Freshwater fish breeding
Choose high quality fish species
Fish species are the primary material basis for fish farming, and stocking high-quality fish species is an important condition for achieving high yields. High-quality fish species must meet the following requirements: Good shape: bright and shiny body color, scales, fins intact, no damage, no disease. Good physical condition: the back is wide and thick, the muscles are plump and flexible, swimming is lively and the water is strong. In an intensive environment, the head swings downward and the tail swings upward. The specifications are the same: the same batch of fish species are tidy and uniform in size. Those who do not meet the above conditions are regarded as poor quality fish species.
Master the timing of stocking
Generally, the best time for freshwater fish rearing fish species is from the winter solstice to the beginning of spring (from late December to early February). This is because the water temperature in winter is low, the fish's activity is weak, and the scales are tight. During fishing, transportation, and stocking operations, the fish body is not prone to mechanical trauma, and in particular, the infection rate of erythrodermic disease and watery mildew can be reduced. During this time, the metabolism of the fish has slowed down and it is not prone to hypoxia. In winter, stocked fingerlings are essentially stocked in advance, allowing the fish species to adapt to a new living environment for a longer period of time, ie extending the growth period. When the water temperature exceeds 10°C, the carps begin to ingest food and grow, so that they can make full use of the natural feeds of the water body to make up for the energy consumption during the winter and restore the normal physique before the prosperous period.
In situ selection of fish species for stocking ponds should be based on local
In production, it is advisable for the fish farms (households) to cultivate large-scale fish species on their own. As a result, production can be planned to meet the needs of stocking; secondly, long-distance transportation can prevent damage and death of fingerlings and increase the survival rate of fingerlings.
Restocking considerations
When you put fish in winter, you must choose a windless, warm sunny day. Do not operate in windy, rainy or snowy weather to avoid frostbite and bleeding. The fish container is required to be smooth, and the fish should be moved lightly when it is under the pond. Thoroughly immerse the barrels (pots) containing the fish in the pond water so that the fish can swim into the fish ponds themselves to avoid injury to the fish. The fish species must be sterilized with a drug solution in front of the pond to kill the surface parasites. Grass carp species also need to be vaccinated against disease.
The production and quality of enzyme preparations produced by plants are unstable due to the influence of growth area, season, climate, etc. The enzymes produced by animals are mainly extracted from the glands of slaughtered livestock, and the source is limited; only enzymes produced by microorganisms can meet the needs of any scale, with high yield and stable quality. Microbial enzyme preparations can not only replace the main types of animal and plant enzyme preparations with the same performance, but also produce high-temperature-amylases that act as catalysts at 100°C and detergent proteases that act at pH 10-12. In the 1940s, the microbial enzyme preparation industry developed rapidly. At present, the production of enzyme preparations is mainly based on deep fermentation, supplemented by semi-solid fermentation, and the ability of the strains to produce enzymes has also been greatly improved. The immobilized enzyme and immobilized cell technology developed in the 1960s and 1970s enabled the enzyme to be used repeatedly and continuously reacted, and its scope of application was also expanded. At present, in addition to the food and textile industries, microbial enzyme preparations are also used in daily chemistry, chemicals, pharmaceuticals, feed, papermaking, building materials, biochemistry, clinical analysis and other aspects, becoming an important sector of the fermentation industry.
Nutritional Supplement,Super Food,Superfood Powder,Green Superfood Ferment Asphali,Enzyme Asphali,Yeast Asphali
PYSON Co. ,Ltd. , https://www.pysonbio.com