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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Metabolic demand and growth of juveniles of Centropomus parallelus as function of salinity
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Metabolic demand and growth of juveniles of Centropomus parallelus as function of salinity

机译：盐度对平行对虾中枢幼鱼的代谢需求和生长

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摘要

The effect of salinity and time of exposure on metabolism and growth of juveniles of fat snook, Centropomus parallelus, were investigated. Food conversion efficiency (FCE), specific growth rate (SGR), oxygen consumption, ammonia excretion rate and O:N (oxygenitrogen) ratio were assessed on groups of fat-snook (mean weight 2 g) acclimated for 15 - and 30-day periods, to 5 per thousand, 20 per thousand and 30 per thousand salinities. For 15-day period, differences between FCEs as well as SGRs at different salinities were not significant. For 30-day period, however, these differences were significant between 5 per thousand and the other salinities, with the highest and lowest values at 5 per thousand and 30 per thousand, respectively, for both parameters. Salinity and acclimation period exerted significant influence on the oxygen consumption, ammonia excretion and the O:N ratio of juveniles of C. parallelus. The lowest and highest oxygen consumption was at 20 per thousand for 15- and 30-day period, respectively. Differences in oxygen consumption between fishes maintained at 5 per thousand and at 30 per thousand were not significant, at each period, while between those maintained at 5 per thousand and 20 per thousand, and at 20 per thousand and 30 per thousand differences were significant. Ammonia excretion rates were significantly different between all salinities, at each period, and between periods at each salinity, except at 30 per thousand. The highest and lowest rates were found at 5 per thousand and 30 per thousand, respectively. The highest O:N ratio for 15-day period was at 30 per thousand with no difference between those at 5 per thousand and 20 per thousand. For 30-day period, differences of O:N ratio were significant between salinities. The effect of acclimation period on the O:N was significant only at 20 per thousand. Although C. parallelus is a fish species adapted to face a wide variation of environmental salinity, results show that juvenile fishes kept at different salinities, in laboratory, found better condition to efficiently channel the energy of food into growth at 5 per thousand for both acclimation periods.
机译：研究了盐度和接触时间对脂肪sn蛇（Centropomusus parallelus）幼鱼的代谢和生长的影响。在适应15至30岁的胖子（平均体重2克）组中评估了食物转化效率（FCE），比生长速率（SGR），耗氧量，氨排泄速率和O：N（氧/氮）比。天周期，达到每5盐度，20盐度和30千盐度。在15天内，不同盐度的FCE和SGR之间的差异并不显着。然而，在30天期间，这些差异在每5个盐度和其他盐度之间是显着的，两个参数的最高和最低值分别为5个千分率和30个千分率。盐度和驯化期对C.parallelus幼鱼的耗氧量，氨排泄量和O：N比率有显着影响。 15天和30天的最低和最高耗氧量分别为每千人20。在每个时期保持在每千分之五和百分之三十的鱼之间的耗氧量差异不显着，而保持在每千分之五和百分之二十，以及分别在千分之二十和千分之三之间的氧气消耗量差异是显着的。各个时期的所有盐度之间以及各个时期的各个盐度之间的氨排泄率都存在显着差异，但每千盐中的氨排泄率则为千分之三。最高和最低比率分别为千分之五和千分之三十。 15天期间最高的O：N比率是千分之30，而千分之五和千分之二之间没有差异。在30天期间，盐度之间的O：N比差异显着。适应期对O：N的影响只有千分之二十。尽管C.parallelus是适应各种环境盐度变化的鱼类，但结果表明，保持不同盐度的幼鱼在实验室中发现了更好的条件，可以有效地将食物的能量以每千分之5的比例转移到生长中期。

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