| Food I | Food II | Food III | Food name | Country | Predator Stage |
|---|---|---|---|---|---|
| detritus | detritus | debris | unidentified | UK Engld Wal | juv./adults |
| nekton | finfish | bony fish | Phoxinus phoxinus | (not available) | adults |
| nekton | finfish | bony fish | Perca fluviatilis | Finland | adults |
| others | other terrest. invertebrates | n.a./terrest. Insects | terrestrial spiders | UK Scotland | juv./adults |
| others | other terrest. invertebrates | n.a./terrest. Insects | terrestial insects | UK Engld Wal | juv./adults |
| plants | other plants | benthic algae/weeds | macrophytes | UK Engld Wal | juv./adults |
| plants | other plants | benthic algae/weeds | unidentified macrophytes | UK Engld Wal | juv./adults |
| zoobenthos | benth. crust. | n.a./other benth. crustaceans | Eurycercus lamellatus | Norway | juv./adults |
| zoobenthos | benth. crust. | n.a./other benth. crustaceans | Lepidurus arcticus | Norway | juv./adults |
| zoobenthos | benth. crust. | ostracods | unidentified | UK Scotland | adults |
| zoobenthos | benth. crust. | shrimps/prawns | freshwater shrimps | UK Engld Wal | juv./adults |
| zoobenthos | insects | insects | Chironomid pupae | Norway | juv./adults |
| zoobenthos | insects | insects | midge | UK Engld Wal | juv./adults |
| zoobenthos | insects | insects | beetle | UK Scotland | juv./adults |
| zoobenthos | insects | insects | mayfly | UK | juv./adults |
| zoobenthos | insects | insects | aquatic bugs | UK Scotland | juv./adults |
| zoobenthos | insects | insects | stonefly | UK Scotland | juv./adults |
| zoobenthos | insects | insects | blackfly | UK Engld Wal | juv./adults |
| zoobenthos | insects | insects | Caddis fly | UK Scotland | juv./adults |
| zoobenthos | insects | insects | flies | UK Scotland | juv./adults |
| zoobenthos | mollusks | bivalves | pea shells | UK Engld Wal | juv./adults |
| zoobenthos | mollusks | gastropods | snails | UK Scotland | juv./adults |
| zoobenthos | other benth. invertebrates | n.a./other benth. Invertebrates | unidentified | UK Scotland | juv./adults |
| zoobenthos | worms | n.a./other annelids | leeches | UK Engld Wal | juv./adults |
| zoobenthos | worms | non-annelids | unidentified | UK Engld Wal | juv./adults |
| zooplankton | fish (early stages) | fish eggs/larvae | unidentified | UK Engld Wal | juv./adults |
| zooplankton | plank. crust. | cladocerans | Bythotrephes longimanus | Norway | juv./adults |
| zooplankton | plank. crust. | cladocerans | water louse | UK Engld Wal | juv./adults |