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Ecology
England
8
Water quality
Limnology
7
River fisheries
7
Salmo salar
7
Fisheries
6
Rivers
6
Salmo trutta
6
Salmon fisheries
6
Fishery surveys
5
Stocking density
5
Distribution
4
Fry
4
Lune Catchment
4
Electric fishing
3
Droughts
2
Ouse Catchment
2
Algae
1
Biological production
1
Biological stress
1
Coastal zone
1
Distribution records
1
Environment
1
Habitat improvement
1
Marine molluscs
1
Migratory species
1
Oceanography
1
Oil spills
1
Pesticides
1
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