Dear Ian I dont know much about trout,but my guess is, that the species'reproduction and the hydrology of your rivers is not properly synchronized (e.g. there are very low flow rates shortly after spawning or very high discharges after the fry leaves the gravel). best wishes Irene ************************************* Irene Zweimueller e-mail: [log in to unmask] Inst. of Zoology phone: ++43 1 31 336 1337 or 1342 Dept. of Limnology fax: ++43 1 31 336 778 Althanstr. 14 A-1090 Wien AUSTRIA - EUROPE ************************************
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