Pop up satellite tags impair swimming performance and energetics of the European eel (Anguilla anguilla)

Pop-up satellite archival tags (PSATs) have recently been applied in attempts to follow the oceanic spawning migration of the European eel. PSATs are quite large, and in all likelihood their hydraulic drag constitutes an additional cost during swimming, which remains to be quantified, as does the po...

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Bibliographic Details
Published in:PloS one 2011-06, Vol.6 (6), p.e20797-e20797
Main Authors: Methling, Caroline, Tudorache, Christian, Skov, Peter V, Steffensen, John F
Format: Article
Language:English
Subjects:
Anguilla - metabolism
Anguilla - physiology
Anguilla anguilla
Animal behavior
Animal Migration
Animals
Biology
Biomechanical Phenomena
Commercial fishing
Cyprinus carpio
Drag
Earth Sciences
Eels
Energy expenditure
Energy Metabolism
Exercise physiology
Female
Females
Fish
Fisheries
Fishes
Fishing
Fluid mechanics
Kinematics
Marine ecology
Metabolic rate
Metabolism
Micropterus dolomieu
Minimum cost
Oncorhynchus kisutch
Oxygen
Oxygen - metabolism
Oxygen consumption
Pygoscelis
Rhinoptera
Rhinoptera bonasus
Salmon
Salvelinus fontinalis
Spawning
Spawning migrations
Strouhal number
Studies
Swimming
Tags
Telemetry - adverse effects
Telemetry - instrumentation
Transmitters
Velocity
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Summary:Pop-up satellite archival tags (PSATs) have recently been applied in attempts to follow the oceanic spawning migration of the European eel. PSATs are quite large, and in all likelihood their hydraulic drag constitutes an additional cost during swimming, which remains to be quantified, as does the potential implication for successful migration. Silver eels (L(T) = 598.6±29 mm SD, N = 9) were subjected to swimming trials in a Steffensen-type swim tunnel at increasing speeds of 0.3-0.9 body lengths s(-1), first without and subsequently with, a scaled down PSAT dummy attached. The tag significantly increased oxygen consumption (MO(2)) during swimming and elevated minimum cost of transport (COT(min)) by 26%. Standard (SMR) and active metabolic rate (AMR) as well as metabolic scope remained unaffected, suggesting that the observed effects were caused by increased drag. Optimal swimming speed (U(opt)) was unchanged, whereas critical swimming speed (U(crit)) decreased significantly. Swimming with a PSAT altered swimming kinematics as verified by significant changes to tail beat frequency (f), body wave speed (v) and Strouhal number (St). The results demonstrate that energy expenditure, swimming performance and efficiency all are significantly affected in migrating eels with external tags.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0020797