碩士 / 國立臺灣海洋大學 / 水產養殖學系 / 105 / This study was conducted to investigate the effects of supplementing molasses, probiotics and different carbon and nitrogen (C/N) ratio on the water qualities and growth performance of the Pacific white shrimp (Litopenaeus vannamei) in biofloc system with no water exchange.
In the supplementing molasses and probiotics study, the average 0.33 gram white shrimp were cultured in no water exchange tanks with five different treatments including control (without probiotics and molasses), molasses, and molasses with commercial A, commercial B and commercial C, respectively. The results showed that the total ammonia concentration and nitrite concentration of probiotics group were lower than 1 mg / L in the commercial probiotics A, B and C group. The concentration of nitrate in each tested group was accumulated to increase continually through 48 days in this study. The growth result showed that the weight gain ranged from 148% to 179%. The feed conversion ratio and the survival were the best in the molasses group 1.51 and 87%, respectively.
In the different carbon and nitrogen (C/N) ratio study, the average 0.05 gram white shrimp with five treatments including control (without molasses) and supplementing molasses to adjust 4 graded levels of carbon and nitrogen (C/N) ratio as 8.5, 10, 11.5 and 13, respectively. according to Avnimelech (1999). The result showed that the total ammonia concentration in the control group and C/N 8.5 group gradually increased up to 3.92 mg/L and 2.63 mg / L during the study, and that of the other groups were less than 0.5 mg/L. Nitrite concentration in each test group was lower than 0.9 mg/L, nitrate concentration in each group was accumulated to 3ppm and the pH decreased to 7.6 ~ 7.2 during the study. The result of weight gain rate in C/N 13 and C/N 11.5 were the best at 1233.6% and 1205.8%, respectively. The survival of C/N 8.5 and C/N 11.5 were the best at 65.33% and 61.33%, respectively, while the lowest FCR was recorded in the C/N 11.5 group around 1.48. The results suggest that C/N 11.5 was the best for the growth of white shrimp and water quality in this study.
| Identifer | oai:union.ndltd.org:TW/105NTOU5086032 |
| Date | January 2017 |
| Creators | Sun, Yuan-Chao, 孫圓詔 |
| Contributors | Liou, Chyng-Hwa, 劉擎華 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 77 |
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