. Commercial fisheries review. Fisheries; Fish trade. 22 COMMERCIAL FISHERIES REVIEW Vol. 17, No. 12 After the main eradication job was complete, careful scrutiny of the lake was made and isolated areas, apparently fresh-water seeps, which still harbored small bunches of carp, were given added treatment. Wildlife officials say that 99 barrels of rotenone toxicant were used in the 10,000-acre lake. Additional amounts were used to treat more than 100 miles of streams Carp ^ and innumerable ponds and lagoons in the area. Rotenone kills fish by affecting the gill as it is drawn through the gill wi
. Commercial fisheries review. Fisheries; Fish trade. 22 COMMERCIAL FISHERIES REVIEW Vol. 17, No. 12 After the main eradication job was complete, careful scrutiny of the lake was made and isolated areas, apparently fresh-water seeps, which still harbored small bunches of carp, were given added treatment. Wildlife officials say that 99 barrels of rotenone toxicant were used in the 10,000-acre lake. Additional amounts were used to treat more than 100 miles of streams Carp ^ and innumerable ponds and lagoons in the area. Rotenone kills fish by affecting the gill as it is drawn through the gill with the water. It does not enter the body of the fish. Fish killed by rotenone can be and are used as food by hu- iii^<^OsfJ<^jgt man beings. Malheur Lake is an important link in the Pacific Waterfowl Flyway and until the advent of the carp it was one of the finest feeding grounds in the West. Its snallow waters and broad expanse provided space and feed for hundreds of thousands of mi- gratory birds. During the past two or three years not more than ten percent of the customary numbers of ducks stopped at the lake because of the destruction of water- fowl food plants by the carp. The carp not only root up and consume sago pondweed and other aquatic plants but they so muddy the waters that sunshine cannot penetrate to stimulate growth of new plants. Malheur Lake had a maximum depth of only 14 inches at the time of the eradi- cation. In recent years waters in almost every part of the Nation have been rehabili- tated by the use of rotenone compounds. The Malheur Lake project is by far the largest as far as water surface is concerned. Two other huge projects conducted by States recently under the Federal Aid in Fish Restoration program are the Mari- as River job in northwestern Montana and the Diamond Lake project in Oregon. In each of these instances the respective States planned and executed the projects. The Marias River work was completed a few months ago. It consisted in k
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