SHETTER, D. S. 1937. Migration, growth rate, and population density of brook trout in the north branch of the Au Sable River, Michigan. Trans. Am. Fish. Soc. 66:203-210. , AND A. S. HAZZARD. 1939. Species composition by age groups and stability of fish populations in sections of three Michigan trout streams during the summer of 1937. Ibid. 68:281-302. , AND J. W. LEONARD. 1943. A population study of a limited area in a Michigan trout stream, September, 1940. Ibid. 72:35-51. SHUCK, H. A. 1945. Survival, population density, growth, and movement of the wild brown trout in Crystal Creek. Ibid. 73:209230. SIMON, J. R., AND R. C. BROWN. 1943. Observations on the spawning of the sculpin, Cottus semiscaber. Copeia 1943 (1) :41-42. STEFANICH, F. A. 1952. The population and movement of fish in Prickley Pear Creek, Montana. Trans. Am. Fish. Soc. 81:260-274. TTER, D. S. 1937. Migration, growth rate, population density of brook trout in he STOUDT, J. H. 1939. A study of the migration of the wall-eyed pike (Stizostedion vitreum) in waters of the Chippewa National Forest, Minnesota. Ibid. 68:163-169. STRINGER, G. E., AND W. S. HOAR. 1955. Aggressive behavior of underyearling kamloops trout. Can. J. Zool. 33 (3) :148-160. WILKS, S. S. 1958. Elementary statistical analysis. Princeton Univ. Press, Princeton, N. J., 284 pp. WILLIAMS, G. C. 1957. Homing behavior of California rocky shore fishes. Univ. Calif. Publ. Zool. 59(7) :249-284. WINN, H. E. 1958. Comparative reproductive behavior and ecology of fourteen species of darters (Pisces-Percidae). Ecol. Monogr. 28 (2) :155-191.