| J | F | M | A | M | J | J | A | S | O | N | D | Land | Observationsplats |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 111 | 111 | 111 | Poland | Gulf of Gdansk (spring herring) | |||||||||
| 111 | 111 | 111 | Poland | Gulf of Gdansk - Spring spawning stock | |||||||||
| 111 | 111 | 111 | Sweden | Hållsfjärden, 1978-1982 | |||||||||
| 111 | 111 | 90 | 100 | 111 | 111 | 111 | Western and southwestern Baltic |