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acid activity addition aeration aerobic algal growth anaerobic animals aquatic Asterionella autumn benthic benthos biological blue-green algae bottom mud calcium carbon dioxide cells cent Chapter chemical Chironomus Chironomus anthracinus chitin coarse fish Crustacea decaying deposited depth develop diatoms dissolved oxygen effluent eggs environment epilimnion Esthwaite Water example fauna favourable feeding female Figure fresh water freshwater fungi fungus Gammarus grow hatchery heterocysts heterotrophic heterotrophic bacteria hypolimnion important increase insect invertebrate Lake Esrom larvae latter Length at age Loch material micro-organisms migrating nature nitrate nitrogen fixation nutrients nymphs occur organic matter oxidation oxygen particularly pattern phosphate phosphorus photic zone photosynthetic phytoplankton pigments pike planktonic algae pollution ponds population present production profundal benthos release reservoirs Salangen salmon Saprolegnia season sediment sewage showing situation sludge smolts sockeye spawning species sporangium spores sulphur summer temperature tion treatment trout virus water body water samples Windermere winter zooplankton zoospores