The importance of oxbow lakes for fish recruitment in a river system
Penczak, T. Zięba
Archiv für Hydrobiologie Volume 158 Number 2 (2003), p. 267 - 281
published: Oct 24, 2003
ArtNo. ESP141015872008, Price: 29.00 €
Recruitment, movement and body lengths of 0+ fish were investigated in three oxbow lakes (OL) and two neighbouring sections of the Pilica River (1996 2000), and also in four OLs and two neighbouring sections of the Warta River (1998 2000). More juveniles were sampled in OLs than in their parent rivers, especially much more in the Warta River system, where there are wider and deeper connections between the river and OLs. At the end of autumn the majority of species migrate from the channels to OLs, some occupying stagnant and running water in similar proportions, but a riverine species (dace) does the reverse, entering the channel before winter. In 11 cases out of 13, near the end of the growing season (October in Poland) 0+ fish representing different species attained significantly longer body lengths by the same date in the channel than in OLs. This may indicate that recruitment in OLs contributes essentially to the productivity of the channel fisheries, hence separating OLs from their channels by levees requires consideration, because such engineering may diminish fishery yields in a river system.