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This paper describes the chemical techniques and procedures used by the Biological Laboratory of the U.S. Bureau of Commercial Fisheries, Galveston, Texas, for analyzing samples involved in the chemical and biological survey of the marine and estuarine waters of the Gulf of Mexico and also in the many laboratory and field studies and experiments that have been made pertaining to the red tide investigation.
Abstract: The micro method of hematocrit is rapidly replacing red cell counts in clinical hematology. Observations were made on the value of this method in routine hematological examination of trouts. Under the conditions of data collection, the normal hematocrit values for brook trout were 45 to 50, for brown trout 39 to 44, and for rainbow trout 45 to 53. There was a close correlation between the hematocrits, red cell counts and hemoglobin. The commercial heparinized capillaries, while excellent for human blood, tend to give somewhat higher readings (7 to 18 percent) with trout, due to incomplete prevention of blood coagulation. The procedure as applied to trout is described in detail.