American bigmouth fish roe biology and reproduction breeding technology

The American bigmouth bass, also known as the giant burdock, is a species of oystercatcher, which is a large-scale freshwater economic fish native to North America. The fish has a delicious flesh, a large individual, fast growth, early maturation, and strong fertility. Features.
The National Fisheries Research Institute of Hubei Province introduced the first high-quality freshwater fish base in the United States from the United States in 1993. From 1997 to 1998, it promoted more than 50 million seedlings in more than 20 provinces and cities including Guangdong, Fujian, Hubei, Liaoning, Shanghai and Beijing. 1 The biological characteristics of the American bigmouth puffer fish 1.1 morphological characteristics of the body size: large mouth rouge fish body into a spindle-shaped, body scales, large scales, imbricate, dorsal fin base around a reflective scales, no abdominal edge. The snout is blunt, mouth-mouthed, with large mouth cracks, no jaw teeth, large eyes, nostrils above the eyes, 1 pair of front and rear nostrils, separated by valves, 0.8 to 0.9 cm before and after, no need; , Mucus, anus from the anal fin base about 1.0cm, invagination. Tail handle short. The dorsal fins are long and have a "V" shape. The fins are serrated. The pelvic fins and pectoral fins are each paired and irregularly oval. The anal fins are approximately triangular and the caudal fins are forked, but they are slightly different from the caudal tail. Dorsal fins III 23 ~ 27; pectoral fins 16 ~ 17; pelvic fins 1,9 ~ 10; anal fins III, 9; caudal fins, 26. The first zygomatic arch has 120 to 160 twitches per line, 60 to 80 larvae, and 8/37 to 41/7 lateral lines. The body length is 2.6 to 3 times the body height, 3.5 to 4.2 times the head length, and the body length is 3.4 to 3.8 times the body length, and the tail length is 3.5 to 4.2 times the body length.
Body color: head olive, brown green on the upper side, lower back greenish blue, abdomen white, mature female and male marriage color is clear, bright color, adult fish and broodstock body color in the sun colorful, beautiful.
1.2
The internal structure of the spine is composed of 32 to 34 pairs of vertebrae of the vertebrae and the caudal vertebrae. There are 5 shoulder bones in the front of the dorsal fin. The first zygomatic arch is 120 to 160 in each column, and 60 to 80 in the iliac crest. The front was blunt, followed by a triangular cone, and there were four tubes in the posterior chamber different from the iliac crest.
1.3. Edible American bigmouth squid is mainly fed with phytoplankton Chlorella at the larva stage. At the same time, it feeds on the crustaceans of zooplankton, sword leeches and rotifers, etc.; 2~6cm bigmouth puffer fish feed on zooplankton. The cladocera is dominant; 7-9cm larvae, in addition to a large number of feeding cladocera, but also a large number of leeches, chironomid larvae, aquatic insects, molluscs and so on. Under the condition of artificial breeding, the compound feed composed of cotton cake, vegetable cake, peanut cake, artificially prepared dried fish meal, cakes, rice bran, corn flour and the like are eaten.
1.4
The largest individuals in the United States can grow up to 36.3 kg. In the United States of origin, up to 500g for 1st instar fish and 800 to 1500g for 2nd instar fish. In the climate conditions in Central China, the fish can reach 135-605 g at the end of the year, 700-1500 g in the second year, and 1500-2500 g in the third year. From the growth of more than 20 provinces, cities, and autonomous regions across the country, its growth advantage is comparable to that of local squid and hybrids.
1.5
Habits of life American bigmouth fish is a thermophilic fish, the survival temperature is 0 ~ 41.5 °C, the optimum water temperature is 18 ~ 32 °C, in this temperature range, the fish eat up and cluster, when the water temperature is below 7 °C, the food intake decreased , Without clustering, when the water temperature is below 4°C, stop feeding. Largemouth bass can safely pass winter (such as Harbin) in cold areas, and they can develop adult fishes in that year.
Largemouth bass can grow in a saline environment of 2.1 to 7.2g/L. Experiments conducted by former Soviet Union experts to conduct large-scale fingerling culture showed that when the salinity was 2.8 to 3.7g/L, the survival rate was 70%.
The fry and fingerling stages are not strict with the light, and the yolk sac fry can grow completely in the dark environment.
Normal growth of dissolved oxygen requires more than 3.5mg/L. At a water temperature of 30.6 to 32.1°C, the point of asphyxiation of large-mouthed fish (6.9 to 10 cm) was 0.300 to 0.350 mg/L.
1.6
Reproductive habits in China's central China, the male fish 2 instar 0.8 ~ 1.5kg, an average of 1.3g; female 3rd instar, body weight 1 ~ 2.5kg, an average of 1.75kg reached sexual maturity. In the natural waters, the American bigmouth puffer fish lays eggs in shallow water bays with abundant water and rich grasses. The eggs are sticky and adhere to aquatic plants. When the natural water temperature rises to 15°C, male and female fish begin mating and spawning; 18~24°C is the best spawning water temperature, when the water temperature exceeds 31.5°C, spawning is stopped. Under natural conditions, a 66.5cm long female Fish can produce 750,000 eggs. 1.7 Meat content and nutrient content The fat content of bigmouth bass is between 69% and 72.5%, and protein content is between 17.99 and 18.03%, which is higher than that of China Blue (15.8%), Grass (15.5%), Tantalum (15.3%), and Poria (14). %) etc. are also higher than pork (9.5%).

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