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CN-121970700-A - Control method for omnivorous fish and application thereof

CN121970700ACN 121970700 ACN121970700 ACN 121970700ACN-121970700-A

Abstract

The invention relates to a control method of omnivorous fish and application thereof, belonging to the technical field of water ecological restoration. The invention provides a control method of omnivorous fish, which comprises the step of placing omnivorous fish in a small water body containing omnivorous fish, wherein the mass ratio of the omnivorous fish to the omnivorous fish is 1:1-3. According to the invention, the carnivorous fishes with a specific proportion relationship are put into the small water body containing the omnivorous fishes, so that the biomass of the omnivorous fishes can be obviously reduced, the cascade effect is triggered, the predation of the omnivorous fishes to zooplankton is reduced, the biomass of the zooplankton is increased, the predation of the zooplankton to the zooplankton is increased, the growth of the zooplankton is further inhibited, the disturbance of the omnivorous fishes to the bottom mud is reduced, and the total suspended matter concentration is reduced, so that the effect of repairing the water quality is achieved.

Inventors

  • HE HU
  • HUANG XIAOLONG
  • ZHANG YOU
  • LI KUANYI
  • GAO JUNFENG

Assignees

  • 中国科学院南京地理与湖泊研究所

Dates

Publication Date
20260505
Application Date
20260211

Claims (7)

  1. 1. A control method of omnivorous fish is characterized in that carnivorous fish is put in a small water body containing omnivorous fish; the mass ratio of the carnivorous fishes to the omnivorous fishes is 1:1-3.
  2. 2. The control method according to claim 1, wherein the omnivorous fish comprises one or more of crucian, carp, tilapia and loach.
  3. 3. The control method of claim 1, wherein the small body of water comprises one of a pond, a lake, and a ditch.
  4. 4. The control method according to claim 1, wherein the carnivorous fish comprises one or more of catfish, mandarin fish, and snakehead fish.
  5. 5. The use of the control method according to any one of claims 1 to 4 for improving the quality of water.
  6. 6. The use of the control method according to any one of claims 1 to 4 for increasing the biomass of zooplankton in a water body.
  7. 7. The use of the control method according to any one of claims 1 to 4 for reducing biomass of phytoplankton in a water body.

Description

Control method for omnivorous fish and application thereof Technical Field The invention relates to the technical field of water ecological restoration, in particular to a control method for omnivorous fishes and application thereof. Background The fish in the small water body is mainly benthonic omnivorous fish such as crucian carp, carp and the like. The fish living on the bottom layer of the water body has the foraging activity of reducing the number of large zooplankton on one hand, resulting in insufficient grazing pressure on the zooplankton, and on the other hand, the benthic omnivorous fish can greatly disturb the bottom mud, resulting in turbidity of the water body, increased release of nutritive salt and deteriorated water quality. The fish has strong stress resistance (such as low temperature resistance and hypoxia), strong reproductive capacity, is suitable for various habitats (such as pasture and water areas, open water areas and the like), is difficult to remove, can be maintained for a short time by the existing manual capturing method, and has the advantages of difficult lasting effect and labor and financial resources consumption. Based on this, the present invention has been proposed. Disclosure of Invention The invention aims to provide a control method of omnivorous fish and application thereof, which are used for solving the problem of poor water quality of a small water body caused by benthonic omnivorous fish in the prior art. In order to achieve the above object, the present invention provides the following technical solutions: The invention provides a control method of omnivorous fish, which comprises the steps of putting carnivorous fish in a small water body containing omnivorous fish; the mass ratio of the carnivorous fishes to the omnivorous fishes is 1:1-3. Preferably, the omnivorous fish comprises one or more of crucian, carp, tilapia and loach. Preferably, the small body of water comprises one of a pond, a lake and a trench. Preferably, the carnivorous fishes comprise one or more of catfish, mandarin fish and snakehead fish. The invention provides application of the control method in improving water quality of water bodies. The invention provides application of the control method in improving the biomass of zooplankton in water. The invention provides application of the control method in reducing biomass of phytoplankton in water. The invention has the following technical effects and advantages: According to the invention, the carnivorous fishes with a specific proportion relationship are put into the small water body containing the omnivorous fishes, so that the biomass of the omnivorous fishes can be obviously reduced, the cascade effect is triggered, the predation of the omnivorous fishes to zooplankton is reduced, the biomass of the zooplankton is increased, the predation of the zooplankton to the zooplankton is increased, the growth of the zooplankton is further inhibited, the disturbance of the omnivorous fishes to the bottom mud is reduced, and the total suspended matter concentration is reduced, so that the effect of repairing the water quality is achieved. Drawings FIG. 1 is a schematic diagram of an embodiment; FIG. 2 is a diagram of an experimental design; FIG. 3 shows the measurement results of total nitrogen content, total phosphorus content, solid particle content and chlorophyll alpha content in water samples of different treatment groups; FIG. 4 shows the results of the biomass measurements of zooplankton, phytoplankton and benthic omnivores of different treatment groups. Detailed Description The invention provides a control method of omnivorous fish, which comprises the steps of putting carnivorous fish in a small water body containing omnivorous fish; the mass ratio of the carnivorous fishes to the omnivorous fishes is 1:1-3. In the invention, the omnivorous fish comprises one or more of crucian, carp, tilapia and loach. In the present invention, the small body of water includes one of a pond, a lake, and a ditch. In the invention, the carnivorous fishes comprise one or more of catfish, mandarin fish and snakehead fish. The invention provides application of the control method in improving water quality of water bodies. The invention provides application of the control method in improving the biomass of zooplankton in water. The invention provides application of the control method in reducing biomass of phytoplankton in water. The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention. Examples The schematic diagram of the scheme of this embodiment is shown in fig. 1, and the specific scheme is as follows: The experiment was performed in 6 cement ponds on the side of Taihu lake in east mountain county, suzhou, each cement pond being 3m long and wide and 2.5m deep. 2 months before the experiment, pumping and brushing each ce