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首页> 外文期刊>Bulletin of Animal Health and Production in Africa >THE EFFECT OF WIND SHEAR STRESS IN WATER QUALITY IN NET CAGE FISH FARMING IN A LAKE OPEN WATER COURSE - THE CASE STUDY OF NHAMBAVALE LAGOON, GAZA PROVINCE, MOZAMBIQUE
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THE EFFECT OF WIND SHEAR STRESS IN WATER QUALITY IN NET CAGE FISH FARMING IN A LAKE OPEN WATER COURSE - THE CASE STUDY OF NHAMBAVALE LAGOON, GAZA PROVINCE, MOZAMBIQUE

机译：湖北省湖北渔具养鱼水质中风剪应力在水质中的影响 - 以莫桑比克加沙省Nhambavale Lagoon的案例研究

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Fish farming in net-cages in open water courses entails high stocking density which is associated with a high load of pollution.The water renewal in these systems is through either advection or turbulent diffusion or both.This study examined the roleof wind shear stress in stimulating vertical turbulent diffusion, water renewal and improving water quality in net-cage culture of tilapia species Oreochromis mossambicus in open water courses in Nhabavale Lagoon, using Dissolved Oxygen (DO) and the Biochemical Oxygen Demand (BOD) as water quality indicators. Water renewal was assumed to be due to turbulent diffusion driven by wind shear stress. DO and BOD were measured inside the cages and at a remote place outside the cages at 08:00 hours, over a period of one month (September - October 2014). Statistical analyses of variance.ANOVA, with confidence intervals were performed to compare the parameters inside and outside the cages.The water quality parameters were linearly regressed with wind shear stress to investigate the influence of this in the renewal of water in the net-cages.The results indicated that the water temperatures were at the lower limit of the optimum range for tilapia growth, that there were significant differences between the water quality parameters OD and BOD but no significant differences with respect to the water temperature inside and outside the cages; the OD and BOD were positively and negative linearly correlated with the wind shear stress, respectively, with the coefficientof goodness of fit ^=0.20 for both, and coefficients a=0.1 (p=0.2l) and a=-0.06 (p=0.02) for OD and BOD, respectively. It was concluded that wind shear stress stimulated directly the dissolution of oxygen in water, promoted turbulence and vertical mixing, contributing by 20% to water renewal and reduction in the density of organic matter, which ultimately resulted in improved water quality in the net-cages.
机译：开放水课程中网上养殖养殖课程需要高的储量密度，这与高负荷污染有关。这些系统中的水更新是通过平流或湍流扩散或两者。本研究检测了刺激风剪应力的作用在Nhabavale泻湖的Nhabavale Lagoon中罗非鱼种类乌斯莫斯·穆斯曼族网笼培养中的垂直湍流扩散，水更新和提高水质，采用溶解氧（DO）和生物化学氧需求（BOD）作为水质指标。假设水更新是由于风剪应力驱动的湍流扩散。在一个月（2014年9月 - 10月）的时间内，在笼子里和笼子以外的围场，在笼子外的偏远地方测量。进行统计分析。进行置信区间的统计分析，以比较笼内内外的参数。水质参数与风剪应力线性回归，以研究净笼中的水更新中的影响。结果表明，水温在罗非鱼生长的最佳范围内下限，水质参数OD和BOD之间存在显着差异，但与笼内内外的水温没有显着差异; OD和BOD分别与风剪应力呈正线和负线性相关，其均匀的贴合作效率^ = 0.20，并且系数a = 0.1（p = 0.2l）和= -0.06（p = 0.02） ）对于OD和BOD分别。结论是，风剪应力直接刺激水中氧气，促进湍流和垂直混合，促进20％的水更新和有机质密度的降低，这最终导致了网上的水质提高了水质。

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