共查询到18条相似文献，搜索用时 390 毫秒
1.
在实验车间内利用120L的塑料箱作为实验容器,采用自溶面包酵母(Saccharomyces cerevisiae)作为单细胞藻的辅助饵料,研究其在马氏珠母贝(Pinctada martensii Dunker)育苗中的饵料效果,以期解决该贝育苗过程饵料供应不稳定、易培饵料品种小球藻(Chlorella sp.)利用率低的问题。研究结果表明:(1)在温度(30.0±0.5)℃、NaCl质量分数3%、pH6.5～7.0的自溶条件下,用经过18h自溶的酵母投喂D形幼虫,其平均日壳长增长率显著高于其他自溶时间酵母投喂组效果,单独投喂非自溶酵母时D形幼虫不能存活;(2)D形幼虫期单投自溶酵母,幼虫成活率与金藻组没有显著差异(P>0.05),生长速度比金藻组提高8%(P<0.05),说明自溶酵母可以完全替代湛江等鞭金藻(Isochrysis zhanjiangensis Hu﹠Liu),但在壳顶幼虫期和稚贝期单投自溶酵母不能使幼虫和稚贝正常发育和存活;(3)壳顶幼虫期及眼点幼虫至稚贝期投喂"自溶酵母 小球藻(Chlorella sp.)"或"自溶酵母 扁藻[Platymonas subcordiformis(Wille)]",其生长速度及存活率或稚贝育成率均显著高于单投扁藻或小球藻(P<0.05),单投小球藻的饵料效果最差;(4)自溶酵母与小球藻混投对眼点幼虫至稚贝培育效果较单独投喂影响显著,可显著(P<0.05)提高稚贝的育成率、生长速度和耐干露能力。研究表明,使用自溶酵母可以优化马氏珠母贝健康苗种规模繁育中的饵料供应工艺及提高易培饵料品种小球藻的利用价值,从而提高该贝育苗效果。 相似文献
2.
3.
尖紫蛤壳顶幼虫适宜饵料的研究 总被引：1，自引：0，他引：1
为了研究尖紫蛤壳顶幼虫适宜饵料种类和投喂浓度,选用5组微藻做为饵料,研究其对尖紫蛤(Soletellina acuta Cai et Zhuang)壳顶幼虫生长和存活的影响。5组微藻分别是A组微绿球藻(Nannochloropsis oculata sp.),B组亚心形扁藻(Platymonas subcordiformi),C组湛江等鞭金藻(Isochrysis zhanjiangensis)+亚心形扁藻,D组绿色巴夫藻(Pavlova viridis)+亚心形扁藻,E组小球藻(Chlorella sp.)+亚心形扁藻。单因素方差分析表明:A组饵料效果为最好;B组和C组的饵料效果次之,E组和D组的饵料效果较差;不同饵料种类下,A组壳顶幼虫有最大生长和存活率;不同饵料浓度下,A组的最适投喂浓度是12 000个/(mL.d),C组的最适投喂浓度是5 000+5 000个/(mL.d)。A组和C组获得了较高的生长速率和成活率,可做为尖紫蛤壳顶幼虫适宜的饵料。 相似文献
4.
5.
6.
珠母贝浮游幼虫饵料的研究 总被引：2，自引：0，他引：2
研究了湛江等鞭金藻、等鞭金藻OA-3011、亚心形扁藻、小球藻、绿色巴夫藻、面包酵母、光合细菌单独及多种混合投喂对珠母贝浮游幼虫生长、存活和变态的影响.结果表明:单独投喂时湛江等鞭金藻、等鞭金藻OA-3011效果最好,幼虫壳长93 μm时可投喂亚心形扁藻,小球藻、绿色巴夫藻、面包酵母、光合细菌不宜单独投喂;直线铰合期、壳顶幼虫的最适日投饵量扁藻为2 400cell/mL和5 000 cell/mL,湛江等鞭金藻为3 000 cell/mL和5 500 cell/mL,光合细菌为10 000 cell/mL和15 000cell/mL湛江等鞭金藻、亚心形扁藻、光合细菌和绿色巴夫藻混合投喂对浮游幼虫生长、存活和变态有显著提高,出现壳初、眼点、附着和变态时间显著缩短. 相似文献
7.
正近年来,随着厚壳贻贝养殖规模扩大,厚壳贻贝人工育苗也迅速发展起来。但育苗技术一直没有很好解决,导致育苗数量不稳定,苗种供应不足。本文根据笔者近几年的生产实践经验,对厚壳贻贝的苗种培育过程中关键技术进行总结,以求对今后厚壳贻贝育苗生产有所帮助。一、壳顶幼虫培育壳顶幼虫培育是厚壳贻贝人工育苗过程中的一个重要环节,它决定了苗种生产出苗率高低以及出苗数量。壳顶幼虫培育期间,要做到合理投喂饵料,逐步加大换水量,及时进行疏苗,轮流投洒抗生素,还要勤在显微镜下观察幼体生长发育、活力以及肠胃饱 相似文献
8.
9.
10.
本文主要对岐脊加夫蛤幼虫培育的适宜密度进行初步探讨，以壳长为１６０．３μｍ的壳顶幼虫进行实验，历时８天。实验结果表明：在水温２７－２９℃，比重１．０２０－１．０２２的条件下投以等量的异胶藻和牟氏角毛藻的混合饵料，幼虫培育的适宜密度为５－１０个／ｍｌ。密度为２个／ｍｌ幼虫的生长速度快，但变态时存活率较低； 相似文献
11.
12.
13.
14.
本文叙述了在室内控制条件下，摄食底栖硅藻和几种浮游单细胞藻的菲律宾蛤仔稚贝的生长速度和存活率。结果表明，稚贝不论是摄食底栖硅藻还是摄食浮游单细胞藻都能正常生长，只是摄食不同种类的饵料生长速度不同而已，其中以摄食底栖硅藻和角毛藻、湛江叉鞭藻和角毛藻的混合投喂效果最佳。稚贝摄食这些饵料，不但生长快(分别为33．7微米／日和29．2微米／日)，而且存活率高(80％左右)。除要注意选择适宜的饵料种类外，饵料的投放密度也不可勿视。在稚贝的培养中，所投饵料的适宜密度应控制在2．5—5万个，毫升(混合饵料各一半)。本文还论述了底栖硅藻和冷冻扁藻混合投喂也能获得较满意结果，但比上述最佳的混合饵料的效果差。 相似文献
15.
经人工孵化的同亲本史氏鲟鱼苗,用水蚯蚓饲养20天后,直接转入水簇箱内（水体100×25×40cm）进行配合饲料饲养试验。试验设3个不同蛋白质梯度的配合饲料组（1号料、2号料、3号料）和一个投喂水蚯蚓的对照组,每组放鱼100尾,试验期为30天,30天后试验各组幼鲟体重分别为5．01g、4.74g、4.91g和4．08g。存活率分别为82％、86％、75％和95％。试验结果表明：用活饵喂养一段时间的史氏鲟幼鱼仍可直接采用配合饲料喂养,无需进行过渡驯饲,同时指出适合于幼鲟营养平衡的配合饲料仍需进一步改进与提高. 相似文献
16.
《Journal Of Applied Aquaculture》2013,25(3-4):189-220
This paper reviews state-of-the-art techniques for culture of larval common carp, Cyprinus carpio, silver carp, Hypophthalmichthys molitrix, bighead carp, H. nobilis, and grass carp, Crenopharyngodon idella. Water temperature, food, and predation are important factors influencing larval survival and growth. Lower and upper lethal temperatures range from 3 to 44°C. Optimum growth temperatures range from 38 to 40°C. Lethal and optimum temperatures vary with acclimation temperature, fish age, and development stage of fish. Water temperatures are close to optimum for larval culture in tropical regions but are often too low in temperate climates. Intensive culture in temperature-controlled systems is important in temperate climates. The first food eaten by larvae in ponds consists mainly of protozoa, rotifers, and copepod nauplii. As fhe larvae grow, they quickly shift to larger food items, including cladocera and insect larvae. Management practices to enhance natural food development in earthen ponds include bottom drying, soil preparation, liming, fertilization, and agricultural crop cultivation. The development of food organisms in freshly filled ponds follows a pattern of succession. For best results, a pond should be stocked at the stage of succession when the size relationship between fish larvae (predators) and zooplankton (prey) is proper. A common practice is to stock larvae 3-7 days after filling. If ponds are filled too long before larvae are stocked, food relationships between fish and invertebrates can be reversed. Predator control includes biological, chemical, physical, and mechanical methods. Although great progress has been made in the development of dry starter diets, prepared feeds are not yet available for successful large-scale production. This problem is usually overcome by starting larvae with live food or with a mixture of live food and dry feed and by shifting larvae to dry diets as they grow. Live food either is collected from zooplankton ponds or is produced in intensive culture conditions. Systems for larval culture can range from ponds to intensive culture with water recirculation systems. Choice of the best system depends on the local climate, technical, and socio-economic conditions. 相似文献
17.
Fedelia Flor C. Mero Fiona. L. Pedroso Mary Jane S. Apines-Amar Josel F. Cadangin Donna C. Rendaje Christine S. Verde Jean Rose H. Maquirang Lily Anne G. Pi&#;osa 《International Aquatic Research》2019,11(2):159-172
In an attempt to induce early spat settlement and improve mussel seed production, this study aims to determine the influence of water management, photoperiod, and aeration, on the growth, survival and settlement of green mussel (Perna viridis). Water in the pediveliger rearing tanks was changed every day, every 3 days and every 5 days for the water-management experiment. Pediveligers were exposed in 24L:0D h (light: dark), 12L:12D h and 0L:24D h conditions for the photoperiod experiment. Three aeration intensities were also tested—mild (10 L h−1), moderate (20 L h−1), and strong (30 L h−1). This study demonstrated that changing water every 3 days was effective in maintaining the rearing water quality and improving the growth and survival of P. viridis larvae. Highest growth and survival rates were observed in P. viridis spats grown in 0L:24D h photoperiod. There was no significant difference in the settlement rate of larvae exposed to different photoperiods. Mild aeration has shown to improve the growth of P. viridis larvae, but higher survival and settlement rates were attained in the strongly-aerated conditions. Therefore, when the larvae start to settle, it is recommended to expose them to darkness, change the water every 3 days and provide a strong aeration to be able to attain high survival and settlement rates, and bigger spats. 相似文献
18.
Yukinori Mukai Audrey Daning Tuzan Leong Seng Lim Syahirah Yahaya 《Fisheries Science》2010,76(3):457-461
Sutchi catfish Pangasianodon hypophthalmus hatch with morphologically immature sensory organs; however, sensory organs develop rapidly with larval growth. Two-day-old
larvae commenced ingesting Artemia nauplii. The larvae displayed many taste buds on the barbels, the head surface, and in the buccal cavity. Other sense organs
were also well developed at this stage. Feeding experiments revealed that 2-day-old larvae ingested Artemia under both light and dark conditions, moreover, the larvae could ingest frozen dead Artemia. The ingestion rates for 4- and 7-day-old larvae were significantly higher under dark conditions than under light conditions.
The rates using frozen dead Artemia were mostly higher than the rates using live Artemia. Therefore, feeding behavior under dark conditions is most likely not mediated by visual or mechanical senses, but rather
by chemosensory senses, such as taste buds. Larval fish are vulnerable to predators; thus, if they can search for and eat
food at night, they can avoid diurnal predators. The behavior observed here appears to represent their survival strategy.
Moreover, these results suggest a new possibility that sutchi catfish larvae can be reared under dark or dim light conditions
in order to improve survival and growth rates as in the case of African catfish Clarias gariepinus. 相似文献