American redfish breeding method

American redfish broodstock in the United States mainly use the natural growth of fish in the sea area, in China mainly used ponds or cages cultured fish, fishing methods mainly catch fishing nets. The broodstock must be trained for a certain period of time before they are shipped, so that they can adapt to the life in the barrel. Inflation can be carried out on short-distance transportation (within 5 hours). The long-distance transportation must be added with ice to keep the water temperature at about 21°C. Antibiotics can be added to the transfer water to reduce the risk of bacterial infection.
The hormone-induced spawning of redfish can be performed in a smaller, cheaper tank, allowing the spawning season to be synchronized to avoid prolonged broodstock maintenance. However, squeezing eggs is more laborious and requires more solid technical expertise to keep normal fertilization in synchrony with ovulation. Broodstock may not tolerate artificial ovulation.
(1) Estimation of broodstock maturation: Most of the broodstock caught during the spawning season (mid-August to mid-October) can be used for hormone-induced ovulation, but the development of gonads should be checked before hormone injection. For males, pressure can be applied on both sides of the fish and in the abdomen to extrude semen to check sperm production. For females, a 1- to 2-mm diameter glass tube can be inserted into the fallopian tube to obtain tissue samples within the ovary for microscopic examination. Mature eggs appear grayish yellow, egg diameter ≥ 0.5mm.
(2) Injecting hormones: Intramuscular injection of hormones can be performed when the eggs reach maturity, and human chorionic gonadotropin (HCG) of approximately 500-600 IU/kg fish weight can induce ovulation within 24-30 h at 25°C ( Normally it is not necessary to inject the female fish. In the final stage of egg maturation, the egg is increased by 1.0 mm, becomes transparent, and produces 1 to 2 oil balls. When ovulation occurs, the eggs are gently extruded in the peritoneal cavity. After the eggs and sperm are squeezed into a container, they can be fertilized. At the same time, a certain volume of seawater (salinity 28-32) is added, and it can be counted after one minute of stirring.
(3) Post-Oviposition Steps: The mixture of eggs and seawater is then transferred to a well-gassed 10 gallon aquarium for approximately 1-2 hours and examined for meiosis. If 70% or more of the eggs undergo meiosis, eggs can be placed directly into the incubator. If the fertilization rate is 30-70%, the inflating needs to be interrupted for a few minutes, live eggs will float on the water, and dead eggs will sink to the bottom, and the dead eggs will be removed by siphoning.
Incubation of redfish eggs and larvae The production of redfish is buoyant and spherical, with a diameter of approximately 0.9 to 1.0 mm. The eggs are transparent and most of the eggs have a golden yellow oil ball. Incubation usually takes place at 25°C up to 4 hours, and the vegetative organs are well developed after 48 hours of incubation. The optimal salinity for hatching is 28-35%. The temperature should be kept above 22°C, the ammonia concentration should be lower than 0.5mg/l, and the dissolved oxygen should be higher than 3.0mg/l.
The growth and feeding temperature of larval puffer fish is a relatively important environmental factor affecting growth. The ideal conditions for red ovum and larvae are 25°C-30°C and salinity 25-30. Increase 1mm per day at the appropriate temperature for food intake and fish density. Therefore, juveniles developed from a newly hatched larvae to full scales are only weeks (3 weeks). Feeding of larvae was carried out 3 days after hatching. Five rotifers/ml were added at the beginning. Regardless of fish density, they were fed 2-3 times a day until the larvae reached 9-10 days, at which time Artemia began to be fed. The larvae, 1/ml in the first and second days, and then halved, cannot allow Artemia to increase in the aquarium, and the food changes after 15 days. At this time, some shrimp meal and commercial dry feed mix can be added while feeding on Artemia. After about 5 days, the supply of Artemia can be stopped, and after a further 2-3 weeks shrimp can be slowly reduced and dry feed is used. Prepare fish to move into a water tank.
Harvesting of red snapper The red snapper is harder and more vulnerable to injury than other species, and the smaller ones are more adaptable. The fish was harvested after approximately 30 days of stocking. Collect a few samples every week before harvesting with a harvesting box. Ensure good water quality and prevent low dissolved oxygen.
There are two commonly used methods for the transportation and adaptation of red fry. The first type is transported by canvas buckets. Generally, the volume of 1m3 buckets is 5000-10000. The second is the transport of plastic bags (oxygenation), which is more commonly used domestically and has the highest survival rate. At this time, the seawater is first filled into the bag, and the fry are bagged and then filled with oxygen. After that, the bag is put into a foam plastic box, and the bags are generally 2-3 cm and 300-400 tails per bag.

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