低盐度突变对中国对虾仔虾存活率的影响

１９９６年３－４月在山东日照市代家村对虾育苗场采集中国对虾仔虾，采用实验室培养的方法，研究中国对虾仔虾对不同低盐度突变的幅度及速率的适应能力，并对在不同盐度突变后仍能存活的仔虾体内的１８种氨基酸、１４种脂肪酸及５种维生素的含量作了分析比较。结果表明，当降盐的工范围为３／ｄ－５／ｄ时，部分仔虾可在盐度为零的淡水中存活数天。盐度的变化对仔虾体内氨基酸，脂肪酸和维生素的含量均有一定影响。

THE INFLUENCE OF SALINITY CHANGE ON THE PENAEUS CHINENSIS LARVA

In this paper, the influence of salinity change on the growth survival and nutrient contents of Penaeus chinensis larva was studied. Post-larvae of Penaeus chinensis were collected from Daijiacun Prawn Breeding Factory, Rizhao City, Shandong Province, in April 1996. They were cultured in filtered seawater in room, with salinity being 30 and pH being 7.8-8.2. The water was changed twice a day, and was aerated for whole day. The salinity of the water was adjusted by chlorine free type water. The food for the prawn larvas was artemia, rotifer, and calm meat. The experiment was divided intO two parts. For the first part, there were divided into 5 groups. In 4 groups, 100 poshareae were cultured in seawater with salihity decreasing by 3, 5, 10 and 20 each day, separately; the remainder was control, in which 100 posharvae were cultured in normal seawater. For the second pare in the group with salinity decreasing 3% eash day, post larvae were collected and their contents of different types of drino acid and lipid as well as several vitamins were analyzed when the salinity decreased to 9, 6 and 0, respectively. The results show that if the salinity decreased by 3% every day, then the posharva can live in fresh water for several days, but eventually all the postlarvae died in fresh water. The salinity changes also have some effects on the contents of amino acids, fatty acids and some vitamins.