| 英文摘要 |
This project investigated the application of culturing marine snail Babylonia areolata in ponds previously used for culturing abalone. Marine snail could survive at low DO with optimum growth temperature and salinity at 20-30 ℃ and 20-30 ppt，respectively. This marine snail species exhibited high tolerance against temperature and salinity differences for 5 ℃ and 13 ppt, respectively. In addition, the snail could also survive at high concentration of ammonium and nitrate. Therefore, marine snail is found to be a suitable species for culture in abalone ponds. The survival of snail was poor at body weight below 2 gram raised in pond adding sands which the survival rate was good at body weight above 2 gram without adding sands. However, the addition of sands in the culture pond could increase survival rate of the snail. The growth rate and feed conversion rate(FCR )of the snail cultured at density 100 snail/basket was better than that cultured at density 150 snail/basket. The growth rate, survival rate and FCR of snail cultured in ponds adding sands was better than that cultured in ponds setting with quadrangular bricks. The addition of probiotics in the ponds could reduce concentration of ammonium and nitrate. The major bacterial species isolated from moribund marine snail was Vibrio spp. However, the cause of death for snail was still not clear and a further study was needed. The culture of snail from juvenile in one abalone pond（12 m2）could produce profit of 4,560 NT dollars to market size and 7,700 NT dollars at density 100 snail/basket and 125 snail/basket，respectively. Furthermore, the profit of ponds adding sands to culture the snail at density of 900 snail/m2 and 1,800 snail/m2 was 360 NT dollars and 10,000 NT dollars, respectively. |
