2012, 19(4):568-576.
摘要:betweenlateembryoandlarvalstageswasstudiedbymicroscopicobservationofserialsections.Atawatertemperatureof10.0–16.2°C,theorderofappearanceoflymphoidorganprimordiawasthymus,headkidneyandspleen.Theprimordiumofthethymusformed5dbeforehatchingandsmalllymphocytesappeared1dbeforehatching.Nineteendaysafterhatching,connectivetissueandbloodcapillariespenetratedintotheparenchymaofthethymusandthetrabeculaeappeared.Differentiationintoindistinctinnerandouterzonesoccurredafter35d.Theheadkidneyprimordium,whichconsistedofundifferentiatedhemopoieticstemcells,appeared2dbeforehatching.Kidneytubuleswereformed3dafterhatchingandlymphoidorgansafter10d.Between35dand40dafterhatching,theepitheliumoftherenaltubulesbegantodegradeandbloodsinusesappearedintheheadkidney.Whentherenaltubuleshaddegeneratedcompletely50dafterhatching,theheadkidneywascomposedprincipallyoflymphoidtissueandalargenumberofbloodsinuses.Thespleenprimordiumappeared5dafterhatchingandtheorganbecamelymphoidonthe16thday.Capillariesandbloodsinuseswereformedinthespleenbetween35dand50d.Weconcludethattheimmuneorgansaredifferentiatedearlierinthaninotherfishes.Althoughtheoveralldevelopmentratewasrelativelyslowin
2012, 19(4):671-678.
摘要:月、抚远江段(;最小值分别出现在绥滨、黑河、三江口江段黑龙江中游浮游植物的多样性表现出明显的季节变化规律夏季较春、秋季丰富。应用灰关联分析评价黑龙江中游水质类别呈现黑河、逊克、嘉荫、萝北、绥滨、三江口、抚远采样点水质与《地表水环境质量标准》20020.856Ⅱ类能够满足珍稀水生生物栖息地、鱼虾类产卵场、仔稚幼鱼索饵场的水质要求。同时件。
2012, 19(4):679-689.
摘要:数据CPUE的空间叠加图热带界深度都具有明显的季节性变化中心渔场界温度范围为从马达加斯加岛北部沿非洲大陆至索马里附近海域下界深度范围分别是m理论
2012, 19(4):690-699.
摘要:以上的水层1SD)差异很大2库浮游植物年平均密度和生物量分别为cells·L他座水库各指数之间的差异均达到了极显著水平
2012, 19(4):700-706.
摘要:生长性状均存在显著的正相关性<0.05),,
2012, 19(4):715-720.
摘要:龄贝植核组、龄贝对照组按照常规技术进行插核手术与海区养殖450、,组留核率、珍珠层厚度、优质珠率和珍珠产量的差异。结果表明15180天个组的平均体质量和成活率均存在显著性差异和),);天组留核率、珍珠厚度、优质珠率和珍珠产量均显著大于本研究旨在养殖模式提供