. Biennial report, Montana Game and Fish Commission, State of Montana. Montana Fish and Game Commission; Game protection; Wildlife conservation; Fisheries. fytilt S&ueetUHXj, cutd PlasuUnxj, The Fish and Game Department has long realized the necessity for a clearer understanding of the problems confronting us in the relation of irrigation to fishing. In the spring of '41 a re- search program was started with the main thought in mind of bringing out the effectiveness of exist- ing fish screens and the comparative losses of trout and other fish in these ditches. In view of the limited funds,
. Biennial report, Montana Game and Fish Commission, State of Montana. Montana Fish and Game Commission; Game protection; Wildlife conservation; Fisheries. fytilt S&ueetUHXj, cutd PlasuUnxj, The Fish and Game Department has long realized the necessity for a clearer understanding of the problems confronting us in the relation of irrigation to fishing. In the spring of '41 a re- search program was started with the main thought in mind of bringing out the effectiveness of exist- ing fish screens and the comparative losses of trout and other fish in these ditches. In view of the limited funds, the survey was confined to the waters of the Yellowstone drainage and, although this area requires further investigation, the find- ings up to date bring out many pertinent facts and many of the findings can be applied to other irrigation and diversion problems elsewhere in the State. A total of over 450 irrigation diversions were found to exist on the waters of the Yellowstone drainage alone. In view of such a large number existing on one drainage, it can be safely stated that there are at least 2,000 diversions located on waters throughout the State. It was found that we have installed in the last several years a total of 29 fish screens and of this total only 3 were Oregon type fish screen with rotating- grills— still in shape to operate satisfactorily. Most of these installations averaged close to $800 each and some even more when the items of concrete work, installation, and other incidental expense were taken into consideration. It was also found that the average upkeep and maintenance cost would be approximately $150 annually. Multiply this figure by 2,000 (the number of ditches in Montana) the annual maintenance load would total $300,000, which is three times as much as is available for the operations of the Fisheries Division. What we are faced with is a more practical and economical solution to this huge problem. It cannot be denied that many drainag
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfisheries, bookyear19
