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为把握池塘水体各水质因子的昼夜变化和上下层水体的差别,2016年6月2日~3日,对渤海湾南部海水养殖池塘的温度、溶解氧、pH和氧化还原电位进行了24h连续监测,监测从2日9:00开始,每隔1h测量一次。结果表明池塘水体上层的各水质因子数值高于下层水,各水质因子之间显著相关,一起跟随太阳辐射的变化而变化。上层水的温度、DO和pH都有一个缓慢升高的过程,达到最高值以后逐渐降低,温度在14:00达到最高值,DO在17:00达到最高值,pH在20:00达到最高值,ORP波动较大,23:00达到最高值。下层水的各水质因子波动较大,没有明显的变化规律。 相似文献
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我们对欧鳗土池养殖水环境周年变化进行了研究,以期为七池欧鳗养殖的水质调控提供科学依据,进而探求水质生态因子对欧鳗养殖的影响及水质综合调控的有效措施。 相似文献
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养鱼池塘中,水质的管理和调节是整个养鱼过程都应注意的问题。夏季是鱼类生长旺盛的季节,又由于夏季温度高,日照时间长,向鱼塘中投饵施肥较多,鱼塘水质容易变坏,造成鱼类缺氧浮头,在气温高、气压低的闷热天气,甚至会泛塘,此外,鱼病的发生和蔓延也与鱼塘水质有密切关系,因此,夏季特别要重视鱼塘水质的调节。 相似文献
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池水是鱼类赖以生存的环境,水质的好坏直接关系到鱼类能否健康生长和产量的高低.在鱼类生长最旺盛的夏季,由于机体代谢能力强,水中微生物活跃,致使池塘水质变化较快.如果长期不采取水质调控,导致池水老化,将严重影响鱼类生长,更甚者将导致鱼病的发生及流行.为了更多地获益,池塘水如何进行水质调控呢? 相似文献
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俗话说:“养鱼有得巧,全靠水质好”。保持池塘良好的水质是夺取养鱼高产的一项重要措施。夏季是鱼类生长的旺期,由于大量投饵施肥,水质容易变坏,影响池鱼的健康成长,因此,夏季应注意池塘水质的调节。 相似文献
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几种鱼蟹池塘混养效果的比较朱文祥,邵贻钧,俞金安(上海市水产技术推广站,200433)(松江县水产技术推广站,201600)上海郊区的池塘养鱼已实现了大面积高产,淡水商品鱼供应趋于缓解。可是,高风险、高投入的池塘养鱼业如何获得较高收益,这是一项新的课... 相似文献
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对黄河下游利津重盐碱地池塘的水化学进行了分析。结果表明:1.该类水体水型为ClNⅡa,总含盐量899.6~3 336.6 mg/L,在阴离子中,Cl-〉SO24-〉HCO3-+CO32-,其含量分别为703.52 mg/L、302.83 mg/L和167.82 mg/L。阳离子的含量顺序为K++Na+〉1/2 Mg2+〉1/2Ca2+,其含量分别为479.43mg/L、92.21 mg/L、72.29 mg/L。2.各塘总碱度平均值为2.12~4.29 mmol/L,其组成主要是HCO3-碱度;pH为8.37~8.96,极值范围为8.10~10.39;总硬度含量较高,各塘平均在8.08~14.35 mmol/L,极值范围为7.05~17.20 mmol/L;养鱼池塘的Ca2+含量大于Mg2+含量,而养虾池塘Mg2+含量大于Ca2+的含量。3.氮的含量较适合浮游植物的生长,而大部分养虾池塘总磷的含量很低,但养鱼池塘总磷含量相对较高。 相似文献
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2017、2018年连续2年利用7口0.4 hm2(6亩)对虾养殖池在淡水条件下进行了鲻鱼与南美白对虾混养试验.试验结果:鲻鱼放养规格48~80 g/尾,放养密度为75~225尾/hm2,收获鲻鱼规格为420~520 g/尾.2017年,南美白对虾单养池(对照池)产量为6090 kg/hm2,6口鱼虾混养池产量分别比对... 相似文献
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高位虾塘细菌数量变化特点及其与理化因子的关系 总被引:1,自引:0,他引:1
本试验选取两口凡纳滨对虾高位池塘,通过连续地周期性采样和测定分析,研究了虾池异养细菌数量和弧菌数量变动规律及其与理化因子的相关关系。结果表明:两口试验虾池异养细菌数量变化范围在9.07×10^3~2.13×10^5 cfu/mL之间,平均为6.45×10^4 cfu/mL,呈现持续缓慢上升的趋势;两口试验虾池的弧菌数量变化趋势较为一致,变化范围为2.12×10^2~2.91×10^3 cfu/mL,养殖生产前期较低,中期高,后期随着换水量的加大而有所下降。相关性分析表明:虾池水体的异养细菌和弧菌数量均与透明度、 DO、 pH 呈负相关,与COD、 TSS含量呈正相关,其中弧菌数量与TSS含量呈显著正相关( P〈0.05)。 相似文献
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Rom Moav G. Wohlfarth G.L. Schroeder G. Hulata H. Barash 《Aquaculture (Amsterdam, Netherlands)》1977,10(1):25-43
In 1974 and 1975 nine experimental treatments of fish polyculture in stagnant water ponds without aeration were conducted at Dor. The polyculture was composed of common carp, silver carp, white amur (grass carp) and Tilapia. The treatments differed in stocking densities, feeding and manuring levels. The most productive treatment of the experiment, in which the fish were fed with protein-rich pellets, produced 50 kg/ha per day, probably a record for unaerated ponds of stagnant water. Two treatments (low and high stocking densities) fed exclusively with liquid cow manure produced an average yield of around 32 kg/ha per day. The yields of the treatments receiving high-protein pellets exceeded those of the treatments receiving grain pellets by 20 and 9.6 kg/day per ha, at high and low stocking densities, respectively, and in both cases the yield increments justified the extra cost of high-protein feed. The responses of the four fish species to the different levels of feeding and stocking densities were widely different. The common carp and white amur showed the greatest responses to increased feeding inputs while the silver carp and Tilapia, even at high densities, have done equally well at low feeding levels. Total body fat contents of the common carp were 20%, 15% and 6.2% when fed with high-protein pellets, grains pellets and liquid cow manure, respectively. Intermittent harvesting did not result in increased yields. 相似文献
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模拟自然生态法河蟹、泥鳅混养试验 总被引:1,自引:0,他引:1
针对我县池塘 (尤其是大水面提水池塘 )养蟹规格偏小 ,价格低 ,效益差的实际情况 ,我们于2 0 0 0~ 2 0 0 1年进行了蟹池模拟自然生态法混养泥鳅试验 ,现将具体试验情况总结如下。1 材料与方法1 1 池塘 试验在本县楼王镇范河村养殖户王俊良塘口进行 ,该塘是利用低产农田 ,在四周挖沟筑堆的鱼池 ,面积 2hm2 。沟深 1 2m ,宽 8m ,沟的面积占池塘总面积的 12 % ,外堆圩坚固不渗漏 ,高于历史最高水位 0 5m以上。滩面能提水 1 2m左右。水源充足 ,水质良好 ,注、排水方便并分开 ,通电和水陆交通便利。每池配备 1t水泥船 1条 ,抽水机泵 … 相似文献
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Sediment samples were collected from 42 catfish (Clarias hybrid) ponds, 40 freshwater prawn (Macrobrachium rosenbergii) ponds and 18 carp (Puntius spp.) ponds in Thailand. Regression analysis revealed that pond age (1–30 years) was not a major factor influencing the physical and chemical composition of pond sediments. Sediment depth, F+S horizon thickness and bulk density of S horizon were greater (P<0.05) in carp ponds than in catfish and prawn ponds. This occurred because sediment was removed from catfish and prawn ponds more frequently than from carp ponds. Total carbon, organic carbon and total nitrogen concentrations were greater (P<0.05) in carp ponds than prawn and catfish ponds. Few ponds had sediment organic carbon concentrations above 3%, and carbon:nitrogen ratio values did not differ (P>0.05) among ponds for the three species. Total phosphorus and other sediment phosphorus fractions increased in the order prawn ponds, carp ponds and catfish ponds. Sediment sulphur concentrations also increased in the same order. There were no differences in major or minor nutrient concentrations in sediment that would influence aquacultural production. Although there were significant correlations (P<0.05) between various sediment quality variables, no single variable or group of variables would be useful in estimating sediment quality. Pond bottom management practices used by producers in Thailand included drying of pond bottoms between crops, liming, tilling and periodic sediment removal. These practices have maintained relatively good bottom quality. They should be continued in Thailand and adopted in other places. 相似文献
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为探索适合长江刀鲚的新的养成模式,于2020、2021年两个年度在主养菊黄东方鲀的池塘中进行了混养长江刀鲚的试验,每年养殖周期为5月中旬至11月底。试验结果:2020、2021年,菊黄东方鲀的单位面积产量分别为2 812.5、3 007.5 kg/hm2,收成规格分别为261.5、268.5 g;长江刀鲚的成活率分别为57.45%、66.90%,收成规格分别为38.6、50.7 g,单位面积产量分别为73.50、112.65 kg/hm2。试验结果表明,在菊黄东方鲀池塘中混养长江刀鲚不会影响主养对象的养成效果,且在不额外增加日常养殖生产成本(不单独投喂饵料或饲料)的情况下,能保证长江刀鲚的养殖成活率和收成规格,从而提高了养殖生产经济效益。 相似文献
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Modeling temperature distribution in freshwater ponds 总被引:2,自引:0,他引:2
A model for predicting the vertical temperature profile of turbid freshwater ponds is described. High resolution in space and time and a reduction in the number of meteorological inputs usually required by such models is achieved by using pond surface temperature as a model input. A method to estimate hourly surface temperature is proposed and demonstrated. 相似文献