Light-lipped fish also known as grouper, rosefish, etc., for the carp family light-lipped fish is a small economic fish, like to inhabit the gravel bottom, clear water in the river stream, often under the jaw developed stratum corneum shoveling moss and algae on the stone, in the breeding process according to the different breeding methods are divided into pond culture and cage culture, let's take a look at the bare-lip fish separately!
Breeding conditions
Ponds can be dug up in the low and middle tide areas of the reclamation area or built by using the original shrimp breeding ponds, the conditions require that the bottom is sandy and semi-sandy, the hard mud bottom can also be, the surrounding sea area water quality is pollution-free, the transparency is high, the fish pond area is 5 to 10 acres, and the pond water depth is more than 1 meter.
Clear ponds and reefs
After exposure and dredging, the bare-lip fish breeding pond lays some rocks at the bottom of the pond or puts some empty waste tires, tile water cylinders, etc., to adapt to the habit of light-lip fish like to drill holes.
Fingerlings are stocked
Fingerlings cultured with barelips require vigorous, disease-free, black body color and large and small fractionation. Stocking density must be adapted to local conditions, the general size of fish fingerlings is about 100 g / tail, and about 0.5 tails can be stocked per square meter.
Feeding management
1, bait feeding: bait is based on fresh small trash fish, preferably live bait, and according to the size of the fish species, cut into appropriate size blocks for feeding. When feeding, quantitative feeding is taken, generally accounting for 10 to 15% of the fish's body weight in the early stage and 5 to 10% in the later stage. The feeding time is preferably 5 to 6 a.m. and 7 to 8 p.m.
2, reasonable polyculture: in order to save costs, white shrimp can be put into the fish pond of the cultivation of light-lipped fish self-breeding or summer flower fish species polyculture, the residual bait and feces of the bare-lip fish as the bait of white shrimp and, and white shrimp and tilapia are the high-quality bait of the bare-lip fish, so that the fish pond ecology is balanced.
3, daily management: light lip fish breeding requires water temperature in 14 ~ 30 °C, salinity 12 ~ 35%, PH value of 7.8 ~ 8.4, dissolved oxygen 4 mg / l or more, and the daily change of water is not too large, the daily water exchange is generally required 1/3 ~ 1/4. In the breeding process, if the water exchange conditions are poor, and the stocking density is too large, it is easy to occur hypoxic floating head, and mechanical pumping or aerator oxygenation should be taken in time. In addition, it is necessary to patrol the pond frequently and pay attention to safe production.
4, timely fishing: light lip fish to low temperature tolerance is poor, generally should be in the cold wave before the completion of the harvest, for a small number of bare lip fish that do not reach the commercial specifications should be wintered treatment.
Note: Light lip fish medium-sized individuals, common body length of 12 ~ 20 cm, large up to 30 cm, the yield is considerable, for the common economic fish in the production area, but the fish eggs are poisonous, accidental ingestion will cause poisoning, light diarrhea, heavy nausea, vomiting, dizziness, etc., must be treated in time. Well, the bare-lip fish pond culture technology is introduced here for everyone, let's take a look at the bare-lip fish cage culture together!
Farming season
The growth period of bare-lipped fish is generally from May to November in the Zhejiang marine area, and it takes 14-16 months for bare-lip fish to be raised from 50-100 grams of weight to 400-600 grams of commercial fish. Production is generally arranged using two breeding cycles. One is about 100 grams of fingerlings purchased from May to July of the first year to 150 to 200 grams of weight before wintering, and is raised through wintering until the winter of the second year, and the other is a large-size fish fingerling with a weight of 200 grams in April to May, and can be raised to 400 to 600 grams of commercial fish for sale before winter in that year.
Culture density
According to the production practice and test results of many years of production practice and testing, the stocking density of bare-lipped fish in cage culture is considered to be 3×3×3 meters, and its annual stocking density is 10 kg/m2. This stocking density allows for high survival rates, high total weight gain and net yields, and low bait coefficients.
Bait throwing technique
Fish species after transportation, feeding into the box need 7 to 10 days to adapt to environmental conditions before starting to feed, before the formal feeding should be domesticated, the bait is mainly for the next miscellaneous fish, bait coefficient is generally 7 ~ 8:1. There are several problems to be paid attention to when using mixed bait, one is that the light-lipped fish have a strong habit of feeding bait, and there is a large adaptation and transition process to feed the next miscellaneous fish to the artificial mixed bait. Second, the formula of the bait should be reasonable, and its protein content should not be less than 40%. Third, if the grouper encounters food that is uncomfortable or not fresh enough, it will spit, so it is necessary to consider palatability. Fourth, it needs to be made into soft particles, and its size should be consistent with the caliber of the light-lipped fish. Light lip fish suspicious, strong selectivity of bait, so the bait technology has a great impact on the feeding of light lip fish, the feeding time is 8 to 11 a.m., the feeding amount accounts for about 5 to 10% of the fish's body weight, the feeding method should be slow, and then cast after the fish are eaten. Bare-lipped fish generally do not eat bait that sinks to the bottom of the cage.
Wintering management
1. Sea area selection: select the sea area with slow flow rate, small wind and waves, and the lowest water temperature above 8 °C. In order to reduce the impact of tide and wind waves on wintering fish, some empty cages should be set up around the wintering cage to slow down the impact of water flow and wind waves on the wintering cage, and a certain number of wintering equipment should be set up in the cage, sacks are hung upside down or rigid plastic cages and tubes are attached.
2. Stocking density: General stocking size of 200 g/tail fingerlings, density of 350~400 fish/carton. During the wintering period, you should choose to feed in windy and warm weather, the amount of feeding is less, but the quality of the bait is better, try to feed live bait. In addition, places with conditions can use indoor heating for wintering or land plastic greenhouses for wintering.