Distribution, relative abundance and movements of pallid sturgeon in the free-flowing Mississippi River

Autor: Steven G. George, Catherine E. Murphy, K. J. Killgore, Jan Jeffrey Hoover, W. E. Lancaster, B. R. Lewis
Rok vydání: 2007
Předmět:
Zdroj: Journal of Applied Ichthyology. 23:476-483
ISSN: 1439-0426
0175-8659
DOI: 10.1111/j.1439-0426.2007.00891.x
Popis: Summary A multiyear study of pallid sturgeon distribution and relative abundance was conducted in the lower and middle Mississippi river (LMR and MMR, respectively). The LMR and MMR comprise the free-flowing Mississippi River extending 1857 river kilometers (rkm) from its mouth at the Gulf of Mexico upstream to the mouth of the Missouri River. A total of 219 pallid sturgeon and 6018 shovelnose sturgeon was collected during the periods 1996–1997 and 2000–2006. Trotlines baited with worms were the primary collecting gear. The smallest pallid sturgeon captured on trotlines was 405 mm FL and the largest was 995 mm FL. Mean size of pallid sturgeon was statistically smaller in the Mississippi River below the Atchafalaya River near Baton Rouge, LA (621 mm FL). Mean abundance (catch per trotline night) of pallid sturgeon was highest at water temperatures around 10°C. There was a latitudinal trend in mean abundance of pallid and shovelnose sturgeon, but the pattern differed between species. Pallid sturgeon abundance was statistically (P
Databáze: OpenAIRE