| Food I | Food II | Food III | Food name | Country | Predator Stage |
|---|---|---|---|---|---|
| detritus | detritus | debris | unidentified | (not available) | juv./adults |
| nekton | finfish | bony fish | unidentified | (not available) | juv./adults |
| others | other terrest. invertebrates | n.a./terrest. insects | unidentified arachnids | Spain | juv./adults |
| others | other terrest. invertebrates | n.a./terrest. insects | unidentified flies | Spain | juv./adults |
| others | other terrest. invertebrates | n.a./terrest. insects | caddis flies | Spain | juv./adults |
| plants | other plants | benthic algae/weeds | unidentified | UK | juv./adults |
| zoobenthos | benth. crust. | amphipods | unidentified gammarids | Spain | adults |
| zoobenthos | benth. crust. | amphipods | unidentified gammarids | Spain | recruits/juv. |
| zoobenthos | benth. crust. | n.a./other benth. crustaceans | unidentified arthropods | Spain | recruits/juv. |
| zoobenthos | benth. crust. | n.a./other benth. crustaceans | crayfish | UK Engld Wal | juv./adults |
| zoobenthos | benth. crust. | shrimps/prawns | freshwater shrimps | UK Engld Wal | juv./adults |
| zoobenthos | insects | insects | caenids mayflies larvae | Spain | adults |
| zoobenthos | insects | insects | midge | UK Engld Wal | juv./adults |
| zoobenthos | insects | insects | beetle | UK Engld Wal | juv./adults |
| zoobenthos | insects | insects | blackfly | UK Engld Wal | juv./adults |
| zoobenthos | insects | insects | elmids beetles | Spain | recruits/juv. |
| zoobenthos | insects | insects | mayflies larvae | Spain | recruits/juv. |
| zoobenthos | insects | insects | mayfly | UK Engld Wal | juv./adults |
| zoobenthos | insects | insects | heptageniids mayflies larvae | Spain | recruits/juv. |
| zoobenthos | insects | insects | water mite | Spain | adults |
| zoobenthos | insects | insects | water mite | Spain | recruits/juv. |
| zoobenthos | insects | insects | caddis flies larvae | Spain | recruits/juv. |
| zoobenthos | insects | insects | limoniids flies | Spain | recruits/juv. |
| zoobenthos | insects | insects | aquatic bugs | UK Engld Wal | juv./adults |
| zoobenthos | insects | insects | simuliids flies | Spain | recruits/juv. |
| zoobenthos | insects | insects | Caddis fly | UK Engld Wal | juv./adults |
| zoobenthos | insects | insects | unidentified trichopteran larvae | Ireland | juv./adults |
| zoobenthos | mollusks | gastropods | unidentified ancylids | Spain | adults |
| zoobenthos | mollusks | gastropods | unidentified ancylids | Spain | recruits/juv. |
| zoobenthos | other benth. invertebrates | n.a./other benth. Invertebrates | unidentified | UK Scotland | juv./adults |
| zoobenthos | worms | non-annelids | unidentified nematods | Spain | recruits/juv. |
| zoobenthos | worms | non-annelids | unidentified | UK Scotland | juv./adults |
| zooplankton | fish (early stages) | fish eggs/larvae | Coregonus albula | Finland | juv./adults |
| zooplankton | fish (early stages) | fish eggs/larvae | unidentified | (not available) | juv./adults |
| zooplankton | plank. crust. | plank. copepods | unidentified | UK Engld Wal | juv./adults |