Table 2.
Species registered in the different fish surveys. Values are % of abundance based on mean annual catch per unit effort over years 2012–2020 for gill net and juvenile fish surveys, and 2012–2017 for trap nets. F = freshwater origin, M = marine origin. * Belonging to family Cyprinidae. BJO = Björnöfjärden, REF = Reference. Trap net data were only collected from Björnöfjärden
| Species | Gill nets | Juvenile fish survey | Trap nets | |||
|---|---|---|---|---|---|---|
| Scientific name | English name | BJO | REF | BJO | REF | BJO |
| Abramis brama/Blicca bjoerknaa | Bream/white bream (F)* | 18.2 | 4.8 | 1.9 | 2.1 | |
| Abramis brama | Bream (F)* | – | – | – | – | 3.2 |
| Alburnus alburnus | Bleak (F)* | 13.4 | 5.4 | 5.9 | 2.4 | 0 |
| Anguilla anguilla | Eel (M) | 0 | 0 | 0 | 0 | 0.3 |
| Blicca bjoerkna | White bream (F)* | – | – | – | – | 3.5 |
| Carassius carassius | Crucian carp (F)* | 0.2 | 0 | 0.1 | 0.1 | 0.1 |
| Clupea harengus | Herring (M) | 3.5 | 0.8 | 0 | 0 | 2.3 |
| Coregonus maraena | Whitefish (F) | 0 | 0 | 0 | 0 | 0 |
| Esox lucius | Pike (F) | 0.2 | 0.2 | 1.2 | 2.7 | 0.3 |
| Gasterosteus aculeatus | Three-spined stickleback (M) | 0 | 0 | 0.2 | 0 | 0 |
| Gobius niger | Black goby (M) | 0 | 0 | 0.3 | 0.2 | 0 |
| Gymnocephalus cernua | Ruffe (F) | 1.6 | 2.7 | 0.2 | 0.9 | 2.8 |
| Leuciscus idus | Ide (F) | 0 | 0 | 0.1 | 0 | 0 |
| Leuciscus cephalus | European chub (F)* | 0 | 0 | 0 | 0 | 0 |
| Lota lota | Burbot (F) | 0 | 0 | 0 | 0 | 0 |
| Myoxocephalus quadricornis | Fourhorn sculpin (F) | 0 | 0 | 0 | 0 | 0 |
| Onchorhynchus mykiss | Rainbow trout | 0 | 0 | 0 | 0 | 0 |
| Osmerus eperlanus | Smelt (F) | 0.2 | 0 | 0 | 3.6 | 0 |
| Perca fluviatilis | Perch (F) | 36 | 42 | 15 | 24 | 34 |
| Platichthys flesus | Flounder (M) | 0 | 0 | 0 | 0 | 0 |
| Pomatoschistus microps/P. minutus1 | Common goby/sand goby (M) | 0 | 0 | 1.4 | 3.2 | 0 |
| Pungitius pungitius | Nine-spined stickleback (M) | 0 | 0 | 0 | 0 | 0 |
| Rutilus rutilus | Roach (F)* | 26 | 37 | 72 | 59 | 51 |
| Salmo trutta | Trout (N/A) | 0 | 0 | 0 | 0 | 0 |
| Scardinius erythrophthalmus | Rudd (F)* | 0.8 | 0.8 | 0 | 0 | 0.7 |
| Sprattus sprattus | Sprat (M) | 0.2 | 0 | 0 | 0 | 0 |
| Sander lucioperca | Pikeperch (F) | 0 | 0 | 0 | 0 | 0 |
| Tinca tinca | Tench (F)* | 0.8 | 1.3 | 0.2 | 0.1 | 1.3 |
| Vimba vimba | Vimba bream (F)* | 0 | 0 | 0 | 0 | 0 |
aNot distinguished due to high morphological similarity