共查询到20条相似文献,搜索用时 15 毫秒
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Colin E. Nash 《Aquaculture (Amsterdam, Netherlands)》1984,37(2):183-184
Oxygen consumption and ammonia production in elvers of varying growth rates were studied. The allometric equation describing the relationship between oxygen consumption and weight is y =00.638 x0,525, where y is the oxygen consumption (mg/h) and x is the mass (g). The weight specific allometric equation for the relationship between ammonia excretion and weight is . Slow growing elvers were found to have higher respiratory rates (0.737 mg O2 h?1 g?1) than would be expected for their size. 相似文献
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T. J. Lam 《Aquaculture (Amsterdam, Netherlands)》1980,20(4):389-390
Existing open plankton pond techniques employed in Australian warm-water fish culture are outlined. The development of the covered plankton pond is traced and details of materials used, management and production over an 18-month period provided. The advantages of covered ponds, improved design features for further work and the significance of techniques develeped are briefly discussed. 相似文献
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Jakob Gjøsæter 《Fisheries Research》1984,2(4):315-316
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P.G. Allen 《Aquaculture (Amsterdam, Netherlands)》1984,37(3):283-285
Propeller-aspirator-pump aerators of 0.38, 1.5, and 2.24 kW transferred averages of 1.73 to 1.91 kg oxygen/kW · h in standardized oxygen transfer tests (tap water; 20°C; 0 mg/l dissolved oxygen) conducted in a shallow basin (1.04 m of water depth). In comparison tests, spray-type surface aerators transferred 1.34 to 1.41 kg oxygen/kW · h and a diffused-air system transferred 1.08 kW · h. The water-mixing capabilities of aerators were estimated from the time to completely mix salt (NaCl) throughout the volumes of ponds, and from the time required to spread a dye over surfaces of ponds. The propeller-aspirator-pump was effective in mixing pond water. A 1.5-kW propeller-aspirator-pump spread dye over a 0.4-ha pond in 32 min and mixed salt throughout 3000 m3 of water in 90 min. A larger spray-type surface aerator (2.24 kW) required 1.5 h to spread dye and 1.75 h to mix salt in the same pond. 相似文献
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P. Van Banning 《Aquaculture (Amsterdam, Netherlands)》1984,40(4):371-372
A surgical technique for extracting ovary samples from bullfrogs without altering ovarian development is described. 相似文献
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N.P. Wilkins 《Aquaculture (Amsterdam, Netherlands)》1984,40(1):95-96
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P. van Banning 《Aquaculture (Amsterdam, Netherlands)》1984,37(3):287