An instrumentation system for a net barrier comprising at least one tension sensor node attached to one or more threads of said net barrier is described. Also described is a sensor node, and use of this sensor node.

Netting suitable for use in aquaculture which has a half mesh size of 5-100 mm measured in accordance to ISO 1107:2017 and includes cord having a diameter of 0.5-8 mm, wherein the cord includes films of ultra-high molecular weight polyethylene, the films having a width of 0.5-10 mm. It has been found that the use of cord based on films of ultra-high molecular weight PE (UHMWPE) results in nets with improved fouling resistance compared to nets based on conventional ultra-high molecular weight gel-spun monofilament or multifilament yarn. The netting is easier to clean than netting based on conventional ultra-high molecular weight gel-spun monofilament or multifilament yarn. Not only is less frequent cleaning required due to less fouling, the cleaning steps themselves can be carried out at lower water pressure in the high-pressure cleaning apparatus. This results in less damage of the nets during cleaning and lower water consumption.

Netting suitable for use in aquaculture which has a half mesh size of 5-100 mm measured in accordance to ISO 1107:2017 and includes cord having a diameter of 0.5-8 mm, wherein the cord includes films of ultra-high molecular weight polyethylene, the films having a width of 0.5-10 mm. It has been found that the use of cord based on films of ultra-high molecular weight PE (UHMWPE) results in nets with improved fouling resistance compared to nets based on conventional ultra-high molecular weight gel-spun monofilament or multifilament yarn. The netting is easier to clean than netting based on conventional ultra-high molecular weight gel-spun monofilament or multifilament yarn. Not only is less frequent cleaning required due to less fouling, the cleaning steps themselves can be carried out at lower water pressure in the high-pressure cleaning apparatus. This results in less damage of the nets during cleaning and lower water consumption.

A drive system for a net cleaner to produce efficient propulsion without damage to the cage net. The drive system includes flexible engagement stumps protruding from a base of a driving belt with tips or studs mounted on an end of the stumps. The tips or studs engage the net and propel the net cleaner. The stumps flex to insure that, if excessive pressure is applied to a stud, the stump will bend and the net will release without damage. A guard prevents the stump from directly engaging a cage net. A track belt produces efficient propulsion without damage to the cage net. The track belt includes flexible engagement stumps protruding from a base of a driving belt with tips or studs mounted on an end of the stumps.

A net retaining system includes a base component and a head component. The base component includes a first surface, an opposite second surface, a retention member provided to the first surface and a cradle projecting from the first surface and configured to grip a net rim near a net handle. The head component includes, a first engagement member facing a first direction, a second engagement member facing a second, opposite direction and a column having first and second ends. The first and second engagement members are configured for selective coupling with the retention member of the base component. The column separates the first and second engagement members and is configured to extend through the net handle so as to resist rotation relative to the net handle.

A net retaining system includes a base component and a head component. The base component includes a first surface, an opposite second surface, a retention member provided to the first surface and a cradle projecting from the first surface and configured to grip a net rim near a net handle. The head component includes, a first engagement member facing a first direction, a second engagement member facing a second, opposite direction and a column having first and second ends. The first and second engagement members are configured for selective coupling with the retention member of the base component. The column separates the first and second engagement members and is configured to extend through the net handle so as to resist rotation relative to the net handle.

A net retaining system includes a base component and a head component. The base component includes a first surface, an opposite second surface, a retention member provided to the first surface and a cradle projecting from the first surface and configured to grip a net rim near a net handle. The head component includes, a first engagement member facing a first direction, a second engagement member facing a second, opposite direction and a column having first and second ends. The first and second engagement members are configured for selective coupling with the retention member of the base component. The column separates the first and second engagement members and is configured to extend through the net handle so as to resist rotation relative to the net handle.

A net retaining system includes a base component and a head component. The base component includes a first surface, an opposite second surface, a retention member provided to the first surface and a cradle projecting from the first surface and configured to grip a net rim near a net handle. The head component includes, a first engagement member facing a first direction, a second engagement member facing a second, opposite direction and a column having first and second ends. The first and second engagement members are configured for selective coupling with the retention member of the base component. The column separates the first and second engagement members and is configured to extend through the net handle so as to resist rotation relative to the net handle.

A net assembly used for purse seine fishery, which is mounted on a first vessel, dropped into seawater from the first vessel, and towed by a second vessel to surround and pull fish to capture fish. The net assembly includes a plurality of floats floating on a surface of seawater to provide buoyancy to the net assembly, and coupled to one another in a spaced manner in a lengthwise direction of the net assembly; a net combination of a plurality of nets disposed under the floats in an inter-coupled state, and sunken and deployed from the surface of seawater to surround and capture fish; a weight body extending along a lower end of the net combination to provide a sinking force by means of gravity to sink the net combination; and a purse wire extending along the net combination while being spaced apart from the weight body in a downward direction, and tightened by the first vessel to allow the net assembly to form a closed space below the surface of seawater.

A fishing device includes a net disposed in a body of water containing fishes. A plurality of posts, wherein each post further includes a stem, a bottom cross disposed at a lower portion of the stem; a cross bar disposed at a top end of the stem; and a cord. The stem is an upright elongated protrusion extending from under a bottom to above a surface of the body of water. The cord is slidably secured to the cross bar. A first end of the cord is secured to a weight. A second end of the cord is secured to the net. The fishing device includes a release mechanism. The release mechanism grabs a portion of the cord to hold the weight in a first position adjacent to the cross bar. A bait system is disposed at or adjacent to a center of the net.