422 
PACIFIC SCIENCE, Vol. XXI, July 1967 
more extensive in "coastal” populations than in 
"inland” populations. 
9. The empirically determined, average nat- 
ural spawning temperature of C. asper is from 
8° to 13° C for both "coastal” and "inland” 
populations. Within this range of temperature, 
egg deposition begins in February in the south 
of the distributional range and progresses north- 
ward until July. 
10. The existence of catadromous "coastal” 
populations and nonmigratory "inland” popu- 
lations is indicative of genetic distinction be- 
tween them. This contention is further strength- 
ened by the existence of parallel differences in 
morphology, physiology, and geographic dis- 
tribution. 
ACKNOWLEDGMENTS 
The Research Division of the British Colum- 
bia Fish and Game Branch provided financial 
support during the summer of I960 and also 
the much appreciated and entertaining assistance 
of Dr. G. F. Hartman and Mr. C. A. Gill in 
the field studies. The Vancouver Public Aquar- 
ium provided research space for life history 
studies and I wish to thank the Curator and 
staff for their help and kindness. Almost every 
graduate student enrolled in the Institute of 
Fisheries volunteered assistance in field collec- 
tions at one time or another during the period 
1960-1 963. I offer collective thanks to all. 
REFERENCES 
Bohn, A., and W. S. Hoar. 1965. The effect 
of salinity on the iodine metabolism of coastal 
and inland prickly sculpins, Cottus asper 
Richardson. Can. J. Zool. 43(1965) :977- 
985. 
Hunter, J. G. 1959. Survival and production 
of pink and chum salmon in a coastal stream. 
J. Fish. Res. Bd. Can. 16(6) :835-886. 
Krejsa, R. J. 1965. The Systematics of the 
Prickly Sculpin, Cottus asper : An Investiga- 
tion of Genetic and Non-genetic Variation 
within a Polytypic Species. Unpublished 
Ph.D. thesis, Univ. British Columbia, June, 
1965. 109 pp. 
McAllister, D. E., and C. C. Lindsey. 1959. 
Systematics of the freshwater sculpins ( Coi- 
tus ) of British Columbia. Nat. Mus. Can. 
Contr. Zool., Bull. 172:66-89. 
Pritchard, A. L. 1936. Stomach content anal- 
yses of fishes preying upon the young of 
Pacific salmon during the fry migration at 
McClinton Creek, Masset Inlet, British Co- 
lumbia. Can. Field-Naturalist 50(6) : 104— 
105. 
Shapovalov, L., and A. C. Taft. 1954. The 
life histories of the steelhead rainbow trout 
(Salma gairdneri gairdneri) and silver sal- 
mon (Oncorhynchus kisutch ) . Calif. Dept. 
Fish and Game, Fish Bull. 98:1-375. 
Sumner, F. H. 1953. Migrations of salmonids 
in Sand Creek, Oregon. Trans. Am. Fish. 
Soc. 82(1952) :139-150. 
Taft, A. C. 1934. California steelhead experi- 
ments. Trans. Am. Fish. Soc. 64(1933) :248- 
251. 
ADDENDUM 
Since this manuscript was submitted for pub- 
lication, Mr. Gerald D. Taylor has presented 
an excellent statistical analysis of experimental 
field and laboratory studies on the interrelation- 
ships of Cottus asper and C. aleuticus in the 
Little Campbell River. 1 His thesis forms a 
valuable contribution to our present knowledge 
of sculpin ecology. Most of his conclusions ex- 
pand and elaborate upon many of the observa- 
tions reported above. However, his study opens 
up the possibility that some of the prickly 
sculpins in the Little Campbell River do not 
spawn in the lower estuarine portion of the 
stream but upstream "in close proximity to 
spawning C. aleuticus 
In other nearby coastal streams where stream 
profiles are different, I have collected reproduc- 
tively active C. asper and C. aleuticus in close 
proximity, but never have I done so in the 
Little Campbell River. I am skeptical of Taylor’s 
statement primarily because his collections were 
carried out only during 5 months (of a 7 -month 
period: August to November, 1965, and Febru- 
ary, 1966), all of which are outside the normal 
spawning season of most C. asper as documented 
above. Taylor’s study will be given more con- 
sideration in a future report on the behavior 
of C. asper and C. aleuticus. 
1 Taylor, G. D. 1966. Distribution and Habitat 
Responses of the Coastrange Sculpin ( Cottus aleu- 
ticus) and Prickly Sculpin ( Cottus asper ) in the 
Little Campbell River, British Columbia. Unpublished 
M.S. thesis, Department of Zoology, University of 
British Columbia (December, 1966). 
