Effects of dietary Schizochytrium sp. supplementation on morphological characters and growth performance of Nile tilapia (Oreochromis niloticus)

Soudsada Saiyasaeng , Bundit Yuangsoi , Pattama Wiriyapattanasub and Sutee Wongmaneeprateep

ABSTRACT: The effects of dietary Schizochytrium sp. supplementation on morphological characters and growth performance of Nile tilapia (Oreochromis niloticus) were studied. Fish (initial weight 84.08-84.26 g) were fed with pelleted feed (30% crude protein) supplemented with Schizochytrium at 0% (control group), 2.5%, 5.0% and 7.5% and reared for 8 weeks. Results were shown that body depth gain and dorsal width gain of fish fed 7.5% Schizochytriumhad the highest values (2.58±0.19and1.00±0.11 cm), which was significantly higher (P<0.05) than the control group. The average weight gain of fish fed 7.5, 5.0 and 2.5% Schizochytrium were162.75±9.79,132.19±12.66 and 113.87±18.39g, respectively, and were significantly different (P<0.05) from the control group which was 89.15±17.70 g. Average daily growth rate, specific growth rate and feed conversion ratio of the fish fed 2.5, 5.0 and 7.5 % Schizochytrium were significantly higher (P<0.05) than control group, which the fish fed 7.5% Schizochytrium had the highest values (2.91±0.17g/fish/day, 1.92±0.08%/day and 0.84±0.04, respectively). Results from this study indicated supplemented pellet feed with Schizochytrium at 7.5% could increase body depth and dorsal width of the fish. In addition, using Schizochytriumat 2.5 to 7.5% could increase growth performance of the fish.

Keywords: Morphology,Schizochytrium, Dietary supplementation, Nile tilapia, Oreochromis niloticus

Source : https://ag2.kku.ac.th/kaj/PDF.cfm?filename=O08.pdf&id=1178&keeptrack=13