Effect of salinity change and exposure time on the egg stages of two abalone species Haliotis discus discus and H. gigantea
Effect of salinity change and exposure time on the egg stages of two abalone species Haliotis discus discus and H. gigantea
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DOI：
10.1007/s12562-019-01366-4
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发表时间：
2019-10
影响因子：
1.9
通讯作者：
Albert. V. Manuel;P. Tu;N. Tsutsui;T. Yoshimatsu
中科院分区：
文献类型：
--
作者：
Albert. V. Manuel;P. Tu;N. Tsutsui;T. Yoshimatsu
为了更好地了解自然种群数量减少的原因，研究了两种鲍鱼（盘鲍Haliotis Discus Discus、巨型鲍鱼Haliotis gigantea）对不同暴露时间盐度下降的胚胎发育反应。两种实验设计——首先是两种盐度（34 和 17 psu）和四种暴露时间（0、1、2 和 4 小时）的组合，其次是三种盐度（34、24 和 14 psu）和四种暴露时间（0、1、3 和 6 小时）的组合——在圆盘和巨型鲍鱼卵上进行了测试，以确定对孵化起始时间、孵化成功率、异常百分比和存活率的影响率。随着盐度下降和暴露时间增加，这两个物种的孵化开始时间显着增加。随着低盐度水平下暴露时间的增加，这两个物种的孵化成功率均呈下降趋势。至于异常现象，两个物种都表现出低盐度和长时间暴露时间的显着负面影响。与圆盘鲍相比，巨型鲍鱼对低盐度下长时间暴露的适应性更好，因此成活率更高。
The embryonic developmental response of two abalone species (disk abaloneHaliotis discus discus, giant abaloneHaliotis gigantea) to a drop in salinity with different exposure times was investigated to gain a better understanding of the reasons for the decrease in natural stock populations. Two experimental designs—first, combinations of two salinities (34 and 17 psu) and four exposure times (0, 1, 2 and 4 h), and second, combinations of three salinities (34, 24 and 14 psu) and four exposure times (0, 1, 3 and 6 h)—were tested on disk and giant abalone eggs to determine the effects on hatching onset time, hatching success, percentage of abnormality and survival rate. Hatching onset time increased significantly for both species as salinity dropped and exposure time increased. Both species followed a decreasing trend in terms of hatching success as exposure time increased at low salinity levels. As for abnormality, both species showed a significant negative effect of low salinity and long exposure times. Giant abalone showed better adaptability to long exposure time at low salinity levels, and hence a higher survival rate, than disk abalone.