It is provided an Antarctic Krill trawl with a centralized sinker and a self-expandable mouth structure, including a beam, an upper border rope, a lower border rope, a lateral line, a cover net, a flank net and a body net. A length of the beam is 18 to 20 meters. The beam enables the mouth to be expanded horizontally, a sinker is provided at each of two sides of a belly net at a front end of a first mouth of the body net. A component force of a sinking force by the sinker is transmitted through the lateral line and a sewing edge so as to cause the lower border rope in a tensioning state due to the transmitted force. The body net comprises a back net, a lateral net and a belly net. Taper ratios of the back net and the lateral net are 2-1.

A harvesting mechanism for a fishing device includes an actuator, a wireless receiver for receiving a wireless signal to control the actuator, and a rope securing mechanism mechanically coupled to the actuator. The rope securing mechanism secures a rope. In response to receiving the wireless signal, the wireless receiver activates the actuator to cause the rope securing mechanism to release the rope.

A harvesting mechanism for a fishing device includes an actuator, a wireless receiver for receiving a wireless signal to control the actuator, and a rope securing mechanism mechanically coupled to the actuator. The rope securing mechanism secures a rope. In response to receiving the wireless signal, the wireless receiver activates the actuator to cause the rope securing mechanism to release the rope.

A rope releasing apparatus includes an actuator, a wireless receiver for receiving a wireless signal to control the actuator, and a rope securing mechanism mechanically coupled to the actuator. The rope securing mechanism secures a rope. The rope is attached to a fishing net. In response to receiving the wireless signal, the wireless receiver activates the actuator to cause the rope securing mechanism to release the rope.

A rope releasing apparatus includes an actuator, a wireless receiver for receiving a wireless signal to control the actuator, and a rope securing mechanism mechanically coupled to the actuator. The rope securing mechanism secures a rope. The rope is attached to a fishing net. In response to receiving the wireless signal, the wireless receiver activates the actuator to cause the rope securing mechanism to release the rope.

A rope releasing apparatus includes an actuator, a wireless receiver for receiving a wireless signal to control the actuator, and a rope securing mechanism mechanically coupled to the actuator. The rope securing mechanism secures a rope. The rope is attached to a fishing net. In response to receiving the wireless signal, the wireless receiver activates the actuator to cause the rope securing mechanism to release the rope.

An arrangement for remotely controlling the position of a trawl door (1) or deflector for seismic surveys comprises an attachment point provided on a movable part (10). The movable part (10) can be moved in relation to a body of the trawl door (1) by means of a remotely controlled actuator. The movable part (10) with the attachment point (15) for a towing line is provided at the body or at a centre rib of the body of the trawl door (1). The movable part (10) with the attachment point can be moved substantially in vertical direction and approximately at right angles in relation to the direction of movement of the trawl door (1) when operated at sea, thereby resulting in an upwards or downwards movement of the trawl door (1) and thereby providing continuous adjustment of depth at which the trawl door (1) operates in the water.

An arrangement for remotely controlling the position of a trawl door (1) or deflector for seismic surveys comprises an attachment point provided on a movable part (10). The movable part (10) can be moved in relation to a body of the trawl door (1) by means of a remotely controlled actuator. The movable part (10) with the attachment point (15) for a towing line is provided at the body or at a centre rib of the body of the trawl door (1). The movable part (10) with the attachment point can be moved substantially in vertical direction and approximately at right angles in relation to the direction of movement of the trawl door (1) when operated at sea, thereby resulting in an upwards or downwards movement of the trawl door (1) and thereby providing continuous adjustment of depth at which the trawl door (1) operates in the water.

An arrangement for remotely controlling the position of a trawl door (1) or deflector for seismic surveys comprises an attachment point provided on a movable part (10). The movable part (10) can be moved in relation to a body of the trawl door (1) by means of a remotely controlled actuator. The movable part (10) with the attachment point (15) for a towing line is provided at the body or at a centre rib of the body of the trawl door (1). The movable part (10) with the attachment point can be moved substantially in vertical direction and approximately at right angles in relation to the direction of movement of the trawl door (1) when operated at sea, thereby resulting in an upwards or downwards movement of the trawl door (1) and thereby providing continuous adjustment of depth at which the trawl door (1) operates in the water.

A commercial fishing trawl has a net and a mouth opening defined by a head line, a foot line, and side lines. The mouth opening is spread by a plurality of foil segments threaded on one or more of the head line, foot line, or side lines. Foil segments may also be threaded on tag lines or foil lines attached about the mouth opening to spread and maintain the mouth opening as the trawl is towed through the water, behind a tow vessel.