Biological characteristics Obscure Oriental dolphins are commonly known as puffer fish, mainly distributed in the lower reaches of the Bohai Sea, East China Sea, Yellow Sea, and Tongjiang Rivers. They are inshore and river bottom fish. With genital warts. From March to May each year, sexually mature broodstocks breed in groups upstream to the middle of the Yangtze River. Young fish live in rivers or lakes in Tongjiang and return to the sea in the second spring. When the sea grows up to sexual maturity, it goes back to the river to lay eggs in fresh water. Obscure Oriental? Is a carnivorous omnivorous fish under natural conditions. The fish fry eat rotifers, cladocera, copepods, etc., young fish and adult fish mainly eat shrimp, crab, snail, fry, aquatic insects, etc. , also eat plant leaves and filamentous algae. Under artificial breeding conditions, the fry are fed rotifers, cladocerans, etc. After domestication, juvenile fish and adult fish can ingest artificial compound feeds, such as catfish and soft-shelled turtle feed. Currently, there is no specialized river-based compound feed. Therefore, The full price of the river is yet to be developed. Obscure Oriental? Usually 2-3 years of sexual maturity, female individuals larger than the male, a spawning type, 10-20 million fecundity. Pond culture technology 1. Fish species transportation and stocking In order to ensure the success of breeding, we should choose stocks of authentic dark-faced Oriental fish species with robust physique, no disease, no injury, neat specifications, and strong water-return. Transportation is generally transported by a plastic bag and oxygenated. The 4 to 6 cm long seedlings each contain 200 to 300 tails, can be transported for 5 to 8 hours, and the survival rate is above 95%. In the 7-8 days before stocking, use fresh lime, bleach, tea bran and Other clear ponds to disinfect. Before stocking, the seedlings should be sterilized with 3% to 4% saline for 10 to 20 minutes. When stocking, care should be taken to ensure that the temperature should not be too large. The stocking density should be 2000 to 3500 tails/mu, as the fish grows and gradually catches up. Small, dilute farming. 2. For feed feeding and water quality control, within one week of stocking, live fish, shrimp or chopped fish, shrimp, snail meat and other bait can be fed for domestication, gradually adapting to the farming environment and the composition of the bait. After eating habitually, gradually mix the artificial diet of squid or soft-shelled turtle in the bait, and transition to feeding the artificial compound feed. During the tame, we must ensure the freshness of the bait. We must also do it quantitatively, regularly, and regularly. Normally two times a day, once in the afternoon and one in the afternoon, a food table is set up beside the pond and fed at a fixed point. The daily feeding amount is 3% to 5% of the fish's body weight. The river should enjoy a fresh water environment. The best color of the river should be mung bean blue with a transparency of about 30 cm. Water or water should be added in time according to the pond’s water color, water quality, transparency, dissolved oxygen, and fish activity. Generally speaking, the amount of pool water exchange may be less in the early stage of cultivation. However, due to the accumulation of residual baits and feces in the summer and high temperature seasons, the decomposition rate is accelerated, and ammonia, nitrogen nitrite, hydrogen sulfide, and other harmful toxic substances cause the dissolved oxygen and pH to decrease. , directly affect the food intake of puffer fish, serious or even cause the disease, Pan pool dead fish, so in the middle and late culture to gradually increase the amount of water, in the high temperature period can be added in the next morning and early morning cooling water and increase oxygen. Because the optimum growth temperature range of the river is 9 to 32°C, when the water temperature exceeds 32°C in summer, it is necessary to inject new water or adopt cooling measures to adjust. In winter, when the water temperature is lower than 9°C, insulation and heating are required for overwintering. In addition, the river has higher requirements for dissolved oxygen. When the dissolved oxygen in the water is lower than 1-5 mg/L, it begins to float, and when it falls below 1-3 mg/L, it begins to die. The dissolved oxygen in the pool should be kept at 3 mg/L. the above. 3, aquaculture and management of the river should be careful and meticulous, perseverance, we must pay attention to each link. Specifically, we must do the following daily management tasks: (1) The patrol pond should observe the activities of the river, food intake, water color, and water quality every day, and check the aquaculture facilities. The physicochemical factors such as water temperature should be regularly measured every day. , pH, dissolved oxygen, ammonia nitrogen, transparency, etc., and make records. (2) Adjust feed volume in time Within the appropriate temperature range, rivers grow faster. With the increase of body weight, the total amount of daily feeding must be adjusted. Every 10 to 15 days, the weight of the pond should be measured, and the total weight of the river in the pond should be calculated. The feeding amount of the next stage should be adjusted accordingly. (3) Disease prevention and control of river fish? Usually there are no specific pests and diseases. Aquatic mildew disease, small melon worm disease, gill disease, and enteritis disease are the most common diseases in pond culture. In the production of prevention-based, every half or a month Quanchiposa disinfectant once, and regularly mix in the feed antibacterial drugs such as furazolidone, Coptis, astragalus, Cork, Banlangen, Andrographis and so on. Because the fish is particularly sensitive to the dose of anti-drugs and the treatment time, other fish commonly used doses must not be applied to avoid causing phytotoxicity. (4) Timely rearing and harvesting When the breeding density is too large or the individual differences are large and the food is insufficient, the river has a habit of biting and biting each other and eating each other. Therefore, according to the actual situation, we must catch large and small fish in time and divide it into ponds. In the domestic market, the product size of the river is more than 400 grams, and the stocks of the year of stocking are generally only grown to 150 to 250 grams. Most of them will be listed in the following year. Therefore, according to the needs of the market, they must be ready for sale. Improve breeding efficiency.
â– Remind the puffer fish to beware of poisoning The dark-skinned porcupine of the oriental porpoise is highly toxic, and the amount of the poison varies depending on the site and season. Under normal circumstances, male fish have lower toxins than females, and the ovaries and liver are highly toxic, followed by the kidneys, blood, eyes, sputum, etc. The skin, testis, and muscles are non-toxic. River toxin is a highly toxic neurotoxin and its toxicity is 1250 times stronger than that of sodium cyanide. Poisoning patients often suffocate under the deep respiratory palsy.
â– Remind the puffer fish to beware of poisoning The dark-skinned porcupine of the oriental porpoise is highly toxic, and the amount of the poison varies depending on the site and season. Under normal circumstances, male fish have lower toxins than females, and the ovaries and liver are highly toxic, followed by the kidneys, blood, eyes, sputum, etc. The skin, testis, and muscles are non-toxic. River toxin is a highly toxic neurotoxin and its toxicity is 1250 times stronger than that of sodium cyanide. Poisoning patients often suffocate under the deep respiratory palsy.
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