A production method for a headline sonar cable characterized by steps of: a. providing a first strength member (14); b. coupling to strength member (14) a conductor (122); c. forming a layer of polymeric material about the combination of strength member (14) and conductor (122) while ensuring that the conductor remains slack; d. forming a flow shield around the layer of polymeric material, thus forming an elongatable internally located conductive structure; and e. braiding a strength-member jacket layer (52) of polymeric material around the elongatable internally located conductive structure while ensuring that the conductor is slack when surrounded by the jacket layer (52). For another embodiment, an optical fibre is wrapped around the exterior of the layer of polymeric material within which is enclosed a braided conductor formed about the first strength member (14). Other embodiments employ further thermo-plastic layers and further sheaths and further conductors.

A production method for a headline sonar cable characterized by steps of: a. providing a first strength member (14); b. coupling to strength member (14) a conductor (122); c. forming a layer of polymeric material about the combination of strength member (14) and conductor (122) while ensuring that the conductor remains slack; d. forming a flow shield around the layer of polymeric material, thus forming an elongatable internally located conductive structure; and e. braiding a strength-member jacket layer (52) of polymeric material around the elongatable internally located conductive structure while ensuring that the conductor is slack when surrounded by the jacket layer (52). For another embodiment, an optical fibre is wrapped around the exterior of the layer of polymeric material within which is enclosed a braided conductor formed about the first strength member (14). Other embodiments employ further thermo-plastic layers and further sheaths and further conductors.

A harvesting device particularly suited for harvesting artemia cysts. The invention in its various embodiments comprises a frame and a net coupled to the frame. The frame can include a front support frame, a rear support frame and a sledding frame. A net having a first end and a second end can be secured to the front and rear support frames respectively. In certain embodiments, the net has an aspect ratio or 4:1. One or more skids can be coupled to the frame. In certain embodiments, the skids are coupled to the sledding frame. In yet other embodiments, the skids are coupled to the sledding frame at substantially the joining of the front support frame and the sledding frame. The second end of the net can be attached to a conduit in communication with a harvest vessel by a coupling. The harvest vessel can include one or more dewatering stations in communication with the conduit.

A device mounted to a vessel for harvesting a subsurface concentration of artemia cysts. In certain embodiments, the device includes a vertically adjustable front net support, a vertically adjustable rear net support and a net having a first end secured to the front net support and a second end secured to the rear net support. A conduit can be coupled to the second end of the net whereby the concentrated artemia cysts are drawn from the second end of net to a processing destination. In certain embodiments, the net has an aspect ratio of at least approximately 4:1. The processing destination could be the vessel or some other destination. In certain embodiments, the vessels are equipped with a dewatering station to which the concentrated cysts are directed for further processing. In some embodiments, the net is secured to a frame which is in turn coupled to the front net support. The front net support can include one or more arms. In certain embodiments, the front net support includes a brace which can be attached to the vessel. The brace can include one more sleeves that correspond to the one or more arms and be hingedly attached to the vessel.

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 bag having an elongated body and opposite end portions is disclosed. The body has a sidewall that provides the body with a primary opening. The body has an interior region sized for containing crab bait inserted into the interior region via the primary opening. The interior region, bounded by the sidewall, includes a plurality of secondary openings that range from about 1 mm to about 10 mm for attracting at least one crab to the body to feed on the bait contained within the interior region. The body includes a slidably openable and closeable slide fastener which overlays the primary opening and is fixed to the sidewall between the body opposite end portions. The slide fastener, when open, enables bait to be inserted into the interior region and, when closed, retains bait within the interior region.

A bag having an elongated body and opposite end portions is disclosed. The body has a sidewall that provides the body with a primary opening. The body has an interior region sized for containing crab bait inserted into the interior region via the primary opening. The interior region, bounded by the sidewall, includes a plurality of secondary openings that range from about 1 mm to about 10 mm for attracting at least one crab to the body to feed on the bait contained within the interior region. The body includes a slidably openable and closeable slide fastener which overlays the primary opening and is fixed to the sidewall between the body opposite end portions. The slide fastener, when open, enables bait to be inserted into the interior region and, when closed, retains bait within the interior region.

A catch handling system includes a catch collection system. The catch collection system includes one catch handling depot; one or more trawls; and a catch transport system, where the catch transport system includes a transport system, and where the transport system includes a transport node. The transport node includes a releasable connection to a catch handling fleet carrier drone and to one or more units of a catch handling fleet.

A catch handling system includes a catch collection system. The catch collection system includes one catch handling depot; one or more trawls; and a catch transport system, where the catch transport system includes a transport system, and where the transport system includes a transport node. The transport node includes a releasable connection to a catch handling fleet carrier drone and to one or more units of a catch handling fleet.

A gate mechanism (20) is adapted for mounting within the extension (4) of a trawl net (1), the gate mechanism comprising a turbine (47/147/247) for powering rotation of the gate mechanism as it is dragged through the water within the trawl net.