KHẢ NĂNG SỬ DỤNG RONG MỀN (Cladophoraceae) KHÔ LÀM THỨC ĂN CHO CÁ TRẮM CỎ (Ctenopharyngodon idellus)

Evaluating the potential use of dried blanket weed (Cladophoraceae) to replace the pellet feed for the grass carp (Ctenopharyngodon idellus) was carried out . The experiment composed of four treatments with three replicates. In 2 control treatments (single diets), fish was fed daily either pellet feed or dried blanket weed. In two other treatments, fish was fed two alternative feeding regimes consisting of 1 day dried blanket weed and 1 consecutive day pellet feed or and 2 consecutive days or dried blanket weed and 1 consecutive day pellet feed. After 45 days of culture, the survival of experimental fish was not affected by the feeding treatments and ranging from 93.3 to 99.0%. The growth rates of fish in the alternative feeding treatments were higher than those of the control treatment. Application of the combined feeding regimes, feed conversion ratio and cost of pellet feed could be reduced from 51.74 to 68.26%. These results indicated that dried blanket weed can be used as feed source to partially substitute pellet feed for rearing the grass carp.