Method for restoration and reconstruction of sediment habitat of spawning grounds of salmon in natural rivers

A technology for salmon fish and spawning grounds, which is applied in the field of restoration and reconstruction of bottom habitat of salmon spawning grounds, can solve problems such as being unsuitable for salmon spawning, etc., and achieves the improvement of smoothness and reduction of attachments. Effect

Active Publication Date: 2019-04-02
HEILONGJIANG RIVER FISHERY RES INST CHINESE ACADEMY OF FISHERIES SCI
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  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that the bottom habitat of the spawning ground of salmon fish is not suitable for spawning of salmon fish due to the influence of natural evolution and human activities

Method used

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  • Method for restoration and reconstruction of sediment habitat of spawning grounds of salmon in natural rivers

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specific Embodiment approach 1

[0022] Specific implementation mode one: a kind of natural river salmon fish spawning ground bottom quality habitat restoration and reconstruction method of the present embodiment, it comprises the following steps:

[0023] 1. Observation of river bottom quality: select areas with suitable water quality and rich groundwater for bottom quality observation, analyze the composition of the bottom and the composition of bottom habitat factors;

[0024] 2. Recultivation or pre-pavement treatment of the river bottom: dredging and transporting the sediment covered sediment area on the cobblestone bottom; scraping and scouring the sediment in the rock crevices or the compacted pebble section; Remove the aquatic plants growing on the sediment in the sand or stone crevices; level and restore the uneven bottom due to sand mining; clean up the debris accumulated in the river;

[0025] 3. Re-cultivation of the river bottom: bottom re-cultivation is suitable for river sections where the part...

specific Embodiment approach 2

[0030] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is: suitable water quality in step one means that the vegetation coverage rate in the river basin reaches 70%, the control effect of water and soil loss is good, and it is effectively controlled. The flow rate is 0.2-1.0m / s, the average water depth of the river reaches 30cm, the bottom of the river bed is composed of pebbles or gravel, and the dissolved oxygen reaches 6mg / L. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0031] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one is: the substrate after analysis in step one is required to reach the following standard and then perform the operation of step two:

[0032] The particle size of the gravel is 1-10cm; the surface of the gravel is smooth; the thickness of the gravel layer is more than 30cm; the dissolved oxygen is more than 6mg / L; the water flow is surging; the gravel substrate of the river is evenly distributed; There is no noise or vibration in the egg field section; no vehicles, boats, people or animals trample on the gravel.

[0033] Others are the same as in the first embodiment.

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Abstract

The invention provides a method for restoration and reconstruction of a sediment habitat of spawning grounds of salmon in natural rivers, and relates to a method for ecological restoration and reconstruction of the sediment in the spawning grounds. According to the method for the restoration and reconstruction of the sediment habitat of the spawning grounds of the salmon in the natural rivers, theproblem that the spawning grounds in the distribution area of salmon are not suitable for spawning and hatching of salmons under the influence of the natural evolution and human activities can be solved. The method for the restoration and reconstruction of the sediment habitat of the spawning grounds of the salmon in the natural rivers comprises the steps that the river basin ecological environment and the river bed topography in salmon spawning rivers are investigated; a river area with suitable water quality and abundant groundwater is chosen for the sediment habitat observation; historicaloriginal pebbles or gravel (hereinafter referred to as gravel)river beds are selected; the sediment composition is analyzed; the restoration method is worked out based on the sediment conditions; andthe sediment gravel for duplicate plough or repavemnet is used to improve the sediment habitat of the spawning grounds. The method for the restoration and reconstruction of sediment habitat of spawning grounds of salmon in natural rivers comprises can be applied to the field of ecological restoration.

Description

technical field [0001] The invention belongs to the field of ecological restoration, and in particular relates to a method for restoring and rebuilding the substratum habitat of a salmon spawning ground. Background technique [0002] Salmon fish produce sinking eggs, the eggs are large, and the amount of fecundity is low, generally 3000-5000. Natural spawning rivers are located in mountainous tributaries or mountain streams with good water quality, rich groundwater, and a certain slope. The bottom of the spawning ground is generally cobblestone or gravel (referred to as gravel) bottom. Broodstock reproduction has the habit of mate selection exclusivity and nest spawning habit, that is, a pair of male and female broodstock chooses a suitable habitat to make a fish nest (fish nest, nest) in the bottom of a certain thickness of gravel layer, and the length of the nest is the same as the length of the female fish (fork) Length) is about the same, the depth is about 10cm, and it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B3/02A01K61/10
CPCA01K61/10E02B3/02Y02A20/402Y02A40/81
Inventor 刘伟
Owner HEILONGJIANG RIVER FISHERY RES INST CHINESE ACADEMY OF FISHERIES SCI
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