摘要
在室内进行鲻鱼与凡纳滨对虾的混养试验,放养虾苗密度均为100尾/m2,设计了混养大、小规格鱼苗的处理组,混养密度分别为0、0.13、0.26、0.52、1.04、2.07尾/m2和0.13、0.26、0.52尾/m2。试验结果表明,对虾产量、规格和成活率未出现显著差异(P>0.05)。混养组对虾产量、规格总体上表现出随混养鲻鱼的密度和规格的提高而呈下降的趋势;混养鲻鱼密度最高两组(2.07、0.52尾/m2)的对虾规格、产量均小于其他混养组;混养组对虾存活率高于对照组,混养鲻鱼密度最高两组对虾成活率最高,且其鱼虾总产量显著高于其他组,其他混养组间未出现显著差异(P>0.05)。混养组的饲料系数较对照组均略有降低,混养鲻鱼密度最大组合(2.07尾/m2)的饲料系数最低,饲料转化效率有随混养鲻鱼的密度提高而略有上升的趋势,但不同处理间未出现显著差异(P>0.05)。整个试验期间不同处理间水温、盐度、溶氧、pH及生化耗氧量没有出现显著差异;氨氮含量前低后高,亚硝酸氮含量、硝酸氮含量在中后期明显升高,但未表现出与混养鲻鱼密度的明显关系。无机磷含量则在整个养殖期间较稳定,不同处理间未出现显著差异(P>0.05)。因此,混养合适密度和规格的鲻鱼不会对凡纳滨对虾产量产生负影响,可以提高对虾成活率,有利于提高饲料转化效率,对水质有一定的稳定作用。
Gray mullet Mugil cephalus juveniles were stocked into 27 tanks at a rate of 0,0.13,0.26,0.52, 1.04 ,and 2.07 ind./m^2 in large gray mullet and 0.13,0.26, and 0.52 ind/m^2 in small gray mullet and poly- cultured with Pacific white leg shrimp Litopenaeus vannamei at a rate of 100 ind./m^2 to study the effects of density and size of gray mullet on survival and growth performance of Pacific white leg shrimp in poly- culture. Results showed that there was no significant difference in the yield, size and survival of the shrimp among different groups （P^0.05）. The yield and size of shrimp were found to be decreased with the in- crease in density of the fish in polyculture,lower size and yield of the shrimp in the maximal fish density groups （2.07 fish/m^2and 0.52 fish/mz） than that in other groups. There was higher survival of shrimp in polyculture groups than that in the monoculture group, the maximal survival in the maximal fish density groups. The total yield of shrimp and fish was significantly higher in the maximal fish density groups than that in other groups, without significant difference in total yield among other polyculture groups （P~ 0.05）. The food conversion ratio was found to be lower in polyculture groups than that in the control group, the minimum in the highest fish density （2.07 fish/m^2） group,indicating that the food utilization ef- ficiency was increased with the increase in fish density, without significant differences among different groups （P^0.05）. No significant differences in water temperature, salinity, dissolved oxygen level, pH, and BOD5 were observed among different groups during the experimental period （P^0.05）, even though the contents of ammonia-N, nitrite-N, and nitrate-N were higher level in middle and later experiment than early stage （P^0.05）,and the content of inorganic phosphorus was maintained at constant level during the whole experimental period. The findings indicated that polyculture of gray mullet at suitable size and densi- ty did not lead to d
出处
《水产科学》
CAS
CSCD
北大核心
2015年第6期358-363,共6页
Fisheries Science
基金
广西科技攻关计划项目(桂科攻1222013)
广西自然科学基金资助项目(2011GXNSFA018116)
关键词
鲻鱼
凡纳滨对虾
密度
规格
混养
Litopenaeus vannamei
Mugil cephalus
density
size
polyculture
