摘要
研究设定40、80、120、160 ind.m-24个密度梯度,观察不同密度下凡纳滨对虾行为与生理变化.结果显示:凡纳滨对虾昼夜活动频率,昼夜游走距离均随着养殖密度的增大而增大(P<0.05);各密度水平的游走距离均在摄食中阶段最高.不同密度下,凡纳滨对虾每天摄入食物能量无显著性差异(P>0.05),但摄食能量分配于生长的比例随着密度的增大而降低(P<0.05),而消耗于排泄和代谢的比例随密度的增大而升高(P<0.05).对虾过氧化物酶(CAT)活力和丙二醛(MDA)含量随密度增大和胁迫时间延长呈现逐步升高的态势(P<0.05),而超氧化物歧化酶(SOD)活力随密度的增大和胁迫时间的延长则呈现逐步下降的趋势(P<0.05).实验表明,密度胁迫下,凡纳滨对虾的活动水平增加,能量消耗增大,而生长速度和免疫水平则相对降低.
Effects of different stocking densities, 40,80,120 and 160 ind·m^（-2） on behaviors and physiological activities in Litopenaeus vannamei were investigated. The results showed that the movement frequencies and diurnal moving distances of the shimps were increased with increasing stocking densities （P 〈 0. 05 ）. There were no significant differences of energy gained among the four treatments （P 〉 0. 05 ）. When the shrimps were in higher stocking densities, energy allocated to the growth decreased （P 〈 0. 05 ）, but energy for metabolism and excretion increased （ P 〈 0. 05 ）. With increasing stocking densities and extension of time, catalase （CAT） activities and malondialdehyde （MDA） levels increased gradually （P 〈 0. 05） but superoxide dismutase （ SOD ） activities decreased （ P 〈 0. 05 ）. It was considered that in Litopenaeus vannamei, density stress promoted movement levels and energy consumption, but lessened the growth rates and immune activities.
出处
《暨南大学学报（自然科学与医学版）》
CAS
CSCD
北大核心
2012年第1期81-86,110,共7页
Journal of Jinan University(Natural Science & Medicine Edition)
基金
广东省自然科学基金项目(07005911)
广东省重大科技专项项目(2007A032600004)
广东省海洋渔业科技推广专项项目(A200899J01)
关键词
密度胁迫
凡纳滨对虾
行为
能量收支
免疫功能
density stress
Litopenaeus vannamei
behaviors
energy budget
immune function
