Harmful Ciliates and Dominant Genus in Culture Ponds of Young Abalone

By using the methods of qualitative and quantitative analysis, the species composition and dominant genus of harmful ciliates in young abalone culture ponds are studied. Totally 68 ,species of ciliates, belonging to 3 classes16 orders and 46 genus, are found. The dominant ciliate species are Aspidisca leptaspis, Vorticella sp. and Euplotes rariseta. During the young abalone cultivation, the numbers of young abalones increase first, and then show a trend of decreasing. The relationship between the density and composition of ciliates and the density of algae in the young abalone culture ponds is also discussed.

PCR-DGGE Analysis of Bacterial Communities Structure in Babylonia areolata Culture Systems of The Subtidal Zone and The Pond Mulched Plastic Film and Sand in Bottom

To know the bacterial communities structure in Babylonia areolata culture systems and to research and optimize the management pattem of Babylonia areola-ta culture systems of the pond mulched plastic film and sand in bottom, the bacte- rial communities in Babylonia areolata culture systems of the sub-tidal zone and the pond mulched plastic film and sand in bottom were analyzed at molecular level by adopting the denaturing gradient gel electrophoresis （DGGE）. The results indicated that the dominant bacterial communities in Babylonia areolata culture systems of the sub-tidal zone and the pond mulched plastic film and sand in bottom, which were built on the basis of the seawater in East-island of Zhanjiang, included Proteobac- teda Chloroflexi, Cyanobacteria and Actinobacteria. The dominant bacterial groups in the above pond culture system were Garnmaproteobacteria, Alphaproteobacteria, Deltaprotecbacteda, Epsilonproteobacteda, Anaerolineae, Cyanobacteria and Acti- nobacteda. The dominant bacterial communities in the subtidal zone culture system were Gammaprotecbacteda, Alphaproteobacteria, Deltaproteobacteria, Anaerolineae and Cyanobacteda, and there were less Epsilonproteobacteria and Actinobacteria in the culture system. The higher diversity was detected in the above two culture sys- tems. The results of unweighted pair group method with arithmetic average （UPG- MA） showed that the bacterial communities of the sediment samples S1 and S2 in the above two culture systems were a cluster, the similarity of bacterial communities was 54.5%. The bacterial communities of seawater samples S3 and S4 in the above culture systems were in clusters, and the similarity of the bacterial communi- ties was 84.0%. The results showed that the microorganism ecological level in the Babylonia areolata culture systems of the pond mulched plastic film and sand in bottom could be similar to the sub-tidal zone culture systems through changing the pond seawater and monitoring the microbial population.

Effects of Rice-Fish Co-culture on Oxygen Consumption in Intensive Aquaculture Pond

Rice-fish co-culture has gained increasing attention to remediate the negative environmental impacts induced by intensive aquaculture. However, the effect of rice-fish co-culture on oxygen depletion has rarely been investigated. We constructed a rice-fish co-culture system in yellow catfish(Pelteobagrus fulvidraco) and freshwater shrimp(Macrobrachium nipponense) ponds using a new high-stalk rice variety, and conducted a field experiment to investigate the effect of rice-fish co-culture on water parameters and oxygen consumption. The results showed that rice-fish co-culture reduced the nutrients(total nitrogen, ammonia-N, total phosphorous and potassium) and the dissolved oxygen content in fish and shrimp ponds. However, they showed similar seasonal change of dissolved oxygen in the water of fish and shrimp ponds. Rice-fish co-culture reduced the total amount of oxygen consumption and optimized the oxygen consumption structure in pond. The respiration rates in water and sediment were significantly reduced by 66.1% and 31.7% in the catfish pond, and 64.4% and 38.7% in the shrimp pond, respectively, by additional rice cultivation. Rice-fish co-culture decreased the proportions of respiration in sediment and water, and increased the proportion of fish respiration. These results suggest that rice-fish co-culture is an efficient way to reduce hypoxia in intensive culture pond.

Impacts of Climate Change on Economic Performance of Tilapia Pond Operations in Minalin, Pampanga: A Case of Intensive Large-Scale Pond Culture

Pampanga is the top tilapia-producing province in Philippines. One of its municipalities, Minalin, is considered as one of its major centers of production. This study aims to determine the impacts of climate change hazards on the economic performance of tilapia-intensive pond culture in Minalin, Pampanga considering the threats to the industry, livelihoods, and food security. Results revealed that the economic performance of tilapia pond operations using semi-intensive large-scale culture was affected by climate change, as reflected in the reduction of yield among tilapia pond operators. This makes intensive tilapia pond farming in Minalin still a viable venture but will now require more than a year to pay for investment (variable and fixed) costs if under climate change risks. The study recommends strengthening capacity building related to climate-smart tilapia farming technologies for pond operators and to implement appropriate technologies to address climate change risks.

Filamentous Green Algae Reduce Walleye Fingerling Production in Earthen-Substrate Ponds

Reduced walleye (Sander vitreus) fingerling production possibly related to nuisance filamentous green algae and overly stable water chemistry patterns is a concern in earthen-substrate ponds at Blue Dog State Fish Hatchery, South Dakota, USA. We describe the success of alfalfa (Medicago sativa) meal (AFM, n = 2), alfalfa meal plus soybean (Glycine max) meal (AFM + SBM, n = 1), and alfalfa meal plus liquid 28N:0P:0K (AFM + 28:0:0, n = 1) at achieving walleye production objectives (>104,000 walleye and 32 kilograms/hectare) as well as the occurrence of filamentous green algae and the associated patterns of ammonia-nitrogen, pH, and dissolved oxygen in earthen-substrate ponds. Walleye production objectives were only achieved when filamentous green algae were absent preceding harvest, which occurred in one pond that received AFM and in the pond that received AFM + 28:0:0. The presence of filamentous green algae preceding harvest was associated with higher dissolved oxygen and pH, whereas declines in these variables occurred when filamentous green algae were absent. Organic fertilizer alone exhibited low ammonia-nitrogen (<0.1 mg/L) despite the substitution of higher protein content soybean meal, but supplementation with 28:0:0 increased ammonia-nitrogen to 0.23 mg/L. These findings highlight the reduction in walleye fingerling production that occurred in the presence of filamentous green algae and the unpredictability of results when two earthen-substrate ponds are treated exactly the same with alfalfa meal. Achievement of walleye production objectives, lack of nuisance filamentous green algae, and promotion of favorable patterns in water chemistry warrant future experimentation with alfalfa meal supplemented with 28:0:0 in earthen-substrate ponds at this hatchery.

Factors Associated with Increased Walleye Production in Lined Compared to Earthen-Substrate Ponds

Walleye (Sander vitreus) fingerling production can be enhanced when the pond substrate is altered from earthen soils to an exposed liner;however, few differences in water chemistry, prey densities, and food habits have been identified that could potentially explain this production difference. Lack of an explanation led to further comparison of walleye fingerling culture between substrate types during 2016. Two ponds of each type were stocked with 1- to 3-day-old walleye fry, but lined ponds received an additional 104,166 fry/ha and were stocked 1 or 2 days later than earthen ponds (May 10). Walleyes in lined ponds achieved a growth advantage on May 31 (+2.5 mm) and on June 6 (+3.3 mm), but lengths were not significantly different at harvest (June 15). Lined ponds increased walleye yield and number 1.8-fold while not reducing individual fish size at harvest compared to earthen ponds. Walleye food habits were generally similar between pond types with a greater number of zooplankton being consumed through June 6 followed by an increase in larval chironomid consumption at harvest (June 15). After May 30, lined ponds exhibited lower dissolved oxygen and higher ammonia-nitrogen concentrations even though earthen ponds received additional (157 kg/ha) alfalfa (Medicago sativa) meal fertilizer. Also, at this time pH declined abruptly and remained below 8.2 in lined ponds. Moreover, the enhanced production in lined ponds coincided with walleyes that exhibited an increased pelagic (δ13C) signature during the culture period (2‰ to 3.3‰ more negative). Efforts to improve production in earthen-substrate ponds should focus on increasing the pelagic signature of the food web through fertilization strategies which increase ammonia-nitrogen (≈0.3 mg/L) and decrease dissolved oxygen (≈6.5 mg/L) while maintaining a pH between 8.0 and 8.2 during the second half of the rearing interval.

Evaluating a Three-Fold Continuum of Fry Stocking Density for Rearing Walleye in Lined Ponds

Fry stocking density can affect harvest metrics for fingerling walleye (Stizostedion vitreum) reared in drainable ponds, but few studies have examined these relationships with the use of elevated walleye fry stocking densities in lined ponds. Correlation and regression analyses were used to assess how a three-fold change in walleye fry stocking density (234,375 to 703,125 per hectare) relates to harvest metrics and length of the culture period, as well as the tradeoff experienced between walleye size (grams) and harvest density in 0.32-hectare lined ponds over a nine-year period at Blue Dog State Fish Hatchery, South Dakota. As fry stocking density increased, so did harvest metrics for both number (r = 0.85, P < 0.01) and yield (r = 0.81, P < 0.01). Length of the culture period varied between 24 and 35 days and was negatively related to stocking density (r = -0.66, P The linear relationship between harvest density and yield was highly correlated (r = 0.95, P < 0.01) with highest values measuring 617,625 walleye and 173 kilograms per hectare. Harvest density explained 61% of the variation in walleye size (P 0.01) and exhibited a decreasing curvilinear relationship such that continued increases in harvest density resulted in smaller reductions in fish size. Increasing fry stocking density from 234,375 to 703,125 per hectare in lined ponds coincided with increased rearing efficiencies for number and yield, as well as a reduced culture period. Minimal reduction in walleye size occurred once harvest density exceeded 300,000 per hectare.

Availability and Timing of Fathead Minnow Supplementation Influence Largemouth Bass Survival and Production in Rearing Ponds

Adjustments to rearing practices should be justified with increases in production, stocking success, or angler satisfaction. Largemouth bass (Micropterus salmoides) production was assessed between hatchery ponds where fish were restricted to an invertebrate diet or received supplemental fathead minnow (Pimephales promelas) forage during 2015. At harvest, age-0 bass yield was 4.5 times greater and average fish length was 38 mm longer, in the pond that received fathead minnow. In 2016, a second study evaluated the timing of minnow supplementation that included earlier stockings of small fathead minnow (<30 mm) compared to delayed supplementation with larger (>30 mm) minnows. With earlier supplementation, bass yield was 2.3 times greater and fish averaged 14 mm longer at harvest. Bass survival was approximately 38% higher during 2015 when supplementation occurred and 25% higher during 2016 when minnow supplementation began earlier. Our findings show invertebrate forage was probably limiting bass production in hatchery ponds and supplementing with appropriately-sized fathead minnows increased age-0, largemouth bass production.

Survey of Climate-Related Risks to Tilapia Pond Farms in Northern Thailand

Climate is an important factor for aquaculture production. This study aimed to understand how farmers that culture tilapia in earthen ponds perceive and respond to climate impacts. Important climate-related risks identified include extreme temperatures (hot and cold), excessive rainfall, prolonged cloud cover, flood and drought. Site visits and data collection using questionnaires were conducted to identify important factors influencing farm profits, losses, decision to increase or decrease ponds. Special attention was given to knowledge about fish markets and weather and the impacts of weather and climate on fish growth, disease outbreaks and water quality in ponds. Altogether 585 fish farms in four provinces in northern part of Thailand selected to cover a range of elevations above sea level and thus climate were surveyed (Nakornsawan< 100 m, Lampang 100-300 m, Phayao 300-500 m and Chiang Mai > 500 m). Fish farms at different elevations reported different climate and weather-related impacts. In the area where elevation above sea level is < 100 m, farmers were affected more by floods and extreme hot weather which caused fish deaths and stress that reduced feeding and growth rates. Conversely, fish farmers in the area where elevation above sea level is >500 were impacted mainly by drought and cold weather. These conditions also caused disease outbreaks and reduced feeding rates. Farmers responded by reducing the amount of feed supplied and considering non-fish pond or non-farm supplementary occupations as an adaptation strategy. Among non-climate related factors high prices of feed were most commonly identified as a key issue by farmers. The differences among sites at higher and lower elevation provided insights into the kind of changes in risks farmers may face as climate changes that could be helpful in developing adaptation strategies for individual farmers and the sector as a whole.

Pond Substrate Type Affects Yellow Perch Fingerling Size at Harvest

Fish size and harvest density generally exhibit a negative relationship in pond culture, but the influence that pond substrate type can have on this relationship is not well understood. To evaluate the influence of pond substrate type on yellow perch (Perca flavescens), harvest density (number/hectare) was linearly regressed against individual fingerling size (grams) for lined (n = 48) and earthen (n = 40) substrate ponds that were treated similarly in terms of organic fertilizer use and the number of days in the pond over 12 culture seasons at Blue Dog Lake State Hatchery, South Dakota, USA. Harvest density explained 45 and 39% of the variation in yellow perch size in lined and earthen-substrate ponds (all P < 0.01). Comparison of regression lines indicated that fingerling size decreased as harvest density increased at a similar rate in both pond types (slope comparison, P = 0.62);however, fingerling size was significantly larger in lined ponds regardless of density that varied from near 0 to 700,000 per hectare (y-intercept comparison, P < 0.01). At the same harvest density, lined ponds will tend to produce larger yellow perch fingerlings compared to earthen ponds when similar organic fertilizers are used.

淡水养殖池塘水质评价及与底质相关性分析

在哈尔滨地区面积6 600 m^(2)、平均水深1.2 m、多年未清淤的泥沙底质典型淡水精养池溏中混养鲤(Cyprinus carpio)、鲇(Silurus asotus)、草鱼(Ctenopharyngodon idella)和鲢(Hypophthalmichthys molitrix),春季(4—5月)、夏季(6—8月)和秋季(9月)不同时间采集池塘水体和表层底泥样品,监测养殖周期内水质总氮(TN)、总磷(TP)、氨氮(NH_(4)^(+)-N)、亚硝酸盐氮(NO_(2)^(-)-N)、硝酸盐氮(NO_(3)^(-)-N)和总有机碳(TOC)含量及高锰酸盐指数(COD_(Mn))、p H的季节性变化,利用单项污染指数法、综合污染指数法评价水体污染程度,利用主成分分析法解析水质污染的主要驱动因子,并结合底质指标绘制网络关系图。结果表明:池塘水质整体处于严重污染水平,春季优于夏季和秋季。参与评价时池塘水质为Ⅳ类、Ⅴ类和劣Ⅴ类,水质超标数随着养殖时间延长而增加,TN在全养殖周期内均超出警戒水平;TN、TP、NH_(4)^(+)-N和COD_(Mn)是池塘水体的主要污染物。因子分析结果表明,池塘水质主要受鱼类的生长代谢、溶解氧和投饵的影响,污染物以N、P营养盐为主。水体TP、TN、NH_(4)^(+)-N和底泥NO_(2)^(-)-N呈极显著正相关关系(P<0.01),与底泥TOC呈显著正相关关系(P<0.05)。池塘水体和底泥中的有机物污染具有共现性,水体TOC和底泥TOC呈极显著正相关关系(P<0.01)。

In the Pond中的中国英语特点探析

在外语型国家,英语表现出与母语国家和二语型国家使用的英语不一样的特点。文章借用印度英语研究的集大成者Kachru的相关原理和理论探析了中国英语新文学作品(以哈金的处女作In the Pond为例)中的中国英语表现出来的特征,并将其与同是"非母语变体"的印度英语作对比,发现二者的相似处和不同点,简要分析了造成这种现象的原因。

北方地区池塘西杂鲟和匙吻鲟混养试验

为合理利用养殖水体,提高鲟鱼池塘养殖综合效益,2023年在吉林省辽源市东丰县那丹伯镇开展西杂鲟和匙吻鲟混养试验。通过在5亩池塘放养栖息于底层的西杂鲟(725.0 g/尾)和中上层的匙吻鲟(468.8 g/尾)苗种,经120 d驯化养殖,西杂鲟成鱼规格2.1 kg/尾,匙吻鲟成鱼规格1.75 kg/尾,池塘单产640 kg/亩,单位面积利润3774.4元/亩。

长江流域2种水产养殖模式的生命周期环境影响评价

本研究以长江流域内的池塘养殖和稻渔综合种养2种水产养殖模式为对象,应用生命周期评价方法,分析2种养殖模式对能源消耗(EU)、全球变暖潜势(GWP)、酸化潜势(AP)、富营养化潜势(EP)以及水资源消耗(WU)5种环境指标的影响,并探究2种主要输入因子(饲料和电力供应)和养殖过程对各环境指标的影响,从而评价2种养殖模式对环境影响的差异。生命周期评价结果标准化处理和加权评估显示,稻渔综合种养模式的WU、EP、GWP、AP和EU值分别为11.650、0.770、0.141、0.096和0.003,总环境影响指数(TEII)为12.660;池塘养殖模式的WU、EP、GWP、AP和EU值分别为31.453、1.187、0.210、0.174和0.007,TEII为33.031。与稻渔综合种养模式相比,池塘养殖模式的各项环境指标均较高。对环境影响的贡献率分析表明,饲料供应对EU、GWP和AP的贡献率最高,EP主要受饲料供应和养殖过程的共同影响,而WU主要集中在养殖过程中,电力供应主要影响EU、GWP和AP。生命周期评价的结果表明,与池塘养殖模式相比,稻渔综合种养模式显示出更友好的环境效益,在我国长江流域具有较大的发展空间。2种养殖模式的贡献率分析表明,改进饲料生产工艺、建立精准投喂技术、应用先进的尾水处理技术和适当提高养殖密度是我国长江流域水产养殖环境友好生产的关键。

高温季节池塘种植水葫芦对河蟹生长及水质调控的影响

持续高温往往会造成蟹塘内的伊乐藻等水草衰亡,不利于河蟹的生长发育。为探明高温季节池塘种植水葫芦对河蟹生长及水质调控的影响,对养殖“诺亚1号”河蟹的池塘设置3组不同的水草种植模式,即无草塘补种水葫芦组(EI)、有草塘无处理组(EL)和有草塘补种水葫芦组(EIL)进行了为期3个月的试验,比较各组试验塘的水质、水草长势情况以及河蟹的体质量、产量、残蟹率、回捕率等。试验结果显示:EIL组的伊乐藻保存较好,且在高温季节池塘水温低于其他两组;EI组河蟹的体质量、产量、回捕率显著低于EIL组(P<0.05),残蟹率显著高于EIL组(P<0.05),但EI组各项指标与EL组相比没有显著差异(P>0.05)。水质调控方面,EIL组NH_(4)^(+)-N、NO_(2)^(-)-N、TN、TP等水质指标均优于其他两组;8月份EL组的NH_(4)^(+)-N质量浓度显著低于EI组(P<0.05),9月份以后,EL组的NO_(2)^(-)-N、TN质量浓度均显著高于EI组(P<0.05)。结果表明,高温季节在无草蟹塘适当补种水葫芦对河蟹生长有积极作用,沉水性+浮水性水生植物的组合型水草种植模式可有效提高河蟹产量,改善池塘水质。

海水垂向入侵问题研究进展

随着全球气候变暖,风暴潮在沿海地区的频率和强度均可能增长,由此引发的海水垂向入侵可能会造成大面积的含水层淡水咸化。同时,由人类活动引起的沿海虾塘咸水养殖规模日益增长,由此引发的咸水垂向入侵可能会导致沿海地区地下水水质及生态环境的恶化。虽然已有一部分学者在海水(咸水)垂向入侵的研究中取得了成果,但由于海水(咸水)垂向入侵过程复杂,其对地下水咸化及恢复规律依然有待深入研究。文章阐述了海水垂向入侵的危害及前人的研究办法,总结了他们的研究成果并得出了海水垂向入侵的影响因子,指出了洪水和养殖活动对沿海地区含水层的威胁。得出的结果如下:研究海水垂向入侵常用的方法包括室内试验和数值模拟;海水垂向入侵主要与地形地貌、含水层性质和水文气象条件有关;虾塘养殖等人类活动可能会成为垂向咸水入侵的潜在来源。建议未来在海水垂向入侵研究中将多种现场观测实验方法结合起来。数值模拟应注重与现场观测实验数据相互验证,模型简化的方式有必要仔细考虑。虾塘养殖等人类活动可能造成的垂向咸水入侵问题应更多地受到关注。

凡纳滨对虾养殖池塘及外河道的浮游植物群落结构变化

为了解凡纳滨对虾养殖池塘浮游植物群落结构的动态变化及其与周边水体的差异、浮游植物群落结构与环境因子之间的关联,实验对上海市奉贤区某凡纳滨对虾养殖场的养殖池塘和外河道进行了采样检测,采用多元分析方法对养殖池塘及外河道的浮游植物和环境因子之间的相关性进行了研究。结果显示,池塘在整个养殖周期内共检测出了7门67属(绿藻门属数占51%),其中优势属有5门28属,硅藻门中的小环藻属为最常见优势属(F=1.0);总平均密度为1.09×10~7个/L,其中绿藻门、蓝藻门和硅藻门的平均密度占47%、30%和11%;相关性分析表明,养殖池塘浮游植物群落结构与总氮(TN)、总磷(TP)、高锰酸盐指数(COD)呈极显著正相关。外河道在整个采样周期内共检出7门56属(绿藻门属占46%),其中优势属有6门26属,隐藻属和小环藻属为主要优势属;总平均密度为1.18×10~5个/L,其中隐藻门、硅藻门和绿藻门的平均密度占46%、27%和13%;外河道的浮游植物结构主要受菌落总数和轮虫的影响。相较于外河道,池塘的浮游植物密度大且属类多,并在9—10月大量暴发微囊藻属,对对虾养殖造成了威胁,因此应密切关注总氮、总磷和有机物含量的变化。研究表明,人工干预下的对虾养殖系统与自然生态系统浮游植物群落存在结构差异。本研究结果可为对虾的绿色生态养殖提供参考。

水华对中华绒螯蟹(Eriocheir sinensis)池塘养殖系统细菌群落及潜在致病菌的影响

近年来,水华频发制约着中华绒螯蟹养殖业的发展,环境微生物群落响应水华发生与消退机制是预防与治理水华的重要组成部分。为了解析中华绒螯蟹养殖系统细菌群落对水华的响应特征,采用16S rRNA基因扩增测序技术对拟浮丝藻水华下中华绒螯蟹养殖池塘细菌群落的组成、结构和潜在病原菌的变化进行了研究。结果显示,水体中的优势细菌类群为伯克霍尔德菌科(Burkholderiaceae)和微杆菌科(Microbacteriaaceae),底泥中的优势类群为Steroidobacteraceae菌科和Burkholderiaceae等;科水平下的蓝细菌门类群和其他大部分细菌群落呈显著正相关。养殖水体中潜在病原菌的丰度与水华的生消呈现出相反的趋势,OTU365和OTU1614(均属于Candidatus Similichlamydia epinepheli)是其主要的潜在病原菌,而在底泥中潜在致病菌表现出富集的特征,以OTU1280(大肠杆菌,Escherichia coli)为主。CCA结果显示,蓝藻暴发过程中,Tem、NO3--N、NO2--N及NH4+-N驱使水体蓝藻门细菌类群的变异,NO2--N是驱动养殖水体潜在致病菌群落变异的主导因子。研究结果为防治中华绒螯蟹养殖水华发生提供了宝贵的数据支撑。

河北省海水养殖凡纳滨对虾(Litopenaeus vannamei)养殖尾水监测对比研究

以河北省黄骅地区海水工厂化和池塘养殖凡纳滨对虾尾水为研究对象,检测这两种养殖模式下不同养殖阶段所排放的养殖尾水中化学需氧量(COD)、无机氮(DIN)及活性磷酸盐(DIP)等指标的变化,利用单因子污染指数(P i)和内梅罗综合指数(P)对养殖尾水状况进行了评价。结果表明,尾水的主要污染因子为DIN与DIP;主要污染物浓度均值工厂化养殖模式高于池塘养殖模式,且工厂化养殖尾水主要污染物均超过《河北省海水养殖尾水污染物排放标准》一级排放限值;养殖尾水主要污染物浓度均随养殖时间的延长而增加;两种模式下养殖尾水的内梅罗综合指数P值均处于严重污染状等级。

池塘养殖密度对兴凯湖翘嘴鲌幼鱼生长的影响

为研究养殖密度对兴凯湖翘嘴鲌幼鱼生长性能的影响,探索兴凯湖翘嘴鲌池塘养殖密度阈值,设置养殖密度分别为15万尾/hm^(2)(D1)、30万尾/hm^(2)(D2)、60万尾/hm^(2)(D3)、90万尾/hm^(2)(D4)、150万尾/hm^(2)(D5)共5个试验组,进行了为期180 d的兴凯湖翘嘴鲌幼鱼池塘培育试验。试验结果显示:幼鱼的增重率随着放养密度的增加呈现明显的下降趋势,其中放养密度最低的D1组幼鱼的增重率最高,达63.74%,但与D2组(60.57%)没有显著差异,D1、D2组幼鱼的增重率显著高于其他密度组(P<0.05);幼鱼的体长增长率也随着养殖密度的增加呈现显著下降的趋势,D1组体长增长率最高,为3.16%,D5组最低,为0.56%;养殖试验结束时,5个试验组鱼的肥满度无明显差异。结果表明,池塘养殖条件下兴凯湖翘嘴鲌幼鱼的适宜培育密度为30万~60万尾/hm^(2)。