A hand net device that includes a yoke device having a yoke body, a basket attached to the yoke body, the basket including a net that holds an object and a hoop that attaches to the net, and a handle attached to the yoke body. The hand net device can include a load sensor that generates a weight signal that is proportional to a weight of an object in the basket.

A hand net device that includes a yoke device having a yoke body, a basket attached to the yoke body, the basket including a net that holds an object and a hoop that attaches to the net, and a handle attached to the yoke body. The hand net device can include a load sensor that generates a weight signal that is proportional to a weight of an object in the basket.

A lamp for use under water, comprising: an electrical lighting device, electrical connections for the power supply of the electrical lighting device, and a housing, wherein the housing is translucent at least in sections and defines a watertightly closable hollow space, wherein the electrical lighting device and the electrical connections are arranged within the hollow space, wherein the housing forms a mechanical shell surrounding the hollow space, the mechanical shell having a double curvature at each point of the shell; and a use of the lamp as a light bait when fishing.

A lamp for use under water having an electrical multicolor light source, electrical connections for the power supply of the electrical multicolor light source, a controller configured to control the light color emitted by the electrical multicolor light source, and a housing, wherein the housing is translucent at least in sections and defines a water tight closable hollow space, wherein the electrical multicolor light source and the electrical connections are arranged within the hollow space, wherein the housing forms a mechanical shell surrounding the hollow space, the mechanical shell having a double curvature at each point of the shell; and a use of the lamp as a light bait when fishing.

An underwater lighting system includes a light housing. The light housing includes a weighted base having a bottom surface with a bottom edge and a cover. The cover and the weighted base cooperate to define a cover interior. The cover interior is waterproof. The light housing also includes a light source positioned within the cover interior. The underwater lighting system is configured to prevent a fishing lure or cast net from snagging on the underwater lighting system.

An underwater lighting system includes a light housing. The light housing includes a weighted base having a bottom surface with a bottom edge and a cover. The cover and the weighted base cooperate to define a cover interior. The cover interior is waterproof. The light housing also includes a light source positioned within the cover interior. The underwater lighting system is configured to prevent a fishing lure or cast net from snagging on the underwater lighting system.

A seine net calibration target for an image sensor can include a given set of seine nets connected to form a polygon and another set of seine nets. Each seine net of the other set of seine nets is coupled to a vertex of the polygon at a given end and coupled to a respective one of a plurality of boats at another end. The seine net calibration target can also include a plurality of light sources arranged along a top edge of the given set of seine nets and the other set of seine nets. The plurality of light sources emits light at a predetermined wavelength.

A seine net calibration target for an image sensor can include a given set of seine nets connected to form a polygon and another set of seine nets. Each seine net of the other set of seine nets is coupled to a vertex of the polygon at a given end and coupled to a respective one of a plurality of boats at another end. The seine net calibration target can also include a plurality of light sources arranged along a top edge of the given set of seine nets and the other set of seine nets. The plurality of light sources emits light at a predetermined wavelength.

A trawl system having at least a trawl net and bridles and/or sweeplines, the trawl net having a trawl mouth opening; wings; a pliable footrope; a pliable headrope; and pliable sidelines, the bridles and/or sweeplines having a forward bridle point as well as having upper and lower bridles and/or sweeplines, the trawl system includes light sources illuminating space between the upper and lower bridles and/or sweeplines with visible light.

A trawl system having at least a trawl net and bridles and/or sweeplines, the trawl net having a trawl mouth opening; wings; a pliable footrope; a pliable headrope; and pliable sidelines, the bridles and/or sweeplines having a forward bridle point as well as having upper and lower bridles and/or sweeplines, the trawl system includes light sources illuminating space between the upper and lower bridles and/or sweeplines with visible light.