溶氧水平对黄颡鱼稚鱼摄食、生长及呼吸代谢的影响  

Effects of dissolved oxygen on feed intake,growth and respiratory metabolism of juvenile Pelteobagrus fulvidraco R.

作　　者：杨凯[1] 樊启学[1] 张磊[1] 杨磊[1] 周华[1] 李波[1] 方巍[1] 

机构地区：[1]华中农业大学水产学院/农业部淡水生物多样性保护与利用重点开放实验室,武汉430070

出　　处：《淡水渔业》2010年第2期24-29,共6页Freshwater Fisheries

基　　金：国家科技支撑计划项目(No.2007BAD37B02);湖北省"十一五"重大科技攻关项目(No.2006AA203A01)

摘　　要：在（28±0.5）℃循环水环境中设置4种溶氧水平,分别为2.92 mg/L（G1组）、4.71 mg/L（G2组）、6.77 mg/L（G3组）、9.68 mg/L（G4组）,研究初始体重为（1.62±0.02）g的黄颡鱼（Pelteobagrus fulvidracoR.）稚鱼的生长、摄食及呼吸代谢规律。结果显示：G3组特定生长率（SGR）、饲料效率（FE）均显著高于其它各试验组（P〈0.05）。试验鱼的耗氧率、排氨率与溶氧水平无正相关性,G3组的耗氧率、排氨率始终显著高于其它三组。第6周测定发现：摄食后1-4 h内耗氧率和排氨率均呈现迅速上升,到达最大值后再缓慢下降,二者均在09∶00和21∶00出现高峰,G3组的耗氧率高峰值分别为0.345、0.331 mg/g.h,G3组的排氨率高峰值分别为24.194、17.770μg/g.h。结果表明：不同溶氧条件下,黄颡鱼稚鱼的耗氧率、排氨率变化过程具有类似的特征,二者在能量代谢机制上相互关联;在6.77 mg/L的溶氧水平下,黄颡鱼稚鱼生长最快、呼吸代谢最为旺盛。A 6-week feeding experiment was conducted to investigate the effects of dissolved oxygen （DO） levels on feed intake, growth and respiratory metabolism of juvenile Pelteobagrus fulvidraco R. （ initial weight： 1.62 ± 0.02 g per fish） reared in 300-L indoor flow-through circular fiberglass tanks in 28 ± 0. 5 ℃. Four DO levels were named as G1 （ hypoxia, 2. 92 mg/L） ,G2 （moderate hypoxia,4. 71 mg/L）, G3 （saturation,6. 77 mg/L） and G4 （super-saturation,9. 68 mg/L）, respectively. The results showed that specific growth rate and feed efficiency were significantly higher in the normoxic group （ G3 ） than in the other groups （P 〈 0. 05）. The oxygen consumption and ammonia excretion rate of experimental fish had no direct correlation with dissolved oxygen, which was significantly higher in the saturation （G3） than in the other three groups. The experiment after six weeks showed that after the tested fish ate its food in 4 hours, both the oxygen consumption and ammonia excretion rates increased drastically, and reached their maximum levels, then decreased slowly towards to their nomal levels. At 09：00 and 21：00 ,the highest oxygen consumption rate were 0. 345 mg/g · h and 0. 331 mg/g · h and ammonia excretion rate were 24. 194 μg/g · h and 17. 770 μg/g ·h in the saturated group （G3）. This study suggested that response in the rate of ammonia excretion in juvenile P. fulvidraco was close to response in the oxygen consumption, and 6. 77 mg/L DO was considered to be most suitable for growth and respiratory metabolism.

关 键 词：黄颡鱼(Pelteobagrus FULVIDRACO R.) 溶氧 生长 耗氧率 排氨率 

分 类 号：S966.4[农业科学—水产养殖] Q178.1[农业科学—水产科学]