摘要
于1994年8－11月进行4次黑鲷幼鱼摄食－生长实验，平均水温为26.8，24．4，20.1和14.8℃，每次实验分4个日粮水平（停食－饱食），分别对单位体重日氮摄取、粪便氮、氮排泄和氮生长进行测定和估计。结果表明，氮收支各组分的单位体重日平均量随日粮水平的降低而减少，氮排泄、氮生长与氮摄取、氮吸收分别呈显著的线性正相关；氮收支组分以占氮摄取百分比表示时，粪便氮、氮排泄随日粮水平的降低而增加，氮生长则是现不同的变化趋势。同时，对黑鲷幼鱼在不同的日粮水平下的氮生长效率和吸收效率进行探讨。
Four feeding-growth experiments on juvenile black porgy (Sparus macrocephalus) were carried out during August-November in 1994 at a mean seawater temperature of 26.8℃, 24.4℃,20.1℃ and 14.8℃, respectively. The fish, reared in 801 aquarium (pH = 8.0, salinity = 32), were fed Ammodytes personatus at 4 ration levels from starvation to ad libitum The introgen intake,faeces and retention were measured and the nitrogen excretion were calculated using the nitrogen balance equation (CN = FN + UN + GN ). The nitrogen intake [mg / (g. d)] increased with ration levels (%). Nitrogen fasces [mg / (g. d)] also increased with ration levels at 26.8℃ and 24.4℃, but a maximum appeared in the second highest ration levels at 20.1℃ and 14.8℃. The relationships between the nitrogen excretion and ration levels are similar to those between nitrogen intake and ration levels. At the maximum ration, nitrogen intake, fasces and retention [mg / (g. d)] decreased with decreasing temperture and increasing body weight. At starvation the nitrogen excretion [mg /(g d)] changed a little and ranged 1.04-1.41 mg / (g d).The nitrogen budget for the black porgy changed with ration levels. The nitrogen excretions as percentage of nitrogen intake are the highest among the compopents in the nitrogen balance equation,At the maximuxn rations the nitrogen excretion decreased with decreasing tempebe and increasing body weight. The nitrogen excretion (%, nitrgen intake) was positively correlated with ration levels at 26.8℃ and 14.8℃. The nitrogen retention (%, nitrogen intake) efficiency decreased with decreasing ration levels, but a maximum appeared at 4.07% of ration level, not the maximum ration,at 24.4℃. At the maximum ration, the nitrogen retention efficiencies changed in the range of 5.81%34.20%. The nitrogen retention (mg / d) was positively cormlated to nitrogen intak (mg / d) and nitrogen absorption (mg / d).
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1998年第4期368-373,共6页
Oceanologia Et Limnologia Sinica
基金
国家自然科学基金!39370542
关键词
黑鲷
氮收支
日粮水平
幼鱼
Sparus macrocephalus
Nitrogen budget
Ration level
