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I. Nursery facilities
1. A total of 20 nursery ponds with a total area of ​​750 square meters.
2. A total of 10 unicellular algae cultivation ponds with a total area of ​​250 square meters.
3. Water treatment systems, gas supply systems, and other shellfish breeding requirements are the same.
Second, the source of pro-Bei
The end of June to early August is the natural breeding season of local barley. From the Lianyungang, Yancheng and nearby ponds, the shells with a length of 2 cm to 3 cm, non-invasive, non-lesioned, and full gonads are selected as pro-scallops and transported to the nursery by dry methods. field.
Third, oxytocin and hatching pro-shellfish, with 500ppm potassium permanganate solution disinfection soak for 10 minutes, dry 4 hours to 6 hours, and then into the urine production pool, all shade, inflated, oxytocin. After 2 hours to 3 hours, pro-shellworm spawned and ejaculated. Fertilized eggs hatching density of 30 / mL ~ 40 / mL, hatching water temperature 26 °C ~ 28 °C, seawater specific gravity 1.015 ~ 1.020, pH 7.8 ~ 8.6, light intensity 1000lx ~ 3000lx, continuous oxygenation.
Fourth, larva rearing
1.26 °C ~ 28 °C conditions, after about 16 hours of fertilized eggs developed to D-type larvae, with 300 mesh sieve larvae selected young bred, incubation density control at about 10 / mL. The food organisms are dominated by golden algae, and the density of food organisms in the water body is maintained at 30,000 to 50,000 per mL. Change the water twice a day. The daily water exchange volume is 50% in the early stage of cultivation and 100% in the later stage of cultivation.
2. The water quality requirements for larvae cultivation are:
Water temperature 26 °C ~ 28 °C, seawater specific gravity 1.015 ~ 1.020, pH 7.8 ~ 8.6. Maintain continuous oxygenation.
Fifth, larvae abnormal attachment
1. Attachment tank preparation 1 day before the larvae attachment, the highly-sterilized sea mud shall be sieved and sieved through a 250-mesh sieve and uniformly spread on the bottom of the pool with a thickness of 1 mm to 2 mm.
2. D-type larvae were incubated for 5 days to 7 days. After most of the larvae had eye spots, they were collected on a 250-mesh sieve and poured into an attachment pool. The incubation density was 4 cells/mL to 5 cells/mL. The mixed algae of Platymonas algae is fed to keep the density of bait organisms in the water body from 50,000 to 60,000/mL.
6. Nurturing young children
After 1.2 days to 3 days, the young feet of juveniles were fully formed, and 90% of the juveniles were reared for cultivation of benthic juveniles. The food organisms were mainly fed with gold algae and Planella, supplemented with other algae, mixed and fed, and the density of bait organisms. It is 50,000/mL to 80,000/mL.
2. Change the water twice a day, change the amount of water per day is 100% to 120%; every 3 days to 5 days down the pool 1 times, and according to the growth of juveniles reasonable adjustment of its cultivation density.
Seven results
From June 2004 to September 2004, a total of 600kg of green shellfish was spawned and 3 batches of seedlings were obtained. The seed size reached 2 million grains/kg to 3 million grains/kg, and the total number was 571.509 million grains.
VIII. Discussion
1. The water for raising seedlings is fresh and must be filtered through secondary sand. No serious diseases occur during the entire nursery process.
2. In recent years, with the increasing pollution of seawater, many natural breeding sites for barley have gradually disappeared, and with the increasing scale of cultivation, artificial breeding has become the only way to solve the shortage of barley seedlings.
3. Through several years of practice in raising seedlings, the author believes that the artificial breeding technology of the indica cristata has matured and can be produced in large scale.
Author: Xujing Salt Field Fisheries Division, Lianyungang City, Jiangsu Province
Qinglan factory artificial seedling raising technology
Barley, commonly known as barnyardgrass, black sea bream, stone snail, etc., belong to the family Carettaeidae, and is a common economic shellfish in coastal China. It also has medicinal value. Qinglan industrialized artificial nursery technology is the bottleneck for the scale and industrialization of highland barn breeding. Based on the continuous production practice for many years, the author summarizes the planting technology of barley.