投喂频率对绿鳍马面鲀幼鱼生长和肌肉品质的影响

为研究不同投喂频率对绿鳍马面鲀幼鱼生长性能和肌肉品质的影响,在室内循环水养殖系统中,采用人工配合饲料,以1次/d、2次/d、3次/d、4次/d等4种投喂频率,对体质量(13.8±0.83)g的绿鳍马面鲀幼鱼进行了饲养试验,试验时长为42 d。结果显示,随着投喂频率增加,绿鳍马面鲀幼鱼的终末体质量呈逐渐升高的趋势,特定生长率呈先升后降的变化趋势,其中3次/d组幼鱼的特定生长率最高,显著高于1次/d组(P<0.05);饲料系数也随着投喂频率的增加而升高,3次/d组的饲料系数显著高于1次/d组(P<0.05),4次/d组的饲料系数显著高于1次/d组和2次/d组(P<0.05);肌肉品质方面,4次/d组幼鱼的肌肉粗脂肪含量显著高于1次/d组(P<0.05),不同投喂频率组间肌肉粗蛋白质含量和灰分含量无显著性差异(P<0.05)。综合考虑生长性能和肌肉品质指标,绿鳍马面鲀幼鱼适宜的投喂频率为日投3次。

Effects of feeding frequency on growth performance and muscle quality of juvenile Thamnaconus modestus

In order to determine the optimal feeding frequency for Thamnaconus modestus juvenile,the effects of different feeding frequencies on growth performance,feed utilization and muscle quality were studied.T.modestus juveniles(n=360)with average body weight of(13.8±0.83)g were randomly allocated into 4 groups with 3 replicates per group and 30 fish per replicate.The fishes were cultured in recirculating aquaculture system for 42 days and fed four times,three times,twice,once per day.The results showed as follows:(1)with the feeding frequency increasing,the final body weight and specific growth rate were increased,and the highest specific growth rate was found when the feeding frequency was 3 times per day,which was significantly higher than that of 1 time per day(P<0.05);(2)feeding 3 times per day could significantly increase the feed coefficient compared with feeding once per day(P<0.05),and feeding 4 times per day could significantly increase the feed coefficient compared with feeding twice per day(P<0.05);(3)feeding 4 times per day could significantly increase the muscle crude lipid content compared with feeding 4 times per day(P<0.05),and there was no significant difference between muscle crude protein content and ash content among different feeding frequencies(P<0.05).Results of the present study suggest that the optimal feeding frequency of juvenile T.modestus was 3 times per day under the recirculating aquaculture system.