| 英文摘要 |
Swamp eel larvae are abundant with reasonable price here in Taiwan, hence serve as potential culture species. The optimal level of protein from fish meal in the artificial diet for eel larvae at 51-54% causes the cost increased. In the present study, the eel were fed with the diets containing the substitution of eel fish meal with Lactobacillus fermented soybean meal at 0%、5%、10%、15%and 20% for 8 weeks. The results showed that the weight gain (116.9%) and feed efficiency (0.75) of the eel fed with diet containing 15% substitution treatment were better than other treatments. Therefore, we suggested that the eel fed the diet containing with 15% substitution fermented soybean meal can saving feed cost. During the cultivation, the water qualities such as water temperature, pH, dissolved oxygen, nitrite-N, ammonia-N were lower than the safe levels. To establish the cultivating system for cultivating the larvae stage of eel, the Pump driven by water level difference for breeding in order to save power consumption of the motor drive required were conducted. During the cultivation for four months, the survival rate of eel was 50%, and infections of red spot diseas, red fin disease, Edeardsiellosis, Dactylogyriasis, Trichodinosis resulted from the feeding of wild live worm (Tubifex hattai). In addition, it was observed that some eel revealed emaciation and high mortality by birnavirus infection. In cultivating system of eel, the over producing of mucus easily caused the deterioration of water quality and obstruction in circulation system. Therefore, in the present study, the low water level and water exchanged volume were conducted in the cultivation, which referred to the increase of water exchanging rate in the low water level to keep the clean water and to decrease the disease infection. |
