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Some Breeding Patterns of Aphrodisiac Red Fish White (I)
Since the beginning of the 70th century in the 20th century, China has studied aphrodisiac as a harmful and ferocious fish, mainly studying how to limit its population development in reservoirs. The fish live in the upper and middle layers of the water body, and the wild fish and white fish mainly depend on meat and food. In recent years, the research of Zhejiang Institute of Freshwater Fisheries has proved that Aphrodisiac can completely eat artificial compound feed. The biological characteristics of Aphrodisiac The habits of Aphrodisiac are fishes that live in large bodies of water such as lakes, reservoirs, and outboards. Adult fish are generally active in the upper waters of open water areas, swimming quickly, sexual violence, and good jumps; juvenile fish live in shallow water areas with relatively slow water flow. 2. The external appearance of the mouth is superior, the mandible is thick and upturned; the hypopharyngeal tooth is slightly curved at the top, the slender and slender, the zygomatic 3 chamber, the middle chamber is large; there is a ventral rib from the pelvic basal to the anus, and the dorsal fin stings are thick; The upper part of the body is gray and its abdomen is silver-white; it is long and flat. 3. Eating habits (1) The frequency of feeding is high, and feeding during the cold winter and reproductive periods is as usual. (2) Feed mainly on fish. The food is very selective. It is mostly small and medium sized fish, such as pheasants, cockroaches and fishes. (3) As the individual grows up, appetite changes significantly; small individuals mainly feed on algae, aquatic insects, etc., and those with a body length of 24 cm or more use fish as the main bait. Artificially bred under artificial conditions can feed fish gizzards, as well as chilled fish and artificial feed. 4. Reproductive characteristics Aphrodisiac red fish white has obvious upstream spawning habits. In mid-May each year, it gradually enters the sexual maturity stage, from mid-June to mid-July (10 days after the Lunar New Year's Breeding to 10 days after the small-summer heat). It is the peak of reproduction and it ends in early August. Males 2 are sexually mature in winter, 3 are mature in winter, and 2 are rare in winter. The number of females receiving eggs is 150,000 to 200,000 tablets/kg. 5. It grows rapidly and has a large body size. It can grow up to 10-15 kilograms and 0.5-1.5 kilograms for common individuals. Under normal circumstances, the length of the head of the fish is the fastest in the first year, followed by the second year. From the third year, the annual growth of body length has gradually declined. Under artificial conditions, after 8 to 10 months of feeding, 70% of seedlings of 7 cm can grow into commercial fish of 0.5 kg or more. 1st and 2nd instar fishes are in a vigorous growth period, and over 3 years old are in a slow growth period. After sexual maturation of females, the growth rate did not decrease significantly, and females grew faster than males. 6. Age In general, the age of the white mullet can be identified with scales. Natural aphrodisiac red fish white age can reach 9 instar. The relationship between the age, body length, and body weight of Aphrodisiac is quite complex, but the body length of Aphrodisiac is directly proportional to the diameter of the flake. Aphrodisiac breeding artificial breeding 1. Collect artificially hatched eggs of the red-mouthed white diarrhea fish. If it is difficult to harvest and breed the broiled white broilers of the red-mouthed mullet, the places where conditions permit can take into account the spawning grounds of the white mullet, and artificially place some young roots. Brown handle, etc., to collect the white mouth fertilized egg. 2. Breeding of the artificially-breeding Aphrodisiac broached white crouching fish, Aphrodisiac, red-fish, white-fish, generally occurs in upper and lower layers of water in open water areas, swimming rapidly, sexual violence, and good jumping, so general gill-net fishing is not suitable for broodstock, and less Some fishing rods are suitable for broodstock fishing. Aphrodisiac is best transported by nylon bag with oxygen, one end/one bag. 3. After the breeding of spare broodstock can be used immature Aphrodisiac white fish breeding 2 to 3 years later do broodstock. The appropriate stocking density is about 200 kg per mu. A small amount of 0.25 kg of squid was stocked to help regulate water quality. It is best to feed live feed fish or mixed feed such as fish paste and fish meal cocoon. The feeding amount is 1 to 7% of the fish's body weight. According to the water temperature and the broodstock feeding situation, it can be controlled flexibly. Fresh spring water is injected into the river 2 or 3 times a week after the spring, and an aerator is set to increase oxygen every day to keep the water high in dissolved oxygen. At the beginning of the year, individual body weights of broodstock reached an average of 0.6-0.8 kg, and a few reached more than 2 kg. The vast majority of fish have matured gonads. 4. Identification of female and male fish and selection of mature broodstock The general principle is to select large, robust and non-injured female and male fish for oxytocin use. Sexually mature males have a rough feel on the head and body surface. The abdomen does not inflate and is lightly pressured with milky white semen; sexually mature females have smooth head and body hand touches, and the abdomen expands and softens, the outline of the ovary on both sides is clear, and the reproductive hole is reddish. 5. Artificial oxytocin production can be carried out at home fish breeding facilities. Urge water for fresh river water. Inducing drug use pituitary, DOM, LRH-A and HCG. Use 1 injection. 6. Embryonic development Observed fertilized eggs due to the thickness of the membrane, it is usually difficult to observe the embryonic development. After impregnating the embryo with a certain concentration of trypsin, the egg membrane gradually becomes soft and thin until the membrane is easily peeled off. In this way, the development of the embryo can be clearly observed. 7. Results and summary (1) Broodstock was intensively cultivated until late April each year. Female and male fish were examined and both were found to be mature. Many subsequent manual elicitings were successful. A total of 80 million fry were produced in five years. This shows that Aphrodisiac can be adapted to grow in the fish ponds in Zhejiang Province and the gonadal development and maturation. (2) Pond rearing mouth red fish white minimum sexual maturity age Female and male fish are 2 winters old, large individuals (0.8 kg or more) can be selected for initial artificial oxytocin production. The water temperature for oxytocin production ranges from 20 to 30°C, and the suitable water temperature for oxytocin production ranges from 26 to 27°C. (3) The use of DOM+LRH-A mixed oxytocin has good results. The oxytocin effect has a close relationship with water temperature. Within a certain water temperature range, the higher the water temperature, the shorter the effect time; the lower the water temperature, the longer the effect time. Culturing of red-fish white fishes in the summer To develop artificial breeding of red-fish white fish, the Zhejiang Institute of Freshwater Fisheries carried out the cultivation of artificial feeds for the cultivation of white-summer flowers of the red snapper and the winter-finish fish species. And other tests. The following is a summary of the experiments on the cultivation of summer fish species of the fish as follows: Fry source. The fish fry cultivated by the summer fry were cultivated in the pond for 2 years, and the wild species of the red-white fish were cultivated as mature broodstock that can be inactivated by production, fertilization and hatching. 2. Breed ponds. The ponds for summer flower species breeding trials are common fish ponds with an area of ​​1~7 mu and a water depth of 1.0~1.2 meters. The test ponds were sterilized with lime liquor ponds in the week prior to stocking and breeding. , cultivate the test pond water, transparency 20 ~ 50cm. 3. Water source. Swirling water, fresh water, rich oxygen, no pollution. Incubation pond water is filtered with a 70-mesh sieve bag. 4. Fry stocking. The fry stocks of the summer flower species breeding test ponds were stocked on the 3rd day after the hatching of the fertilized eggs. Summer fish species breeding ponds have a stocking density of 20 to 100,000 tails/mu. The stocking summer flower density of fish breeding ponds is 1.5-0.8 thousand tails/mu. 5. feed. Summer fish species breeding feed mainly includes soybean milk and fish meal, silkworm cocoon powder, soybean meal powder, and No. 4 flour, etc. Powdered feed can be used for rearing fingerlings. 6. management. The “fat water†pond method was used, and new water was added at appropriate times. The pond water level gradually increased with the increase of the cultivation time and the growth of the fish body. Summer fish species breeding base fertilizer - soybean milk - powder feed. The late fingerling cultivation can be formulated with feed to supplement the deficiency of natural food. It is fed 3 times a day until the summer flowers and fish species come out of the pond. Before the summer flowers and fish species come out of the pond, they must undergo 2 or 3 pull-net exercises. Aphrodisiac white larvae live transport due to the late breeding season of Aphrodisiac red fish white (from June to July, the peak appears from late June to mid-July), and the seeds are supplied in June, July and August. A season is generally in the highest temperature stage, especially fry, the difficulty of transportation of fish species, low survival rate, long-distance transport, greater risk, often causing serious economic losses; Aphrodisiac white transport technology has become Aphrodisiac Industrialization is an important guarantee. 1. The main points of the transport technology of fry The white fingerlings of the fingerlings are those of the artificially propagated red salamander (normally the head of the red salamander is 4 to 5 days after puerpera). (1) The time of the fry of the red-fish-white fry is much smaller than that of the common freshwater fry, especially delicate, with little yolk and fast growth. Therefore, the fry of the red-fish white fry should be transported. Time is slightly ahead of time, depending on the length of transportation time. If the transportation time is longer than 15 hours, then the fry can be raised and transported, that is, the transport seedlings should be tender; if the fry points are already out, the transport time is the most It is better not to exceed 4 hours, that is, under the pond seedlings should not be too old. (2) Aphrodisiac redfish White fish seedlings Bagging density Apical mouth Red fish White fish fry Bagging The entire operation must be carried out with water. The method of transporting the fish of the red-and-white fish is generally 303040cm with a nylon bag. Each bag can hold 3 to 80,000 tails. The water temperature is 23~25°C. The transportation time can be 15 to 24 hours, and the survival rate is very high. (3) Mosquito-fish-white fry transport Special attention to several points Alice's beetle Red-fish-white-fry-frying After arranging time and density, pay special attention to: First, the nylon bag water is not mixed with aquatic organisms, especially aquatic animals, followed by requirements. The fry transport process, to avoid strong vibration bumps, and finally to prevent the water temperature changes too fast. 2. Main points of the transportation technology of summer flowers (1) The fishing time of the red-mouthed whitefish and white summer flowers is generally 2cm or more, and at least once before the summer flowers are transported. In practice, the fishing time for summer flowers is usually in the morning or evening. The main consideration is to lower the water temperature during summer fishing. Summer heat, taking into account the floating head and low temperature of the fry in the morning, in order to catch the plane for air transport, you can catch the fry the evening before, put it in the seedling box flush, and ship to the next morning. (2) The density of the white-summer flowers of the Aphrodisiac redfish is to be sufficient for the summer flowering time. Short-distance transportation, summer flower flush time is generally more than 2 hours; long-distance transport, summer flower flush time can be 5 to 15 hours. Aphrodisiac whitefish fishing and packaging is generally better with water operations.