Table 1 Migration metrics for eels that escaped the coast and entered the Atlantic Ocean.

Values are average ±1 SD of the mean. Figures in brackets show the maximum values observed. Two different measures of distance and migration speed were calculated, one representing the entire migration and one that took into account only the distance and speed during the oceanic portion of the migration (eel occupies water depth >200 m). A table providing details for all eel migrations is provided in table S3b.

Location
(n)
Duration
(days)
Full distance
(km)
Speed
(km day−1)
Oceanic distance (km)Oceanic speed (km day−1)
Celtic Sea (8)106.8 ± 77.0 (273)2716.8 ± 1985.1 (6982.5)26.3 ± 7.2 (42.5)2277.3 ± 2066 (6709)24.4 ± 7.0 (33.8)
Mediterranean (3)157.1 ± 43.2 (183)1774.3 ± 434.7 (2245)11.5 ± 1.9 (12.9)1360.6 ± 498 (1905)14.5 ± 7.2 (21.8)
North Sea (5)27.8 ± 9.3 (34)533.6 ± 269.8 (794)21.4 ± 5.9 (29.1)
Baltic Sea (22)103.5 ± 42.8 (157)1768.2 ± 623.6 (2887)18.1 ± 5.5 (29.0)1574.6 ± 602.2 (2638)22.7 ± 8.3 (35.4)
Summary (38)98.5 ± 57.1 (273)1805.9 ± 1176.2 (6982.5)19.8 ± 6.9 (42.5)1725.5 ± 1136.4 (6709)22.4 ± 8.1 (35.4)