TÓM TẮT NỘI DUNG:

Study on the effect of feed reduction in the integrated of white leg shrimp (Litopeneaus vannamei) with gut weed (Enteromorpha sp.) and blanket weed (Cladophoracea) on survival, growth and feed efficiency of shrimp was conducted. Experiment consisted of 7 treatments was randomly set up with three replicates. The control was fed commercial feed at libitum, other 6 treatments, shrimp were stocked with either gut weed or blanket weed and fed at 75%, 50% and 25% compared with the control. Shrimps postlarvae (0.036 g/PL) were placed in the 100-L plastic tanks (20 PL/tank, appoximately 60 PL.m-2) at salinity of 10 ppt. 100g of gut weed or blanket weed was supplemented during culture period. After 72 days of culture, water quality in the terms of NH 3 /NH 4+ and NO 2- in the integrated treatments lower compared to the control. Average survival of shrimp in the control was 88.3% which was not significantly different (P>0.05) from other treatments. Growth of shrimp of daily weight gain in the integrated culture with gut weed or blanket weed fed 75% satiation (0.103 and 0.101 g/day) were significantly higher than the control (0.073 g/day). The highest of feed conversion ratio (FCR) was observed in the control (1.78) and were significantly different (P<0.05) from other treatments. Protein efficiency ratio (PER) in the control was lowest (1.44) and statistically different from other treatments. These results show that Enteromorpha sp. and Cladophoracea had great effect in the growth of the shrimp, reduce feed costs, improve feeding and environment.