Table 5.
Experimental swim trials performed at Leiden University in (a) freshwater (FW) and (b) salt water (SW)
| Origin | n | Sex (m/f) | Age (year) | Migr. period (weeks) | Migr. distance (km) | EI | GS | Ref |
|---|---|---|---|---|---|---|---|---|
| (a) FW trials | ||||||||
| Lake Balaton (Hu) | 40 | f | 16* | 1 | <300 | 0 | Stage 3 | Palstra et al. (2007a) |
| River Loire (Fr) | 20 | f | 16 ± 4 | 1 | <300 | * | Palstra et al. (2008a) | |
| Lake Balaton (Hu) | 6 | f | 16 ± 1 | 2 | 350 | * | Stage 3 | Palstra et al. (2007a) |
| Lake Balaton (Hu) | 9 | f | 16 ± 3 | 6 | 1,100 | * | Stage 3 | Palstra et al. (2007a) |
| Farm | 6 | f | 5 | 6 | 2,200 | * | Stage 3 | Palstra et al. (2006a) |
| Farm | 15 | f | 3 | 25 | 5,500 | 0 | Stage 3 | van Ginneken et al. (2007a) |
| (b) SW trials | ||||||||
| Lake Grevelingen (NL) | 20 | f | 11 ± 4 | 0.6 | <300 | 0 | Palstra et al. (2008a) | |
| Lake Grevelingen (NL) | 6 | f | 8 ± 2 | 4 | 1,200 | 0 | Stage 3 | Palstra et al. (2006b) |
| Lake Grevelingen (NL) | 11 | f | – | 4 | 1,000 | 0 | Stage 3 | Palstra et al. (unpublished data) |
| Greece | 6 | f | – | 6 | 900 | 0 | Stage 3 | Palstra et al. (unpublished data) |
| Greece | 6 | f | – | 12 | 1,400 | 0 | Stage 3 | Palstra et al. (2008b) |
| Greece | 6 | m | – | 6 | 500 | 0 | Stage 2 | Palstra et al. (unpublished data) |
| Greece | 6 | m | – | 12 | 900 | 0 | Stage 2 | Palstra et al. (2008b) |
Columns represent the origin of experimental eels, the number (n), their sex male (m) or female (f), their age in years, the experimental simulated migration period in weeks, the migrational distance in km, occurrence of significant changes in eye index EI (+) or not (−), the dominant gonad stage (GS) after swimming and the literature reference. The asterisk marks an estimated age corresponding with findings for other Lake Balaton eels