Table 3. Comparison of the prey of subadult grey seal males collected from four ICES subdivisions of the Baltic sea (27, 29, 30 and 32) indicated by gut morphological i.e. hard part (HP, mass %) and DNA (sequence %) prey proportions.
| Prey of subadult males in ICES subdivisions |
27 | 29 | 30 west* | 32 |
|---|---|---|---|---|
| HP / DNA n = 12 / n = 11 |
HP / DNA n = 4 / n = 5 |
HP / DNA n = 5 / n = 6 |
HP / DNA n = 15 / n = 19 |
|
| Baltic herring Clupea harengus | 55.3 / 43.8 | 50.0 / 35.2 | 73.9 / 65.2 | 26.2 / 32.8 |
| Eelpout Zoarces viviparus | 10.5 / 12.3 | 24.9 / 6.3 | 12.7/ <0.1 | 6.1 / 4.4 |
| Perch Perca fluviatilis | 13.6 / 8.8 | ND / ND | 2.6 / 1.5 | 21.7 / 18.8 |
| Sprat Sprattus sprattus | 4.4 / 11.5 | ND / 24.8 | 1.2 / ND | 2.6 / 2.1 |
| Three-spined stickleback G. aculeatus | ND / ND | 0.1 / 33.7 | ND / ND | ND / 2.9 |
| Isopod crustacean Saduria entomon | ND / ND | 25.1 / ND | ND / ND | 0.4 / ND |
| Cod Gadus morhua | 0.5 / 3.6 | ND / ND | ND / 16.7 | ND / ND |
| Pikeperch Sander lucioperca | ND / <0.1 | ND / ND | ND / ND | 10.6 / 5.3 |
| European eel Anguilla anguilla | 9.3 / 6.4 | ND / ND | ND / <0.1 | ND / ND |
| Bream Abramis brama | ND / 3.6 | ND / 0.1 | ND / ND | ND / 11.3 |
| Roach Rutilus rutilus | ND / ND | ND / ND | ND / ND | 7.3 / 7.5 |
| Burbot Lota lota | ND / ND | ND / ND | ND / ND | ND / 7.6 |
| Ruffe Gymnocephalus cernua | ND / ND | ND / ND | ND / ND | 2.4 / 0.7 |
| Sea trout Salmo trutta | 2.8 / ND | ND / ND | ND / ND | ND / ND |
| Four-horned sculpin M. quadricornis | ND / ND | ND / ND | 2.8 / ND | ND / ND |
| Atlantic salmon Salmo salar | ND / 2.4 | ND / ND | ND / ND | ND / <0.1 |
| Sand goby Pomatoschistus minutus | ND / ND | ND / ND | ND / ND | ND / 1.5 |
| Smelt Osmerus eperlanus | ND / ND | ND / ND | ND / ND | 1.3 / < 0.1 |
| Common whitefish C. lavaretus | ND / ND | ND / ND | ND / ND | 0.8 / ND |
| Rainbow trout Oncorhynchus mykiss | ND / <0.1 | ND / ND | ND / ND | ND / ND |
| Black goby Gobius niger | ND / <0.1 | ND / ND | ND / ND | ND / ND |
| White bream Blicca bjoerkna | ND / ND | ND / ND | ND / ND | ND / <0.1 |
| Sculpins Cottidae | ND / ND | ND / ND | ND / 16.6 | 0.1 / < 0.1 |
| Cyprinids Cyprinidae | 2.1 / ND | ND / ND | ND / ND | 10.8 / ND |
| Sand lances Ammodytidae | 0.6 / 2.7 | ND / ND | 6.7 / ND | ND / ND |
| Percids Percidae | ND / ND | ND / ND | ND / ND | 5.5 / ND |
| Whitefishes Coregonus spp | ND / 0.2 | ND / ND | ND / ND | ND / 4.8 |
| Daces Leuciscus sp. | ND / 4.5 | ND / ND | ND / ND | ND / ND |
| Lampreys Petromyzontidae | ND / ND | ND / ND | ND / ND | 4.1 / ND |
| Clupeids Clupeidae | 0.9 / ND | ND / ND | ND / ND | ND / ND |
| Gobies Gobiidae | ND / ND | ND / ND | <0.1 / ND | 0.2 / ND |
| European flounder or plaice Plat. flesus or Pleur. platessa |
ND / 0.2 | ND / ND | ND / ND | ND / ND |
*Only two subadult males were collected from the eastern coast of SD30, the gut of one solely contained undefined herring/sprat by HP, and the prey of the other included 96.6% sprat and 3.4 mol% eelpout by DNA.