As part of a research project on American eel productivity for a watershed, we have to estimate the number of eel that migrate to the sea. This year, we observed an odd phenomenon during eel migration: from August until now there was almost no rain (10% of normal rainfall). Water rises were not recorded and temperature dropped rapidly. Silver eel migration to the sea was stopped early in the season and water temp. is now around 4°C in the river. My question is: What will happen for a catadromous fish, physiologically ready for seaward migration that do not meet environmental condition (water rises) before becoming torpid (below 10°C)? If somebody has any answer, comments or experience that could help me, I would appreciate it. You could reply directly to me and I will do a summary for the entire list.-- Guy Verreault < mef.rdl@transcom.qc.ca> via <FISH ECOLOGY@SEGATE.SUNET.SE>

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