锯缘青蟹幼体消化酶活力昼夜节律的实验研究

定活性培育条件下,锯缘青蟹幼体「蚤状幼体（Ｚ５）、大眼幼体（Ｍ）」４种消化酶（蛋白酶、α－淀粉酶、纤维素酶和脂肪酶）比活力的昼夜变化,结果表明,青蟹幼体４种消化酶活力表现出昼夜节律,蜕皮后第２天的Ｚ５幼体,其４种消化酶比活力仅表现出一种单相周期型昼夜变化模式为临变态到Ｍ的Ｚ５幼体和Ｍ幼体,其４种消化酶活力则表现出４种不同的昼夜变化模式,讨论了青蟹幼体消化酶活力昼夜节律可能的调节机制,初步认为,幼体消化酶活力的昼夜节律主要受发育期和蜕皮周期的影响,并通过激素这个中间环节控制的消化酶的合成和分泌。     

池养条件下鲶鱼苗生长的研究

在人工饲养条件下,鲍鱼苗有明显的昼夜摄食节律性,以夜间２０：００￣２３：００摄食活动最强,鱼苗间互相残杀现象严重,饥饿时尤甚,经统计分析,鲶鱼苗的生长存在着显著的个体差异,全长与日龄之间呈直线关系,体重与日龄之间呈幂函数关系,且在不同温度时回归方程不同,开口摄食前体重为负增长,鲶在鱼苗阶段就与成鱼的体型基本相似,两者无显著的差异。     

牛磺酸强化轮虫对眼斑拟石首鱼仔鱼的投喂效果

研究用3种不同质量浓度梯度(分别为T0组:0 mg/L;T4组:400 mg/L;T8组:800 mg/L)牛磺酸强化的轮虫(Brachionus plica tilis)对3~20日龄的眼斑拟石首鱼(Sciaenops ocella tus)仔鱼的投喂效果.结果表明,T8组的仔鱼平均全长((8.5±0.8)mm)和成活率(70.5%)都明显高于T0组(平均全长:(6.3±1.0)mm;成活率:28.4%)和T4组(平均全长:(7.0±0.8)mm;成活率:27.4%),T0组和T4组之间生长和成活率并无显著差异;T8组仔鱼的耐干露及耐高盐度(65)能力明显比T0组和T4组强,即仔鱼的抗应激能力受轮虫强化剂牛磺酸的质量浓度影响显著(P<0.05).     

Anisakis simplex complex (Nematoda: Anisakidae) in zooplankton communities from temperate NE Atlantic waters

The euphausiid Nyctiphanes couchii and an unidentified mysid have been found, for the first time, with third-stage larvae (L₃) of the Anisakis simplex complex in the mesozooplanktonic community of the coastal upwelling system in Galicia (NW Spain). Parasite larvae were molecularly identified using the internal transcribed spacer (ITS) region. The prevalence of these parasites in the euphausiid population was 0.0019%. The existence of parasites in a variety of mesozooplankton organisms suggests that the transmission routes of A. simplex sensu stricto and A. pegrefii are wider than expected. The results suggest that these two Anisakis species are not specific to their intermediate hosts. Finally, the recruitment of A. simplex complex may be affected by oceanography, differing under upwelling or downwelling conditions.     

三倍体太平洋牡蛎苗种培育研究

报道了2000年9－12月在浙江温岭市东门水产育苗场进行的三倍体太平洋牡蛎苗种培育研究结果，用浓度为70－100μmol/L的6－二甲氨基嘌呤（6－DMAP）诱导受精卵，抑制第二极体的释放，共获得附着稚贝（壳长0．8－1.0mm)5712万颗，平均三倍体倍化率为62％，同时讨论了倍化率与诱导时间，效应时间，卵子成熟度之间的关系。     

不同温度下交织顶孢霉对六星黑点豹蠹蛾幼虫的致病力研究

研究了不同温度下交织顶孢霉[Acremonium implicatum(Miller et al.)Gams]对六星黑点豹蠹蛾(Zeuzera leuconotum Butler)幼虫的致病力.分别测试18℃,23℃,28℃,33℃和38℃共5个温度梯度下对六星黑点豹蠹蛾幼虫的感染及致死情况.结果表明:在28℃下,交织...     

河蟹后期亲体保存及早期蚤状幼体病害防治的研究

报导了用降低温度的方法延长河蟹抱卵期的胚胎发育时间，从而达到保存后期育苗亲蟹的目的：结果显示：从眼点期至幼体孵出所需时间为：水温约１９℃需７天，水温约１６℃需１１天，水温约８℃需２４天。在河蟹早期育苗过程中用鳗净和磺胺类抗菌素进行水体消毒，使Ｚ１至Ｚ２变态成活率达８０％以上。     

人尿激酶原变体(K151E,R154G)在家蚕中的高效表达

Ｔｈｅｓｉｌｋｗｏｒｍｅｘｐｒｅｓｓｉｏｎｓｙｓｔｅｍｉｓａｗｅｌｌ ｋｎｏｗｎｅｃｏｎｏｍｉｃａｌｗａｙｏｆｏｖｅｒｐｒｏｄｕｃｉｎｇｒｅｃｏｍ ｂｉｎａｎｔｐｒｏｔｅｉｎ .Ｉｎｔｈｉｓｌｅｔｔｅｒ ,ｔｈｅｃＤＮＡｏｆａｍｕｔａｎｔｏｆｓｉｎｇｌｅｃｈａｉｎｕｒｏｋｉｎａｓｅ ｔｙｐｅｐｌａｓｍｉｎｏｇｅｎａｃｔｉｖａｔｏｒ(ｒｓｃｕ ＰＡ) ｇｅｎｅ ,ｍｓｃｕ ＰＡ(Ｋ1 5 1Ｅ ,Ｒ1 5 4Ｇ) ,ｗａｓｒｅｃｏｎｓｔｒｕｃｔｅｄｔｏｉｎｃｌｕｄｅｔｈｅｎａｔｕｒａｌｕｒｏｋｉｎａｓｅ(ｕ ＰＡｏｒＵＫ)ｓｉｇ…     

Observations on the heather beetle Lochmaea suturalis (Thomson) (Coleoptera,Chrysomelidae) and its parasitoids

A small population of the heather beetle Lochmaea suturalis (Thomson) in southern England was found to be parasitized by Asecodes mento (Hymenoptera, Eulophidae) and by Degeeria collaris (Diptera, Tachinidae). In recent years outbreaks of L. suturalis in The Netherlands have resulted in alterations of vegetational patterns and this has caused concern. It is suggested that the possibility of biological control of the beetle by A. mento should be investigated.