盐度对近江牡蛎幼虫生长及存活的影响

采用室内培育手段,研究了盐度对近江牡蛎(Crassostrea rivularis)幼虫生长及存活的影响。将人工授精孵育的面盘幼虫分别置于盐度依次为16,25,30的砂滤海水中培育至眼点幼虫。每隔一天检测各盐度组幼虫的壳长、壳高和存活数量。结果表明,16盐度组的幼虫生长最快,25盐度组次之,30盐度组最慢。从受精后第14天开始,16盐度组幼虫的生长显著快于30盐度组(P<0.05)。在整个浮游幼虫阶段,高盐度组幼虫的存活率低于低盐度组,其中30盐度组的存活率最低。16和25盐度组在幼虫出现眼点之前均出现大量死亡现象,而30盐度组并没有出现大量死亡现象。上述结果说明,近江牡蛎幼虫经过高盐驯化,对高盐环境的抗性具有一定的提高。

The effect of salinity on growth and survival of Crassostrea rivularis larvae

The effect of salinity on growth and survival of the Jinjiang oyster (Crassostrea rivularis) was revealed using indoor culture method. Artificial insemination was made to produce D larvae of Jinjiang oyster,which was divided into 3 aliquots. Filtered seawater with salinities of 16,25 and 30 was prepared to test the performance of oyster larvae till the eyed larvae stage. Shell length and height,as well as amount of survivors were recorded every other day. The fastest larval growth was found in 16 group,followed by 25 and 30 groups. Larvae in 16 group grew significantly faster than that of 30 group (P<0.05) since 14 days post-fertilization. Larval survival of high salinity was generally lower compared to lower salinity groups. Mass mortality occurred in 16 and 25 groups prior to the eyed larvae stage while larvae in 30 group maintained stable survival. These results suggested that larval resistance to high salinity was somewhat enhanced in Jinjiang oyster following the domestication procedure.