The ecological habits of sea bream and rainbow rai

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Rainbow ecological habits and feeding bream

Class food; juvenile stages of eating artificial diet, the provision of organic debris,[link widoczny dla zalogowanych], algal and rotifer; into the main stage of the fish feed and ensure that local workers have broken clear and artificial food to feed farmed mainly as appropriate: : ① temperature: cold bream Rainbow ability, when the water for more stability in the I4 ℃ can be a normal feeding, the growth optimum temperature is 20 ~ 30 ℃, lethal temperature Kan is 38 '~ C or so. ② DO: When the dissolved oxygen in water decreased from 1.0 to 1.2 mg / l,[link widoczny dla zalogowanych], the fish does not show the state, the general water bodies DO 2 mg / upgraded security barrier zone, 1 to 2 mg / l as sensitive area, 1 mg / L under the suffocating zone. ③ pH value: pH values of the rainbow sea bream adapted to the wide range of saddle, the pH was 5.3-6 l of the pond may be, can normal growth and development and maturation of eggs. @ Salt: sea bream is a euryhaline rainbow fish, salt tolerance at least up to 35 ‰, the range of optimal growth salinity 5 ‰ ~ 10 ‰; It is reported that the growth of the rainbow brackish water tilapia than its nutritional value Individual growth in fresh water, and as salinity increases, the volume Rainbow cobia muscle protein also increased, therefore, suitable Xenocypris rainbow sea water and fresh water, and semi feeding. 2 breeding habits Xenocypris rainbow fish are spawning several times a year, and there to create spawning beds and to protect the eggs of the habit. The spawning temperature for 22 ~ 3O ℃, as long as the water right alliance, the Department may be breeding seasons. Generally the case appropriate tank, broodstock with a good group of mature after 15 days could emerge, with groups in proportion to the 1:3 or 1:4 is appropriate broodstock before spawning ponds often create a circle around the middle egg beds, the size of the diameter of 0.5 ~ I meters. Rainbow snapper have to protect the eggs the female habit of hatching eggs in the females mouth, emergence time for the l3 ~ 2O days, generally the higher the temperature, the shorter emergence time. Yellow capsule in the Mao period of time before disappearing from the female Sexual Abuse, after the disappearance of the yolk sac fry rainbow cicada feeding fish can have swallowed with the feces, which must be synchronized to withdraw breeding, so fish out of a tidy, to prevent similar phase residues reduced germination rate, affecting fish production. 3. A rainbow of breeding when the water temperature stable at 20 ℃ or so to start the outdoor cultivation. Fish ponds before Xiatang lime and other drug use clear pond disinfection (conventional breeding methods and the same species), well with the chicken manure fertilizer to cultivate zooplankton, the lack of fish quickly students}. 1O days of training around fish fed artificial feed, fish feed,[link widoczny dla zalogowanych], the crude protein content of preferably about 40%. When the fish cultivation to 40 ~ 6O per kg when the end to begin commercial fish farming. In general, rainbow cicada time by about 6 Satsuki feeding, can reach market size for commercial fish farming generally fall as well as raise the rainbow http bulimia, and snatch the less, it should not eat of the fish and other ability class, especially snatch fish polyculture with Lou. If polyculture, the best and shrimp, crabs and filter-feeding fish such as gray shoes, but can not cover fish and l) and other polyculture, which can make full use of ponds and organic food residue remaining debris to improve water quality fork . In addition, close support for the Rainbow bream, generally from 2500 to 3500 per acre is about stocking merchandise during the artificial breeding of fish with the crude protein content should be around 30%,[link widoczny dla zalogowanych], feeding fish size should be based on the size of different proportions feeding, the general weight of juvenile period of 8% to 10%, fish weight of 5% to a 7% weight of adult fish stage then 3% to 5% fed, a daily dose of 4 to 6 times voted must be careful when feeding, when the rainbow snapper eat fast food while on the walk, stop for a while but then they can eat, so feeding time ~ there must be patience, the general master each feeding time is appropriate in 3O minutes . 4. Daily management f1) fish disease prevention and control: Rainbow Saddle bream is a strong force against limp fish,[link widoczny dla zalogowanych], in addition to the individual in the winter season occurred Shuimei Bing, but basically no other diseases tritium line, so long as pay more attention to water quality, frequently changes the water to increase the transparency of the water so that it can live in fresh water, generally do not need drugs against Hao. Also, regular use of high-temperature season, lime, bleach disinfection will be effective in preventing fish disease. (2) timely fishing: when the water temperature below 13 ℃ below the long-term, Rainbow will be dead bream, so fishing should be arranged in Io the first time earlier this month before the cold air in order to avoid the loss to (3) winter: ① winter fish a good idea to dip into the pool look, the fish disinfection. ② winter water temperature should be maintained at 16 '~ C above, the general control of 18 ~ 20 ℃, such as the drainage into the convenient pool insulation, water retention is good, smoke pollution convenience, the water I'm coming up to 25' ~ C or so, so that the fish growth rate accelerated. ③ winter feeding of fish on the amount of body weight attributable to the 2% to 3%. Fisheries Research Institute, Beijing, Yuan Ding Lu Hongyan Chen Yuqin Zip code 100075