Schooling reduces energy consumption in swimming male European eels, Anguilla anguilla L.

E. Burgerhout, C. Tudorache, S.A. Brittijn, A.P. Palstra, R.P. Dirks, G.E.E.J.M. Thillart

Research output: Contribution to journalArticleAcademicpeer-review

22 Citations (Scopus)

Abstract

During migration, swimming in schools provides fish with a number of behavioural and ecological advantages, including increased food supply and reduced predation risk. Previous work shows that carangiform and tunniform swimming result in energetic advantages for individuals using a diamond swimming formation. However, little is known about the potential energetic advantage associated with schooling for anguilliform fish, such as European eel. European eels migrate over a long distance to their spawning area in the Sargasso Sea and may experience energetic advantages when swimming in schools. In this study the effect of group-wise swimming on the cost of transport was tested. In addition, the swimming pattern of eels swimming in groups was studied. Male silver eels were individually subjected to an increased velocity test (0.4–0.9 m s- 1) with increments of 0.1 m s- 1 every 2 h. Groups comprising of seven males were swum following the same protocol. Video recordings were obtained to analyse tail beat frequency at the various water speeds. At all swimming speeds the oxygen consumption was significantly lower in group-wise vs. individually swimming males. The cost of transport at the optimal swimming speed of group-wise swimming males was significantly lower than that of the individually swimming males (21.3 ± 3.2 vs. 32.0 ± 0.6 mg O2 kg- 1 h- 1, respectively). The optimal swimming speeds, however, were not significantly different (0.57 ± 0.02 and 0.52 ± 0.04 m s- 1 respectively). At speeds of 0.50 m s- 1 and above, tail beat frequency was lower in males swimming in groups than in males swimming individually (2.6 ± 0.1 and 3.8 ± 0.1, respectively). In contrast to the ‘diamond’ shape pattern of many group-wise swimming fish, eels tend to swim in a synchronized fashion parallel to each other, possibly reducing swimming costs by Karman gaiting. Although not an evidence, the present study provides support for the assumption of group migration in European eels.
Original languageEnglish
Pages (from-to)66-71
JournalJournal of Experimental Marine Biology and Ecology
Volume448
DOIs
Publication statusPublished - 2013

Fingerprint

Anguilla anguilla
eel
education
energy consumption
energetics
diamond
tail
fish
cost
schools of fish
Sargasso Sea
group effect
predation risk
oxygen consumption
food supply

Keywords

  • tail beat frequency
  • fish schools
  • embiotoca-lateralis
  • oxygen-consumption
  • efficiency
  • speeds
  • energetics
  • migration
  • sargasso
  • benefits

Cite this

Burgerhout, E. ; Tudorache, C. ; Brittijn, S.A. ; Palstra, A.P. ; Dirks, R.P. ; Thillart, G.E.E.J.M. / Schooling reduces energy consumption in swimming male European eels, Anguilla anguilla L. In: Journal of Experimental Marine Biology and Ecology. 2013 ; Vol. 448. pp. 66-71.
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abstract = "During migration, swimming in schools provides fish with a number of behavioural and ecological advantages, including increased food supply and reduced predation risk. Previous work shows that carangiform and tunniform swimming result in energetic advantages for individuals using a diamond swimming formation. However, little is known about the potential energetic advantage associated with schooling for anguilliform fish, such as European eel. European eels migrate over a long distance to their spawning area in the Sargasso Sea and may experience energetic advantages when swimming in schools. In this study the effect of group-wise swimming on the cost of transport was tested. In addition, the swimming pattern of eels swimming in groups was studied. Male silver eels were individually subjected to an increased velocity test (0.4–0.9 m s- 1) with increments of 0.1 m s- 1 every 2 h. Groups comprising of seven males were swum following the same protocol. Video recordings were obtained to analyse tail beat frequency at the various water speeds. At all swimming speeds the oxygen consumption was significantly lower in group-wise vs. individually swimming males. The cost of transport at the optimal swimming speed of group-wise swimming males was significantly lower than that of the individually swimming males (21.3 ± 3.2 vs. 32.0 ± 0.6 mg O2 kg- 1 h- 1, respectively). The optimal swimming speeds, however, were not significantly different (0.57 ± 0.02 and 0.52 ± 0.04 m s- 1 respectively). At speeds of 0.50 m s- 1 and above, tail beat frequency was lower in males swimming in groups than in males swimming individually (2.6 ± 0.1 and 3.8 ± 0.1, respectively). In contrast to the ‘diamond’ shape pattern of many group-wise swimming fish, eels tend to swim in a synchronized fashion parallel to each other, possibly reducing swimming costs by Karman gaiting. Although not an evidence, the present study provides support for the assumption of group migration in European eels.",
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Schooling reduces energy consumption in swimming male European eels, Anguilla anguilla L. / Burgerhout, E.; Tudorache, C.; Brittijn, S.A.; Palstra, A.P.; Dirks, R.P.; Thillart, G.E.E.J.M.

In: Journal of Experimental Marine Biology and Ecology, Vol. 448, 2013, p. 66-71.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Schooling reduces energy consumption in swimming male European eels, Anguilla anguilla L.

AU - Burgerhout, E.

AU - Tudorache, C.

AU - Brittijn, S.A.

AU - Palstra, A.P.

AU - Dirks, R.P.

AU - Thillart, G.E.E.J.M.

PY - 2013

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N2 - During migration, swimming in schools provides fish with a number of behavioural and ecological advantages, including increased food supply and reduced predation risk. Previous work shows that carangiform and tunniform swimming result in energetic advantages for individuals using a diamond swimming formation. However, little is known about the potential energetic advantage associated with schooling for anguilliform fish, such as European eel. European eels migrate over a long distance to their spawning area in the Sargasso Sea and may experience energetic advantages when swimming in schools. In this study the effect of group-wise swimming on the cost of transport was tested. In addition, the swimming pattern of eels swimming in groups was studied. Male silver eels were individually subjected to an increased velocity test (0.4–0.9 m s- 1) with increments of 0.1 m s- 1 every 2 h. Groups comprising of seven males were swum following the same protocol. Video recordings were obtained to analyse tail beat frequency at the various water speeds. At all swimming speeds the oxygen consumption was significantly lower in group-wise vs. individually swimming males. The cost of transport at the optimal swimming speed of group-wise swimming males was significantly lower than that of the individually swimming males (21.3 ± 3.2 vs. 32.0 ± 0.6 mg O2 kg- 1 h- 1, respectively). The optimal swimming speeds, however, were not significantly different (0.57 ± 0.02 and 0.52 ± 0.04 m s- 1 respectively). At speeds of 0.50 m s- 1 and above, tail beat frequency was lower in males swimming in groups than in males swimming individually (2.6 ± 0.1 and 3.8 ± 0.1, respectively). In contrast to the ‘diamond’ shape pattern of many group-wise swimming fish, eels tend to swim in a synchronized fashion parallel to each other, possibly reducing swimming costs by Karman gaiting. Although not an evidence, the present study provides support for the assumption of group migration in European eels.

AB - During migration, swimming in schools provides fish with a number of behavioural and ecological advantages, including increased food supply and reduced predation risk. Previous work shows that carangiform and tunniform swimming result in energetic advantages for individuals using a diamond swimming formation. However, little is known about the potential energetic advantage associated with schooling for anguilliform fish, such as European eel. European eels migrate over a long distance to their spawning area in the Sargasso Sea and may experience energetic advantages when swimming in schools. In this study the effect of group-wise swimming on the cost of transport was tested. In addition, the swimming pattern of eels swimming in groups was studied. Male silver eels were individually subjected to an increased velocity test (0.4–0.9 m s- 1) with increments of 0.1 m s- 1 every 2 h. Groups comprising of seven males were swum following the same protocol. Video recordings were obtained to analyse tail beat frequency at the various water speeds. At all swimming speeds the oxygen consumption was significantly lower in group-wise vs. individually swimming males. The cost of transport at the optimal swimming speed of group-wise swimming males was significantly lower than that of the individually swimming males (21.3 ± 3.2 vs. 32.0 ± 0.6 mg O2 kg- 1 h- 1, respectively). The optimal swimming speeds, however, were not significantly different (0.57 ± 0.02 and 0.52 ± 0.04 m s- 1 respectively). At speeds of 0.50 m s- 1 and above, tail beat frequency was lower in males swimming in groups than in males swimming individually (2.6 ± 0.1 and 3.8 ± 0.1, respectively). In contrast to the ‘diamond’ shape pattern of many group-wise swimming fish, eels tend to swim in a synchronized fashion parallel to each other, possibly reducing swimming costs by Karman gaiting. Although not an evidence, the present study provides support for the assumption of group migration in European eels.

KW - tail beat frequency

KW - fish schools

KW - embiotoca-lateralis

KW - oxygen-consumption

KW - efficiency

KW - speeds

KW - energetics

KW - migration

KW - sargasso

KW - benefits

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DO - 10.1016/j.jembe.2013.05.015

M3 - Article

VL - 448

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JO - Journal of Experimental Marine Biology and Ecology

JF - Journal of Experimental Marine Biology and Ecology

SN - 0022-0981

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