Marine scoopers for porpoises and tuna - porpoise-escape-way

摘要

A barge or skiff equipped with a pair of (water tight) 7- shaped hollow arms pivotally attached to the bow sides and operated to free tuna- herding porpoises from a tuna seine enclosure and snatch and scoop up fish, a retrieval net being extended between slidable extensions of the arms. Porpoises can be steered out of the enclosure primarily after lowering any section of the cork-line with weights, cable lifted by chase boats to prevent fish escape. The arms are retracted by coil springs tho pivoted down and extended by hydraulic jacks inside the springs. Giant arms with pivotal forearms can be mounted on stern cutouts or recesses of tuna purse-seiners and operated to handle the cork-line, let out porpoises, bag a catch by buoyancy, scoop up some or most fish and some mammals from a full size enclosure or purse and dump them onto deck, the seine to be pulled in intermittently over the stern between the (held up and/or extended) arms the unshrunken purse having less bends to entangle porpoises. Perhaps the purse or seine and skiff can be done away with and rounded up, bait attracted tuna scooped up from open sea or bottomless enclosure.