Abstract
Durable marking of fish is an important prerequisite in many fish-ecological studies. In the course of a mark-recapture experiment with small European eels stocked in lakes, marking success rates above 95% were observed for coded wire tags and for alizarin red S marks 1–14 years after stocking. Both marking methods are therefore considered suitable for lifelong marking and tagging of eels, and application in long-term mark-recapture experiments.
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