Four years of turtle collections on Navigation Pool 13


Gritters, S. A., and L. M. Mauldin  1994.  Four years of turtle
collections on Navigation Pool 13 of the Upper Mississippi River. 
Report by the Iowa Department of Natural Resources, Bellevue,
Iowa, for the National Biological Survey, Environmental
Management Technical Center, Onalaska, Wisconsin, September 1994. 
LTRMP 94-S010.  7 pp.  (NTIS #PB95-136537) 


ABSTRACT

Incidental catches of turtles have been recorded since the
inception of the Long Term Resource Monitoring Program fisheries
component in 1989.  Large numbers of turtles have been collected
by fyke nets used for fisheries assessments in Navigation Pool
13, Upper Mississippi River.  As of November 1992, 560 turtles of
nine species and subspecies have been sampled, with the Western
painted turtle (Chrysemys picta belli) being the most common. 
Tailwater sampling, initiated in 1990, has produced the largest
concentration of turtles, predominantly map (Graptemys spp.)
turtles.  Starting in 1992, captured turtles were sexed and
measured to determine species vital statistics.


KEYWORDS

turtles, Mississippi River, Pool 13, fyke net, painted turtle,
map turtle