Snake bass, commonly known as boat-notch, belongs to the subfamily Catfish, genus Snake bass. Its individual is small, the body is slender, the body length is 7 to 8 times the body height, the meat content is high, the meat taste is delicious, and the amino acid content in the muscle is detected to account for 18.3%, of which the umami amino acid accounts for 8.4%, accounting for about 46% of the total amino acid content. It is a high-protein, high-quality umami economic fish. With the decline of wild resources, at present, the market price of snake bass is as high as 80 to 100 yuan / kg, so it is urgent to carry out artificial breeding and seed breeding of snake bass, on the one hand, to meet the needs of the market, on the other hand, it can also be multiplied and released to restore natural resources. The preliminary farming results are reported as follows:
Choose 1.3 acres of yellow mud bottom soil pond that originally raised loach, with a water depth of more than 1.2 meters, which can maintain micro-flowing water all year round. The pond water source is upstream reservoir water, pH of 7.0 to 7.5, dissolved oxygen of more than 5 mg / L.
Ponds are desilted before stocking, retaining a silt thickness of 10 cm, and after more than a month of drying ponds, and finally disinfection with quicklime 75 kg/mu to improve the bottom of the pond.
At present, there are no artificially bred snake catfish seeds on the market, and the free-range snake bass fry are mainly natural fish species caught from rivers and lakes. From February to April, a total of 70 kg of artificially caught snake bass fingerlings were stocked, with a total of more than 8,100 fish, with a size of 5 to 10 g/tail, with an average size of 8.6 g/tail. Naturally caught snake bass seeds have a strong stress response and more injuries, so try to select healthy snake bass seeds with water as much as possible. Transport water bodies with 50 mg/L stress VC for anti-stress treatment, oxygenated transport with nylon bags or oxygenated with smooth plastic boxes, and the transport time is less than 1 hour. Before going down to the pond, use 2% to 3% salt to disinfect and soak for 2 to 3 minutes, snake bass seeds like to gather in corners after transportation, slow response, therefore, when stocking, let the snake bass seeds swim into the pond naturally and slowly. Starting the day after stocking, continuous disinfection with glutaraldehyde and povidone iodine is used 2 to 3 times to prevent bacterial infection after seed injury.
Snake bass in the natural water body mainly feed aquatic insects, etc., feeding habits for animals partial omnivorous, artificial breeding must be domesticated to feed compound feed, considering the snake bass meat content is high, the total amount of amino acids than crucian carp, grass carp, snakehead, etc. are high, so the feeding of the compounding feed crude protein is 35% loach granular feed. The feed is domesticated before feeding, and when domesticated, it is first small and several times, and it is thrown along the side of the pool. And use the feed table to check the eating situation, 3 days later began to concentrate on the feed table feeding, generally about 5 days can see the snake bass on the feeding table. The normal feeding amount is 1% to 2%. According to the weather and feeding conditions, increase or decrease feeding appropriately.
Snake bass has higher requirements for dissolved oxygen, and uses a small amount of micro-water water every day to keep the water body alive, so that the dissolved oxygen of the water body is more than 5 mg / liter. The source of the flowing water is the upstream reservoir water, the maximum water temperature is not higher than 28 ° C, and the water quality is clear. Due to the weak algae phase of the early water body, the water body is easily turbid, which is not conducive to the growth of snake bass. Therefore, the early stage should reduce the flow of water, and use a small amount of biological fertilizer for fertilizer. In the middle and late stages of aquaculture, the amount of flowing water should be increased, and the daily flow of water should be maintained at 1% to 2%. Especially in the hot summer, the water temperature of the breeding pond is always below 30 °C.
At the same time of water transfer, in the breeding of snake bass from August to September, the pool bottom modifier is used every 15 days, and the commonly used bottom modifier is macrosole, potassium persulfide particles and bacillus-based biological bottom modification, which plays a role in oxidizing the mud sludge at the bottom of the pool and reducing the toxic substances such as ammonia nitrogen and nitrite at the bottom of the pool.
In the breeding process of snake bass, there are relatively few diseases, which may also be due to the death of snake bass and not floating, which is not easy to find. Therefore, in the breeding process is mainly to adjust the water quality, often throw the net to check the growth of snake bass, in the breeding process the main disease is rot disease. Occurs mainly in the early stages of stocking, but can be caused by fishing injuries, manifested by redness and swelling at the base of the dorsal fin, after which the area ulcerates and the diseased fish swim slowly along the edge of the pond. Severe occurrence of death. For the treatment of topical povidone iodine 0.3 mg / l + three yellow powder 0.3 mg / l for sprinkling, each kg of feed is added multi-dimensional 5 g + triple yellow powder 4 g, for 5 days.
Snake bass are benthic fish that prefer to flock but are less active. Fishing with ground cages is not very effective, but it can be started with a dragnet. 2 hours before harvesting, the whole pool of stress VC 1 mg/l is sprinkled with anti-stress, and then slowly pulled the net along the edge of the pool. After starting the net, it is necessary to quickly transfer it into the cage and move it to a place with clean water quality to prevent hypoxia. After harvesting, try to operate with water, the density of shipment should not be too large and pay attention to oxygenated transportation.
From the stocking in April to the dry pond fishing at the end of November, the breeding time was 8 months, and more than 3300 snakes and bass were caught, the survival rate was 40.7%, the average size was 22 g/tail, and the net weight gain was 1.56 times. Initial success was achieved.
Snake bass breeding is more difficult, after a cycle of breeding, there are mainly such a few experiences: (1) snake bass on the weak ability to resist stress, after catching the net, the stress response is strong, sometimes the fish is caught in the hand, you can obviously see the fish body appears violent spasm phenomenon, the fish body will soon become hard; (2) snake bass onset and death after the onset of illness and death is rarely floating, the breeding test process has never seen the phenomenon of dead fish, but the final breeding survival rate is not high, it is estimated that the mortality rate in the early stage of stocking is very high; (3) snake bass has higher requirements for dissolved oxygen, In the process of breeding, a small number of fish species are placed in the bucket containing clean water bodies, and in about 10 minutes, the fish body will appear to lie on its side, turn over the belly phenomenon, and the fish species that have lacked oxygen have a very high mortality rate; (4) the fishing method of snake bass still needs to be explored, the effect of the snake bass cage is not good, but the mortality rate after pulling the net dry pond is also high, and the last catch of this breeding is more than 300 dead fish, accounting for 10% of the loss, fortunately, the snake bass is mainly sold fresh, and has reached the commodity specifications, which does not affect the sales price; (5) The snake bass feeding process, It is found that the domestication of snake bass is still relatively convenient, 35% of the feed protein level can basically meet the growth needs of snake bass; (6) although the wild snake catfish seed is stressful, the water quality requirements are also high, and the pond we breed is yellow mud pond bottom, the water color is yellow all year round, the pH is maintained at 7.2 to 7.8, the dissolved oxygen is maintained at 3 to 8 mg / liter, due to the low stocking density, the micro-flowing water is maintained all year round, the pond does not use an aerator, from the perspective of breeding effect, it can basically meet the breeding requirements of snake catfish ;(7) Snake bass is a benthic fish in rivers and lakes, although the individual is small, but the nutritional value and meat content is high, the meat taste is delicious, it is welcomed by the farmhouse wild fish taste hall, it is a characteristic high-quality economic fish, and the artificial breeding of snake bass will have good prospects for development.