Anders Eklöv

Effect of an Artificial Pond on Migrating Brown Trout Smolts

Abstract In southern Sweden, nutrient runoff from agricultural areas causes extensive eutrophication of inland and coastal waters. To reduce nutrient transport, especially nitrogen, resource managers are creating wetlands and ponds within stream systems. During 1996 and 1997, we studied the migration of smolts of brown trout Salmo trutta through one of these artificial ponds, situated in Onnerupsbacken Creek in southern Sweden. Because the former migration route through the stream was severed, migration through the pond was compared with an upstream reference section in the stream. Smolts were captured by a smolt trap about 2 km upstream of the pond and marked with electronic passive integrated transponders before being released into the stream. Downstream of the smolt trap, loss rate, swimming speed, and timing of movements of the brown trout were measured in the reference stream section and in the pond as the smolts passed each of three submerged antennae placed in the stream and at the ponds inlet and...

DDT - FATE IN TROPICAL AND TEMPERATE REGIONS

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