Different growth performance - tilapia (Oreochromis niloticus) in using two different types of feed at Hoa My reservoir, Thua Thien Hue province, Vietnam (Sự tăng trưởng khác nhau của cá rô phi (Oreochromis niloticus) do sử dụng hai loại thức ăn khác nhau

Abstract

    Aquaculture is a kind of method for utilizing the potential of available water areas such as at Hoa My reservoir. The Tilapia (Oreochromis niloticus) with average weight of 20.3 g is a candidate for developing aquacultural activities. Objective find the effect of different protein level: industrial feed (35% protein) and blended feed (21% protein) on growth performance, survival rate parameters of fish. The fingerlings were stocked in four cages (3.5x 2.5x 1.5 meter each), surrounded by fishing net. The temperature, pH and DO parameters were recorded 2 times per day at 7am and 2pm, being calculated as an average value at 7 days interval. Growth measurements of Tilapia relating to the weight and length of fish were recorded at 15 days intervals. The findings show that Hoa My reservoir seems a potential with stability of pH (6.8-7) and DO (4.5-5.4 mg/). The survival rate (SR) in the blended feed is 89,7% and the industrial feed is 94,7%. The feed conversion ratio (FCR) of fish fed by blended feed and industrial feed is 1.6 and 1.42, respectively. It means that the industrial feed had higher economic efficiency 175.000VND, compared with the blended feed in same environmental conditions.