摄食水平对褐牙鲆幼鱼能量收支的影响

Effect of Ration on Energy Budget of Juvenile Bastard Halibut Paralichthys olivaceus (T. & S.)

褐牙鲆幼鱼 (体重 0 .71～ 4 .16 g;体长 4 .4 5～ 8.14cm)在 2 4℃下保持 5个摄食水平 (0～最大 )。投喂人工配合饵料。褐牙鲆能量和干物质的吸收效率随摄食水平的增加而增加 ,平均为97.38%和 76 .73%。褐牙鲆排粪能 (F )占摄食能的比例为 0 .95 %～ 2 .83% ,随摄食水平的增加而减少 ;氮排泄 (U)占摄食能比例为 5 .5 2 %～ 6 .77% ,各摄食水平下变化不大 ;标准代谢耗能 (Rs)占摄食能比例为 1.0 5 %～ 7.82 % ,随摄食水平的增加而减少 ;在各摄食水平条件下 ,摄食代谢耗能(Rf)占摄食能比例变化不大 ,平均为 4 5 .72 % ;生长能 (G)占摄食能比例为 32 .6 7%～ 4 9.2 1%。随摄食水平增加而增加。在最大摄食水平时 ,褐牙鲆能量分配形式为 :10 0 C =0 .95 F + 5 .5 2 U +4 4.31R+ 4 9.2

Energy budget for the juvenile b astard halibut, Paralichthys olivaceus (T. . S.), (body weight:0.71～4 .16g, body length :4.45～8.14cm) was carried out at temperature 24℃ for five ra tion sizes from starvation to maximum fed with artificial pallet. Food consumpti on, growth, standard metabolism, nitrogen excretion and absorption efficiency we re directly determined, and feeding metabolism was calculated indirectly from en ergy budget model. There seemed to be a linear interrelationship between faecal production, nitrogen excretion and ration size. The absorptive efficiencies for energy and dry weight increased with ration size, averaged 97.38% and 76.73%, respectively. Based on the information of ration size, energy lost in standard metabolism, faecal production and growth were accounted for 1.05%～7.82%, 0.95% ～2.83% and 32.67%～49.21% respectively. Nitrogen excretion and feeding metaboli sm were not significant to ration size, amounted for 5.77% and 45.72% of overall energy, respectively. The energy budget under the condition of maximum ration c ould be yielded to: 100C = 0.95F + 5.52U + 44.31R + 49.21G, where C, F, U, R and G represent food consumption, faecal production, nitrogen excretion , metabolism and growth, respectively.