Donald C. Hales's research while affiliated with South Dakota State University and other places

Publications (4)

Article
Full-text available
Life history of paddlefish Polyodon spathula was investigated in the unimpounded, unchannelized stretch of Missouri River below Gavins Point Dam, South Dakota-Nebraska during 1972–1979. Females were longer and heavier than males of similar age. The von Bertalanffy growth equation for males and females was Lt= 84.9{1 - exp[-0.133(t + 5.159)]} and Lt...
Article
Full-text available
The food of adult paddlefish, Polyodon spathula, from a section of the Missouri River (South Dakota-Nebraska) in 1975-76 was almost entirely crustacean zooplankton. Paddlefish were indiscriminate filter feeders and apparently ingested all material strained from the water column; organisms less than about 0.20-0.25 mm long (0.10-0.12 mm wide) were n...
Article
Full-text available
Of 458 paddlefish (Polyodon spathula) collected from the Missouri River (South Dakota-Nebraska) from June 1975 to August 1976, 165 (36%) bore scars and 46 (10%) had severed rostrums. Small fish and young fish were as likely to be scarred as large fish and old fish. Scarred fish had lower condition factors than unscarred fish. Scars originated prima...

Citations

... The functionality of the paddle is obviously affected by these injuries (see Chapter 2). Rosen and Hales (1982) reported a blind paddlefish. Pegg et al. (2009) examined the adverse nutritional effects on paddlefish caused by invasive bighead carp (Hypophthalmichthys nobilis) and silver carp (H. ...
... The mouth is large, located in a ventral position, and the digestive tube has a formation specific to the Acipenseriform family, namely the spiral valve [11][12][13]. Paddlefish consume planktonic organisms-especially zooplankton, aquatic insects and larvae [14][15][16][17]. They reach sexual maturity at the age of 7-8 years in males and 10-13 years in females [18,19]. ...
... The effects of dams on paddlefish have been well studied in many systems (Purkett 1961;Pasch et al. 1980;Rosen and Hales 1980;Paukert and Fisher 2001;Zigler et al. 2004;Firehammer and Scarnecchia 2007) but in Alabama, they have been less studied, with passage over low-head dams only recently documented (Mettee et al. 2005(Mettee et al. , 2006Simcox et al. 2015). ...
... Despite historically high mortality rates (18%; Rosen et al., 1982), the paddlefish population below Gavins Point Dam in the Missouri River of South Dakota fosters both recreational snagging and bowfishing fisheries, and a population with an increasing size structure (i.e., increased mean length; Mestl et al., 2019). Natural paddlefish recruitment and variable entrainment of stocked age-0 paddlefish through Gavins Point Dam ) support the population below Gavins Point Dam (Bettoli et al., 2009;Mestl et al., 2005;Pierce et al., 2011). ...