First, the imitation of ecological farming summary Seawater ponds are selected and have an area of ​​3-6 hectares and are rectangular. The water depth is 2-5 meters. The depth of the ditch is 1.5-4.5 meters. The average water level of the pool is 0.8-1 meters, and the deepest is more than 3 meters. 0.8 meters of water storage, 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, seed selection and transportation Generally, large-scale fingerlings with a fish species specification of 80-100 g/tail are placed in the period from late April to early May. Farming after five months can reach commercial specifications (above 400 g). 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. 3, domestication into the pool After a fish species has entered the pond, it must 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, bait and feeding The choice of food should be suitable, and the nearest fresh and low-value small fish (Astragalus, barley and small junk fish) and fresh fish and shrimp should be the first choice, and the fish should be processed into a fish meal, supplemented with roughage such as wheat bran and dry feed and additives. Formulated feeds, added vitamins in foods, 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 Work Suit is one of the most common types
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1. Pond conditions
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.
In the four basic fixed-point, fixed-point, quantitative, fixed-measurement (test water temperature and water quality) basic work at the same time, daily to adjust the water level and change the water, early spring and late autumn water level is relatively low, is conducive to improve the pool water temperature; summer and winter to Increase the water level as much as possible.