共查询到20条相似文献，搜索用时 188 毫秒
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针对北方地区 ,特别是黑龙江地区鱼类将在冰下度过漫长的越冬期 ,如何才能使越冬鱼类安全地度过冬季 ,是我们最关心的问题。经过多年的探讨 ,发现在越冬池中施用生石灰能调节冰下水体的水质 ,增强浮游植物活力 ,保持 1 0～ 1 5天的氧量平衡。而掌握生石灰对冰下水体生态因子的影响 ,有助于针对不同越冬池塘的水质条件 ,科学合理地施用 ,从而更好地发挥其多功能作用。本文通过连续测定施放生石灰前后一段时间内试验水体的水温、H2 S、CO2 、pH、氨氮、溶解氧、浮游生物等多项因子 ,进行化验分析 ,研究生石灰对冰下养殖水体的影响 ,从而在越… 相似文献
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光合细菌对鲤鱼消化功能及养殖环境影响的研究 总被引：1，自引：0，他引：1
本文通过光合细菌对鲤鱼肠道消化酶的变化状况、光合细菌在养殖水体中的增殖和分布规律以及它对水体中异养细菌和水质影响的研究，阐明了光合细菌在该生态系统中的作用。 相似文献
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光合细菌添加剂是一种活菌添加剂,已在河北、山东等地大规模推广使用,给渔业生产带来了可观的经济效益,在池塘对虾养殖生产上效益更为显著。光合细菌属厌气性光能自养型细菌,它能在无氧条件下利用光能,吸收利用水体中的有机物质,迅速繁殖起来,从而强化水中和池底有机物质的循环,消除水中有害物质,提高水体代谢机能,增加水中营养,使水体保持良性生态平衡。因此,在养殖水域中使用光合细菌添加剂,既能净化水质,增加水中溶氧,有效地控制泛塘,又能增加水体中的浮游生物量, 相似文献
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鲤鱼越冬池冰下浮游生物的研究黄权，孙兆和，夏艳杰，田建遥，赵文（吉林农业大学，长春１３０１１８）刘翠英，赵忠武（吉林省水产科学研究所）（吉林省永吉县水产站）我国东北地区，年封冰期长达１５０余天，越冬的鱼类要在越冬池中生活４—５个月，因此，越冬是北方地... 相似文献
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北方地区由于气候条件所致，冬季冰封期长，结冰期可达 150～ 180 d，冰层厚度可达 1～ 2 m，从而给鱼类的越冬造成了很大影响。因此，怎样使鱼类安全越冬，提高越冬鱼类成活率，是北方地区养鱼生产者不可忽视的一个重要问题。笔者在此介绍北方地区越冬鱼类死亡的原因及对策如下。 1越冬鱼类死亡的原因 1.1水质恶化 当池面结冰后与空气隔绝，然而鱼种和水生生物的代谢活动及有机物质的分解均在进行，因而会造成池中溶氧的消耗和代谢废物的积累，水质会逐渐恶化。而其中溶氧的降低往往是越冬鱼类死亡的关键因素。造成越冬水体溶氧下降的主要… 相似文献
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冬季天气寒冷,水温低,鱼类主要集中于池水底层,由于耗氧量增加,易造成底层水体缺氧,使鱼类窒息死亡,降低养殖成活率。下面介绍几种鱼池冬季补氧的办法。1.生物增氧 浮游生物在进行光合作用的同时放出氧气,是越冬水体溶解氧的主要来源。在冰封前,要有意识地向越冬池注入部分含浮游植物多的肥水,但注水量不要超过池水的1/5。如果越冬池水质清瘦,可以施入尿素和过磷酸钙各0.5kg/亩~1.0kg/亩,提高水体的肥度,但不能施用有机肥,以免污染水质。施肥时间不宜过早,最好在封冰前进行,以免藻类过早繁殖,降低越冬后期水体的溶解氧含量。2.注水补氧 … 相似文献
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光合细菌对三角帆蚌养殖水体水质的影响 总被引：4，自引：1，他引：4
将红螺菌科的红假单胞菌应用于三角帆蚌(Hyriopsis cum ingii)养殖水体,测定水化学环境因子和微生态群变化情况。结果表明,光合细菌可稳定养殖水体pH,去除氨氮、亚硝基氮、总氮,降低COD,改变水体氮磷比;光合细菌能有效控制异养细菌、弧菌、气单胞菌数量,对真菌的增殖也有一定抑制作用,避免养殖水体水质恶化。 相似文献
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为探讨江苏沿海地区海水鱼类养殖过程中的越冬问题,构建了基于温室保温与微藻净水的封闭式循环水养殖系统,用于开展黑鲷越冬试验。通过在线监测系统记录冬季运行期间系统内外水温与气温,研究太阳能温室的保温性能;通过定期采样检测养殖系统水质,比较投加微藻前后养殖池水质的差异,研究微藻净水的可行性。结果显示:冬季温室内海水循环养殖系统的平均水温显著高于温室外水温,有利于黑鲷顺利越冬并延长生长期;在养殖系统内接种微藻可有效降低水体氨氮(NH+4-N)浓度,并将亚硝酸盐氮(NH-2-N)浓度维持在较低水平,有利于维护养殖系统水质稳定。研究表明:集成温室保温与微藻净水的海水循环养殖系统可实现黑鲷越冬养殖。本研究可为存在积温不足和越冬问题的区域发展海水鱼类养殖提供参考。 相似文献
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Ingeborg M. Mulder Corey J. Morris J. Brian Dempson Ian A. Fleming Michael Power 《Ecology of Freshwater Fish》2018,27(3):785-797
Anadromous Arctic charr, Salvelinus alpinus, feed in the marine environment for several months during the summer and migrate back to fresh water in late summer to spawn and/or overwinter. While overwintering, anadromous Arctic charr are generally believed to reduce or cease feeding, and they are poorly described in their winter movement activity. This study used telemetry data collected from two locations to describe overwintering movement activity, including interindividual variation. Movement activity declined markedly during the ice‐covered period, suggesting opportunistic maintenance feeding was used as an energy conservation strategy. Fall and spring movement was correlated with daylight hours, and ice break‐up had a significant effect on the timing of outmigration. Movement activity was negatively correlated with body length, with smaller individuals being more active than larger fish. Although general activity patterns were evident, there were significant differences among individuals, particularly during spring immediately prior to lake departure. Lake size and individual differences in metabolic rate may account for some of this variation. 相似文献
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４种微生态制剂对虾池水质及青虾生长性能的影响 总被引：2，自引：0，他引：2
在测定养殖水体pH值、溶解氧、氨态氮、亚硝态氮等水质指标和养殖青虾肥满度、平均规格、饲料系数等生长性能指标的基础上,比较研究了全池泼洒复合芽孢杆菌、EM菌、类球红细菌、超浓缩光合细菌微生态制剂对养殖水质的改善情况及提高杂交青虾"太湖1号"生长性能的效果。结果表明,4种微生态制剂均可改善水质;其中,芽孢杆菌与EM菌具有较强的降亚硝态氮功能,类球红细菌和EM菌具有较强的降氨态氮作用。4种试验菌剂的调水效果排序为:类球红细菌>EM菌>复合芽孢杆菌>超浓缩光合细菌。4种菌剂不同程度提高了青虾的生长性能;其中,类球红细菌效果最为显著,其次为EM菌、复合芽孢杆菌,而光合细菌的效果不显著。 相似文献
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C. Skov J. Brodersen P.A. Nilsson L.-A. Hansson C. Brönmark 《Ecology of Freshwater Fish》2008,17(3):406-415
Abstract – This study used passive telemetry (passive integrated transponders) to evaluate winter migration in three species of cyprinids (roach ( Rutilus rutilus (L.)), white bream ( Blicca bjoerkna (L.)) and rudd ( Scardinius erythrophthalmus (L.))) and their potential predators (pike ( Esox lucius (L.)) and perch ( Perca fluviatilis (L.))) between a shallow lake and its streams. Migration patterns were investigated from October to June, and a substantial part of the roach (40%) and white bream (55%) populations tagged in the lake during autumn migrated during winter into the streams, whereas only very few piscivores (<2%) migrated. In contrast to roach and white bream, only few rudd (<6%) migrated, which is likely a consequence of different overwintering strategies, e.g., rudd overwintering in shallow highly structured habitats. Small rudd migrated more than larger rudd, whereas there were no size-differentiated migration patterns for roach or white bream. Migration of the cyprinid fishes was generally initiated in late October and ended in May, and specific synchronised bursts of migration were observed in December, January and April, suggesting that migration is triggered by one or more proximate environmental cues. The cyprinid fishes generally entered the streams in late afternoon or in the morning, depending on season, but overall migration patterns varied between the three streams. We suggest and discuss that our results have great implications for lake management as well as for the interpretation of seasonal trophic dynamics in shallow lakes. 相似文献
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河蟹人工育苗池水循环净化处理技术研究 总被引：1，自引：0，他引：1
采取在养殖池内投放和接触氧化水循环处理装置内接种挂膜光合细菌、硝化细菌和放线菌等环境有益微生物 ,并与微藻、光合细菌等活饵料应用技术相结合的池水净化循环处理技术 ,通过基础试验和生产性试验进行了研究考察 ,结果表明本方法可使育苗池水循环利用 ,降低生产成本 ,减少对周边水环境的污染。试验苗池溶解氧 (DO)高于 7 5mg/L ,氨氮低于 0 5mg/L ,水质明显优于对照苗池 ,符合河蟹育苗要求。试验苗池蟹苗总成活率 19 4 % ,产量 175 8g/m3 ,蟹苗成活率、产量和质量均明显优于对照苗池 相似文献
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刺参体内的新病原--一种球状病毒 总被引：3，自引：0，他引：3
2004年12月中下旬~2005年4月对辽宁沿海地区刺参越冬苗发病严重地区,进行了跟踪调查分析。调查结果显示,2004年刺参越冬苗发病比往年早,来势凶猛,持续时间长,流行面广,具较明显的流行病特征,病症异于往年,发病厂家达50%以上,部分地区超过80%,严重地区80%~90%;从患病参体内分离出2株优势细菌和一种新的球状病毒,经负染和超薄切片在电镜下观察,证实有大量球状病毒存于参体内。 相似文献
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光合细菌及在水产养殖业中的应用 总被引：2，自引：0，他引：2
论述了光合细菌的营养成份和在水产养殖中改善水质、作为饵料、防治病害的机理、作用，指出光合细菌技术的研究、应用预示着我国水产养殖业微生态时代的到来。 相似文献
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Photosynthetic suspended-growth systems in aquaculture 总被引：3，自引：0，他引：3
Standardized evaluation and rating of biofilters for aquaculture should be assessed in the context of the economic efficiency of ecological services (waste assimilation, nutrient recycling, and internal food production) provided by earthen ponds, and the availability and cost of land, water, and electrical energy resources required to support particular classes of production systems. In photosynthetic suspended-growth systems, water quality control is achieved by a combination of natural and mechanical processes. Natural processes include photosynthesis of oxygen, algal nutrient uptake, coupled nitrification–denitrification, and organic matter oxidation; mechanical processes include aeration and water circulation. Ammonia is controlled by a combination of phytoplankton uptake, nitrification, and immobilization by bacteria. Unlike biofilters for recirculating aquaculture systems, unit processes are combined and are an integral part of the culture unit. The important design and operational considerations for photosynthetic suspended-growth systems include temperature effects, aeration and mixing, quantity and quality of loaded organic matter, and fish water quality tolerance limits. The principle advantages of photosynthetic suspended-growth systems are lower capital costs relative to other recirculating aquaculture systems and increased control over stock management relative to conventional static ponds. The main disadvantage is the relatively low degree of control over water quality and phytoplankton density, metabolism, and community composition relative to other recirculating aquaculture systems. Examples of photosynthetic suspended-growth systems include semi-intensive ponds, intensively aerated outdoor lined ponds, combined intensive–extensive ponds, partitioned aquaculture systems, greenwater tanks, greenwater tanks with solids removal, and greenwater recirculating aquaculture systems. 相似文献