Bulldog Fish Breeding Technology
Bullockfish is a warm, salty, salty fish. The meat is delicious and has nourishing and strengthening effects. It is deeply loved by the coastal masses of Zhejiang, Fujian, Guangdong, and Taiwan, and the Japanese. Therefore, the market is in great demand and the price is high. Due to the gradual recession in the resources of the big mudskipper, in the 1980s, the large-scale mudskipper fish farming began in the southeast coast of China. Due to the characteristics of short food chain, less fish disease, live fish resistant to long-distance transportation, and easy access to breeding techniques, low breeding cost, and high aquaculture economic benefits, the large-scale mudskipper fish farming has developed rapidly. Currently, the breeding area of ​​large-scaled mudskippers in Fujian Province has reached More than 50,000 acres. However, it still depends on natural seedlings. In order to protect the resources of natural seedlings and promote the sustainable development of the big bunting fish aquaculture industry, it is imperative to carry out the research on the breeding of large ballistic fish and earthen ponds. In 2003, Xiamen University and Xiapu County Fisheries Technology Promotion Station of Fujian Province undertook the project of the major science and technology project of Fujian Province, “Study on the Production of Seedling Technology for Large Bomb Tussosa and Standardized Aquacultureâ€. The project was identified in January 2006, including: Outdoor Pond 2004 and In 2005, a total of 1.254 million large-scale eel eel-bearing fry with a total length of 1.6-3.1cm was cultivated, and the earth-breeding breeding technology ranks first in the world. The technical highlights of the ball-bearing fish pond breeding are described below:
I. Nursery facilities
1. The bottom of the nursery pond is silty clay. Each pond area is suitable for about 1 mu. The depth of the pond is 0.8-1.3m. The pond embankment is firm and watertight, and there is an intake and drainage system. The pool is surrounded by 80 mesh screens. A bracket is placed in the pool to cover the shade net above the pool. One inflatable stone is set around each lom2.
2. Cistern, sand filter and bait biological culture tanks to build reservoirs in high tide areas. Nursery pond area covers a total of 5 mu nursery, 1 reservoir is built, area is 500m2, pool depth is 2m, high tide Seawater is taken in from the gate and water is pumped in at low tide. A sand filter filter was built with an area of ​​40m2. After the seawater was filtered, 120 mesh sieves were fed into the nursery pond and the bait biological culture pool. In order to facilitate the promotion, direct extraction of seawater can also be filtered through a double-layer 120 mesh sieve basket. A small pot-shaped concrete pool (1-2m2) was hatched to hatch the larvae of the shellfish, leaving 1-2 mouths of earth ponds for EM (effective microbial group preparation), compound fertilizer, and fish slurry culture rotifers, copepods, and other bait organisms.
Second, Qingchi infestation and cultivation benthic diatom broodstock fish before breeding 45d, with water clear pond, lime per acre 100kg or bleaching powder 10kg, kill the enemy pests. Wash the pool after the sun pool 5-7d, feeding rice bran 20kg per mu, influent 5-1Ocm, apply compound fertilizer 5-10ppm, cultivation of benthic diatoms.
Third, broodstock rearing and breeding 30 days before spawning broodstock (usually in early March in the lunar calendar). Two-individuals with pond culture and/or tidal flats were selected as broodstock. Male and female sex ratio is 1:1, male and female broodstock can be identified from the appearance of the shredding mastoid, female herniated trachea sudden large and round, was red-like swelling, male fish shunt nipple narrow, long sharp shape. Stocking density is 50kg per acre, broodstock specifications about 25g per tail, broodstock before the release of freshwater and povidone iodine disinfection. During broodstock incubation, the water level is maintained at 5-10cm, and the benthic diatom cultivation and management is strengthened to ensure the nutritional requirements of broodstock.
4. During the natural spawning and hatching of the broodstock, the brooders spawn two batches of eggs each month. The date of spawning is from the tidal wave to the near tidal wave, that is, during the eighth to thirteenth days of the lunar calendar and the three to twenty eight days of the lunar calendar. The batch spawning period is about 6 days. Before the spawning, the water level of the pool water is increased to more than 0.7m, and the female and male brood fish freely pair into the cave to lay eggs in the spawning room of the cave. The fertilized eggs adhered to the top of the spawning chamber and the peripheral wall, and larvae were hatched after 5-6 days. The larvae exit the hole 1-2 days after hatching.
5. Cultivating young and juvenile fish, juvenile fish and juvenile fish in the original pool. Chlorella and Brachionus plicatilis were introduced into nursery ponds in advance. Cast 10ppm EM, 2-3ppm compound fertilizer, 1-2ppm Vital Dan (composite diatom supplement produced by Xiamen Johnson & Johnson Technology Co., Ltd.) and cocklepods and other bait organisms in 2-4pm fish slurry culture tank. When there is a shortage of feed in the pool water, feeds such as rotifers and copepods must be collected in time from the feed bio-culture pond, and hatched larvae of hatchery shellfish and hatched mud can be evenly sprayed into the pool with a high-pressure spray gun. Soft mud containing diatoms and organic debris) can also be supplemented with egg yolk and shrimp slices. Larval larvae hatched 2-3 d after hatching. The series of diets for juveniles, juveniles and early juveniles are granules of organic detritus, larvae of pseudopods, polychaetes and shellfish, copepods nauplii, copepods juveniles and adults, and benthic diatoms. The species and individual size of food organisms in the nursery ponds are diversified, which can basically meet the requirements of different developmental stages and different individuals of the bait, juvenile and juveniles on food organisms. During the nursery period, the water level is gradually increased. When the water level in the nursery pool reaches the upper limit, an appropriate amount of water is exchanged. Fresh water is introduced to adjust the salinity of the pool water to 15-20. During the nursery period, the water temperature does not exceed 32 degrees. The water temperature can be controlled by covering the shade net above the earthen pond and increasing the water level. Different batches of juveniles, juveniles and juveniles do not show similar disability during the cultivation in the same pool. The water quality of the pool water and the dissolved oxygen content of the monitoring pool are often checked. When the water color is yellow-green, the water quality is better. If it is found that the eutrophication of the pool results in super-dissolved oxygen or dissolved oxygen is too low and fish clusters appear uneven light, we must promptly open the aerator. Dissolved oxygen oversaturated can cause larvae to swell and die. During fry cultivation, due to the high water level, which affects the breeding of benthic diatoms, a 4m2 or so foam plate can be installed in each pool and fed with artificial diets and surface sea mud (slime rich in diatoms and organic debris). For broodstock feeding.
Six, fry fishing
Early juveniles (34 days of age after hatching) rely on pelvic fins for adsorption on the nets around the pool. At this time, the fry can be harvested in batches using hand-operated nets and kept in earthen-diatom-rich earthen ponds. When the last batch of fry is harvested, the pool water can be drained and used for fishing on trample nets, set nets and nets.
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