Effects on the aquatic biota of lime (CaCO 3 ) application in acidified lakes and streams were studied in a number of waters . After treatment, lime-sensitive species of mosses (Sphagnum spp .) decreased, but species such as Potamogeton natans and Myriophyllum alterniflorum seemed to be favoured . A few years after liming species composition and diversity of phytoplankton, zooplankton and benthic insect larvae were almost identical to that found in oligotrophic and non-acid lakes . Molluscs and benthic crustaceans may have difficulties recolonizing . Reproduction of remaining species of fish was successful as soon as pH increased . High survival of larvae and fry can result in some extremely rich year classes with slow individual growth . In most cases restocking of depleted fish stocks was successful .

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