. Bulletin. Natural history; Natural history. September, 1969 Bennett et al.: Largemouth Bass in Ridge Lake held by the biologist during each fishing period. Thus it was possible to collect information on the time spent in fishing; the catch in kinds, numbers, and weights; and the types of baits used. No re- strictions were placed on baits, but if live minnows were brought to the lake, the biologist inspected them to forestall the escape of any carp, goldfish, or other undesirable species. Tliis method of taking a creel census gave a complete record of the time spent in fishing and the fishes
. Bulletin. Natural history; Natural history. September, 1969 Bennett et al.: Largemouth Bass in Ridge Lake held by the biologist during each fishing period. Thus it was possible to collect information on the time spent in fishing; the catch in kinds, numbers, and weights; and the types of baits used. No re- strictions were placed on baits, but if live minnows were brought to the lake, the biologist inspected them to forestall the escape of any carp, goldfish, or other undesirable species. Tliis method of taking a creel census gave a complete record of the time spent in fishing and the fishes caught. Signs on the lake dam and on the park roads warned that the lake was closed to fish- ing except from boats in this specific summer period, and it is believed that very little poaching took place. DRAINING CENSUSES A description of the method used in making a draining census at Ridge Lake was given in an earlier bulletin (Ben- nett 1954a: 231-236). In the 1956 cen- sus a Wolf-type weir (Wolf 1951) built in the drain tunnel opening on the down- stream side of the dam replaced the permanent vertical screen supported by concrete uprights and located about 15 meters below the oudet. Tlie Wolf-type weir is an open-end box frame that is secured with its open end upstream in the lake outlet tunnel (Fig. 2). Tlie sloping bottom of this frame as well as its sides are covered with 25-mm mesh hardware cloth, allowing a flow of water through its bottom as well as its sides. Water falls through the weir bottom by gravity. This arrangement is much more efficient in passing water than a vertical screen and much less likely to become clogged with leaves and debris. Fishes entering the weir with the water were deposited on the sloping. Fig. 2.—-Body of the Wolf-type weir that fits in the outlet tunnel on the down stream side of the Ridge Lake dam. A wire mesh covered holding box (not shown) fits tightly against the open end of the weir [held by the biologist) and extends down into the
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
