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Article Dans Une Revue Canadian Journal of Fisheries and Aquatic Sciences Année : 2023

Habitat use and growth of yellow-stage European eel in coastal and freshwater ecosystems in Norway

Mehis Rohtla
Michael Arts
Howard Browman
Camilla Parzanini
Anne Berit Skiftesvik
Eva Thorstad
Terje van der Meeren

Résumé

Many anguillid eel species display facultative catadromy. Some eel spend their entire life cycle in marine coastal areas, but the geographical extent of this, especially at the extremes of their distributional ranges, is unknown. We analysed otolith Sr:Ca and Ba:Ca from yellow-stage European eel ( Anguilla anguilla) sampled along the coast of Norway and in several freshwater lakes (58°N–63°N), to infer their initial settlement and later life movement patterns with regards to habitat salinity. Most eel (80%) sampled in marine habitats ( n = 371) had settled and remained in marine water, but 20% had moved between marine and freshwater habitats and were hence classified as inter-habitat shifters. Among freshwater sampled eel ( n = 99), 80% had settled and remained in fresh water, but 20% were classified as inter-habitat shifters. The average growth rates for marine water residents, inter-habitat shifters, and freshwater residents were 35, 27, and 17 mm·year –1 , respectively. Northern European shallow marine habitats may serve as important yellow eel growth habitats and may be critical to buffer the European eel population against the general decrease in continental recruitment.

Dates et versions

hal-04228437 , version 1 (04-10-2023)

Identifiants

Citer

Mehis Rohtla, Françoise Daverat, Michael Arts, Howard Browman, Camilla Parzanini, et al.. Habitat use and growth of yellow-stage European eel in coastal and freshwater ecosystems in Norway. Canadian Journal of Fisheries and Aquatic Sciences, 2023, 80 (1), pp.14-26. ⟨10.1139/cjfas-2022-0033⟩. ⟨hal-04228437⟩
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