共查询到19条相似文献，搜索用时 156 毫秒
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调查了苏鲁两省芦荡养鱼的部分单位。采用科学的管理,灌水和施肥措施,在芦荡内养鱼,芦苇和鱼都获丰收。一、年年获得丰收。由于在芦苇荡内养鱼能充分利用土地、光、热资源、鱼、芦年年获得丰收。二、芦苇荡内养鱼增产原因。 1.有水的芦苇荡是鱼栖息的好场所。 2.芦苇叶是鱼的好饲料。 3.鱼类是芦苇的好肥料。 4.通过挖养鱼沟改善了芦苇荡内的光照、温度和通风条件。三、芦苇荡内养鱼的技术。 1.挖集鱼沟。 2.选择鱼种。选草鱼、鳊、鲤、鲫、鲻、鲢等。 4.科学挖水。春天湿、夏天浅、秋天满、冬天干。 相似文献
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金钱鱼肾细胞系的建立及生长特性研究 总被引：1，自引：0，他引：1
金钱鱼(Scatophagus argus)是一种重要的广盐性海水养殖鱼类,可直接在海水、淡水、咸淡水等不同环境中正常生长。为研究金钱鱼独特的渗透调节机制,本文研究了金钱鱼肾细胞的原代和传代条件及其生长特性,结果表明:原代肾细胞在含有20%胎牛血清(FBS)的L-15培养基里贴壁和生长较好,添加10ng/mL的碱性成纤维细胞因子(basic fibroblast growth factor)bFGF能明显促进细胞增殖,传代细胞采用含有10%胎牛血清的L-15培养基,细胞生长迅速,3—4d即可传代。金钱鱼肾细胞为成纤维样细胞,命名为SK细胞,目前已传至22代。扩增第11代SK细胞的细胞色素氧化酶I(COI)基因,比对结果证明此细胞系来源于金钱鱼。采用CCK-8法检测第12代细胞在低渗(95,137,200mmol/kg),等渗(330mmol/kg)和高渗(430,550mmol/kg)中的增殖情况,结果发现肾细胞在137—430mm/kg的渗透压范围内均可增殖,说明金钱鱼肾细胞对渗透压的耐受性较强。本试验首次建立了金钱鱼肾细胞系,并初步证明了肾细胞对盐度有较强的耐受性,为今后渗透压调节的深入研究奠定了基础。 相似文献
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坛紫菜与条斑紫菜轮栽试验 总被引：6，自引：0，他引：6
于1987—1989年利用人工培苗和潮间带栽培方法进行了坛紫菜和条斑紫菜轮栽试验。结果表明,用加大育苗室的采光面积、保温和缩短光照时间促熟措施,可使坛紫菜丝状体在8月初开始大量放散壳孢子,8—9月中旬采壳孢子苗,采苗后约35天开始采收紫菜,至12月初结束。9月中旬采苗的,亩产干品83.3kg。条斑紫菜丝状体按常规法育苗,于10月中旬采壳孢子苗,先在海上密挂育苗,至11月底取下坛紫菜网,将条斑网分挂到坛紫菜架上,进行了两种紫菜的轮换栽培,直至翌年5月初结束,亩产干品120.1kg。两种紫菜总产量达203.4kg,比单作增产近一倍。 相似文献
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采用Cornell方法研究了初始重为(2.0±0.1)g的重口裂腹鱼幼鱼日粮中常量营养物质的适宜需求量。日粮中蛋白质、脂肪和碳水化合物梯度变化范围分别为33%—51%、3%—18%和24%—33%,试验周期为60d。试验结果表明,除日粮蛋白质33%组鱼成活率明显下降外(P<0.05),其它试验日粮中3种常量营养物质含量对重口裂腹鱼幼鱼成活率没有显著影响(P>0.05)。当日粮蛋白质水平≤45%时,其特定生长率随着日粮蛋白质水平上升而明显增加;当日粮蛋白质水平在33%—36%时,重口裂腹鱼的特定生长率显著降低(P<0.05)。除12%日粮脂肪组试验鱼外,9%日粮脂肪组试验鱼的特定生长率显著性高于其它脂肪水平日粮组(P<0.05),但当日粮中脂肪含量≥15%后,重口裂腹鱼鱼体脂肪含量显著上升(P<0.05),肝细胞脂肪变性明显。日粮中不同的碳水化合物水平对重口裂腹鱼特定生长率没有显著影响(P>0.05),但当日粮中碳水化合物为33%时,鱼体糖原含量显著增加(P<0.05)。试验表明,重口裂腹鱼幼鱼日粮蛋白质、脂肪和碳水化合物3种常量营养物质的适宜需求量分别为45%、9%和≤30%。日粮总能为19.0MJ/kg,蛋白质能量比(P/E)为23mg/J。 相似文献
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采用传统养殖试验方法研究了日粮中添加叶黄素与角黄素对瓦氏黄颡鱼(Pelteobagrus vachelli Richardson)体色的影响。实验设计了11组等蛋白质(42.6%)、等能量(18.5MJ/kg)的实用试验日粮,在试验日粮中分别添加0、25、50、100、200mg/kg叶黄素和25、50、100mg/kg叶黄素与25、50mg/kg角黄素,对照组为野生瓦氏黄颡鱼。结果表明,实验结束时(60d),试验3、8、9日粮组(添加50mg/kg叶黄素、50mg/kg叶黄素+25mg/kg角黄素、50mg/kg叶黄素+25mg/kg角黄素)鱼体体色与对照组鱼(野生瓦氏黄颡鱼)体色相似,试验3、8、9组鱼皮肤中叶黄素含量与对照组鱼差异不显著(P0.05)。本实验认为,在日粮中添加叶黄素对瓦氏黄颡鱼的着色效果明显较角黄素好,是养殖瓦氏黄颡鱼饲料的适宜添加色素。在瓦氏黄颡鱼的饲料中叶黄素的建议添加量为50mg/kg。 相似文献
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对新引进的红拟石首鱼Sciaenopsocellatus进行咸水池养生长特性与饲养技术研究 ,结果表明 ,其生长旺盛期在 2龄。应用vonBertalanffy方程求得人工饲养条件下其体长、体重生长方程分别为Lt =656.2 72 2 [1 -e- 0 .5998(t 0 .0 82 3) ]和Wt =41 93.90 2 1 [1 -e- 0 .5998(t 0 .0 82 3) ]2 883 4。体重生长拐点于 1 7龄处。面积为 6 5hm2 池塘的单养 ,经 365d ,最高单产 1 860 0kg·hm- 2 ,净产 1 1 0 2 5kg·hm- 2 ;面积为 1 0 1 7hm2 池塘以拟石首鱼为主养对象的混养 ,经 540— 560d ,最高单产 1 8640kg·hm- 2 ,净产 1 82 2 5kg·hm- 2 。投入产出比 1∶1 2。 相似文献
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本文系1981—1985年,在黄海对远东拟沙丁鱼的调查基础上写成的,内容包括,远东拟沙丁鱼个体绝对生殖力E为21 618—90 378粒;个体相对生殖力E/L(体长)为1279—4031粒,E/W(纯体重)为346—814粒;海州湾与青岛、乳山、石岛近海是该鱼的两个主要产卵场,产卵期为5月中旬—7月初;远东拟沙丁鱼属多次排卵类型的鱼类;体长分布范围在140—245mm,体重范围在29—162g,生殖鱼群年龄由2—6龄鱼体组成,产卵盛期雌鱼数量多于雄鱼,产卵末期雄鱼个体则多于雌鱼. 相似文献
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饲料中主要能量物质对大菱鲆幼鱼生长的影响 总被引：9，自引：0，他引：9
于1999年6－8月，采用正交设计统计方法，对主要能量物质蛋白质、脂肪和糖类对大菱Ping幼鱼生长的影响进行研究。利用L16（4^3）正交设计了16组大菱Ping幼鱼饲料，在各级饲料中，蛋白质、脂肪和糖类的含量范围分别为36％－45％、8％－20％和0％－6％，共进行了60d的喂养实验，并对饲料及鱼体成分进行分析测定。结果表明，各主要能量物质对鱼体增重和配合饲料转化率的影响顺序为蛋白质＞糖类＞脂肪，且蛋白质的变化对增重率的影响极显著，对饲料转化率的影响显著。 相似文献
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随着鲍的人工育苗数量的不断增多,以及幼鲍从室内培养池移入海区的养殖阶段,直到成为种苗的规格(壳长1—1.5厘米),其饵料仍然是养殖成败的关键之一。福建南部海区杂色鲍(Haliotis diversicolor Reeve)的种苗培育阶段,正值夏季水温升高,采集天然海藻比较困难,鲍的饵料发生短缺;而且为了进一步弥补和提高鲍的饵料中所含蛋白质等营养成分,以提高幼鲍和种苗鲍存活率,加快生长速度,除积极开发利用天然海藻资源外,必须广开饵料新途径,因而研制种苗鲍用试验配合饵料,适当增加能促 相似文献
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Fernandez-Jover D Jimenez JA Sanchez-Jerez P Bayle-Sempere J Casalduero FG Lopez FJ Dempster T 《Marine environmental research》2007,63(1):1-18
Net-cage fish farms attract a great number of wild fishes, altering their behaviour and possibly their physiology. Wild Mediterranean horse mackerel (Trachurus mediterraneus), sampled from populations aggregated around two Mediterranean fish farms and from two natural control populations, were analyzed for differences in body condition, stomach content and fatty acid composition. Pellets used to feed caged fish in both farms were also analyzed to identify their relationship with the fatty acid composition of tissue of wild fish. T. mediterraneus aggregated around the farms throughout the year although large seasonal changes in abundance and biomass occurred. Wild fish aggregated at farms mainly ate food pellets while control fish fed principally on juvenile fish and cephalopods. Wild fish that fed around the cages had a significantly higher body fat content than the control fish (7.30+/-1.8% and 2.36+/-0.7%, respectively). The fatty acid composition also differed between farm-associated and control fish, principally because of the significantly increased levels of linoleic (C18:2omega6) and oleic (C18:1omega9) acids and decreased docosahexaenoic acid (C22:6omega3) in farm-associated fish. The increased condition of wild fish associated with farms could increase the spawning ability of coastal fish populations, if wild fish are protected from fishing while they are present at farms. The fatty acids compositions could also serve as biomarkers to infer the influence of a fish farm on the local fish community, helping to better describe the environmental impact of fish farming. 相似文献
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鮸状黄姑鱼早期发育阶段的摄食与生长特性 总被引：9，自引：0，他引：9
1997年4－5月,在集美大学水产学院海水育苗试验场,采用生态学方法对人工培育的状黄姑鱼仔、稚、幼鱼的援食和生长特性进行分析。结果表明,在人工培育条件下,仔、稚、幼鱼的摄食率达97.9％,摄食量占体重的1．4％－23．4％,日摄食量占体重的36．47％－6519％;摄食具明显的昼夜节律,黄昏和早晨为摄食高峰;对较大个体的饵料生物有明显的选择性;饵料密度对摄食量有一定影响。摄食量与体重的关系式为y=0.1327x＋0．5613,全长与日龄的关系式为LT=2.5799eg.g516D,体重与日龄的回归方程为W=0．0537e‘.1786D,全长与体重的回归方程为W＝0．0042L。 相似文献
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《Marine Policy》2017
Comments are provided on several points in the 2016 State of the World Fisheries and Aquaculture produced by the Food and Agriculture Organization of the United Nations (FAO). It is shown that data assembled by FAO from submissions by countries suggest a “stable” trend mainly because the declining catches of a number of countries with reliable statistics is compensated for by unreliable statistics from countries where reporting increasing catches may be politically expedient, e.g., China, Myanmar. Also, concerns are raised as to why FAO chose to ignore the well-documented data ‘reconstruction’ process, which fills the gaps that exist in data reported by countries to FAO. It is being ignored despite its importance for governance and resource conservation being well known. This process and its findings could be used by FAO to encourage countries to improve their data reporting, including retroactive corrections. This is important in view of successive analyses of the status of fisheries resources undertaken by FAO (published in current and past SOFIAs) and also in modified form by the Sea Around Us. This suggests a degradation of marine fisheries, and, if trends continue, a crisis by mid-century. Finally, comments are presented on the proposition that aquaculture will overtake wild capture fisheries in terms of food production, notably because current aquaculture requires huge quantities of wild-caught fish as feed. Indeed, this emphasis on aquaculture-as-substitute for fisheries raises issues of food security and malnutrition in developing countries, from which much of the fish used as feed originates. 相似文献
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作者根据大量试验和调查数据的分析,提出烟单14号夏玉米在高产条件下,亩穗数、穗粒数、千粒重三因素的最佳取值范围。 亩穗数:3569～4980 穗/亩; 穗粒数:423～526 粒/穗; 千粒重:259～278 克/1000粒。 相似文献
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Sung-Yong Oh Min-Suk Kim Joon Yeong Kwon B. A. Venmathi Maran 《Ocean Science Journal》2013,48(3):263-268
The feed intake, growth and body composition of juvenile blackhead seabream Acanthopagrus schlegelii schlegelii (Sparidae) (5.6 g fish?1) were investigated for 16 weeks in sea cages under seven repetitive feeding cycles: every day feeding (control), 6-day feeding and 1-day fasting (F6.1), 5-day feeding and 1-day fasting (F5.1), 4-day feeding and 1-day fasting (F4.1), 3-day feeding and 1-day fasting (F3.1), 2-day feeding and 1-day fasting (F2.1), and 1-day feeding and 1-day fasting (F1.1). The survival of the fish during the experimental period was not different among the feeding cycles. The greatest weight gain of fish was observed in the control, but not significantly different from that of the F6.1 and F5.1 groups (p > 0.05). Total feed intake and daily feed intake decreased with the increase of fasting frequency, however, actual feed intake, feed efficiency and protein efficiency ratio increased with the increase of the fasting frequency. Proximate composition of the whole body of fish was not affected by different feeding cycles. These results suggest that juvenile blackhead seabreams subjected to repetitive feeding cycles of 6- or 5-days feeding and 1 day fasting for 16 weeks could achieve compensatory growth, and that such mild feeding deprivation could save significant amounts of feed without causing any profit reduction that might result from a decrease in fish size or quality. 相似文献
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在实验室条件下,通过特定感官消除或抑制方法和特定感官刺激方法对半滑舌鳎摄食行为反应机制进行了研究。结果表明,半滑舌鳎主要依靠侧线摄食,其侧线主要对猎物的低频振动起反应;嗅觉起辅助作用,头部各边缘部位和躯干中上部各鳍具有部分作用;视觉在捕食中的作用不大,味觉在食物吞咽过程中起很大作用。由于半滑舌鳎主要利用侧线捕食猎物,嗅觉起辅助作用,在人工养殖条件下,应根据其摄食生理特点,设计投喂饲料,制定投喂策略。 相似文献