Coitus Life History 
121 
— 8.1 mm (Bailey 1952); sac fry — 5.9 mm (Ludwig and Norden 1969). 
This striking emphasis on “quality” (larger and fewer eggs) by C. bairdi 
in northeastern Tennessee deserves further investigation in other 
southern populations to determine whether or not it is a consistent 
geographic trend. 
LITERATURE CITED 
Bailey, Jack E. 1952. Life history and ecology of the sculpin Coitus bairdi 
punctulatus in southwest Montana. Copeia 1952(4);243-255. 
Hann, Harry W. 1927. The history of the germ cells of Coitus bairdi Girard. J. 
Morphol. Physiol. 45:427-497. 
Koster, William J. 1936. The life-history and ecology of the sculpins (Cottidae) 
of central New York. Ph.D. Dissert., Cornell Univ., Ithaca. 87 pp. 
Ludwig, Gerald M., and C.R. Norden. 1969. Age, growth and reproduction of 
northern mottled sculpin {Coitus bairdi bairdi) in Mt Vernon Creek, 
Wisconsin. Milw. Public Mus. Occas. Pap. Nat. Hist. No. 2, 67 pp. 
McCleave, James D. 1964. Movement and population of the mottled sculpin 
{Coitus bairdi Girard) in a small Montana stream. Copeia 1964(3):506-513. 
Patten, Benjamin G. 1971. Spawning and fecundity of seven species of northwest 
American Coitus. Am. Midi. Nat. 55:493-506. 
Ricker, William E. 1975. Computation and interpretation of biological statistics 
of fish populations. Bull. Fish. Res. Board Can. 191, 382 pp. 
Simon, James R., and R.C. Brown. 1943. Observations on the spawning of 
the sculpin Coitus semiscaber. Copeia 1943(l):41-42. 
Sokal, Robert R., and F.J. Rohlf. 1969. Biometry. W.H. Freeman and Co., 
San Francisco. 776 pp. 
Zarbock, William M. 1952. Life history of the Utah sculpin. Coitus bairdi semi- 
scaber (Cope) in Logan River, Utah. Trans. Am. Fish. Soc. 57:249-259. 
Accepted 25 August 1980 
