Gert:
You might try getting a copy of FAO/ICLARM FiSAT (Fisheries Stock Assessment Tools). This includes procedures for the Battacharya method and Hasselblad's Normsep for splitting lenghth frequency data into modal groups.
The interface is a bit clunky, but it works.
-- Richard G. Dudley
[log in to unmask] http://home.indo.net.id/~rdudley
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