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ALGAE AND DETRITAL MATTER AS FOOD FOR JUVENILE PURPLE-HINGE ROCK SCALLOPS,Hinnites multirugosus GALE
C. F. Phleger S. C. Cary D. L. Leighton 《Journal of the World Aquaculture Society》1981,12(2):180-185
Feeding experiments using commonly-cultured algae were conducted with purple-hinge rock scallops, Hinnites multirugosus Gale, to suggest the application of these algae to hatchery culture of scallops. The uptake of finely divided particulate matter was also studied to ascertain the possible importance of detritus as a supplemental food for the rock scallop. A 1:1:1 mixture by culture volume of Tahitian Isochrysis, Tetraselmis suecica, and Dunaliella salina appeared to be superior as a diet for juvenile rock scallops. Significant growth also occurred in juvenile rock scallops fed T-Isochrysis, T. suecica, Isochrysis galbana, and Rhodomonas sp. Gymnodinium splendens, Monochrysis lutheri, and Dunaliella salina fed alone were poor foods for juvenile rock scallops. Finely divided particulate matter as radiolabeled abalone fecal matter was utilized as food. Significant radioactivity appeared in DNA, RNA, lipid, protein, carbohydrate, and free-reducing substances after one week providing evidence that particulate matter was incorporated into juvenile rock scallop metabolic pathways. 相似文献
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菜州湾黄河口区幼鱼可分为浮游动物食性、底栖动物食性、混合食性和游泳动物食性4个类群。主要饵料生物为浮游动物、长尾类和仔幼鱼。浮游动物食性和游泳动物食性类群饵料重叠最严重,重叠系数在0.09以上。底栖动物食性类产有一定的偏离,重叠系数在0.45~0.72之间。小黄鱼、虎鱼类等幼鱼由于都以摄食长尾类和仔幼鲑为主,重叠系数在0.8以上。幼鱼的营养级在2.1~3.2之间平均比海成鱼营养级低0.43。这是由 相似文献
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温度对黄盖鲽仔鱼生长、发育、摄食及PNR的影响↑(*) 总被引:24,自引:0,他引:24
对黄盖鲽(Limandayokohamae)仔鱼生长、发育、摄食及PNR的研究结果表明:在10.5-19℃范围内,温度对其卵黄囊期仔鱼的生长基本上无影响,不适当地升高温度对卵黄耗尽至变态期之间仔鱼的生长不利,较高的温度可促进仔鱼的发育使之提早进入变态期,10日龄内过高的升温可明显增加仔鱼的死亡率与畸形个体数。黄盖鲽仔鱼在20日龄以内的摄食无明显节律性;温度对近变态期以前仔鱼在10:00-14:00之间的摄食强度基本上无影响,仔鱼的摄食强度随日龄的增加而逐步增加;适宜的轮虫投喂密度在10日龄内为10个/ml,15-20日龄为20个/ml。黄盖鲽仔鱼的混合营养期很短,约在24小时以内;仔鱼开口摄食期为孵化后4-6日;升温可使饥饿仔鱼提早进入PNR。 相似文献
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光照对黄盖鲽仔鱼生长_发育及摄食的影响 总被引:12,自引:1,他引:12
光照对黄盖鲽仔鱼的生长、发育及摄食有显著影响,各组仔鱼的体长与体高在20日时均产生极显著的差异;Duncan多范围检验表明:40-60lx光照度下仔鱼生长最好;在40-7000lx范围内随光照度的增强,生长则变差,存活率下降,畸形个体增加,暗条件下及3-6lx条件下的仔鱼在12日龄时全部因饥饰物而死亡。在卵黄囊期的各组仔鱼不受外界环境影响,生长情况近似。40-7000lx光照度之间的5且在4日龄至 相似文献
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不同温度条件对鳜仔鱼摄食和生长发育的影响_ 总被引:12,自引:0,他引:12
鳜(Sinipercachuatsi)又称季花鱼、桂鱼,属鲈形目(Perciformes)科(Seranidae)主要分布于我国东部。其肉嫩味美,为淡水鱼类中珍品,鉴于鳜本身的价值以及在人工养殖中尤其是鱼苗繁育过程中的高死亡率,对鳜的研究也陆续见诸... 相似文献
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本文以 PHA 体内注射法制备染色体标本,分析比较了长春鳊(Parabramis pekinensis)、团头鲂(Megalobrama amblycephala)及其杂种F_1的染色体组型与各对对应染色体的相对长度和臂比,探讨了团头鲂×长春鳊两性全育的染色体基础。结果表明,团头鲂×长春鳊是二倍体杂种;上述鱼类二倍体染色体数目均为2n=48,均分为A、B二组,分别由13对中部着丝点染色体和11对亚中部着丝点染色体组成,雌雄个体间均未发现与性别决定有关的异形同源染色体对。团头鲂×长春鳊两性全育的主要原因,很可能在于亲本双方染色体组型完全相同,且各对对应染色体形态很为相近。 相似文献
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抹香鲸与头足类的捕食与被捕食关系,是海洋食物网中的重要组成部分。1978年在山东省胶南县海滩搁浅了一头抹香鲸,经对从其胃中取到的43个头足类角质颚分析鉴定,共发现帆乌贼等7个属。通过将其与世界其他海域抹香鲸胃中头足类组成的比较,论述了抹香鲸的捕食习性,抹香鲸与头足类在营养级金字塔中的位置,拟出了抹香鲸——头足类营养联系的模式。 相似文献
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试验结果表明:(1)2日龄真鲷,牙鲆仔鱼初次摄食,在6 ̄7日龄和5 ̄6日龄,不能建立外源性营养的仔鱼分别进入PNR期,而卵黄囊均在此前1 ̄2天已耗尽。混合营养期分别为3 ̄4天和1 ̄2天。(2)真鲷和牙鲆仔鱼在不同饥饰饿阶段初次摄食率的变化式型是:开始较低,此后逐步上升,高峰期出现在卵黄囊接近耗尽时,此后开始下降。记录到的最高初次摄食率分别为86.7%和35%。(3)牙鲆仔鱼体长的增长率随延迟投饵天 相似文献
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本文通过多因子正交试验、单因子补充试验和生产性试验,观察了盐度、饵料等因子对中国对虾(Penaeus oricntatis)仔虾的生长及其成活率的影响,对室内高密度培养仔虾的几项关键性技术作了探讨。试验结果表明:(1)仔虾的适宜盐度下限为16%左右,最适盐度下限为22%左右,25‰培养效果最佳。(2)第1至第4天仔虾可投喂卤虫(Arteraia salina)幼体。第1天仔虾投饵量为125只/尾,此后日增90只/尾。第5至第20天仔虾可改投颤蚓(Tubifex sp.)、磨碎的蛤仔(Venerupis philippinarum)肉或成体卤虫。投饵量可按W(克/百尾)=0.2482e^0.2064t式计算。式中t为仔虾日龄。(3)培养水中保持0.5—1.0万细胞/毫升密度的扁藻(Platymonas spp.)有明显降低水中氨氮含量的作用。(4)培养水中保持0.5—1.0ppm土霉素,不仅可预防疾病,且有促进仔虾生长的作用。(5)13口池共23立方米水体,共育成平均体长为0.95厘米的仔虾141万尾,每立方米水体出苗量达6.1万尾,总成活率达83.3%。 相似文献
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Philip A. Crocker Connie R. Arnold Joan D. Holt James A. DeBoer 《Journal of the World Aquaculture Society》1981,12(1):122-134
Heretofore few quantitative studies on the tolerance of red drum (Sciaenops ocellata Linnaeus) to freshwater (FW) or dilute sea water have been conducted. In the laboratory we subjected larval and juvenile stages of red drum to dechlorinated FW for 96 hours and found 5% survival in larvae (23-day-old, 6.2 mm SL), 70% for postlarvae (34 and 47-day-old, 16.2 mm to 19.7 mm SL) and 95% for juveniles (57-day-old, 56.9 mm SL). Survival in control salinities of 10 ppt was 90% or greater. The results indicate that tolerance to dilute media is size dependent. In a separate experiment growth of juvenile red drum (52 mm SL) over a 30-day period was compared in two raceways with flow-through supplies of dechlorinated FW, and SW of ambient (35±2 ppt) salinity. SW fish grew significantly larger (P < .01) than those acclimated to FW. Within both treatments a large size differential developed with time. Food conversion efficiency was improved and appetite drive was enhanced in the SW treatment. Percent survival after 30 days was comparably high (93%) in both treatments. Fast growth and high survival of juvenile (>20 mm SL) red drum promote the feasibility of this valuable sport and commercial species in both FW and SW aquaculture. Its potential as a control fish in FW fishery management deserves further investigation. 相似文献
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东海带鱼摄食习性、饵料基础及与渔场的关系 总被引:9,自引:1,他引:9
本文对东海主要渔场中带鱼Trichiurus lepturus Linnaeus的摄食习性、饵料浮游生物的群落结构及数量分布等进行了阐述和分析,并对其与渔场间的关系进行了探讨。研究结果表明,东海带鱼是一种以磷虾等甲壳动物和小型鱼类等为主食,并兼食头足类、毛颚动物等的杂食性鱼类。研究结果还阐明浮游动物生物量及磷虾等的数量分布同东海带鱼渔场的位置变化和鱼群移动的关系密切,其中冬、春季浙江南部近海渔场;夏、秋季长江口及海礁、舟山等渔场,其关系尤为明显。 相似文献
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日本对虾亲虾的暂养、性腺促熟及幼体培育 总被引:3,自引:0,他引:3
本文报告了对日本对虾亲虾进行暂养及切除其单侧眼柄,同时配合适当的生态条件促其性腺成熟等技术措施,并进行了幼体培育。亲虾暂养成活率为83%;促熟率为76.2%;出苗2032.6万尾。 相似文献
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本文研究了用人工授精、孵化方法获得的泥鳅胚胎、幼鱼的形态特征。此项研究于1983年3—5月份在珠海市进行。卵圆球形,具弱粘性,卵径0.72-0.84毫米。在水温19.5—23℃情况下,多数受精卵经26小时40分后孵化出苗。初孵仔鱼全长1.95—2.4毫米,体节26-32对。在水温19—28℃情况下,孵化2天后,幼鱼具长条状外鳃。5天后,幼鱼卵黄囊大部分被吸收。15天后,外鳃消失,内鳃形成。45天后,幼鱼外部形态发育完全,形似成体。 相似文献
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D. E. Aiken D. J. Martin J. D. Meisner J. B. Sochasky 《Journal of the World Aquaculture Society》1981,12(1):225-230
Thirty thousand American lobsters were hatched , stocked at a density of 2,000 per 40-liter planktonkriesel, and exposed to one of three photo-periods (LD 01:23, LD 12:12, LD 23:01) at constant 20°C. Five replicates were completed from March through May. The shortest photoperiods produced the most rapid development and the best survival to Fourth Stage. The longest daily light period produced the largest mean size and greatest size range. At all photoperiods the first larvae to reach Fourth Stage were the largest, and mean size decreased thereafter. Short daily light periods appear to be the most advantageous for larval culture under these conditions because, in addition to producing the best development and survival rates, short light periods reduce algal growth and tank maintenance requirements. 相似文献
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尼罗罗非鱼仔鱼、稚鱼和幼鱼消化系统的发育及其食性的研究 总被引:10,自引:0,他引:10
本文研究了尼罗罗非鱼仔幼鱼消化器官的形态特征及其对食性变化的形态适应;系统地观察了尼罗罗非鱼各发育阶段的食性。 相似文献
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温度和藻类饵料对虾夷马粪海胆摄食及生长的影响 总被引:8,自引:0,他引:8
对虾夷马粪海胆石在10.0-25.0℃水温下单独投喂海带,裙带菜、石莼及15.4-17.8℃混合投喂海带、裙带菜、石莼、铜藻、角叉菜的不同组合和21.6-27.4℃饥饿状态下的摄食、生长及成活进行了试验研究。海胆体重与壳直径的关系为G=0.43132D^2.9958。海胆对海带、裙采、石莼的日摄食率依次降低且随水温变化而异。1.0-3.6cm的纪海胆在10.0-25.0℃下摄食上述海藻均可保持较快 相似文献