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Growth and mortality of sibling triploid and diploid Sydney rock oysters, grown at two tidal heights, three stocking densities and three different sites on the Camden Haven River estuary, were compared. Triploids grew faster than diploids. The majority of the growth rate difference occurred after the oysters reached 2 years of age. By 3.2 years, triploids were 49% heavier than diploids. Oysters grown intertidally were larger than those grown subtidally. Oysters stocked at the lightest density of 2 L per basket grew to a significantly larger size than baskets stocked at 3 or 4 L. Growth rates were significantly different at the three sites. Growth was reduced the further the oysters were from the mouth of the estuary. There was no significant difference in mortality between ploidy level, but there were differences between tidal heights, stocking densities and sites. Intertidal oysters suffered higher mortality than subtidal. Oysters stocked at the highest density had a significantly higher mortality than the lowest density; neither of these was significantly different from the medium density. The site closest to the mouth of the estuary had significantly lower mortality than the middle and upper estuary sites. 相似文献
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从成熟卵子的核相与体外促熟,精子的顶体反应,受精膜的形成,极体的释放与雌雄原核的形成以及多精入卵方面综述了贝类受精细胞学的研究成果,并展望了这一领域的研究和应用前景。 相似文献
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对浙江沿海采集的标本进行了整理、鉴定,共有织纹螺科动物1属13种,其中1个新种,1个未定种。 相似文献
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沅江南洞庭湖软体动物资源初步调查 总被引：1，自引：0，他引：1
对沅江南洞庭湖部分湖泊软体动物资源作了初步调查.结果计有单壳类软体动物10种,隶属腹足纲的3科6属,其优势种为梨形环棱螺、铜锈环棱螺、方格短沟蜷等;计有双壳类软体动物25种,隶属于双壳类的3科13属,其优势种为三角帆蚌、背瘤丽蚌、洞穴丽蚌、河蚬等,表明该地区的软体动物数量较为丰富. 相似文献
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Sei-Ichi Okumura Katsutoshi Arai Yoshitaka Harigaya Hirotaka Eguchi Mizuho Sakai Hiroaki Senbokuya Suehiro Furukawa Kunio Yamamori 《Fisheries Science》2007,73(2):237-243
ABSTRACT: In order to develop a highly efficient method for mass production of triploid Pacific abalone Haliotis discus hannai , caffeine treatment that is safe and inexpensive was optimized. To suppress the first meiotic division, fertilized eggs were exposed to either a 10- or 15-mM caffeine solution for 24 min beginning at 12 min after fertilization. In most treated batches, the rates of cleaved eggs showed no significant difference from the control batches. However, in most treated batches, the rates of occurrence of normal larvae and the survival rates of the early juveniles were significantly lower than those of the controls. The triploid rates at 6 days to 11 months after settlement in all the treated batches were extremely high (91–100%). There was no significant difference in the mean triploid rates between 10- and 15-mM caffeine treatments. These results suggest that both treatment conditions were conducive to triploid abalone production. One live 2n/3n mosaic specimen was found in the treated batches. However, since the frequency of mosaic was extremely low, the mosaicism would probably not have an adverse effect on the stable production of triploid abalones. 相似文献
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金属硫蛋白(Metallothionein,MT)是一种低分子量的蛋白质,广泛存在于大多数生物体内,在参与必需金属元素调节和非必需金属元素的解毒等方面具有重要作用。介绍了MT的结构与功能,对贝类MT的诱导机制、解毒机理、降解与金属排除进行概述,探讨了MT诱导合成过程中的一些主要影响因素。由于贝类MT能够通过多途径诱导,而且存在众多的环境因素和自身生理因素的影响,MT的变化规律往往出现较大的波动性。因此,今后的研究重点会是贝类MT作为污染监测指示物的研究、重金属诱导MT数学模型的构建以及贝类MT产品的开发等方面。 相似文献
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重金属诱导贝类金属硫蛋白研究进展 总被引：5，自引：0，他引：5
金属硫蛋白(Metallothionein,MT)是一种低分子量的蛋白质,广泛存在于大多数生物体内,在参与必需金属元素调节和非必需金属元素的解毒等方面具有重要作用。介绍了MT的结构与功能,对贝类MT的诱导机制、解毒机理、降解与金属排除进行概述,探讨了MT诱导合成过程中的一些主要影响因素。由于贝类MT能够通过多途径诱导,而且存在众多的环境因素和自身生理因素的影响,MT的变化规律往往出现较大的波动性。因此,今后的研究重点会是贝类MT作为污染监测指示物的研究、重金属诱导MT数学模型的构建以及贝类MT产品的开发等方面。 相似文献
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对中国近海采集的标本进行了整理、鉴定,共有隅海牛科动物5属14种,其中有1个新记录。 相似文献