共查询到18条相似文献,搜索用时 62 毫秒
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为验证由生产培养获得的不同质量的底栖硅藻培养皱纹盘鲍不同生长阶段幼体的效果,采用经不同培养措施获得的两类底栖硅藻群落(饵料A和饵料B)培养皱纹盘鲍前期匍訇幼体和稚鲍.试验结果表明,饵料A培养前期匍匐幼体的存活率[(43.47±13.53)%]显著高于饵料B[(6.94±5.17)%],但生长指标差异不显著.两类饵料培养的稚鲍存活率差异不显著,但饵料B的生长速度和特定生长率[(0.151±0.025)mm/d和(4.706±0.492)%/d)]显著高于饵料A[(0.103±0.022)mm/d和(3.625±0.374)%/d)].说明皱纹盘鲍幼体在不同生长阶段适应底栖硅藻的种类不同.匍匐幼体期对底栖硅藻质量要求较高,稚鲍期由于食量增加和食性转化,对饵料数量的要求表现得更为明显. 相似文献
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不同单胞藻饵料培养九孔鲍早期稚贝的研究 总被引:3,自引:1,他引:2
以单种培养的6种底栖硅藻和具有底栖习性的亚心形扁藻(Platymoras sp.)为饵料,培养九孔鲍(Haliotis diversi-color supertexta)受精后12 d的早期稚贝并观察其生长和存活,培养期为28 d,目的是筛选能维持早期稚贝高存活率和生长率的藻种。实验结果表明,培养稚贝成活率最高的3个藻种由大到小依次是爪哇曲壳藻亚缢变种(Achnanthes javanica var.)、流水双眉藻(Amphora fluninensis)和亚历山大菱形藻(Nitzschia alexandrina),使稚贝生长最快的3个藻种由大到小依次是流水双眉藻、爪哇曲壳藻亚缢变种和亚历山大菱形藻。研究结果揭示了适宜的底栖硅藻种类对鲍早期稚贝阶段生长和存活的重要性。个体小或者胞外产物量大的藻类很可能对九孔鲍早期稚贝的培养是有利的。 相似文献
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底栖硅藻大面积培养技术 总被引:2,自引:0,他引:2
底栖硅藻是从鲍上足分化匍匐幼体附着变态到长至壳长达3-5mm的稚鲍所必需的饵料。底栖硅藻质量的优劣,直接影响到鲍苗培育的成活率。因此培养足量的优质底栖硅藻是鲍人工育苗生产中最为重要的环节。本文重点围绕高密度、优质底栖硅藻规模化培养技术进行探讨,总结了一套底栖硅藻大面积培养技术, 相似文献
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底栖硅藻作为鲍幼体的前期饵料,其种类与质量对鲍人工育苗的成败起着至关重要的作用,其种类适宜且数量充足可以延长鲍幼体的附着变态率,延长在板时间,实现剥离大规格苗种,达到提高成活率的目的。据报道在底栖硅藻自然种群中,以小型的卵形藻(Cocconesp.)和舟形藻(Naviculasp.)的 相似文献
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在15.0℃、17.5℃和19.0℃3个温度梯度下,各试验组纪体的生长速度和成活率6.3μm/d,8.6μm/d、9.3μm/d;61.0%、70.5%、23.0%。投附着基经22d培养各试验组稚贝规格(壳长×壳高)分别平均为620μm×595μm、705μm×680μm、745μm×710μm;各组生长速度和附着后成活率分别为17.7μm/d、21.6μm/d、23.4μm/d;35.4%、34 相似文献
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本对2~4mm的杂色鲍稚鲍进行了2%酒精麻醉剥离试验,并以手工剥离为对照。结果表明酒精麻醉6分钟的剥离效果与手工效果相近,而麻醉8或10分钟的效果差,死亡率高。因此,对于杂色鲍稚鲍的剥离,用2%酒精麻醉5~6分钟为最适浓度及处理时间。 相似文献
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在自然光周期下,分别在高温长光照和低温短光照的两个节季节,采用控制光照强度的方法进行对九孔鲍幼虫及幼鲍50d左右培育的小型试验。结果表明,光照强度对附着基上摄食微藻的幼虫及幼鲍生长和存活等有重要的影响。对幼虫及幼鲍最适宜的光照强度,在高温长光照下为700-1200lx,在低温短光照下为1300-2000lx。选用适宜的光照强度在高温长光照和低温短光照下先后进行了3次经量育苗试验,获得了与小型试验相同的结果。 相似文献
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研究了后期面盘幼虫不同采苗密度、不同底栖硅藻与稚鲍不同培育密度,对鲍苗的生长与成活率的影响。认为最佳采苗密度应为2万个/m2后期面盘幼虫;当地底栖硅藻混合种的饵料效果优于纯种,剥离后稚鲍的培育密度不直超过4000粒/m2。在640m2水面中有出壳长1.2~1.5cm鲍苗201.6万粒,平均出苗量3150粒/m2。专家鉴定认为,本课题在皱纹盘鲍不同育苗密度、不同饵料对育苗效果的研究方面居国内领先水平。 相似文献
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盐度对九孔鲍摄食_生长及存活的影响 总被引:6,自引:0,他引:6
九孔鲍摄食人工饲料的盐度范围为20 ̄38,其中较适宜的盐度范围为25 ̄35,在此盐度范围内,小规格鲍(平均壳长1.30cm,平均体重0.37g)的壳长日增长为91.5 ̄102.3μm,日增重为8.60 ̄12.55mg;大规格鲍(平均壳长2.7cm,平均体重2.3g)的壳长日增长为56.30 ̄81.80μm,日增重为12.68 ̄22.48mg,其最适生长的盐度为30 ̄35,存活率为97% ̄100%。 相似文献
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Growth and survival of three small abalone Haliotis diversicolor populations and their reciprocal crosses 总被引:1,自引:0,他引:1
The aquaculture industry of small abalone Haliotis diversicolor in southern China is now close to collapse because of high mortality at the grow-out stage. To examine if survival and growth (shell length increase) could be improved by cross breeding among populations, a 3 × 3 complete diallel cross was conducted among three populations from Japan (A), Taiwan (B) and Vietnam (C). Performances in growth rate and survival at early juvenile, later juvenile and grow-out stages were compared among the six reciprocal cross lines and three parental lines. Magnitude of heterosis for survival and growth varied among cross lines in the three growing stages. As to mid-parent heterosis, H AB was significantly ( P <0.01) higher than H AC and H BC at all three growing stages for both growth and survival, and all mid-parent heterosis fell between the two corresponding single-parent heterosis. H AB was 6.84% for shell length and 69.09% for survival at Day 420. Our results of high survival heterosis in line AB and line BA show that crossbreeding between different populations can benefit the small abalone breeding programs and the industry. 相似文献
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Toshihiro Onitsuka Tomohiko Kawamura Satoshi Ohashi Toyomitsu Horii Yoshiro Watanabe 《Fisheries Science》2007,73(2):295-302
ABSTRACT: The feeding behavior and growth of post-larval Haliotis diversicolor with initial shell lengths (SL) of approximately 500 μm (Exp. 1-1 and 1-2), 800 μm (Exp. 2), and 1200 μm (Exp. 3) were studied in a laboratory setting while they fed on four species of benthic diatom Achnanthes longipes , Cocconeis sublittoralis , Cylindrotheca closterium , and Navicula ramosissima . Exp. 1-1 and 1-2 revealed no marked differences in post-larval growth rates (mean 24–39 μm SL/day) among the diatom species. However, marked differences in growth rates among the species were revealed in Exp. 2 and 3. Three species, A. longipes , Co. sublittoralis, and Cy. closterium , produced faster growth (Exp. 2 mean 29–51 μm/day, Exp. 3 mean 36–44 μm/day) than N. ramosissima (Exp. 2 mean 18 μm/day, Exp. 3 mean 23 μm/day). Post-larvae fed N. ramosissima had lower digestion efficiency (42.8%) than those fed other diatom species (90.7–100%). Diatom extracellular substances appeared to be principally used from post-settlement to 800 μm SL, and diatom cell contents were required to produce rapid growth of larger post-larvae (>800 μm SL). It is likely that the availability of each diatom for post-larvae was affected by diatom morphology, attachment strength, frustule strength, and post-larval size. 相似文献