共查询到19条相似文献，搜索用时 203 毫秒
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河蟹工厂化育苗中人工半咸水的净化与循环利用 总被引：3，自引：0，他引：3
采用室内，室外大循环的水交换形式及生物净化和物理，化学处理相结合的方法，对河蟹育苗废水进行净化与循环利用，可将育苗用人工半咸水的利用率提高２－３倍，节约配水原料５０％。另外把育苗废水的生物净化与单胞藻，轮虫的培养结合在一起，既可净化水质，又能为蟹苗提供大量的生物饵料，试验池蟹苗的成活率较对照池提高１．０－２．５％。 相似文献
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河蟹工厂化育苗中人工半咸水的净化与循环利用研究 总被引：1，自引：0，他引：1
采用室内、室外大循环的水交换形式，将生物净化和物理、化学处理相结合对河蟹育废水进行净化与循环利用，可提高育苗用水利用率2—3倍。节约配水原料50％以上，同时把生物净化与单胞藻，轮虫的培养结合在一起，既达到了净化育苗废水的目的，又为蟹苗提供了大量的生物饵料．蟹苗成活率较对照池提高2．5％． 相似文献
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以膨胀珍珠岩为滤料对工厂化养鱼池的排出水进行过滤,去除其中的悬浮固体,同时利用组合式生物填料吸附并降解水中的有机物.采用这种物理过滤和生物膜法相结合的方法净化处理养鱼水,当水循环系统处于稳定状态时,可以使处理后的水质各项指标达到渔业用水水质标准,从而实现养殖用水的循环使用. 相似文献
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利用工厂余热水进行水产养殖,必须对鱼池排放水作净化处理,延缓结垢时间。本文介绍的过滤池兼有物理,化学和生物三种水处理性能,采用强振装置(振动棒),结合水力的上下冲洗,将滤料表面和其间的污物除去。据实验,87.6立方米的滤料,2个人在2小时内即可冲洗完毕,效果极佳。 相似文献
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轮虫培养过程中生长及环境变化特征分析 总被引：9，自引：1，他引：8
通过1000ml烧杯、5L全自动生物反应器、常规的大池（5m^3）以及加处臭氧和生物过滤装置的大池（约5m^3）这四种培养系统,对在轮虫培养过程中轮虫的生长特征,以及pH、溶氧、氨氮及亚硝态氮等水质参数变化特征进行了较系统的探讨,研究结果可为轮虫密度培养工艺及培养系统的优化奠定基础。 相似文献
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对水产养殖系统中尾水处理的现状背景进行了阐述,以此提出运用各类技术解决养殖水体污染问题的必要性;围绕机械过滤技术、物理调水技术、凝絮剂应用技术、藻类净水技术、微生物净水技术等技术手段,从物理、化学、生物三个角度提出了水产养殖系统尾水处理的有效方法。 相似文献
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Diluted pig manure was treated in an algal-bacterial system in outdoor algal ponds. The pond effluent was fed once or twice daily to an indoor 501 rotifer culture. Depending on the algal-bacterial biomass concentration in the pond effluent, rotifer cultures containing 200–580 animals per ml could be obtained. Biological, physical and chemical data on the algal pond and the rotifer culture effluent were recorded. 相似文献
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Improved performance of an intensive rotifer culture system by using a nitrifying inoculum (ABIL) 总被引：1，自引：0，他引：1
G Rombaut R Grommen Q Zizhong V Vanhoof G Suantika P Dhert P Sorgeloos & W Verstraete 《Aquaculture Research》2003,34(2):165-174
Abstract A dense nitrifying culture (ABIL) has been examined for its capacity to stimulate rotifer growth in a labscale culture system. The nitrifiers were applied in different ways. When ABIL was added directly to rotifer batch cultures, it gave rise to significantly higher population densities (factor 1.5–2.5 higher, P < 0.05). The nitrifiers were subsequently examined for their capacity to enhance the start-up of bioreactors, commonly installed in aquaculture rearing tanks. Of the different carrier materials used in these bioreactors, i.e. CaCO3 , gravel and a PVC matrix (Bionet), CaCO3 gave by far the best results. In a third set of experiments, effectively nitrifying bioreactor systems were connected to rotifer culture tanks and operated over a period of up to 10 days. It was demonstrated that the ABIL inoculated CaCO3 -based bioreactor allowed excellent rotifer growth reaching rotifer densities up to 5500 rotifers per mL. Moreover, a new system in which the ABIL culture was recirculated through hollow fibres was developed and demonstrated to be effective for supporting rotifer growth up to 3500 rotifers per mL. Overall, the use of the dense nitrifying culture either in seed batch cultures, conventional bioreactors or hollow fibre bioreactor systems in support of rotifer cultures was demonstrated to be effective for improving the water quality and the rotifer growth. 相似文献
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Recent advances in the high-density rotifer culture in Japan 总被引：1，自引：1，他引：0
The success of rapidly growing aquaculture industry depends on the steady supply of fish seeds. Appropriate food for initial larval stages is critical for mass scale fish seed production. Live food found better over artificial food for fish larvae culture. Rotifers have been found to be the best live food for feeding fish larvae in early life stage. Attempts have been made to develop viable techniques for the production of rotifer through batch, continuous, and semi-continuous culture methods. In order to feed increased number of fish larvae, rotifer need to be cultured under high-density method. Various efforts have been made for increasing culture density of rotifer. In Japan, stable high-density culture of rotifer has been developed in commercial scale at a rate of 20,000–30,000 ind. ml?1. Later on, ultra-high-density rotifer culture (160,000 ind. ml?1) was found successful, which can fulfill the increased demand for rotifer as fish larval food. Furthermore, a scope of alternative use of rotifer can be explored. The development of the high-density rotifer culture method in Japan has been reviewed. The considerations of the associated nutritional requirements, microbial aspects, and prospects of high-density culture have been discussed. 相似文献
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Strategies to sustain rotifer peak biomass, distribution of rotifer resting eggs in the sediment, and relationship between rotifers and larval fish growth were studied in a series of pond experiments. After the ponds were filled with water, herbivorous rotifers (e.g., Brachionus calyciflorus ) developed first, but were gradually replaced by predatory rotifers (e.g., Asplanchna ). Subsequently, herbivorous cladocerans (e.g., Moina sp) eventually replaced rotifers and dominated the zooplankton community. The occurrence of Asplanchna and Moina indicated the decline of B. calyciflorus . Peak rotifer biomass developed 8–10 d after the ponds were filled with water at 20–25 C, 10–15 d at 17–20 C, 15–20 d at 15–17 C, 20–30 d at 10–15 C, and >30 d at < 10 C. The abundance of resting eggs in the top 5-cm sediment varied from 6 to 83/cm2 . About 25% of resting eggs were buried in the top 5-cm sediment but the number of resting eggs decreased with increased sediment depth. Optimum rotifer biomass for silver carp Hypophthalmichthys molitrix larvae stocked at 1,500,000/ha was 20–40 m/gL. High rotifer biomass (>20 mg/L) usually lasted 3–5 d, but could be prolonged by pond fertilization or cladoceran controls. A weekly application of dipterex at 0.05 mg/L reduced cladoceran biomass but enhanced rotifer biomass. Our results indicate with a careful management plan it is possible to synchronize the rotifer development with larval fish stocking. 相似文献
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浮游生物在盐碱地封闭式对虾养殖中的生态作用 总被引：4，自引：0，他引：4
盐碱地封闭式南美白对虾养殖池中,浮游植物生物量7.0233～66.9334mg/L,平均36.0076mg/L;浮游动物生物量3.127～26.3851 mg/L,平均10.2240mg/L。盐碱地混盐水体中常出现轮虫,而海水池塘较少。色球藻、蓝纤维藻、席藻、螺旋藻等蓝藻门的种类表现出较强的广盐性。并就浮游生物在对虾养殖中的重要作用进行了分析。 相似文献
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河蟹池塘养殖底层微孔曝气增氧技术的研究和应用 总被引：3，自引：0，他引：3
在2007年-2008年通过底层微孔曝气技术的开发应用,开展了河蟹池塘养殖增氧研究。结果表明养成河蟹规格和单产显著提高,池底增氧技术是河蟹池塘养殖中的关键控制技术,示范区、推广区河蟹的平均规格、单产、毛利比同期常规技术的一般平均水平分别提高了11．37％～36．26％、7．07％～28．49％;50．29％～71．67％、49．11％;177．51％．187．31％、122．2％;养蟹池塘水体DO、NH3-N、NO2—N、TN、TP、COD等主要水质指标明显优于对照池,总体达到地表水环境质量标准（GB3838—2002）Ⅲ类以上,并实现了养殖期内零排放,是一项节水、环保的新型水产养殖技术。 相似文献
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室内集约化养虾池以低频率运转水处理系统调控水质效果及氮磷收支 总被引：3，自引：0，他引：3
采用低频率运转循环水处理系统(含粗滤器、臭氧仪、气液混合器,蛋白分离器、暗沉淀池等)联用池内设施(微泡曝气增氧机与净水网)开展凡纳滨对虾室内集约化养殖实验。研究了养虾池以水处理系统调控水质效果及氮磷收支。结果表明,养虾水经系统处理后,NO2-N(53.4%～64.5%)、CODMn(53.4%～94.4%)与TAN(31.6%～40.4%)被显著去除,有效改进虾池水质;养殖周期内未换水与用药,虾池主要水化指标均控制在对虾生长安全范围,7号实验池(100 d)与8号对照池(80 d)主要水化指标变化范围:DO分别为 5.07～6.70 mg/L和4.38～6.94 mg/L,TAN 0.248～0.561 mg/L和0.301～0.794 mg/L,NO2-N 0.019～0.311 mg/L和0.012～0.210 mg/L,CODMn 10.88～21.22 mg/L和11.65～23.34 mg/L。7号池对虾生长指数优于8号池(80 d虾病暴发终止),单位水体产量分别为1.398 kg/m2与0.803 kg/m2。氮磷收支估算结果:7号与8号池饲料氮磷分别占总收入:氮93.70%与92.37%,磷98.77%与99.09%;初始水层与虾苗含氮共占总收入6.30%与7.63%,磷共占1.23%与0.91%。总水层(含排污水)氮磷分别占总输出:氮56.45%与59.86%,磷53.26%与55.79%;收获虾体氮磷分别占总输出:氮37.07%与31.94%,磷21.37%与13.11%。7号池饲料转化率较高;池水渗漏与吸附等共损失氮磷分别占总输出:氮7.00%与9.34%,磷25.37%与31.10%。实验结果表明,虾池以低频率运转循环水处理系统联用池内设施可有效控制水质与虾病,具较高饲料转化率。 相似文献