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天津厚蟹对盐度和温度的耐受性

, PP. 93-98

Keywords: 天津厚蟹,盐度,温度,耐受性

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Abstract:

研究了天津厚蟹Helicetientsinensis对盐度和温度的耐受性。天津厚蟹对盐度的耐受能力极强,在温度9~34℃盐度为0的淡水介质中均能存活96h以上;在10℃、20℃及30℃的高渗介质中暴露96h后,天津厚蟹全部存活的盐度分别是65、56和50,全部死亡的盐度分别为83、74和68。天津厚蟹对低温的耐受力较强,在0、30和50盐度水平下,耐受低温的能力差别较大,能耐受96h的最低温度分别是9℃、2℃和6℃。天津厚蟹对高温也有较强的耐受能力,在0、30和50盐度水平下,分别在34℃、36℃和35℃下能耐受96h;盐度50温度38℃时,在开始的24h内无死亡,但48h后死亡率急剧上升,同样规律也出现在30和0溶液中,前者温度是39℃,后者为35℃。研究结果还表明盐度和温度的交互效应显著,二者的交互作用对天津厚蟹的存活亦有显著性影响(P<0.05),温度升高(从10℃到20℃再到30℃)致使其耐盐能力显著下降,而盐度的剧烈变化(从30到50或从30到0)也致使其耐温能力显著下降。

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