First, the imitation of ecological farming Overview 1, the pond conditions selected seawater ponds, an area of ​​3-6 hectares, was rectangular, water depth of 2 - 5 meters, 1.5-4.5 meters deep ditch, the pond pond water level average 0.8-1 meters The deepest is more than 3 meters. The beach surface can store 0.8 meters of water and can be drained every day throughout the year. The perennial specific gravity of seawater in the culture area is 1.0150-1.0190, PH: 7.2-8.4, DO ≥ 4 mg/L, and WT: 2-35°C. In the pond can be mixed with shrimp, white shrimp, crab, scorpion, in order to improve the utilization of water. 7 to 15 days before the fish species enter the pond, disinfect and sterilize 10 to 30 kg of lime per acre. 2. For selection and transportation of seedlings, large-sized fingerlings with a fish size of 80-100 g/tail are generally selected. The seedlings are released from late April to early May. After five months of breeding, the product specifications can be achieved (400 g). the above). Also choose to use small-scale fish species individual length of 7 cm, an average of 10 g / tail, such fish fry to raise winter fish species, in part to reach the small size of the commodity that is listed on the 250 grams. It is better to choose the former as the large size for adult fish breeding. The fish species were evenly selected, with no physical injury or disease, disability deformity, and strong activity. The use of live water transport, local transport with live water boats. 3. Domestication of domesticated fish into the pool should be domesticated (mainly for domestication) for a period of time, which is particularly important in the cultivation of large yellow croakers. (1) Adaptation Stage Seedlings are not adapted to the phenomenon after they have been transported into the new environment. Therefore, the fish should be closely observed within 24 hours after entering the pond to avoid some large yellow croaker swimming to the beach and causing unnecessary losses. In order to facilitate the domestication and management of fingerlings, they are generally kept in ponds (by using nets) and set up food stands. The fish don't need to be fed two days after entering the pool, allowing them to move freely within the confinement range. (2) The preferred bait for bait domestication is the processing of fresh low-value fish and coastal small fish and shrimps into fish gizzards, and the use of roughage and additives as feed. All artificial feeds are also fed through a period of acclimation of fresh fish and feed. In the bait domestication phase, the main work is to be done: fixed point (set bait station), timing (usually once in the morning and evening, ie 6:00 am, 6:00 pm). There is also a bait signal training, that is, a fixed signal is sent before feeding, allowing fish to form conditioned reflexes. This stage is divided into two steps. The first step is to cast a small amount of bait each day to attract the fish species, so that they are used to knot and soak food, it takes a week; in the second stage, gradually increase the amount of bait to the appropriate amount (that is, all-day feeding is for fish About 8% of the total body weight also takes a week. (It is also necessary to explain here that since it is a semi-artificial ecological culture, small fish and shrimp in ponds are natural food for large yellow croaker). The food acclimation process should pay particular attention to the choice of fish and the freshness of the food. This period is mainly to allow fish species to adapt to the new environment and open food intake in a short period of time. It does not seek to increase the food intake of fish species. (3) After the domestication, the fingerlings can naturally cluster to the bait-feeding station each day after the feeding information is sent out. At this time, it is necessary to grasp the amount of feeding, the above-mentioned situation of the feeding of the fish as a benchmark, and grasp the total amount of feeding for the whole day. Do not exceed 10% of the total fish weight. At this time, the enclosure fence can be removed to allow the fish species to enter the whole pool. 4, the choice of food and feeding foods should be suitable, the nearest choice of fresh and low-value small fish (yellow, clam and small junk fish) and fresh fish and shrimp, processed into a fish meal and then supplemented with roughage such as wheat bran and dried Feeds and additives made into a compound feed, and add vitamins in food and drug control. The most obvious decline in the quality of cultured large yellow croaker is body color. The large yellow croaker has a natural body color of golden and orange. After artificial breeding, the body color becomes lighter. The large yellow croaker in the sea maintains body color mainly by feeding on different types of animals and plants. The active pigment ingredients in the digestive system will become two substances after digestion and digestion in the intestine. A vitamin that is almost colorless and has a large variation in molecular structure is mainly provided for tissues to maintain normal metabolism; Molecules that cannot be mutated can still maintain their original color, enter the blood circulation, and deposit under the skin. This type of substance is the main source of body tissue pigments. Therefore, in line with the principles of animal husbandry and fishery ecology, we added carotenoids in artificial diets to improve the quality of large yellow croakers in ponds. Feeding to do fixed, regular, quantitative. Eco-cultured large yellow croakers can also ingest some natural foods in ponds (ie small fish in ponds and some diseased shrimp). 5, daily management in the four fixed timing, fixed point, quantitative, fixed test (test water temperature and water quality) basic work at the same time, daily adjustment of water level and change the water, early spring and late autumn water level is relatively low, help to improve the pool water temperature; For the winter season, raise the water level as much as possible. Strict water quality management: measure the water temperature daily at 6:00 and 14:00; keep the water clear and transparent for 20-40 centimeters; the water temperature is between 18-28 degrees Celsius; the daily change of water and water for every two days is 1/4-1 of the whole pool. /3; When the water temperature is between 13-18 °C, change the water every four days, changing the amount of water does not exceed 25%; When the water temperature is lower than 13 °C, depending on the change in water quality, basically do not change the water; When the water temperature is higher 28 °C, change the water every day, change the amount of water in about 1/3, in the summer heat season to master afternoon drainage, night water. In this way, water stimulation can increase the appetite and shape body color of large yellow croaker; it can be disinfected with lime or chlorine dioxide every other month to prevent the occurrence of diseases. 6. Prevention and control of diseases should be based on prevention and strengthen the daily water quality management; the bait should be fresh; the food table is often disinfected with chlorine dioxide. Common diseases are as follows: Intestinal disease: light appetite loss, severe food refusal, and even death of rotten intestine. The disease is often hot in summer. Analysis of the main reasons for eating frozen baits and metamorphic bait. The prevention and control measures were to choose fresh bait fish, reduce the amount of bait, and add florfenicol or fishery flumic oxalic acid (5 grams of medicine per 100 kilograms of bait, twice the amount on the first day). One course of treatment was 5 days. Gill disease: The diseased fish turns around on the water, checking parasites and licking parasites. Chlorine dioxide is splashed on some water surfaces, that is, 2 acres of water per kilogram of chlorine dioxide is splashed at the fish cluster and near the bait station in the deepwater area; 7. Adult fish fishing (1) Sports fishing: Large yellow croaker is a valuable economic fish in the sea area. It can be used for food and for viewing. The bridges in the farming area are full of water, and the waves are heard, which is totally different from that of the city. We will develop new fishery markets, engage in recreational fishing, and provide sightseeing, fishing, rewards and food to increase the price of large yellow croaker. (2) After catching large yellow croaker for four to five months, the large individuals have reached more than 400 grams. Therefore, they can be set in a cage and set on the net according to market needs. Cage trapping of yellow croaker has very little damage and can provide protection for live fish transportation. Cage catching only meets a small amount of supply and demand. (3) Gill net fishing is sold in small quantities in autumn. Three-layer gill nets can be used for fishing, and large yellow croakers can be caught and kept in small cages for use. (4) The catching of large yellow croaker is poor in low-temperature resistance and can not be overwintered in an ordinary pond environment. Therefore, it is necessary to clear the whole pond before the cold current flows in the winter. The method is to open the gate to release water and catch it back, and it can also be combined with a cage trap that is the inlet and the cage. Finally dry pond clearing. Second, discuss 1, the pond imitates the ecotype raises the yellowish fish body to form the color to be closer than the net box raises the big yellow croaker nearer the wild main cause is the pond first raises the stocking density low, the activity scope is large, and the pond raises the big yellow croaker to capture the natural bait ( Small fish and prawns are richer than cages in raising large yellow croakers; secondly, periodic changes in water are regular, unlike the cage environment, which is directly affected by the tide in the sea area. Bionic yellow croaker's body color is similar to the wild, which is extremely meaningful for improving the quality of artificial cultured large yellow croaker. 2, the cause of large yellow croaker deformity First, the seed itself is deformed, which is a major flaw of artificial seedlings; Second, seedlings caused damage caused by adult malformations; Third, because the large yellow croaker itself is deep-water fish, pond average The water level is less than 2 meters, the water pressure is insufficient and the beach surface is too shallow, causing its deformity. 3. Individual growth of bionic large yellow croaker is not uniform Bionic large yellow croaker cultivation Due to the high density of water activity environment, it also causes uneven feeding, coupled with the insufficient amount of food that can be fed in the pond, and the different ability of the fish itself to ingest the bait. Individual growth is not uniform. The main measures are to increase the food table and improve the quality of food. 4, Bionic yellow fish body color white in addition to the quality of food, the environment is the dominant. Adding the necessary carotenoids to the feed also necessitates deeper water levels and increased turbidity.
Sporting Muscle Tape,Multi Color Adhesive Tape,Kinesiology Tape,Waterproof Kinesiology Tape
RFX+CARE Manufacturing Co.,Ltd. , https://www.rk-rfxcare.com