Investigation of Optimal Temperature and Salinity for Long Distance Transport of the pacific abalone (Haliotis discus hannai)

참전복(Haliotis discus hannai)의 장거리 수송을 위한 적정 수온 및 염분 조건 탐색

This study was carried out to investigate the stress response of pacific abalone exposed to various water temperatures (4, 6, 8, and 10℃) and salinities (26, 30, and 34 psu) for 7 days, with the aim of finding optimum conditions for long-distance ocean transport of pacific abalone. At the end of the experiments, the survival rate was ranged from 98.7~100% at 8 and 10℃ but dropped to 25~55% at 4℃ in all salinity levels. The levels of SOD and glutathione in hemolymph were significantly higher at 4 and 6℃ than the control in all salinity groups, indicating that these temperatures induce severe stress in pacific abalone. It was found that THC was lowest at 6℃ in the 26 psu groups. The study showed that the hemocyte of pacific abalone populations mostly consisted of blast-like cells and hyalinocytes with the ratio of hyalinocytes being significantly lower at 4 and 6℃ than the other temperatures in the 26 psu groups. Percentages of apoptotic cells and necrotic cells were higher in the 26 psu group and 4 and 6℃ temperature groups. These results explicit that pacific abalone was exposed to greater stress at 26 psu and at 4 and 6℃ but experienced no significant higher stress at 30 and 34 psu and 8 and 10℃. It was therefore concluded that the optimum temperature and salinity for the long distance transport of pacific abalone range from 8~10℃ and 30~34 psu, respectively.

생존율은 염분과 관계없이 8℃, 10℃일 때는 98.7~100%였으나, 4℃일 때는 생존율이 25~55%로 나타났다. 혈림프액 내 SOD와 glutathione 농도와 같은 스트레스 지표는 모든 염분구에서 4℃, 6℃일 때 높게 나타났다. THC, hemocyte population, apoptotic cell및 necrotic cell의 비율은 염분 별로는 26 psu구에서 가장 높게 나타났고, 4~6℃일 때 다른 실험구에 비해 유의하게 높았다. 이러한 결과들은 26 psu의 염분과 6℃ 이하의 수온에서는 참전복의 스트레스 반응이 증가하였으나, 30, 34 psu의 염분과 8, 10℃의 수온에서는 대조구와 차이가 없어, 참전복의 수송을 위한 적정 수온 및 염분 조건은 8~10℃, 30~34 psu인 것으로 나타난다.