盐度胁迫对泥蚶能量代谢的影响

在水温(26.4±0.79)℃、盐度11、14.5、18、21.5、25和28.5下,将壳长27~28mm泥蚶饲养在流水系统中24h,每一盐度梯度设置3个平行和3个空白对照,以研究盐度对泥蚶摄食、代谢、碳收支及能量代谢的影响。试验结果显示,随着盐度的升高,泥蚶的滤水率、摄食率、吸收率和O∶N均先升后降,而耗氧率与排氨率先降后升,在盐度18~21.5时显著达到极值(P0.05),但盐度对泥蚶的耗氧率、排氨率和O∶N影响不显著(P0.05)。泥蚶代谢所需要的能量主要由脂肪和碳水化合物提供,盐度18~21.5为泥蚶的适宜盐度范围,此时的能量代谢方程分别为:100C=26.12F+30.75R+5.78U+37.35P;100C=25.06F+32.03R+5.15U+37.76P。

Influences of Salinity Stress on Energy Metabolism in Blood Clam Tegillarca granosa

Influences of salinity on feeding ,metabolic physiology ,carbon budget and energy metabolism were studied in blood clam Tegillarca granosa with shell length of 27—28 mm exposed to a salinity of 11 , 14 .5 ,18 ,21 .5 ,25 and 28 .5 in a recirculating system for 24 hours at water temperature of (26 .4 ± 0 .79)℃ .The results showed that the filtration rate ,ingestion rate ,absorption rate and O∶N were increased at first and then decreased ,and the oxygen consumption rate and ammonia excretion rate decreased at first and then increased with the increasing salinity ,with the extreme value at the salinity from 18 to 21 .5(P<0 .05) ,and without significant differences in oxygen consumption rate ,ammonia excretion rate and O ∶N within the experimental salinity (P>0 .05) .The findings indicated that metabolic energy of the shellfish was primarily provided by fat and carbohydrates ,and that the blood clam had the energy budge equation of 100C=26 .12F+30 .75R+5 .78U+37 .35P at a salinity of 18 ,and of 100C=25 .06F+32 .03R+5 .15U+37 .76P at a salinity of 21 .5 ,which salinity from 18 to 21 .5 is of the optimal salinity range for growth in blood clam .