| Popis: |
An experiment was conducted for reducing feed cost and to identify the sustainable culture technique for Thai pangas Pangasius hypophthalmus. Fish maintained in four treatments were either: feed to satiation twice a day (Control-A), feed alternative day (1:1- B), starved two days followed by a spell of two days feeding (2:2-C) and starved for 5 days followed by 5 day feeding (5:5-D) at a stocking density of 100 fingerling per decimal at 28±1.54-9- C. Fish in all four treatments were fed to satiation. Thai Pangas responded to a change from a restricted to satiation feeding showing a highecdaily feed demand compared to their counterparts raised on a liberal-feeding regime. The total feed demand of fish in control treatment was, however, much higher than the fish in other three treatments. Nonetheless, fish that were feed to satiation on alternate day (1.:1) had similar body weights to the controls, and were larger than those exposed to 2 or 5 days of feed deprivation (2:2 or 5:5). There was no significant differences in specific growth rate of fish in the treatments A and B over the experimental period. The highest FCR was found in A (Control) where fish were fed to satiation twice a day. There were also no significant differences in tissue protein level in fish from different treatments. The study provided evidence that Thai Pangas could be cultured in feeding regime with feeding in alternate days Without any significant difference in fish size and final production. In this way, Thai pangas culturists can save feed cost up to 30% and make the culture sustainable following alternate days feeding. As the farmers are giving less feed in the system they can control the water quality in a better way. In addition, this type of feeding regime also helps fish farmers to improve their personal time management since they may not need to attend the fish everyday. |
