Figure 11. Size distribution of Trichogaster trichopterus. Mean = 69.7 mm, standard deviation = 9.6, N = 54.
Feeding
Trichogaster Trichopterus are considered carnivorous, the natural diet being different species of invertebrates (Degani 1990). In an intensive culture situation where natural foods are limited a complete diet must be used in order to achieve optimal growth. In addition, formulations capable of enhancing the pigmentation of cultivated tropical fish have considerable application. There are several color enhancing compounds are available. These include beta carotene, canthaxanthin, astaxanthin and xanthophyll. The maximum absorbance was achieved using canthaxanthin as a color enhancer, specimens on a canthaxanthin fortified diet also exhibit a greater iridescence in the chromatophore along the entire integument. These pigment enhancers are usually supplied in the feed at a rate of 0.05 percent active ingredient (Fey and Meyers 1980). Fish are fed in tanks or ponds at least twice daily at a rate of 3-5 percent body weight per day. Experiments carried out by Degani 1990 showed that there was no significant difference in growth of larvae fed commercial diets or a diet consisting of yeast or yeast and egg yolk. Water quality has a more profound effect on growth than the different diets. It has been reported that increased nitrite and nitrate had the most effect on decreasing growth rates (Degani et al. 1990).
Figure 11. Size distribution of Trichogaster trichopterus. Mean = 69.7 mm, standard deviation = 9.6, N = 54.
Feeding
Trichogaster Trichopterus are considered carnivorous, the natural diet being different species of invertebrates (Degani 1990). In an intensive culture situation where natural foods are limited a complete diet must be used in order to achieve optimal growth. In addition, formulations capable of enhancing the pigmentation of cultivated tropical fish have considerable application. There are several color enhancing compounds are available. These include beta carotene, canthaxanthin, astaxanthin and xanthophyll. The maximum absorbance was achieved using canthaxanthin as a color enhancer, specimens on a canthaxanthin fortified diet also exhibit a greater iridescence in the chromatophore along the entire integument. These pigment enhancers are usually supplied in the feed at a rate of 0.05 percent active ingredient (Fey and Meyers 1980). Fish are fed in tanks or ponds at least twice daily at a rate of 3-5 percent body weight per day. Experiments carried out by Degani 1990 showed that there was no significant difference in growth of larvae fed commercial diets or a diet consisting of yeast or yeast and egg yolk. Water quality has a more profound effect on growth than the different diets. It has been reported that increased nitrite and nitrate had the most effect on decreasing growth rates (Degani et al. 1990).
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