| Summary: | 碩士 === 國立屏東科技大學 === 水產養殖系 === 94 === Blood parrot is one of the most important ornamental fish. The blood parrot farmers are persecuted by the problem of discoloration. Thus, this research examined the effect of different water temperature, different pH and different photoperiods on the growth, survival, total harvest, feed conversion and discoloration rate of blood parrot. The water quality of ammonia, nitrite, dissolved oxygen, pH and water temperature were analyzed as a reference data to evaluate the environmental quality.
The results show that water temperature would affect the growth, discoloration, total harvest and feed conservation of blood parrot. The best growth, discoloration and total harvest, but poorer feed conservation were found in the higher water temperature (32oC) treatment. Whereas, poorer growth was found at lower water temperature (18 oC), and no discoloration of fish was found at the 18 oC treatment.
For pH trials, the best growth, total harvest and survival of blood parrot were reared in water of weak acid (pH 6-7) and neutral (~pH 7) water, but poor discoloration rate was also observed in this treatment. For pH 8-9 treatment, growth, total harvest and survival rate of fish were lower as compared to the treatments of pH 6-7 and without pH treatment, but the higher discoloration rate was found at pH 8-9 treatment.
For photoperiod trials, the best growth, brilliant color, the highest total harvest and the best discoloration were found in the condition of continually light (L24:D0). Whereas, the poor activity, poor growth and the worst total harvest were cultured in the environment of dark (L0:D24), and the poor discoloration in dark treatment was worse than L24:D0 treatment.
To sum up of all results, for better grow out of blood parrot, the higher water temperature (32), weak acid (pH 6-7) and longer photoperiod (L24:D0) were suggested. For better discoloration of fish, the higher water temperature (32), weak basic (pH 8-9) and longer photoperiod (L24:D0) were recommended
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