Big-eyed lionfish breeding technique

Big eyed lion's English name walley. Also known as the white-eyed oystercatcher, it belongs to the genus Ovaliformes, Acipenseridae, and Griffonidae. It is native to the eastern part of North America and is an important fishing and economic fish species in the United States and Canada. In Canada, its production accounted for the second place among freshwater fish, and its production value and benefits ranked first. This fish has more than 100 years of breeding history in the United States and Canada. In recent years, the Canadian government has established a number of seed breeding stations for large-scale artificial breeding, seed production, and artificial discharge, with the aim of supplementing natural resources and expanding the fishing industry.

In 1993 and 1994, Harbin Fisheries Research Institute of Heilongjiang Province introduced the big-eyed lion's eyebrows twice from Canada, raised fry in the house, and conducted fry, fingerling and adult fish breeding tests in outdoor ponds. The result was that the fry were cultivated for 35 days and the average body length reached 5.2 cm. The survival rate was as high as 75.8%. The fish species were raised and 100 to 150 tails of lion's owl were raised and cultivated for 3 months. The average body weight is between 50 g and 100 g. Adult fish cultured with 300 to 600 tails per hectare of water. After 5 months of feeding, the body weight ranges from 300 g to 475 g. The fish of 2 ages weighs 670 g to 1020 g. The average yield per hectare is between 75 and 150 kg.

The above experiments prove that the big-eyed lion's owl adapts to the climate conditions in northern China and grows well. It is a new breed with promising development.

First, biological characteristics

(1) Classification and distribution The bigeye lion is a genus of the genus Odonata, Acipenser, and Griffin. This fish originates from the eastern part of Canada and the western part of the western part of the country is connected to the triangular region of Alabama of the United States. It was later transferred to the United States except New Mexico and Florida.

(B) Morphological characteristics Big eye lions body slender, spindle-shaped; was fine scales; the body was blue and yellow, with black stripes, pale yellow abdomen; eyes large, eye length accounted for 16.1% to 26. head length. 7%; because it is white in the sun, it is also known as the white-eyed pimple; mouth-end position, the mouth split is larger; caudal fin is tail-type, deeper bifurcation; dorsal fin two, the first dorsal fin is hard spine, the first Second dorsal fin soft strip.

(c) The dietary big-eyed lion's owl is a carnivorous fish, and 3 cm to 5 cm juveniles feed on zooplankton. Individuals above 5 cm may eat zooplankton, chironomid larvae, aquatic insects, small fish, and shrimp. Frogs and moths, water frogs, and even mice. In the case of insufficient food, they can eat each other and eat small food.

(4) The adaptability of big eye gills has strong adaptability and the requirements for the environment are not very high. The temperature range for its survival is 0°C to 30°C, and the optimal water temperature for growth is 20°C to 23°C. Generally, it does not live in a water body above 27°C, and it prefers to live at a temperature between warm water fish and cold water fish. This fish is more adaptable to lower transparency, with a suitable transparency ranging from 10 cm to 20 cm. Hi like to live in phytoplankton with high concentration or turbid water, like to live in swamps with deeper shades. In different transparency of the water body, its distribution is different. In the clear lake, it is concentrated in the haze of the river inlet; in the less transparent water, it is concentrated in the water of slightly higher transparency. In terms of sediment quality, it will mostly avoid silt and choose relatively clean sediment, preferring to inhabit sand, pebbles or rocks. Suitable for running water conditions, areas where micro-flows to lakes, streams entering estuaries, narrow lakes and stormy areas have their clustered areas. Greater eye lions need more than 4 mg/l of dissolved oxygen, a median lethal concentration of 2 mg/l in laboratory tests, and a total lethal concentration of 0.26 mg/l. The range of adaptation to pH is 6-9. If it is less than 5.5, the egg development will be affected.

(V) Breeding habits Under natural conditions, spring sunshine increases, and when the water temperature rises, the big-eyed lion's owl leaves the overwintering ground and swims to the spawning ground. The spawning grounds are mostly reservoirs and lakes on the windward shoal. They usually have water depths of 0.3 to 2.0 meters, gravel or pebbled sediments, so that the fertilized eggs receive sufficient oxygen. Groups that live in rivers choose stable sites as spawning grounds. The water temperature for spawning differs depending on the latitude of the area. The northernmost group can spawn at a water temperature of 4.5°C to 7.5°C, while the population living in the south spawns eggs at 12.5°C. 15.5 °C water temperature conditions.

The age of sexual maturity of the big-eyed lion's owl is: female 5th to 6th instar, male 4th to 5th instar; the individuals bred in Harbin Fisheries Research Institute are sexually mature at 3rd instar, and the gonadal development in female individuals is early in the fourth period. .

Second, seed cultivation

(1) Since artificial breeding is caused by the big-eyed lion's owl as an introduced species, China does not have its wild population. Therefore, broodstock for artificial propagation use artificially grown sexually mature individuals.

The broodstock for artificial propagation should be selected from 5 to 6 instars of female individuals and weigh more than 1000 grams; males from 4 to 5 instars and weigh 750 grams.

The method of artificial propagation is artificial egg collection and fertilization. Fertilized eggs are hatched at a water temperature of 11°C to 17°C after detackification. Generally, the fertilized eggs can emerge after 15 days to 20 days.

(b) The cultivation ponds for the species of water-spray and summer flower can be used for general fish-breeding ponds, with an area of ​​2000-666 to 6667 square meters per square meter, and a water depth of about 1 meter. 10 days before the fry in the pond, clear the pond with lime, and then 200 kg to 250 kg of basal fertilization per 667 square meters of zooplankton. After seeing the water quality of the fish in the pond, determine the amount of zooplankton and determine the appropriate top dressing or splashing soy milk to ensure that the amount of zooplankton is above 30 mg/L to ensure that the fish fry have sufficient food. At the same time, adjustment of water quality should be done so that dissolved oxygen in the water can always be kept above 2 mg/l.

Stocking densities range from 150,000 to 222,000 per hectare. Generally, after 35 days to 40 days of cultivation, individual fry can grow to about 5 cm.

(3) Cultivation of Summer Flower and Autumn Slice Fish This stage of cultivation can be used in conventional fish culture ponds, either as a single culture or as a nesting culture. The cultivars typically raise 1,500 to 2250 tails of summer fish, which is about 5 centimeters of water per hectare, and do not need to feed it alone. When raising a single fish, it can be used as the main fish, about 5 centimeters of summer fish species with a size of about 5 centimeters per acre, and about 10 kilograms of small trash fish per day, ensuring that the dissolved oxygen in the water is more than 4 milligrams per liter. If properly reared and managed, by the end of the year, individual specifications can reach about 20 cm; 2 instars can be up to 26 cm in size; 3 instars can be up to 38 cm in size.

Third, wintering and cultivation

(a) The overwintering big eye lion's wintering is easier. In the northern areas, they can be stocked directly in outdoor ponds. About 500 rivers per 667 square meters of water are placed. The survival rate in the spring of the second year can be over 80%.

(B) The cultivation and cultivation work can be either nested or monocultured;

During the nesting, 300 to 600 fish species of 50g to 100g per hectare are placed on the water surface, and no separate feeding and management will be conducted. By the end of the year, about 90kg to 150kg will be produced per hectare of water.

The monoculture technology is not yet mature, but it can be operated with reference to the aquaculture technology. (National Aquatic Technology Extension Station Jiang Hongbin)

Our pumpkin seeds planted in the famours Northwest China plain area,with the abundant sunshine, day and night temperature differences, small pests, weak industrial base, less pollution,so the Pumpkin Seeds Kernels produced with fuller grains and better taste.

Pumpkin Kernels' functions:
1. Anti-inflammatory analgesic
2. Bright eye
3. Prevention and treatment of diabetes, prostatitis, hypertrophy of the prostate, atherosclerosis and so on

Pumpkin Seeds Kernels

Pumpkin Seeds Kernels,Pumpkin Kernels,Organic Pumpkin Seed Kernel

NINGXIA IVY BIOTECHNOLOGY CO.,LTD , https://www.berries-goji.com