排序方式: 共有19条查询结果,搜索用时 296 毫秒
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采用f/2培养基,研究了不同浓度的Cu(Ⅱ)、Zn(Ⅱ)和Pb(Ⅱ))对牟氏角毛藻Chaetoceros muelleri生长的影响。结果表明:在特定浓度条件下,3种重金属离子对牟氏角毛藻的生长具有显著影响。当Cu(Ⅱ)浓度为0.1 mg/L、Zn(Ⅱ)和Pb(Ⅱ)浓度为0.1~1.0 mg/L时,能促进牟氏角毛藻的生长;Zn(Ⅱ)和Pb(Ⅱ)浓度为10~50 mg/L时,牟氏角毛藻能维持一定的速率生长;Cu(Ⅱ)浓度为1~50 mg/L时,牟氏角毛藻的生长受到显著抑制。 相似文献
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María Concepción Lora-Vilchis Beatriz Cordero-Esquivel & Domenico Voltolina 《Aquaculture Research》2004,35(11):1086-1091
Survival, growth (length and weight), development, proximate composition, and energy content of Artemia franciscana fed for 7 days with Isochrysis sp. (TISO) or with Chaetoceros muelleri (CHGRA) were compared to evaluate the food value of these microalgae. Mean daily survival was not significantly different, and ranged from 86% to 93%. Diet‐related differences in growth were noted from the third day, and mean final dry weights (DWs) were 171 and 327 μg ind?1 for Artemia fed TISO and CHGRA respectively. Rates of development were different between diets, with a higher developmental index for Artemia fed TISO before day 3, and a higher index for Artemia fed CHGRA for the rest of the experiment. Chemical analysis showed that carbohydrates decreased to approximately 35% of the initial value in Artemia during the first 24 h, after which they remained approximately stable and similar with both diets. In percentage of total DW, lipids and proteins remained close to their respective initial values, but A. franciscana fed TISO had a higher ash content. A major difference between the two microalgae was the higher protein content of TISO, but this did not result in better growth. Of the two, TISO was richer in docosahexaenoic acid, which might explain the initial faster development, but CHGRA was a better source of eicosapentaenoic acid, which is the most probable explanation of the higher food conversion index, specific growth rate, and energy gain of A. franciscana fed this algae. 相似文献
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氮磷铁营养盐浓度对牟氏角毛藻生长的影响 总被引:5,自引:0,他引:5
采用正交设计法,研究了不同营养盐浓度对牟氏角毛藻生长的影响。结果表明,氮磷铁三种营养因子对其生长都有显著影响,而氮的作用最为明显。发现当氮磷铁的浓度在30、3、0.1mg/L时牟氏角毛藻生长最好,即在实验条件下,培养牟氏角毛藻的m(N)∶m(P)∶m(Fe)的理想比例为10∶1∶0.03。 相似文献
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基于对虾生物絮团集约化养殖尾水含有高浓度硝态氮和磷酸盐的特征,比较分析钝顶螺旋藻(Spirulina platensis)、牟氏角毛藻(Chaetoceros muelleri)、盐藻(Dunaliella sp.)3种微藻在配制尾水中的存活生长状况及其对无机氮磷的去除效果,以期筛选出适宜的微藻用于后续尾水净化技术。采用显微镜计数法测定藻细胞密度,国标法测定总无机氮、氨氮、硝态氮、亚硝态氮和磷酸盐的含量。结果显示,钝顶螺旋藻在实验前后的藻细胞密度变化不大(P>0.05),约为3.32×106 个/mL和5.88×106 个/mL;牟氏角毛藻和盐藻细胞密度有明显增加(P<0.05),分别从初始的4.00×104 个/mL和2.50×105 个/mL升高至实验结束时的1.66×106 个/mL和1.06×107 个/mL。经过16 d实验,钝顶螺旋藻组对硝态氮和总无机氮去除率分别为79.60%和46.06%,显著高于其他各组(P<0.05),第8天时对磷酸盐的去除率可高达98.55%;牟氏角毛藻组16 d的磷酸盐去除率为98.25%,显著高于其他各组(P<0.05)。研究表明,3种微藻均可在对虾养殖尾水环境中存活,且对尾水氮磷具有较好的净化效果。 相似文献