. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. ELECTRIC FENCE 495 5. Experimental squirrel populations were not disseminated or dis- turbed by nonavian predators. 6. Squirrels were prevented from mip'rating into experimental fields from surrounding untreated areas. THE ELECTRIC FENCE AS A BARRIER TO RATS Rattus rattits ratfus Linnaeus, Edttxf; norvegicns Erxleben, albinos and hybrids were trapped from a local dump and used as experimental animals. Eighteen rats were confined in a
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. ELECTRIC FENCE 495 5. Experimental squirrel populations were not disseminated or dis- turbed by nonavian predators. 6. Squirrels were prevented from mip'rating into experimental fields from surrounding untreated areas. THE ELECTRIC FENCE AS A BARRIER TO RATS Rattus rattits ratfus Linnaeus, Edttxf; norvegicns Erxleben, albinos and hybrids were trapped from a local dump and used as experimental animals. Eighteen rats were confined in a pen 15 feet square for a continuous period of 24 hours; none escaped. This experiment was re- peated twice with the same results. Construction of this electric and wire netting fence was similar to that of the squirrel pens. Principal differences were: (1) One foot of the wire netting was turned inward horizontally at the ground level. A light covering of earth held down and covered the turned-in lower edge. (2) Eight inches of netting along the top of the fence was turned inward horizontally with two additional inches turned down vertically on the inner edge of the overhang. (3) An electric wire was placed in the center of the overhang instead of at the edge as in the squirrel pens. Two electric wires were attached to perpendicular sections of the fence as shown in Figure 6. Few rats were successful in climbing over the. FIGURE 6. Rats trapped from a dump are retained below the lowest of three electrically- charged aluminum wires. The rats soon became conditioned and were careful not to come in contact with the charged Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and Game. [San Francisco, etc.
Size: 1790px × 1396px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcaliforniadeptoffishandgame, bookauthorcaliforniafish
