. Bulletin. Natural history; Natural history. November, 1954 Bennktt: Largemouth Bass in Ridge Lake 235. Fig. 11.—Marking biuegill at Ridge Lake. Each new fish (unmarked) returned to the lake after a draining census was marked by the removal of one fin. Most bluegills live only about 4 to 5 years, and few of them appeared in more than one of the spring censuses after being marked. Many bass appeared in several censuses, because their normal life span in Ridge Lake is 8 to 10 vears. was considered sufficient to begin restock- ing the lake with the fish held in the stilling basin at the base of
. Bulletin. Natural history; Natural history. November, 1954 Bennktt: Largemouth Bass in Ridge Lake 235. Fig. 11.—Marking biuegill at Ridge Lake. Each new fish (unmarked) returned to the lake after a draining census was marked by the removal of one fin. Most bluegills live only about 4 to 5 years, and few of them appeared in more than one of the spring censuses after being marked. Many bass appeared in several censuses, because their normal life span in Ridge Lake is 8 to 10 vears. was considered sufficient to begin restock- ing the lake with the fish held in the stilling basin at the base of the surface spillway. As the fish selected for the re- stocking had not been previously proc- essed, a work station was set up on the edge of the spillway stilling basin with two large stock-watering tanks filled with clean water and supplied with aerating pumps, fig. 10. A table, measuring boards, and weighing scales were set up nearby. The fish were moved, 50 to 100 at a time, from the stilling or holding basin to one of the stock tanks; from this they were removed individually and weighed, measured, "scaled" (8 to 10 scales re- moved from side of fish below the dorsal fin), fin-clipped (or had previous fin- clip recorded), and placed in the second stock tank. When this second tank be- came crowded, the fish in it w'ere trans- ferred quickly to covered tubs on a horse- drawn sled, hauled over the darn, and replaced in the lake. No fish that appeared sluggish or emaciated, or that showed evidence of injury from its passage through the outlet valve and tunnel, was used in the restocking. On no census was there any evidence of undue mortality among the fish that were returned to the lake. Operational mortality was believed to have been rather low, because a large percentage of the marked bass returned to the lake after each census were either caught by fishermen or recaptured in sub- sequent censuses. In the 1943, 1945, and 1947 censuses, when 1-inch-mesh poultry net
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
