Aquaculture International

, Volume 21, Issue 1, pp 177–181 | Cite as

Critical swimming speed and maximum sustainable swimming speed of juvenile Pacific bluefin tuna, Thunnus orientalis

  • F. de la S. Sabate
  • Y. Nakagawa
  • T. Nasu
  • W. Sakamoto
  • S. Miyashita
Article

Abstract

Tank wall collision is one of the major causes of mortality during the early-stage rearing of Pacific bluefin tuna, Thunnus orientalis (PBT). Therefore, to design a rearing environment that meets the needs of juvenile PBT, it is important to gather information about their swimming capabilities. We conducted experiments to examine the relative critical swimming speed (RCSS) and maximum sustainable swimming speed (MSSS) of early-stage PBT. The fish were kept in 3-tonne tanks and fed on artificial pellets every 2 h from dusk to dawn. We conducted two sets of experiments to measure swimming speed; the fish were introduced one at a time into a water funnel, and the water current velocity was gradually increased over time to estimate RCSS, or the water current was kept at a constant velocity to estimate MSSS. We measured the RCSS of 72 PBT juveniles (24–29 days after hatching (DAH); standard length (SL), 15.0 ± 2.3 mm) and the MSSS of 32 PBT juveniles (28–37 DAH; SL, 20.0 ± 5.1 mm) in the laboratory. The RCSS ranged from 4.7 to 20.3 SL/s (average, 12.4 ± 3.3 SL/s), and the MSSS was estimated to be approximately 4 SL/s. We speculate that introducing a water current in the rearing tank of no more than 4 SL/s could positively affect the survival of juvenile PBT.

Keywords

Aerobic swimming velocity Collision death Endurance Juvenile production Rearing environment 

Abbreviations

PBT

Pacific bluefin tuna

SL

Standard length

CSS

Critical swimming speed

RCSS

Relative critical swimming speed

MSSS

Maximum sustainable swimming speed

DAH

Days after hatching

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • F. de la S. Sabate
    • 1
  • Y. Nakagawa
    • 1
  • T. Nasu
    • 1
  • W. Sakamoto
    • 1
  • S. Miyashita
    • 1
  1. 1.Fisheries LaboratoryKinki UniversityShirahama, WakayamaJapan

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