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Chapter One 1 Chalk rivers of England
Extent of chalk strata in Southern England
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adult algae anglers aquatic plants areas Baetidae Baetis bank side Blue-winged Olive brown trout caddis Caenis chalk streams Common Crayfish cut weed downstream Eaton eels eggs electric fishing Environment Agency Ephemeroptera feed female fishery management floating flow flowers freshwater game fish gravel grayling grow habitat hatch Hindwings important insects invertebrates Large Dark Olive large numbers larvae leaves macrophytes males Mayfly mink Natural England number of fish nymphs Pale parr particularly Photo pike Pondweed predators rainbow trout Ranunculus Reed river bank river keepers river margin River Test salmon scientific scythe season sedge flies Serratella shrimps Signal Crayfish silt southern chalk streams spawning species spinner Spurwing stocked fish Stoneflies stones summer survival temperature Test and Itchen traps trees upstream upwinged flies usually vegetation water meadow system water meadows Water-crowfoot Weed cutting boats weed growth willow wings winter Yellow