Wutiporn Phromkunthong, Atchariya Musakopat, and Dusit Nakachart

pp. 171 - 185

Abstract

Hynrid eatfish of initial weight 5.57-5.72 g were student in 235-l glass tankks filled with 180 l water and closed-recirculation system with 0.8 l/m flow rate was attached. complete randomized design was employed period was 10 weeks. Formula 1 feed was the control in which fishmeal and soybean meal were used as protein source and was nutritionally suitable for catfish. In formulate 2-6 feeds, only plant materials were used as feed components and sprayed phylase was applied at 0,250,500,750 and 1,000 unit/kg feed. For formular 7-9 feeds, phospkhorus form dicalcium phosphate (DCP) at 0.1,0.2 and 0.3% was supplemented. The results showed that the supplementation of 500 unit/kg feed as well as of 0.2% phosphorus were the most effective in improving the weight gain, specific growth rate and feed efficiency (FCR, PER, and ANPU). The supplementation of phytase as well as of DCP elevated the phosphorus content in the bone as well as in the whole body while the blood parameters were not markedly affected.