1935 extinctin possible difficulty raising grayling
Discovery of Tiny Water Flea Blocks Threatened Extinction of Grayling in State Streams LIBBY, MONT., Sept. 7—(Af) — Terminating a long though successful successful series of experiments, Elmer Phillips, Montana Superintendent of fisheries, announced here today that threatened extinction of gray- lintf might be definitely obivaicd with the discovery of a proper food upon which Uie specie of fish cun be nurtured after artificial propagation. propagation. His conclusions, ba.sed on many months of experiments in the Libby fish hatchery, are expected to solve a problem long under the scrutiny of fish ctilturisUs. The long-sought food Is microscopic microscopic water flea known scientifically scientifically as "Paphnia". The full grown bug is only about halt as large as a pin head but '• size has been no handicap to I experiments. Because the adult bug is too large for small grayling to feed upon, the catch is run through a i separator and only the smaller ones i are used to nulure the tiny fish until they attain a size permitting liberation in lakes and streams. Phillips followed his feeding experiments experiments through a magnifying I glass In troughs in the Libby hatchery and is confident that the solution will permit propagation on an extensive scale. A careful ! count, he said, showed that 97 per ! cent of grayling fry were raised to i fingerling size.