Reservoir fish resource acoustics investigation method
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A technology of hydroacoustics and fish, applied in the field of acoustic investigation of fish resources in reservoirs, to achieve the effects of ensuring representativeness, efficient and fast investigation, and effective data support
Inactive Publication Date: 2015-01-07
INST OF AQUATIC LIFE ACAD SINICA
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The method solves the problems of path planning and fish sample sampling in acoustic survey of fish stocks in reservoirs
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Embodiment 1
[0028] A method for acoustic investigation of fish resources in a reservoir: the steps are:
[0029] 1. Design multi-mesh composite gillnet: The net is made of 12 pieces of three-layer nylon wire mesh with different meshes. The mesh is 0.18 or 0.20 or 0.23-0.25mm nylon wire. The average height is 4 or 5 or 6m, the length is 9 or 10 or 11m, and the total length is 108 or 120 or 132m; the mesh size and arrangement of the internal network are a=45, 20, 6.25, 10, 55, 40, 12.5, 25, 15, 60, 35 and 30mm; the mesh size of the outer net is a = 200mm; the upper line of the net is made of foam floats, and the lower line is made of lead sinkers, so that the net stretches vertically in the water and fits the bottom;
[0030] 2. Design the length of the navigation path: The unit of navigation length is km, and the unit of area is km 2 ;
[0031] 3. Design navigation path: According to the terrain characteristics of the reservoir, divide the water surface into tributary 1, reservoir head...
Embodiment 2
[0042] A method for acoustic investigation of fish resources in a reservoir, the steps of which are:
[0043] 1. On July 17-18, 2013, fish resources in the reservoir were detected using hydroacoustics and multi-mesh composite gillnets in Yudong Reservoir, Zhaotong, Yunnan;
[0044] 2. Divide the reservoir into four areas: head, middle, tail and tributary (tributary 1, head 2, middle 3, tail 4), and the area of each division is s 1 = 67.3 ha, s 2 =853.7ha,s 3 = 142.3 ha and s 4 =279.7ha, conduct hydroacoustic detection in various areas, and use multi-mesh composite gillnets for fish sample collection;
[0045] 3. Statistically count the species, quantity, body length and weight of the catches of multi-mesh compound gillnets in each division, calculate the proportion of different fish in each division, and the average weight of fish w ‾ 1 = 0.00062 kg , ...
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Abstract
The invention discloses a reservoir fish resource acoustics investigation method. The method comprises the steps that (1), multi-mesh combination gill nets are designed; (2), the length of cruising paths is designed; (3), the cruising paths are designed; (4), net points are designed and laid, water surface sub-areas are designed, and the multi-mesh combination gill nets are laid in all the sub-areas; (5), underwater acoustics data are collected, and acoustics evaluation data of a reservoir fish resource are obtained; (6), fish samples are collected, the multi-mesh combination gill nets are laid in all the sub-areas before the sun sets, and statistics is carried out on the species, the body length, the body mass, the quantity and the proportion of catches in all the sub-areas; (7), the reservoir fish resource is evaluated comprehensively, and the underwater acoustics evaluation data and fish sample data are combined for obtaining a result of the reservoir fish resource. The effects of path planning and fish sample collecting in the acoustics investigation of the reservoir fish resource are achieved; the reliable basis is provided for reasonable utilization and management of the reservoir fish resource, and the condition of the reservoir fish resource is evaluated efficiently and fast.
Description
technical field [0001] The invention belongs to the technical field of fishery resources assessment, and more specifically relates to an acoustic investigation method for fish resources in a reservoir. Background technique [0002] China has a large number of reservoirs with vast water areas and huge water bodies. Reservoir fishery is an important part of China's freshwater fishery. However, due to the deep water and complex topography of most reservoirs, it is very difficult to assess fish resources. Conventional fish resource survey methods mostly use trawls and gillnets, which is time-consuming, laborious, inefficient, and will affect fish resources. It causes great damage and is not conducive to the rational utilization and management of fishery resources. Therefore, it is particularly important to conduct low-damage, efficient and quick assessment of fish resources in reservoirs. [0003] Underwater acoustics studies the occurrence, propagation, reception and communic...
Claims
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