Fence fish farming (or cofferdams, cages, fish farming) is a new breeding technology rich in high-tech content. In recent years, with the continuous promotion and application of the fence fish culture technology, the industrialization process and economic benefits of aquatic products have been rapidly improved. However, due to the fact that some farmers failed to scientifically master the site selection technology of fish in the fence, blindly selecting the water area resulted in low fish quality and breeding efficiency. Therefore, when fishing in the fence, be sure to look carefully at the "feng shui" site.
First, choose a quality source of water before the fence must consider the pollution of the water area and adjacent areas. For high-quality water bodies suitable for fish reclamation, the total dissolved oxygen should reach 6 mg/L to 8 mg/L in the breeding season, the pH of the water body should be 7 to 8.5, and the maximum annual salinity change should not exceed 4%. There should be no toxic gases, excessive heavy metal ions, etc. In addition, wild fish and shrimp in the waters used for pen fish farming should be able to normally live throughout the year.
Second, the choice of flat waters reclamation of fish in the water area requires that the bottom of the river (lake, reservoir) is flat, the bottom mud is soft and hard, and the estuary (water outlet) should not be small and should be narrow and not wide. The water for lake fish farming on the fenced fish should generally be below 500 mu; the area for river fish farming should generally be below 50 mu. Because the water volume of such water bodies is stable, it is also convenient to start catching, and the supply of oxygen is sufficient and uniform. If the water area is too small, the water is not easy to self-purify and stabilize; if the water area is too large, it will result in scattered feeding and fishing difficulties.
Third, pay attention to the hydrological conditions in the selection of pen fish farming waters, should pay attention to the following hydrological conditions: 1. Water requirements for the fence fish farms swing, the water depth of the river should be 2 meters to 3 meters, the annual water level change should not exceed 1 meter . There are no major droughts in the water during the breeding season. The speed of the water in the culture area is preferably 0.05m to 0.1m/s, and the water flowing through the emergency fishing facilities is easily washed away. When the water flow is too slow, the water exchange is poor. 2. Aquaculture waters should be easily accessible. It is required that the transportation and civilian vessels entering and leaving the aquaculture water should not be excessive, and the fishery waters should have the same roads, so that the fish products can reach the sales market by both land and water. If the conditions permit, the fence fish breeding base can also be set up in the suburbs of cities and towns with convenient transportation, so as to reduce the transportation costs and improve the breeding efficiency. 3. Pay attention to weather and bait resource conditions. The choice of fence for fish farming requires that the natural foods in the fence area be abundant. In addition to abundant plankton, lakes or river bottoms should also be rich in aquatic plants such as Vallisneria alternifolia, Hymenocallis radiata, and Malayia arborescens, as well as benthic organisms such as snails, centipedes and earthworms. In this way, not only the amount of artificial bait fed, but also the utilization rate of bait and the stocking density of fish species can be greatly reduced, and the natural bait is free from pollution and residue, which is beneficial to improve the quality of aquatic products.
First, choose a quality source of water before the fence must consider the pollution of the water area and adjacent areas. For high-quality water bodies suitable for fish reclamation, the total dissolved oxygen should reach 6 mg/L to 8 mg/L in the breeding season, the pH of the water body should be 7 to 8.5, and the maximum annual salinity change should not exceed 4%. There should be no toxic gases, excessive heavy metal ions, etc. In addition, wild fish and shrimp in the waters used for pen fish farming should be able to normally live throughout the year.
Second, the choice of flat waters reclamation of fish in the water area requires that the bottom of the river (lake, reservoir) is flat, the bottom mud is soft and hard, and the estuary (water outlet) should not be small and should be narrow and not wide. The water for lake fish farming on the fenced fish should generally be below 500 mu; the area for river fish farming should generally be below 50 mu. Because the water volume of such water bodies is stable, it is also convenient to start catching, and the supply of oxygen is sufficient and uniform. If the water area is too small, the water is not easy to self-purify and stabilize; if the water area is too large, it will result in scattered feeding and fishing difficulties.
Third, pay attention to the hydrological conditions in the selection of pen fish farming waters, should pay attention to the following hydrological conditions: 1. Water requirements for the fence fish farms swing, the water depth of the river should be 2 meters to 3 meters, the annual water level change should not exceed 1 meter . There are no major droughts in the water during the breeding season. The speed of the water in the culture area is preferably 0.05m to 0.1m/s, and the water flowing through the emergency fishing facilities is easily washed away. When the water flow is too slow, the water exchange is poor. 2. Aquaculture waters should be easily accessible. It is required that the transportation and civilian vessels entering and leaving the aquaculture water should not be excessive, and the fishery waters should have the same roads, so that the fish products can reach the sales market by both land and water. If the conditions permit, the fence fish breeding base can also be set up in the suburbs of cities and towns with convenient transportation, so as to reduce the transportation costs and improve the breeding efficiency. 3. Pay attention to weather and bait resource conditions. The choice of fence for fish farming requires that the natural foods in the fence area be abundant. In addition to abundant plankton, lakes or river bottoms should also be rich in aquatic plants such as Vallisneria alternifolia, Hymenocallis radiata, and Malayia arborescens, as well as benthic organisms such as snails, centipedes and earthworms. In this way, not only the amount of artificial bait fed, but also the utilization rate of bait and the stocking density of fish species can be greatly reduced, and the natural bait is free from pollution and residue, which is beneficial to improve the quality of aquatic products.
Wire Mesh Fence
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