10 20 30 10 20 30 10 20 30 10 20 30 10 20 30 10 20 30 10 20 30 10 20 30 10 20 30 10 

 Aof Mdv Ju" Jul Au(| Se|» Oct Nov Dec 



Figure 2. — First year growth of walleye and water temperature 

 at John Day Dam on the Columbia river, 1979. Growth cui-ve 

 fitted by inspection (171 fish represented). Each point on the 

 growth curve is the arithmetic mean of 3 to 12 specimens. 



Raymond, h. l. 



1979. Effects of dams and impoundments on migrations of 

 juvenile chinook .salmon and steelhead from the Snake 

 River, 1966 to 1975. Ti-ans. Am. Fish. See. 108:505-529. 

 SCOTT, W. B., AND E. J. GROSSMAN. 



1973. Fre.sh water fishes of Canada. Fish. Res. Board 

 Can., Bull. 966 p. 

 SMITH, L. L., JR., AND R. L. PYCHA. 



1960. First-year growth of the walleye, Stizostedion 

 I'itreum vitreum (Mitchill), and associated factors in the 

 Red Lakes, Minnesota. Limnol. Oceanogr 5:281-290. 

 WOLFERT, D. R. 



1977. Age and growth of the walleye in Lake Erie, 1963- 

 1968. Trans. Am. Fish. Soc. 106:569-577. 



DEAN A. BREGE 



Northwest and Alaska Fisheries Center Coastal Zone and 



Estuarine Studies Division 

 National Marine Fisheries Service, NOAA 

 2725 Montlake Boulevard East 

 Seattle, WA 98112 



populations by the increasing abundance of wall- 

 eye indicates a continuing need for monitoring 

 walleye in this section of the Columbia River sys- 

 tem. 



EFFECTS OF TEMPERATURE AND SALINITY 



ON EGG HATCHING AND LARVAL SURVIVAL 



OF RED DRUM, SCIAENOPS OCELLATA ' 



Acknowledgments 



My thanks to Dale A. Brege, G. R. Priegel, and 

 J. Congdon for verifying aging; M. E. Urness for 

 technical assistance; D. A. Faurot for reference 

 assistance; C. W. Sims and R. C. Johnsen for man- 

 uscript review. 



Literature Cited 



BENTLEY, W. W, AND H. L. RAYMOND. 



1968. Collection of juvenile salmonids from turbine intake 

 gatewells of major dams in the Columbia River system. 

 Trans. Am. Fish. Soc. 97:124-126. 

 ESCHMEYER, R H. 



1950. The life history of walleye, Stizostedion vitreum 

 vitreum (Mitchill) in Michigan. Bull. Inst. Fish. Res., 

 Mich. Dep. Conserv. 3, 99 p. 

 FORNEY, J. L. 



1966. Factors affecting first-year growth of walleyes in 

 Oneida Lake, New York. N.Y. Fish Game J. 13:146-167. 



Harbour. D. 



1980. Western walleye invasion. Sports Afield 183(3): 



124-130. 

 HUH, H. T. H. E. CALBERT, AND D. A. STUIBER. 



1976. Effect of temperature and light on growth of yellow 



perch and walleye using formulated food. Trans. Am. 



Fish. Soc. 105:254-258. 



Niemuth, w., w. Churchill, andT. Wirth. 



1972. Walleye, its life history, ecology, and management. 

 Wis. Dep. Nat. Resour. I^ibl. 227, 20 p. 



The red drum, Sciaenops ocellata , is a sciaenid fish 

 distributed along the eastern coast of North Amer- 

 ica from Massachusetts to southern Florida and 

 along the gulf coast at least as far south as 

 Tampico, Mexico (Hildebrand and Schroeder 1928; 

 Simmons and Breuer 1962). Spawning occurs in 

 late summer through fall outside estuaries in 

 nearshore coastal waters, and the young red drum 

 is carried into the estuaries by tides and currents 

 (Pearson 1929; Mansueti 1960). Late larvae and 

 early juveniles have been collected in the shallow 

 water of tidal flats and sea grass beds. The early 

 planktonic stages, the eggs and yolk-sac larvae, 

 have not been identified from field collections but 

 have recently been described, based on specimens 

 from laboratory-spawned red drum (Holt et al. 

 1981). 



Temporal fluctuations in abundance of red 

 drum result in annual variation in sport and 

 commercial catches (Matlock and Weaver 1979). 

 Variations in environmental factors such as 

 temperature and salinity could affect egg incuba- 

 tion and larval survival, and ultimately year-class 

 strength. Juveniles and adults are euryhaline and 

 are found naturally in freshwater, in brackish 



'University of Texas Marine Science Institute Contribution 

 No. 466. 



FISHERY BULLETIN: VOL. 79. NO. 3. 198L 



569 



