【摘要】 选取同一种饵料设置7个投饵率水平(分别为体重的1.0%、1.5%、2.0%、2.5%、3.0%、3.5%、4.0%),采用静水连续充气养殖系统,在盐度为26.0-27.5、温度为27.8-26.5℃的条件下对黑鲷(Sparus macrocephalus)成鱼和黑鲷鱼种进行为期40 d的生长实验。结果表明:(1)黑鲷成鱼和鱼种的相对增重率、特定生长率、饲料转化率的变化趋势基本相同,即随着投饵率的增加,黑鲷的饲料转化率逐渐下降,相对增重率先升高后下降。但是在各指标的变化幅度上,黑鲷鱼种远大于黑鲷成鱼。(2)黑鲷成鱼和鱼种的水分含量随投饵率的增高而下降,脂肪含量随投饵率的升高而增加。(3)适宜投饵率随着黑鲷体重的增加而降低,黑鲷鱼种的适宜投饵率为其体重的3.0%,黑鲷成鱼的适宜投饵率为其体重的2.5%。更多还原

【Abstract】 A growth experiment was conducted under the conditions of temperature 27.8-26.5 ℃,salinity at 26.0-27.5,to determine the optimum feeding rate and the effects of different feeding rates on the growth performance of Sparus macrocephalus were studied.Seven feeding rates from 1.0% to 4.0%(at 0.5% increments) body weight per day(BW/day)were used in this test.A identical diet was given to adult and larval Sparus macrocephalus for 40 d.The main result showed that ⑴The variation of percent body weight increase(BWI %),specific growth rate(SGR)and food conversion efficiency(FCE)of different individuals were generally similar.FCE were decreased with the increase of feeding rate,percent body weight increased at first and decreased,the changes in larval Sparus macrocephalus were much greater than those of adults.⑵Moisture and fat content were significantly affected by feeding rate.The former decreased with the increase of feeding rate,while the latter increased.⑶The optimal feeding rate decreased with the increase of body weight,it was 3.0% of the body weight for larval and 2.5% of the body weight for adult Sparus macrocephalus.更多还原