A fish capture device comprises a reconfigurable member having at least one of a changeable size and a changeable shape when engaged within an inside of a mouth of a fish to retain the fish on the fish capture device. A trigger member triggers said at least one changeable size and changeable shape of the reconfigurable member. A release member substantially restores the reconfigurable member to at least one of an initial size and an initial shape for releasing the fish from the fish capture device.

A curtain of a boom for harvesting brine shrimp eggs includes mesh sections for directing a flow of water in a first direction such that an amount of the brine shrimp eggs swept under the curtain of the boom during a harvesting process is minimized and a bottom section located below the mesh sections for directing a flow of water in a second direction during the harvesting process such that debris in the water is swept under the curtain of the boom.

A curtain of a boom for harvesting brine shrimp eggs includes mesh sections for directing a flow of water in a first direction such that an amount of the brine shrimp eggs swept under the curtain of the boom during a harvesting process is minimized and a bottom section located below the mesh sections for directing a flow of water in a second direction during the harvesting process such that debris in the water is swept under the curtain of the boom.

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.

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.

In accordance with at least one aspect of this disclosure, a crustacean trap can include a cage configured to trap one or more crustaceans, and a propulsion system connected to the cage and configured to provide propulsion to the cage. In certain embodiments, the trap can include a controller configured to control the propulsion system to autonomously pilot the trap.

In accordance with at least one aspect of this disclosure, a crustacean trap can include a cage configured to trap one or more crustaceans, and a propulsion system connected to the cage and configured to provide propulsion to the cage. In certain embodiments, the trap can include a controller configured to control the propulsion system to autonomously pilot the trap.

A fishing device includes a net disposed in a body of water containing fishes and a post installed near a perimeter of the net. The post further includes a stem, a cord, and a weight. A portion of the stem is above a surface of the body of water, and the cord is slidably secured to the stem. A first end of the cord is attached to the weight, and a second end of the cord is attached to the net. The weight is configured to move from a first position to a second position upon receiving wireless communication, and the first position is higher than the second position.

A fishing device includes a net disposed in a body of water containing fishes and a post installed near a perimeter of the net. The post further includes a stem, a cord, and a weight. A portion of the stem is above a surface of the body of water, and the cord is slidably secured to the stem. A first end of the cord is attached to the weight, and a second end of the cord is attached to the net. The weight is configured to move from a first position to a second position upon receiving wireless communication, and the first position is higher than the second position.

A sweep net is for crowding fish in a fish-farming pen. The sweep net has a fine-mesh net. A collecting device is for free fish parasites in a fish pen, a system is for collecting free fish parasites in a fish pen, and a method is for calculating the effect of a treatment against an external fish parasite in which the fish is treated outside a fish pen.