. Fish populations of the wild & scenic Missouri River, Montana . Fishing surveys; Wild and scenic rivers; Fishes; Fishes. Si^Nft*. Figure 4. Boom suspended electrofishing apparatus mounted on a m aluminum boat was used for sampling fish populations in the Missouri River. fish with dip nets. The electrode system of the boat consisted of positive and negative arrays. Since the boat was intended primarily for operation with direct current, the electrode configurations were designed specifically for this operating mode. However, the electrode system was also adequate for operation in the
. Fish populations of the wild & scenic Missouri River, Montana . Fishing surveys; Wild and scenic rivers; Fishes; Fishes. Si^Nft*. Figure 4. Boom suspended electrofishing apparatus mounted on a m aluminum boat was used for sampling fish populations in the Missouri River. fish with dip nets. The electrode system of the boat consisted of positive and negative arrays. Since the boat was intended primarily for operation with direct current, the electrode configurations were designed specifically for this operating mode. However, the electrode system was also adequate for operation in the alternating current mode. The positive electrode system consisted of two anodes suspended from fiberglass booms approximately m (6 ft.) ahead of the bow of the boat. The booms were spread m (7 ft.) apart and were adjustable for height by means of pin-locked adjustments. Each anode consisted of either (1) a spherical electrode, cm (15 in.) in diameter, constructed from cm (3/8 in.) diameter copper tubing or (2) an array of 12 to 15 "dropper" electrodes clipped to a m (3 ft.) diameter aluminum support ring. The support ring provided mechanical support and an electrical connection for the droppers which actually carried the current into the water. Individual "droppers" consisted of cm (6 in.) lengths of cm (5/8 in.) diameter stainless steel tubing supported by a cm (18 in.) length of heavy gauge insulated copper wire with a 20-amp test clip to attach to the support ring. By moving a sleeve of insulating material ( cm [5/8 in.] diameter auto wire loom), exposure of the stainless steel "droppers" could be adjusted for waters of varying conductivity. The negative electrode system consisted of two cathode arrays, one mounted on each side of the boat. Each array consisted of a set of five m (4 ft.) lengths of cm (3/4 in.) diameter flexible conduit supported. Please note that these images are extracted from scan
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Keywords: ., book, bookcentury1900, bookcollectionamericana, booksubjectfishes
