Table 3. The phenology and arrival success of eels leaving European catchments.
The proportion of eels arriving by peak spawning and 90% spawning was calculated using observed swimming speeds. The required average travel speed for 50% of eels to arrive by peak spawning was modeled by incrementing the observed speeds at intervals (1 km day−1) and recalculating. The percentage of eels arriving in time for the second spawning opportunity was calculated from observed migration speeds and represents the percentage arriving after the first spawning period has ended, and by 90% of the next. NA, not applicable.
|
Departure (day of year) |
Time to peak spawning (day) |
Peak spawning |
90% spawning |
Required speed (km day−1) |
Second spawning |
|
| All catchments | 288 | 130 | 5 | 12 | 45.9 | 65 |
| Imsa, Norway | 281 | 137 | 4 | 12 | 46.3 | 66 |
| Dee, Scotland | 246 | 172 | 12 | 23 | 43.1 | 61 |
| Lower Bann, Ireland | 276 | 142 | 10 | 21 | 33.8 | 65 |
| Windermere, U.K. | 293 | 125 | 8 | 16 | 36.3 | 65 |
| Schwentine River | 283 | 135 | 3 | 7 | 44.1 | 60 |
| Burrishoole, Ireland | 336 | 82 | 9 | 21 | NA | 66 |
| Shannon, Ireland | 307 | 111 | 2 | 9 | 36.3 | 74 |
| Oir, France | 355 | 63 | 3 | 12 | NA | 71 |
| Fremur, France | 309 | 109 | 1 | 5 | 44.1 | 71 |
| Loire, France | 317 | 101 | 3 | 12 | NA | 71 |
| Fume morte, Spain | 312 | 106 | 3 | 6 | 45.1 | 60 |
| Nive, France | 293 | 125 | 2 | 12 | NA | 71 |
| Gudena, Denmark | 268 | 150 | 3 | 7 | 45.1 | 68 |
| Ulla, Spain | 247 | 171 | 10 | 21 | NA | 67 |
| Halselva, Norway | 223 | 195 | 4 | 12 | 38.6 | 62 |
| ICES 41G2, Sweden | 296 | 122 | 2 | 7 | 41.3 | 64 |
| ICES 40G4, Sweden | 258 | 160 | 3 | 9 | NA | 62 |
| ICES 42G6, Sweden | 293 | 125 | 5 | 12 | 45.1 | 60 |
| ICES 45G6, Sweden | 333 | 85 | 7 | 15 | 41.3 | 58 |
| Warnow, German | 209 | 209 | 5 | 11 | 37.8 | 59 |