盐度对鸭绿沙塘鳢幼鱼存活和生长的影响  

Effects of salinity on survival and growth of sleeper Odontobutis yaluensisJuveniles

作　　者：王吉桥[1] 程骏驰[1] 许重[1] 王声权 巴桂香 史建国[1] 

机构地区：[1]大连水产学院生命科学与技术学院,辽宁大连116023 [2]鞍山市岫岩县水利局,辽宁岫岩114300

出　　处：《水产学杂志》2007年第1期1-8,共8页Chinese Journal of Fisheries

摘　　要：在水温25.0℃～28.0℃下,将平均体重为(0.038±0.005)g的健康鸭绿沙塘鳢(Odontobutis yaluensis)幼鱼直接从淡水放入盐度9.0～14.0(梯度1.0)的水槽(45 cm×31cm×30 cm)中,其12、24、48、72和96h半致死盐度分别为13.56、12.76、10.41、9.92和9.74;放入盐度为28.2的海水中,其50%成活时间为37m in5 sec;经逐渐升盐、驯化后,在盐度0、2.0、4.0、6.0和8.0下饲养60d,结果表明,盐度为0时,鱼生长极显著地慢于其他盐度(p<0.01),盐度为2.0时生长最快,肠蛋白酶和淀粉酶活性高,鳃小片上细胞略膨大,球形,界线清晰,鳃充分张开,其它盐度间鱼的生长速度差异不显著(p>0.05),盐度8.0时鳃细胞萎缩变形,呼吸表面积减少。刚进入盐度2.0的头15 d里,鱼生长显著快于其他组鱼,之后差异不显著,即低盐水刺激鱼生长。Sleeper Odontobutis yaluensis jveniles with body weight of 0. 038 - 0. 005g were directly transferred into a tank （45 cm × 31 cm × 30 cm） from fresh water into salinity of 9.0 - 14.0 （ 1.0 increment） to determine lethal concentrations （ LCS0 ） of salinity and mean survival time（MST） at a water temperature of 25.0℃～ 28.0℃. It was found that 12 - , 24 - , 48 - , 72 - or 96 h- LC50 of salinity was 13.56, 12.76, 10.41,9.92 and 9.74, respectively. MST of 37 min 5 sec was observed in the juveniles that were immediately transferred into a salinity of 28.2. The juveniles with the same size as described above were reared at a salinity of 0, 2.0, 4.0, 6.0 and 8.0 for 60 days after they were gradually acclimated to the expected salinity. The results showed that the fish had very significantly higher specific ＇growth rate at a salinity of 2.0 than at a salinity of 0 （ p 〈 0.01 ）, no significant difference from the fish at a salinity of 4.0, 6.0 and 8.0. The juveniles reared at salinity of 2.0 had high digestive protease and amylase activities, and big cells in gills with high respiratory surface area, indicating that the low salinity stress enhanced fish growth during the first 15 days.

关 键 词：鸭绿沙塘鳢 幼鱼 生长 盐度 成活 

分 类 号：S916.2[农业科学—水产科学]