Word: fishing
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Dates: during 1960-1969
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...company that cooperated very closely with the U.S. Fish and Wildlife Service in destroying lampreys that almost killed the fish life from Erie to Superior, we find your article [July 13] up to date and most interesting. May we mention that the one chemical, 3-trifluormethyl-4-nitrophenol, invented by Farbwerke Hoechst of Germany, which did the trick-out of 6,000 chemicals unsuccessfully used-was given by us to the U.S. Fish and Wildlife Service. We are naturally proud of this international cooperation. G.I.O. RUEBCKE President Hostachem Corp. Mountainside...
Lively Larva. Lampreys prefer the larger fish, especially the tasty lake trout, which are also favorites of human gourmets. Lake by lake, as the lampreys advanced the trout disappeared. In 1935 the Lake Huron commercial catch was 6,000,000 lbs.; by 1945 it had dropped below 1,000,000 lbs. Later it fell to almost nothing. In Lake Michigan the story was the same. In Lake Superior, last lake to be invaded, the trout catch fell from...
First countermeasure tried by the fishes' human allies was electrical barriers across stream mouths to keep mature lampreys from swimming upstream to spawn. But many streams were already packed with growing larvae from lamprey eggs, so the U.S. Fish and Wildlife Service and the Canadian Department of Fisheries decid ed to destroy the larvae themselves. In search of a selective lamprey-larva poison, they tried more than 6,000 different chemicals on jars containing two lamprey lar vae, two bluegill fingerlings and two small rainbow trout. Some chemicals killed nothing; some killed both larvae and fish. Some killed...
...battle of the lakes is far from over, but the Fish and Wildlife Service is now hopeful of eventual victory. It has already started TFM treatment in streams that flow into Lake Michigan and Huron. As soon as each lake is reasonably safe, the service will release baby trout, confident that most of them will not be sucked to death by lampreys...
...mono-unsaturated if hydrogen atoms are missing at one point in the chain, and as polyunsaturated if they are absent at two or more points. Most saturated fats are solid at room temperature, and come from meat or milk. The polyunsaturated fats, notably linoleic acid, are found mainly in fish, marine mammals, and such plant extracts as safflower, sunflower, cottonseed, soybean, corn and peanut oils. Only ten years ago, safflower oil was made mostly from imported seed for use in dyes. Today, hundreds of thousands of acres in California, Arizona and Utah grow the thistlelike plant...