Comparison of swimming capacity and energetics of migratory European eel (Anguilla anguilla) and New Zealand short-finned eel (A. australis)

The spawning migration of the European eel (Anguilla anguilla) can cover more than 6000 km, while that of the New Zealand short-finned eel (A. australis) is assumed to be approximately 3000 km. Since these species are expected to show adaptive traits to such an important lifetime event, we hypothesi...

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Bibliographic Details
Published in:Frontiers in Physiology
Main Authors: Christian eTudorache, Erik eBurgerhout, Sebastiaan eBrittijn, Guido evan den Thillart
Format: Article in Journal/Newspaper
Language:English
Published: Frontiers Media S.A. 2015
Subjects:
Biometry
Ecology
Physiology
fish
respirometry
QP1-981
New Zealand
Anguilla anguilla
European eel
Online Access:https://doi.org/10.3389/fphys.2015.00256
https://doaj.org/article/9cdeaf3061fc4ed39298d1a926d6a163
Description
Summary:The spawning migration of the European eel (Anguilla anguilla) can cover more than 6000 km, while that of the New Zealand short-finned eel (A. australis) is assumed to be approximately 3000 km. Since these species are expected to show adaptive traits to such an important lifetime event, we hypothesised differences in swimming capacity and energetics as a response to this adaptation. In an experimental swimming respirometer set-up, critical swimming speed (Ucrit), optimal swimming speed (Uopt), mass specific oxygen consumption rate (ṀO2), standard metabolic rate (SMR), active metabolic rate at Ucrit (AMRcrit) and at Uopt (AMRopt), the minimum cost of transport at Uopt (COTmin), and the scope for activity, were assessed and compared between the species. With a similar body length and mass, European eels showed ca 25% higher values for both Ucrit and Uopt, and 23% lower values for COTmin, compared to New Zealand short-finned eels. However, SMR, AMRcrit, AMRopt and scope for activity did not differ between the species, indicating very similar swimming physiology traits. This study discusses physiological aspects of long distance migration and provides recommendations for a) swimming respirometry in anguilliform fish, and b) telemetry research using externally attached pop-up tags.

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