Movement and habitat use of juvenile Atlantic sturgeon in the Wisloka River (southern Poland)

The habitats and the movements of juvenile Atlantic sturgeon, Acipenser oxyrinchus oxyrinchus Mitchill, in the Wisloka River (Poland) were described. Radio telemetry methods were used to identify migration rates and the sites where sturgeon stopped during the day. In the 2009-2010 period, 25 juvenile sturgeon equipped with radio telemetry transmitters were released into the Wisloka; most of them left the river from two to seven days later. In 2009, the sturgeon covered from 0 to 45.3 km, while one year later in 2010 they covered from 0.1 to 54.1 km; the mean migration rates in these two years did not differ significantly statistically. The sturgeon migrated at a mean rate of 0.84 BL (standard body length) in one second in 2009 and at 0.94 BL in one second in 2010. No statistically significant dependence was noted between migration rate and the size of the sturgeon