Also known as sweet-scented osmanthus fish and seasonal flower fish, squid is a rare species of freshwater fish. It has many varieties, such as squid, big-eyed owl, spotted plover, and dark-colored oystercatcher. The most rapid growth of the mouth lice, followed by big eyes. Squid is a typical carnivorous fish, like to eat live food, often devour more than their own length of carp, grass carp, herring, bream, scorpion, scales and other live fry.
Due to the low natural resources of squid, artificial breeding is restricted by technology and the production is developing very slowly. The supply of the market is in short supply and the farming prospect is very considerable.
Reproduction
The salmon breeding season is generally from mid-May to early July. Females reach sexual maturity in two years, and males reach sexual maturity in one year. Mature broodstock can reproduce naturally in rivers, lakes, and reservoirs. It usually lays eggs on rainy days or in micro-flowing waters. Fertilized eggs hatch with water.
First, bred broodstock mature broodstock must be intensive cultivation, cultivation time is generally about six months, with emphasis on the fall and spring. There are two points to pay attention to in intensive cultivation: First, there must be sufficient bait fish; Second, to ensure good water quality, it is best to flush water regularly to create a micro-flowing environment to ensure the good development of broodstock. Special attention should be paid to the fact that before the broodstock breeding, it is necessary to determine the breeding objects. Generally, breamfish should be selected for breeding to increase the economic benefits of breeding.
Second, the broodstock fish selected in the natural waters or pond cultured carp, after artificially fortified after cultivation, disease-free and injury-free and robust individuals can be used as artificial breeding broodstock. The weight of the male fish is 1-2 kg and the female weight is 2-3 kg. The difference between the male and female squid is that the male jaw is long and has a lot of over the upper jaw. The body color is brighter, the markings are clear, and there is semen outflow in the abdomen; the female jaw is short and the maxillary length is almost the same. Females with well-developed gonads are characterized by a clear outline of the ovary, a soft abdomen, prominent swelling of the genital hole, and a yellow-green transparent egg. Judging whether the male fish is mature, mainly by light pressure on the abdomen, there is milk white semen out, into the water that is scattered, you can prove good gonadal maturation.
Third, the artificial incubation hatching method using looped water hatching. Since the squid fertilized eggs are non-adhesive and semi-floating eggs, and are larger than the eggs of domestic fish, the flow rate during hatching should be correspondingly larger to prevent the deposition of eggs. The time for hatching of fish eggs is closely related to water temperature. In the loop water incubating, the water temperature takes about 28 hours at 24-28°C, and about 24 hours at 30°C.
Nursery
I. Pond cultivation
The fry pool should be completely cleared. Use 150 kg of quick lime per mu to destroy the enemy's harmful organisms and pathogens. After the clear pond is put into a 1 meter deep new water, 200 fish fry are put on the water per square meter. Feeding palatable feed according to different stages of growth of the carp is the key to raising the survival rate of the fry. Freshly hatched eel fry for 3-5 days is suitable for cockroach and carp seedlings of the same age. 6-8 days of salmon seedlings can also eat 4-5 days of the four fry. 9-15 days old salmon fry can eat 1 cm long bait fish. According to production experience, a three-centimetre-long eel fry (scrub) was bred. In the first 10 days, 40 fish fry were fed on average each day. After 10 days, 15 fish fry were slightly smaller than their own specifications. If the number of bait fish is insufficient, it will cause the salmon fry to kill each other. Therefore, while nurturing salmon fry, we must also develop bait fry cultivation. In actual production, the amount and type of feeding can be flexibly controlled to meet the feeding standards of the eel fry.
Second, the fish pond microfluidic water breeding carp seedlings require higher dissolved oxygen. Therefore, where conditions permit, small micro-water cement tanks can be used for cultivation, and spawning tanks and loops in artificial breeding of fish can also be used. Generally, the area of ​​small ponds is about 20 square meters, and salmon fry can be placed per square meter. 1000 or so. To ensure that the water is fresh, there is micro-flowing water, so that the water is in a state of frequent exchange. The use of artificial breeding loops for the cultivation of carp seedlings, due to large exchange of water, dissolved oxygen, stocking density can be increased to 3-5 million per cubic meter of water. Because the water quality of the looped water is fresh and pollution-free, the operation and management are convenient, and the disease is also low, so the survival rate of raising the fry with this flowing water method is high.
Third, cage cultivation In a water body with good water quality, cages can be set up for grading, which can increase the survival rate of eel fry. Generally, for ease of operation, a three-level cage breeding method can be used: a large-scale net box with a size of 50 mesh, a size of 2 meters, a meter and a meter; a size of 0.2 cm for a secondary mesh box with a size of 5 meters and 1 meter. m; three-level net boxes are 0.5 cm in size and specifications are 10 meters, 1 meter and 1 meter. The cage cloths are made of nylon or vinylon mesh, and the frame of the cage is a floating frame device. The density of carp seedlings stocked in the first-class cages is 1-1.5 million per carton; for 15 days or so, the body length can reach 1.8 centimeters or so, and it can be transferred to secondary cages for cultivation. Each box can be stocked with 1,000-2,000 fishes. Feeding 7-10 days, body length up to 3 centimeters, and then transferred to the three cages, the density of each box is 500-1000. After 15 days of cultivation, you can become a 10 cm fingerling. The key to nurturing squid in cages is to maintain clean water quality and a sufficient amount of palatable feed fish.
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