, türün kondisyonu en yüksek değerde olmuş ve P. obscura için bunun son derece önemli yem bileşeni olduğu bildirilmiştir.

Anahtar Kelimeler:

besin analizi, yem çevirimi, Oreochromis niloticus, yemleme, büyüme, su kalitesi

Havuzda yetiştirilen Parachanna obscura (Gunther, 1861) (Channidae)’ya uygulanan üç beslenme rejiminin; büyüme, kondisyon faktörü ve yem dönüşüm oranına etkisi

This study was aimed at investigating the possibility of culturing Parachanna obscura in an artificial lentic system. The effects of three different feeding regimes on growth and survival of P. obscura were tested. Likewise, the species ability to act as a controlling agent to the over-population of the Nile Tilapia, Oreochromis niloticus was also investigated. Results indicated that the culture of P. obscura with O. niloticus was quite effective in the recruitment control of tilapia and thus, enhanced individual growth rate of both P. obscura and O. niloticus with average marketable sizes of 109.9 g and 420 g, respectively. Moreover, the growth in weight of the live tilapia experiment wherein the fry of O. niloticus served as food for P. obscura was significantly greater than that where P. obscura fed on both trash fish and artificially compounded feed, producing weight gains of 64.52%, 57.75% and 43.38%, respectively. The feed conversion rates for live tilapia food, trash fish food and compounded feed have been found as 1.3, 2.3 and 3.1 respectively. But, this value for compounded feed is very low according to other moisture foods (live tilapia food and fish food). Therefore, this value for compounded feed does not seem to be reliable. The live tilapia feeding treatment gave the greatest improvement in condition of this species, suggesting this as highly essential feed component for P. obscura.

Keywords:

proximate analysis, feed conversion, Oreochromis niloticus, feeding, growth, water quality,

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