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Study on the Effect of PSB on the Evironmental Friendly Aquaculture of Paddlefish (Polyodon Spathula)

Author: CongBo
Tutor: XiaYanJie
School: Jilin Agricultural University
Course: Animal Genetic Breeding and Reproduction
Keywords: Paddlefish Healthy farming Photosynthetic bacteria Water quality control Compound feed
CLC: S917.1
Type: Master's thesis
Year: 2005
Downloads: 337
Quote: 0
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Abstract

The test for production test, in the Meihe total security seven fisheries pond reservoir seed health paddlefish species breeding and wintering aquatic breeding farm from the national level, within a year's breeding cycle, first purchased seed and in strict accordance with the requirements of healthy breeding in the pond, the water's choice; Secondly, photosynthetic bacteria in water quality control in the breeding process, and enhance fish immunity, provide a healthy aquatic environment for the growth of paddlefish fingerlings reach with the purpose of ecological methods to prevent and cure diseases; in aquacultural production process, as the main part of the natural food, auxiliary fed with artificial feed, breeding. After a year of farming, and achieved good results. The results show that: ① in the cold northern regions can paddlefish species nurturing adult fish feeding. Stocking density is appropriate, then the species completely by feeding natural food and supplementary feeding with artificial feed, to develop a commercial fish. Paddlefish farming point of view, when the pond waters abundant zooplankton can not spill photosynthetic bacteria; Conversely, spill photosynthetic bacteria is very necessary. Otherwise, the fish's growth will be severely affected, if necessary, fed artificial feed. Only in this way, the paddlefish can grow fast and large individual high yield. (2) in the breeding process, the use of photosynthetic bacteria pond water chemistry indicators - transparency, dissolved oxygen, ammonia nitrogen have a significant impact. The control ponds SD changes only within a smaller amplitude, and always maintain a relatively stable value. Put the photosynthetic bacteria trials pond put in photosynthetic bacteria, SD have different degrees of reduction to make to the development of fish farming reasonable trend. From four experimental pond overall point of view, the change trend is not particularly significant, this is because the effector phase of the photosynthetic bacteria itself is short, only within the validity period can be significantly play its regulate the water quality in its effective period after which only maintain the existing status of the water quality to a certain extent, does not change the overall trends of the water bodies SD, solid put in after the first nine days of the photosynthetic bacteria, the test ponds SD and gradually shift to the original trend; from four test pond of the overall situation, the Do values ??are generally high, and higher rate soon, this is mainly due to the result of photosynthetic bacteria. Photosynthetic bacteria to promote pond phytoplankton blooms, phytoplankton photosynthesis to produce oxygen content Do the pond waters increased rapidly; little change in ammonia nitrogen control pond No. 1, put photosynthetic bacteria in the test pond ammonia nitrogen there is a clear downward trend, the test group differences were not significant, but a significant difference between the test group and the control group. This is due to The photosynthetic bacterial nitrogen fixation and the use of low molecular weight organic compounds and hydrogen sulfide, can remove the bottom of the pool constantly produce ammonia nitrogen and organic matter, so as to maintain good water quality. ③ photosynthetic bacteria pond plankton biomass. Test group of four ponds spill photosynthetic bacteria microcystin clear downward trend, the 9th world spill photosynthetic bacteria down to a lower level, after stable at this level. Beneficial to the growth of fish green algae door and Euglenophyta, biomass increased photosynthetic bacteria can inhibit the growth of harmful algae and promote the breeding of beneficial algae. And control pool microcystin were processing new water filling, while splashed the downwind with lime in windy weather microcystin gathered, and therefore did not change significantly. The experimental group of four ponds difference was not significant, but significant differences between the test and control groups. Photosynthetic bacteria zooplankton

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