共查询到19条相似文献,搜索用时 65 毫秒
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对不同品系的低孵化率卤虫卵进行了孵化对比试验,分为试验组和对照组,其中试验组添加孵化强化剂与对照组进行同等条件的试验,2组对照组的孵化率分别是66.8%、64.9%,试验组的孵化率分别是84.3%、81.5%增幅超过15个百分点,说明这种针对低孵化率卤虫卵研制的强化剂有效可行,可做进一步推广试验。 相似文献
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作者设计一种摇瓶法与目前国内常用的烧杯法对同一卤虫卵样品进行孵化率测定,其平均值分别为84.85%和80.90%,前者显著高于后者。两种方法比较,摇瓶法的测定结果更准确。 相似文献
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介绍了国外测定卤虫卵孵化率的6种方法,并对各种方法的优、缺点进行了简要的评述。其中有4种方法是国外卤虫卵生产公司内部掌握使用的,在公开刊物中无法查到。现公开介绍大家,希望对卤虫卵的研究者、生产应用者和经销者都有所裨益。 相似文献
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中国卤虫卵孵化温度特性的研究 总被引:1,自引:0,他引:1
依据有效积温法则,对中国12个主要地理品系卤虫卵的孵化速度、发育起点温度及其发育同步性作了分析。结果表明,各品系的孵化速度因温度不同而差异极显著;相同温度下各品系间孵化速度也有显著差异;在沿海品系中,其发育起点温度由北往南基本呈递增趋势。以各品系孵化发育历期的变差系数作为发育同步性的衡量指标,依据发育同步性程度及发育起点温度、有效积温进行聚类分析,提出了适合我国卤虫卵加工及使用的最佳品系组合。 相似文献
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现行几种卤虫卵孵化率测定方法的比较 总被引:1,自引:0,他引:1
本文通过对国内外现行4种卤虫卵孵化率测定方法的比较,找出了各种方法产生误差的原因,从理论和实践上论证次氯酸钠溶壳方法的科学性和实用性。 相似文献
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根据本人在数年卤早资源调查和虫卵加工以及销售工作后,对国内卤虫精卵的常见孵化率测定方法和国际通用的卤虫卵孵化率测定方法进行比较。评述其优缺点。并认为国内常见的静态镜检法和动态镜法和[1]比利时肯特大学P.SORGELOS等所推荐的方法A和B法是一致的。但工作过程必须按要求程序进行,否则将有较大误差。 相似文献
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The residual water from intensive aquaculture production systems can be utilized in integrated multitrophic cultivations. In this work, Artemia franciscana received daily feedings of 10 mg L?1 of Tetraselmis chuii, Nannochloropsis oculata and Chaetoceros muelleri, which were grown using residual water from an intensive biofloc Litopenaeus vannamei cultivation system. The goal of this study was to verify which species provide the best zootechnical performance and best crustacean biomass production efficiency. After 12 days of cultivation, A. franciscana wet biomass was 815.64 ± 18.74, 650.81 ± 83.98 and 40.76 ± 4.08 mg L?1 with C. muelleri, T. chuii and N. oculata (P < 0.05), with significant differences in dried biomass as well. As for the microalgae cultivation in the alternative culture medium, T. chuii had higher dry biomass gain, requiring less culture volume to achieve 10 mg L?1 and become ready to feed Artemia. Thus, T. chuii was the most efficient in Artemia biomass production with 0.83 L compared to 1.54 L g art?1 in C. muelleri. C. muelleri is recommended for feeding A. franciscana for biomass production purposes. However, due to its better efficiency, T. chuii can be selected to be part of a multitrophic system. 相似文献
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Roman Sebesta Dariusz Kucharczyk Joanna Nowosad Mateusz Sikora Vlastimil Stejskal 《Aquaculture Research》2018,49(9):3151-3157
This 28‐day study investigated the effect of three rearing temperatures, 11, 15 and 19°C, on survival and growth of maraena whitefish fry in a recirculating aquaculture system. Three groups of larvae in three repetitions were reared in recirculating system. Each group comprised 200 larvae. Feeding level was fixed at 500–700 Artemia sp. metanauplii per fish per day. Larvae were fed fresh live brine shrimp at 10 ml/tank every 3 hr. Significantly higher body weight (p = 0.00), total length (p = 0.00), larval yield (p = 0.00) and condition factor (p = 0.00) were obtained at 19°C compared to 15 and 11°C, as well as at 15°C compared to 11°C. Significantly higher survival (p = 0.00) was observed in larvae reared at 11 and 15°C compare to 19°C and no significant differences were observed between 11°C compared to 15°C. No significant differences in size heterogeneity among treatments were found (p = 0.46). In larviculture, the optimal assessed temperature for growth of maraena whitefish was 19°C, with highest survival observed at 11°C, at the end of this 28 days trial. The findings in this study apply to the particular study location and may not be applicable more broadly. 相似文献
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为寻找卤虫卵的合适代用饵料,降低河蟹育苗成本,在1997年春季各期河蟹育苗中,进行投喂“高成”牌开口微囊配合饵料试验。结果;试验池幼体胃肠饱满度好,蜕壳时间短,变态整齐,成活率与对照组判别不五,而成本仅为对照池的45%,经济效益显著,且不会对以后幼体发育造成不良影响。 相似文献
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João Gomes Cristina Lobo Vilela Ricardo Bexiga Gonçalo D Nunes Nuno Pereira & Lina M Cavaco 《Aquaculture Research》2007,38(6):613-617
Optimization of antibiotic delivery strategies to aquatic environment and to the specific characteristics of the target species is essential for the improvement of bacterial infection control measures. This work aimed at standardizing the use of Artemia salina to deliver flumequine to fish as antimicrobial treatment. Adult Artemia were used to bioencapsulate flumequine. A flumequine concentration of 358 μg mL−1 was found adequate to perform bioencapsulation during 24 h without causing mortality. Antibiotic concentration in Artemia, quantified by means of a microbiological assay based on MIC determination, using Escherichia coli ATCC 25922 as control strain was 256.55 mg g−1 (±71.22). The therapeutic doses of 10 mg kg−1 BW, calculated on the basis of a consumption of about 4% BW/day, would then be delivered by the consumption of 7.8 Artemia g−1 of fish. 相似文献