Effects of stocking density, water exchange rate, photosynthetic bacteria (Rhodobium orientis) and algal addition on growth, survival and water quality of giant freshwater prawn ( Macrobrachium rosenbergii)

• Main Authors: Qiao-Xin Cai, 蔡喬欣
• Other Authors: Pei-Jei Meng
• Format: Others
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/sj29rd

碩士 === 國立東華大學 === 海洋生物多樣性及演化研究所 === 100 === Macrobrachium rosenbergiis the world's breeding the highest amount of one of three prawns, but still need to improve the environment in shrimp nurturing and strengthening the management. To determine the optimal condition for larval culture of this speices, the effects of stocking density, water exchange rate, photosynthetic bacteria and algal addition on growth, survival and water guality of juveniles were assessed. Photosynthetic strains used the 16SrDNA sequence analysis and results confirm for Rhodobium sp. First, the effects of the photosynthetic bacteria (Rhodobium sp.) at concentrations of 0, 103, 104, 105, 106and 107cells mL-1 on the M. rosenbergii juvenile survival rate is recorded using a control tank with unchanged water and lacking photosynthetic bacteria and algae. The effect on the juvenile freshwater prawn is then calculated with variables such as density of prawn present at 7, 10, 13 and 16 juveniles L-1 and variations of photosynthetic bacteria. 0 juveniles L-1 is control. The effect on the juvenile freshwater prawn is calculated with different treatments are zero-exchange ,change water and gain photosynthetic bacteria. The results indicate that Rhodobium sp. had significantly higher survival rates in tanks with concentrations the other groups than those in the 0 and 103 cells mL-1 tanks (p＜0.05); the growth rates in the103 cells mL-1 tanks had significant (p＜0.05). The seven groups in NH3-N, NO2-N, NO3 -N, PO4-P had no significant differences (p＞0.05). The 7 juveniles L-1 also had significantly higher survival rates in the tanks with 13 and 16 juveniles L-1 tanks (p＜0.05); the growth rates had no significant differences (p＞0.05). The water quality present in the 0 tanks had lower levels of NH3-N, NO2-N, NO3 –N and PO4-P (p＜0.05). The survival rates in the zero-exchange and change water were not significant (p＞0.05); the growth rates in the treatments had no significant differences (p＞0.05). The water quality present in the NH3-N had no significant differences (p＞0.05); PO4-P and NO3 －N in the change water had lower significant(p＜0.05)and NO2 －N in the zero-exchange had higher significant(p＜0.05). This report indicates that the tanks prosper best with a concentration of R. orientis at 104 ~ 107 cells mL-1and juvenile prawns densities of 7 juveniles L-1; zero water exchange in the tank with photosynthetic bacteria and algal can maintain a stable.