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Final Report of catfish farming techniques

6. For many juveniles began,[link widoczny dla zalogowanych], the purpose to the bait, it is necessary to promote its growth, the second is to learn to feed and feeding. Artificial feeding method is usually spread bait to the fish while feeding conditions observed while feeding, spreading evenly to vote, not to bait sink to the bottom, as far as possible taken to ensure equality of the fish bait opportunities. Feed opening size is 0.2mm, the future growth as juveniles, the increase of mouth, feeding size of 0.4mm, 0.6mm, 0.8mm feed. Use of bait fish size and caliber to adapt generally smaller size of bait used. Breeding process, we need to observe the size of the fish, according to the palatability of food, feed and timely replacement of large size, otherwise the losses will increase the feed rate. 3.4 The daily management of the fish pond management is essential to daily operations, the main outlet is the timely removal of garbage injection to ensure the water flow. Periodically remove the bottom of the bait, fish manure, reducing the breeding of pathogens. Time measurement of the growth of fish, according to the size of the fish screening, sub-support, and replacement of large particle diets to determine feeding rate. To observe the fish feeding and swimming, and find the disease and timely treatment. Technical Summary Report Xiaoyan catfish farming (Aquaculture Technology Extension Station of Heilongjiang Longjiang Longjiang 161lOO fishes catfish are scales, when the mature third instar spawning, breeding of 5.6 months, the egg is sinking, yellow, like the production quality of the gravel in the bottom zone. has a natural anti-enemy function, and its dorsal and pectoral fins are hard bone, serrated. catfish from the spring (late May) broke the egg membrane at the end of October, the body length from 1cm long adult fish to 20cm into the economy, price of 20 yuan per jin,[link widoczny dla zalogowanych], and the rare mandarin fish at 10 Heilongjiang Fisheries No. 5, 2008 cells,[link widoczny dla zalogowanych], is a saving food, land, energy-efficient varieties of artificial breeding in the county , summed up the following technical points. a continuous expansion of the water because of drought in recent years, Longjiang County, resulting in a large surface area decreased, therefore, we must first breeding water area expanded to a normal year, making good catfish waters in wintering area in the growth and security. 2 where water depth is now the dragon card arena is basically an average depth of the lake fisheries to achieve the catfish growth, reproduction, wintering requirements. The urn Springs Reservoir is due to the drought, the water level dropped severely, close to the dead storage . in accordance with the requirements of aquaculture technology to ensure the average water depth of two, first the two water dam heightening the height and width of the reinforcement to enhance water, drainage, so water can be introduced into the arena and the urn Springs Reservoir dragon. In addition , appropriate dredging in the spring to increase the water depth. 3 dragon arena and urns mediation spring water reservoir of declining water quality caused by successive years of drought, PH values have increased, such as the PH value is 7.8 Long lakes. Although such water catfish can survive, but the water zooplankton shell hardens, catfish decline in the quality of food, making catfish slow down digestion and absorption and affect the growth rate of catfish. So to take technical measures to discharge the part of the original ponds, the introduction of new water to solve this problem. In addition, they often observe, test arena and the urn long spring water reservoir, so Huangsang good water quality will always survive. 4 degree of improvement in water quality fat eating carnivorous catfish bait Juveniles eat zooplankton stage, after eating aquatic insects, small fish, if the water quality of thin, lack of aquatic animals, it will affect catfish growth and development, will delay sexual maturity, therefore, fertilization of these two breeding surface water quality is very important. technical measures to solve this problem is the water quality test results by, for delivery from time to time and more nutrients, high, full of mineral fertilizers and humus fertilizer. salmonids About Zhangyu Yong white eggs counting method Qing Li (China Academy of Fishery Sciences, Harbin 150070 Heilongjiang Fishery Research Institute) is an international fisheries salmonids high-grade aquatic products on the market is worldwide one of the most important breeding target. China has a vast, with many suitable for carrying out farmed salmonids in natural resources, and also has a rich quality of salmonids resources, such as taimen gorbuscha,[link widoczny dla zalogowanych], grayling and other fish and Heilongjiang. With the continuous improvement of living standards, for quality increasing consumer demand for fish, farmed salmonids has been rapid development, and achieved good economic results. now in the Northeast and Inner Mongolia, Gansu, Xinjiang, Shandong, Shanxi, Fujian, Sichuan, Yunnan, salmon Section fish culture to flourish. However, due to the natural environment and technological conditions, with a reproduction of salmonids small farming units, coupled with the process of practice in the production of different social division of labor,[link widoczny dla zalogowanych], making farming units and salmonids frequent among nursery units eyed eggs (salmonids embryonic development stage, and this was the best stages of the eggs transport) of buying and selling, the buyers and sellers to 11