池养条件下军曹鱼仔鱼的消化道内容物   总被引：1，自引：0，他引：1  

汤保贵  陈刚  施钢  吴灶和 《广东海洋大学学报》2006,26(1):12-16

采用光镜解剖观察的方法对池塘培育的1~20日龄军曹鱼仔鱼消化道内容物的种类、数量和大小进行研究。结果显示:军曹鱼仔鱼于2日龄开口,主要摄食桡足类无节幼体和桡足幼体及枝角类;在2~20日龄阶段,桡足类在军曹鱼仔鱼食谱中占据主要成分;从13日龄开始摄食虾、蟹类幼体等大型浮游动物,两个阶段的食物选择性指数存在显著差异。  相似文献   

方斑东风螺不同批次卵质量的比较     

黄海立  梁飞龙  符韶  刘定 《广东海洋大学学报》2006,26(4):31-34

2005年5月~8月在雷州市覃斗镇海威水产种苗基地的室内水池进行方斑东风螺亲螺培育,对亲螺不同批次产出的卵囊、卵、及其幼虫进行比较。结果表明:随着亲螺产卵批次的增加,亲螺产卵囊数、卵囊含卵数、产卵量逐次减少;卵囊长、宽逐次变小,厚逐次增加,形状由葵花子片状的比例大变为棒状的比例大;幼虫浮游期逐次延长;变态期幼虫壳长逐次变小;各批次之间的变态率逐次降低;卵径、孵化率、出囊幼虫大小差异不显著。  相似文献   

Effect of n?3 HUFA levels in rotifers and Artemia on growth and survival of larval black sea bream ( Sparus macrocephalus )     

Liu Jingke  Li Kuiran  Huang Bingxin  Chen Xiaolin 《中国海洋湖沼学报》2004,22(4):421-424

Requirement for dietary n−3 HUFA (n−3 highly unsaturated fatty acid) for growth and survival of black sea bream (Sparus macrocephalus) larvae was studied using rotifers andArtemia at various levels of n−3 HUFA. Five treatments with rotifers andArtemia differing in n−3 HUFA were prepared by enriching them with various oil emulsions. Results indicated that dietary n−3 HUFA significantly influence fish n−3 HUFA levels and are essential for growth and survival of black sea bream larvae. The results also indicated that the incorporation of n−3HUFA TG (triacylglycerols) into tissues of larval black sea bream was more effective from natural fish oil in comparison with n−3 HUFA fatty acid ethyl esters from ethyl-esterified oil. Project No. 39770588 supported by the NSFC.  相似文献   

EFFECTS OF ENVIRONMENTAL OXYGEN DEFICIENCY ON EMBRYOS AND LARVAE OF BAY SCALLOP,ARGOPECTEN IRRADIANS IRRADIANS     

王春德  张福绥 《中国海洋湖沼学报》1995,(4)

The experimental results showed that:1) The embryonic development of bay scallop is inhibited ata dissolved oxygen range of 1.38-3.64×10~(-3)at 23℃,and completely blocked below the lower limit.2)The tolerance of larvae to anoxia increased with larval sizes and was related to their oxygen debt.3)The scallop larvae exhibited specific behavioral responses to oxygen deficiency,which finally led tovelum disintegration and larval death.The possible relationship between environmental oxygen deficien-cy and the disease of disintegration of the larval Velum is also discussed.In this study,considerableoxygen debt was found in bay scallop larvae,which was greater in small animals.Based on the worksof previous authors,a new concept is proposed for the estimation of oxygen debt,namely,thecompensatory rate of oxygen debt(CROD).This can be used in intra-or interspecific comparison ofoxygen debt.The results can be helpful in the management of water quality and for the prevention oflarval diseases encountered in scallo  相似文献   

Seasonal and short-term variations in abundance of barnacle larvae near the South-West of the Isle of Man     

S.D. Salman 《Estuarine, Coastal and Shelf Science》1982,15(3):241-253

Larvae of five species of sessile barnacles were found to be common within 4 miles of Port Erin, Isle of Man. These are Balanus balanoides, B. crenatus, B. balanus, B. hameri and Verucca stroemia. Larvae of other recorded species were very rare or absent.The major larval release of all the common species occurred in late winter and spring, but V. stroemia continued to breed throughout most of the year, and there was some evidence of autumn breeding of B. crenatus on a very small scale. The major release of nauplii by most of these species occurred at the time of the spring diatom outburst.The larval life of each of the four species of Balanus is estimated to last 3–5 weeks, that of V. stroemia 7–8 weeks.Some observations suggested that the larval release of B. balanoides may be stimulated by spring tides, but other observations seemed to contradict this. Larval release may be inhibited by turbulence.  相似文献   

黄河口近岸海域鱼卵、仔稚鱼种类组成及群落结构特征     

徐华  王斌  张聪  李凡  杨艳艳 《海洋科学》2021,45(11):105-117

为了解调水调沙期间黄河口及邻近海域鱼卵、仔稚鱼群落结构的动态变化,作者分别于2011年和2018年黄河调水调沙期间（6月—7月）,利用大型浮游生物网对该海域的鱼卵、仔稚鱼进行表层水平拖网调查。结果表明：2011年3个航次共采集鱼卵1 280粒,仔稚鱼5 973尾,隶属于7目11科13属;2018年3个航次共采集鱼卵4 104粒,仔稚鱼237尾,隶属于7目11科13属。优势种以斑鰶（Konosirus punctatus）、鳀（Engraulis japonicus）和赤鼻棱鳀（Thryssa kammalensis）等短生命周期、低营养层级的小型中上层鱼类为主。靠近黄河入海口处站位的鱼卵、仔稚鱼密度相对较高,鱼卵、仔稚鱼分布范围向黄河入海口门处集中。鱼卵、仔稚鱼的多样性指数在调水调沙过程中出现波动,过后又恢复至调水调沙前水平。环境因子Pearson相关性分析表明,鱼卵数量与环境因子间无显著相关性（P0.05）,仔稚鱼数量与叶绿素a的含量呈极显著正相关（R=0.870,P<0.01）。两个年度调查结果对比发现,总体来说调查期间黄河口及邻近海域鱼卵、仔稚鱼种类数变化不大,在适温类型组成上均以暖温种为主;2018年鱼卵、仔稚鱼采集数量均小于2011年,但是鱼卵、仔稚鱼的均匀度指数（J’）和多样性指数（H’）均大于2011年,除6月上旬航次外,其他两个航次丰富度指数（D）也均大于2011年。本研究补充了黄河口及邻近海域鱼类早期补充资源的基础数据,旨为黄河口邻近海域及渤海的渔业资源评估和养护提供依据。  相似文献   

文蛤MERETRIX MERETRIX LINNAEUS工厂化人工育苗试验   总被引：1，自引：0，他引：1  

吴洪喜  徐爱光  蔡志飞 《海洋湖沼通报》1998,(3)

文蛤的人工催产、浮游幼虫培育和稚贝水泥池培养试验结果表明：（1）用阴干与流水结合的方法刺激亲贝能获得理想俏产效果。（2）在水温28．0～29．1℃,比重1．0160—1．0187,pH值8．2－8．4条件下,用亚心形扁藻作文蛤D幼的开口饵料和壳顶幼虫饵料,生长快（日增长高达24．5μm）、成活率高（72．3％）、浮游期短（仅5－6天）。（3）文蛤眼点功出水泥池无砂底附苗试验获得成功,且单位面积附苗量高达433．3万颗／m2。（4）室内水泥池铺砂培养文蛤稚贝,前期生长快,但当壳长达300μm后,稚贝分泌一种粘液,生长和成活受到影响。建议定期翻池洗苗,当壳长达500μm后尽早将苗移至池塘内砂滩培养。  相似文献   

中国对虾幼体发育阶段维生素A营养需要的研究   总被引：5，自引：0，他引：5  

梁萌青  季文娟 《海洋与湖沼》1999,30(2):150-154

１９９６年５月１１日－６月１３日中国在水产科学研究院黄海水产研究所麦岛实验基地采集中国对虾幼体,在其配合饵料中添加维生素Ａ,对其发育阶段维生素Ａ的营养需要进行研究。结果表明,配合饵料中维生素Ａ的含量为４０．１６－６．１５μｇ／ｇ时,对中国对虾幼体的变态,成活和健康有明显的促进作用。  相似文献   

白垩纪中期缅甸琥珀中的水虻下目化石     

刘宇明  黄迪颖 《地质论评》2020,66(S1):3-5

  相似文献   

光照对凡纳滨对虾幼体变态发育的影响   总被引：2，自引：0，他引：2  

欧黄思  梁华芳 《海洋科学》2017,41(3):55-60

为了解光照对凡纳滨对虾(Litopenaeus vannamei)幼体发育和存活率的影响,作者在研究中设定了4种单色光(红、黄、蓝、绿光)及不同光照强度(0、1 500、5 500、12 000 lx)进行实验并就光照对幼体产生的影响进行分析。实验表明:4种单色光对幼体发育变态时间和成活率都有较大影响。幼体从ZⅠ变态发育至仔虾P1,蓝光的幼体发育时间最长,为262.83 h,比对照组多28 h;黄光存活率最低,只有14.49%,比对照组低25.00%,差异显著(P0.05)。同时,凡纳滨对虾幼体在不同的发育阶段对不同光色的敏感度不同,红光和黄光只对溞状幼体变态有较明显的抑制作用,但对糠虾幼体的发育却有促进作用;蓝光和绿光对整个发育阶段都有影响。光照强度对幼体的存活和变态影响差异显著(P0.05)。幼体从ZⅠ发育至P1,12 000 lx光照下幼体变态发育耗时最长(257.33 h),存活率最低(1.63%)。在溞状幼体期,光照大于1 500 lx时,幼体的变态时间增加,存活率下降。糠虾幼体期可适应光照在5 500 lx以下的环境,而仔虾期则可适应120 000 lx的光照。建议根据不同发育阶段调整光照强度,当幼体在ZⅠ时,光强应控制在1 500 lx以下,之后可逐渐增强。本实验结果可为凡纳滨对虾育苗期间的光照管理提供基础数据和理论依据。  相似文献