Aquatic Sciences Meeting, Albuquerque 2001

SS46 Anadromous Fish as Links Between Marine and Freshwater Ecosystems (Spatial and Temporal Connections)

Date: Friday, February 16, 2001, Time: 10:15:00 AM

Location: Sandia/Santa Ana

Bartl, E, J, Univ. Vienna,Inst. Of Ecology And Conversation Biology, Vienna, Austria, a9501322@unet.univie.ac.at

Keckeis, H, , Univ. Vienna,Inst. Of Ecology And Conversation Biology, Vienna, Austria, hubert.keckeis@univie.ac.at

GROWTH PERFORMANCE OF RHEOPHILIC FISH LARVAE IN DEPENDENCE OF THE RETENTION CAPACITY IN A RESTRUCTURED FLOOD PLAIN AREA

The potential of a newly restructured river as a nursery for endangered rheophilic fish species was estimated by introducing a population of individually marked nase larvae into two different river sections. Fish otoliths were marked with Alizarin Red in order to analyse the growth rate based on back calculated daily increments. The river sections (one flood plain area, one straight river channel) were clearly different regarding river morphology, hydrological conditions and degree of connectivity. After a period of 4 months (with weekly sampling intervals) clear differences in fish abundance and fish size were observed. These differences are discussed with regard to habitat availability and structural properties as well as temperature and water current conditions.

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Aquatic Sciences Meeting, Albuquerque 2001

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