A water pressure-activated end line severing device is configured to be attached to a lobster, crab or snow crab trawl end line and to automatically sever the end line if a large marine animal has snagged, bitten, seized, caught, become entangled with, or otherwise somehow attached itself to that end line. When any large marine animal, such as a whale, snags or becomes entangled in the end line, the normal, instinctive response of the large marine animal is to dive rapidly to a greater depth, which pulls the end line and the device attached to the end line to a greater depth in the water column. As the device descends to a greater depth in the water column, the water pressure exerted against the device rapidly increases. When the water pressure reaches and exceeds a predefined water pressure threshold, a trigger assembly on the device activates a spring-loaded cutter assembly, which forces movement of a cutting blade to sever the part of the end line that passes through an aperture in the device, thereby freeing the large marine animal from the end line and the weight of the lobster or crab trawl.

The present invention provides a catamaran centralized-transportation fishing ship and a control method, which relate to the technical field of fishing of fishing ships. The catamaran centralized-transportation fishing ship has the fishing assembly and the concave chamber for centralized transportation of fish bodies, which can simultaneously have two functions of fishing and centralized transportation, and has a wide application range. Compared with existing fishing ships for fishing operations, the fishing ship can place the caught fish bodies in the concave chamber, so that the fish bodies can be in original water quality during a transfer process, and thus a survival rate of the fish bodies is increased. Meanwhile, setting of the limiting mechanism can prevent the fish bodies from escaping and increase a fishing amount of a single fishing operation.

The present invention provides a catamaran centralized-transportation fishing ship and a control method, which relate to the technical field of fishing of fishing ships. The catamaran centralized-transportation fishing ship has the fishing assembly and the concave chamber for centralized transportation of fish bodies, which can simultaneously have two functions of fishing and centralized transportation, and has a wide application range. Compared with existing fishing ships for fishing operations, the fishing ship can place the caught fish bodies in the concave chamber, so that the fish bodies can be in original water quality during a transfer process, and thus a survival rate of the fish bodies is increased. Meanwhile, setting of the limiting mechanism can prevent the fish bodies from escaping and increase a fishing amount of a single fishing operation.

A sea vessel (1), such as a tugboat or a fishing vessel, including a hydraulic winch (10) connected to a hydraulic system (100), and at least one main engine with a main engine crankshaft (22) connected to a propeller or a thruster. The hydraulic system (100) comprising: a first, hydraulically powered genset (106) including a hydraulic motor and a generator, at least one hydraulic pump (105) connected to said crankshaft (22). The hydraulic pump (105) is configured for driving said first genset (106) to generate electricity, and the hydraulic pump (105) is configured for driving said hydraulic winch (10), and first valve element (102) are used for selectively directing hydraulic fluid to the hydraulic winch (10) or to said first genset (106) of said hydraulic system.

A sea vessel (1), such as a tugboat or a fishing vessel, including a hydraulic winch (10) connected to a hydraulic system (100), and at least one main engine with a main engine crankshaft (22) connected to a propeller or a thruster. The hydraulic system (100) comprising: a first, hydraulically powered genset (106) including a hydraulic motor and a generator, at least one hydraulic pump (105) connected to said crankshaft (22). The hydraulic pump (105) is configured for driving said first genset (106) to generate electricity, and the hydraulic pump (105) is configured for driving said hydraulic winch (10), and first valve element (102) are used for selectively directing hydraulic fluid to the hydraulic winch (10) or to said first genset (106) of said hydraulic system.

A bait net casting device for catching sea species including a housing having a reel with a retractable cord. The housing includes an opening at the top and forms a handle for holding the bait net casting device when not in use. The bait net casting device includes line strands connecting the cord via connecting rings at one end and a disk at another end. The bait net casting device includes a line coupler drawn through the line strands. The bait net casting device includes a net connecting the disk. The net includes a lead line at its circumference. The lead line includes weights circumferentially spaced in relation to another. A user draws a waist belt through the opening to connect and suspend the housing from the belt. The net casts pulling the cord from the reel. Further, the cord retracts into the housing pulling back and closing the net.

A bait net casting device for catching sea species including a housing having a reel with a retractable cord. The housing includes an opening at the top and forms a handle for holding the bait net casting device when not in use. The bait net casting device includes line strands connecting the cord via connecting rings at one end and a disk at another end. The bait net casting device includes a line coupler drawn through the line strands. The bait net casting device includes a net connecting the disk. The net includes a lead line at its circumference. The lead line includes weights circumferentially spaced in relation to another. A user draws a waist belt through the opening to connect and suspend the housing from the belt. The net casts pulling the cord from the reel. Further, the cord retracts into the housing pulling back and closing the net.

The present disclosure belongs to the technical field of fishing operation equipment in fishery, and relates to a net hauler for a trawler. The net hauler includes two rope drums, a drum rotation shaft is disposed on each rope drum and includes a first rotation shaft and a second rotation shaft, a drum is disposed on the first rotation shaft, a cylindrical housing is disposed between two ends of the first rotation shaft and the second rotation shaft, a pivot is disposed on the cylindrical housing. The present disclosure has advantages of changing a net hauling speed and improving a fishing efficiency.

The present disclosure belongs to the technical field of fishing operation equipment in fishery, and relates to a net hauler for a trawler. The net hauler includes two rope drums, a drum rotation shaft is disposed on each rope drum and includes a first rotation shaft and a second rotation shaft, a drum is disposed on the first rotation shaft, a cylindrical housing is disposed between two ends of the first rotation shaft and the second rotation shaft, a pivot is disposed on the cylindrical housing. The present disclosure has advantages of changing a net hauling speed and improving a fishing efficiency.

The present disclosure provides a trawler with a fishing and conveying device and a fishing method, and belongs to the technical field of trawlers. The trawler of the present disclosure includes a hull structure and two fishing devices, wherein the fishing device includes a first rotary rod, a second rotary rod, a fixing frame and a fish suction mechanism, the first rotary rod is hinged at the bow of the hull structure, a fishing net is connected on the first rotary rod, the second rotary rod is hinged at the stern of the hull structure. The present disclosure is capable of realizing continuous fishing and directly conveying the fish onto the trawler, and thus is simple to operate.