CN104604817B - A kind of method of entrance of Changjiang River trawl fishing ParentEriocheir sinensis - Google Patents

Abstract

A method for trawling Chinese mitten crab parent crabs in the Yangtze River Estuary, relates to a method for catching Chinese mitten crab parent crabs, using fishing boats, front crossbars, rear crossbars, trawl nets and netted bamboo pieces, characterized in that the bow of the fishing boat One front crossbar is placed horizontally, and three netted bamboo pieces are tied with a tow rope in front of the front crossbar. The netted bamboo pieces are rectangular, and the length and width are 2.5-3.0 meters and 1.5-2.0 meters respectively. Two floats are tied on the top, and two sinkers are tied on the bottom, so that the netted bamboo pieces tied to the front crossbar are suspended vertically in the water under the push of the water flow; 3 bottom trawl nets are used to catch brood crabs of Chinese mitten crab; 3 netted bamboo pieces are driven by the water flow to pull the fishing boat and trawl nets to catch brood crabs, and the rudder of the fishing boat controls the direction of advancement.

Description

A method for trawling Chinese mitten crab parent crabs in the Yangtze River Estuary

technical field

The invention belongs to a method for catching brood crabs of mitten crab sinensis.

Background technique

The Chinese mitten crabs in the Yangtze River Basin generally grow to 2 years old in rivers and lakes, and their gonads begin to develop rapidly in late September. By mid-to-late October, most of the parental crabs' gonads have developed into the fourth stage, and they leave the rivers and lakes for reproductive migration to the Yangtze River Estuary. At the end of November, parent crabs gather in the brackish waters at the junction of the Yangtze River Estuary and the shallow sea to start breeding. The female parent crabs will attach fertilized eggs to the bristles of their ventral limbs and gather in waters with higher salinity. It's basically over. At present, the main tools for fishing mitten crabs during the winter flood season in the lower reaches of the Yangtze River include ground cages, nets, and trawls. The use of these fishing tools often requires a lot of human and financial resources, especially for trawling. Running the diesel engine on board for a long time will result in higher fuel costs and lower fishing benefits. In addition to diesel and other chemical raw materials as the conventional source of power for fishing boats, in recent years people have gradually adopted solar energy, wind energy, etc. to provide power sources for fishing boats in order to reduce fuel costs, but most of these devices are expensive and the size of the devices required to drive fishing boats is large , so it is difficult to apply to small fishing boats. Therefore, by inventing a kind of simple and convenient device and method, it is a better solution to utilize the huge current of the Yangtze River Estuary as power to drive the fishing boat.

Contents of the invention

The technical problem solved by the present invention is to provide a method for trawling parent crabs by means of the flow power of the Yangtze River Estuary, providing a simple and feasible technology for parent crab fishing, saving time, labor, fuel and cost, and improving economic benefits.

The technical scheme of the present invention adopts a fishing boat, a front crossbar, a rear crossbar, a trawl net and netted bamboo pieces, and is characterized in that a front crossbar is horizontally placed on the bow of the fishing boat, and three netted bamboo pieces are tied with a tow rope in front of the front crossbar. The netted bamboo slices are rectangular, and the length and width are 2.5-3.0 meters and 1.5-2.0 meters respectively. Each netted bamboo slice is tied with 2 floats on the top and 2 sinkers on the bottom, so that it can be tied to the front cross bar. The net-shaped bamboo pieces on the boat are suspended in the water vertically under the promotion of the water flow; a rear crossbar is placed horizontally at the stern of the fishing boat, and 3 bottom trawl nets are tied to catch the parent crabs of Chinese mitten crabs; the 3 net-shaped bamboo pieces Driven by the current, the fishing boat and trawling net are pulled to catch crabs, and the stern rudder of the fishing boat controls the direction of advancement.

The outstanding feature of the present invention is that the fishing boats and trawl nets are pulled by the Yangtze River water flow through the net-shaped bamboo pieces, which saves time, labor, fuel, and high economic benefits. Moreover, the materials of the fishing method are simple and easy to obtain, and fishermen can make them by hand. Effect.

Description of drawings

Fig. 1 is a kind of schematic diagram of trawling in the Yangtze River Estuary to catch the brood crab of Chinese mitten crab;

detailed description

Embodiment 1: Equipped with fishing boat 2, front crossbar 5, rear crossbar 3, trawl net 1 and netted bamboo slices 4, 1 front crossbar is placed horizontally on the bow of the fishing boat, and 3 nets are tied with tow rope 7 in front of the front crossbar Bamboo strips, the netted bamboo strips are rectangular, the length and width are 3.0 meters and 2.0 meters respectively, each netted bamboo strip is tied with 2 floats 8 above, and 2 sinkers 6 are tied at the bottom, through the float and sinker The configuration is such that the net-shaped bamboo pieces tied to the front crossbar can just be vertically suspended in the water under the promotion of the water flow, so that the fishing boat can be driven by these net-like bamboo pieces to drive the fishing boat to move fast, and the stern rudder of the fishing boat Control the direction of advancement; a rear crossbar is placed horizontally at the stern of the fishing boat, and three bottom trawl nets are attached to the rear crossbar to catch Chinese mitten crab parent crabs. As a crustacean, Chinese mitten crab swims and crawls slowly at the bottom of the water, and the water flow speed in the Yangtze River Estuary is much faster than the crawling speed of parent crabs. Therefore, fishing parent crabs by this method every day can save a lot of diesel oil. Thereby greatly improving the economic income of fishermen, and can be popularized and applied in the waters of the Yangtze River Estuary.

Embodiment two: according to the implementation mode of embodiment one, the length of netted bamboo slice can be shortened to not less than 2.5 meters, and the width can be shortened to not less than 1.5 meters.

Claims (1)

1. a method for entrance of Changjiang River trawl fishing ParentEriocheir sinensis, uses fishing boat, front rail, rear transverse rod, drags Net and netted bamboo chip, is characterized in that horizontal 1 front rail of fishing boat fore, with 3 nets of tow strap system before front rail Shape bamboo chip, netted bamboo chip is rectangle, and length and width are respectively 2.5-3.0 rice and 1.5-2.0 rice, each netted bamboo Bind 2 floats above sheet, bind 2 sinkers below, make the netted bamboo chip lying on front rail at current Vertically suspend in water under promotion；Horizontal 1 rear transverse rod of fishing boat stern, fastens 3 otter-trawls, is used for fishing for ParentEriocheir sinensis；3 netted bamboo chips, under the promotion of current, pull fishing boat and trawlnet to carry out parent Eriocheir sinensis and fish for, The tail vane of fishing boat controls the direction advanced.