Brood Stock, Treatment and Feed Preparation Experiment 1. A total of 60 P. bocourti (2 & 3 years old of the northeast population from Nakornpanum Fishery Center and the north population from Chiang-Rai Fishery Center; Fig. 1) with an average weight of 1.2 kg were randomly treated by one of four treatments for 11 months (September 2006-July 2007). Three and two replicates of the North and Northeast population with three fish per replicate were performed.