. Commercial fisheries review. Fisheries; Fish trade. 34 is coupled to a pressure-activated switch, battery power is conserved, and the radio may operate for a day or longer. The free vehicle is located with a radio direction finder (RDF). Standard RDF units are not able to sense a direction because of their power and frequen- cy. A high-sensitivity portable unit, or a large directional citizens band antenna, must be used. A handling line (50 ft. long) is attached to the two floats, with a third float attached to the other end. This expedites hauling the mast assembly aboard before the fishing


. Commercial fisheries review. Fisheries; Fish trade. 34 is coupled to a pressure-activated switch, battery power is conserved, and the radio may operate for a day or longer. The free vehicle is located with a radio direction finder (RDF). Standard RDF units are not able to sense a direction because of their power and frequen- cy. A high-sensitivity portable unit, or a large directional citizens band antenna, must be used. A handling line (50 ft. long) is attached to the two floats, with a third float attached to the other end. This expedites hauling the mast assembly aboard before the fishing gear is encountered. The vertical set line is situ- ated below the third float. This can consist of 30-60 hooks (8-0 or 9-0) spaced about 1- or 2 -meter intervals on plastic leaders (a foot or 2 long), a hookline with a trap above and below hooks (see fig. 1), or a string of traps in series. We have used successfully 8 traps spaced at intervals of 8-10 feet. Elliptical Traps Elliptical traps have proved excellent for catching fish and bottom creatures. These traps are manufactured by Fathoms Plus, a San Diego company, and have the following advantages over traditional metal lobster traps: (l)they are made of black plastic and so are impervious to water, rust, electroly- sis, rot, and marine borers; (2) they can be rested in stable stacks to conserve space aboard boat; and (3) as organisms sense the bait, they constantly move closer to it from any direction. The trap is made from high- densitvpolyethylene and measures 40" by 3" by 14' . The bait containers (12" by ;) can be removed from traps and stored separately. A release mechanism is located between bottom hook or trap and weights. We have used 2 types of releases made of magnesium: wire-plier and magnesium-rod. The wire-plier type is excellent for short- term sets (3 to5 hours). The pliers are sus- pended from set line (fig, 2), and a short piece ofjg" magnesium wire is clamped between the two h


Size: 894px × 2795px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., book, bookcentury1900, booksubjectfisheries, booksubjectfishtrade