Word: larvae
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...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...
...this cumulative process, Frey predicts, the oxygen content eventually will fall past the point-three parts oxygen to one million parts water-below which deepwater fish cannot survive. Limnologist Frey has discovered evidence of this in an increasing population of the red "blood" midge, a mosquitolike larva that can get along fine on far less oxygen than its more demanding green and brown brothers. In Douglas Lake, Frey's crew also brought up a few "phantom" midges, near-transparent larvae that can reach adult stage without any oxygen at all for long periods at a time...
Taking a leave from Caltech, Beadle went to Paris to work with Ephrussi. Their first joint experiment was the delicate feat of transplanting an eye from one minuscule fruit-fly larva to another. After many attempts, an eye took hold and lived, and the two young scientists spent a whole day of celebration at a sidewalk...
This was no mere stunt; it had a purpose-to find out whether the chemicals in one larva's body would affect the color of an eye transplanted from another larva. It did not work, but Beadle remained convinced that the innermost secrets of genetics and of life itself must be approached from the chemical angle...