Device for collecting fish samples in sea grass bed

Abstract

The invention discloses a device for collecting fish samples in a sea grass bed. The device is made of nylon net materials, can be used for collecting the fish samples in a sea grass bed ecological system, and has the characteristics that portability and labor saving are achieved, operation is convenient, and the resource quantity can be quantitatively estimated. The device for collecting the fishsamples in the sea grass bed is composed of a net bag, a string bag, floating balls, lead blocks, a floating line, traction rods and the like. The floating line has the fixed length, so that the seasweeping area is conveniently calculated and investigated. The device for collecting the fish samples in the sea grass bed has the working principles that the device is placed in the sea grass bed, and the net bag and the string bag are opened, so that the floating line on two wings is parallel to a shoreline; two persons tightly hold the traction rods to keep the traction rods perpendicular to the ground, and the device is slowly dragged to a shore at a constant speed; the two wings are closed up while the device is dragged at the shallow water position of the shore; and the net bag is shakenafter the two wings are closed up, the samples are concentrated at the string bag, a net opening at the bottom is unfastened, and the samples are collected.

Description

technical field [0001] The invention relates to an important collection tool for seagrass bed fish investigation and research, in particular to a seagrass bed fish sample collection device. Background technique [0002] Seagrass bed ecosystems are highly productive ecosystems in coastal waters. Although they only account for 0.15% of the global ocean area, they contribute 1% of the net primary productivity of the global ocean. In recent years, due to the decline of offshore fishery resources, the function of seagrass beds to provide food sources and shelters for fish has been paid more attention. However, affected by human activities and global climate change, since the 1980s, the global seagrass bed area has increased by 110km per year. 2 speed disappears. Globally, seagrass beds are fragmented and patchy, leading to a decline in seagrass resources and threatening the habitat of fish in seagrass beds. However, research on the biological conservation function of seagrass ...

AI Technical Summary

Problems solved by technology

[0006] (1) The pelagic fish and bottom fish in the seagrass bed cannot be collected at the same time;

[0007] (2) The sweeping area cannot be estimated, and the sample diversity and resource amount cannot be quantitatively estimated;

[0008] (3) The net gear is customized in a fixed position, the sample collection is passive and the collection range is greatly limited;

[0009] (4) It is more harmful to fish, and it is difficult to obtain live samples

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