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Swimming Speed and Metabolic Rate during Routine Swimming and Simulated Diel Vertical Migration of Sergestes similis in the Laboratory

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Title: Swimming Speed and Metabolic Rate during Routine Swimming and Simulated Diel Vertical Migration of Sergestes similis in the Laboratory
Authors: Cowles, David L.
Issue Date: Jul 2001
Publisher: University of Hawai'i Press
Citation: Cowels DL. 2001. Swimming speed and metabolic rate during routine swimming and simulated diel vertical migration of Sergestes similis in the laboratory. Pac Sci 55(3): 215 - 226.
Abstract: Sergestes similis (Hansen, 1903) is a common mesopelagic vertically
migrating shrimp common in the temperate and subarctic North Pacific Ocean.
The species is a diel vertical migrator, although it remains primarily above the
oxygen minimum layer in regions such as off California where the layer is well
developed. This shipboard study with a computer-controlled swim tunnel provided
the first continuous examination of this species' swimming behavior and
metabolism over a 24-hr cycle. Sergestes similis swam at a routine speed of
around 4.4 to 4.95 cm sec-I. Burst speeds ranged from 14 to >20 cm sec-1.
Swimming speeds during the day, at low temperatures simulating those at daytime
depths, were similar to those at night at the higher temperatures characteristic
of the surface. Night metabolic rates were higher than in the day,
especially during the early night when most feeding activity may take place.
Swimming speeds during times of simulated vertical migration averaged slightly
faster than those of routine day or night swimming, averaging 6.2 cm sec- l
during the time of upward migration and 5.4 cm sec-1 during simulated downward
migration, but the difference was not significant. Downward migration is
not accomplished by passive sinking. Calculations based on observed swimming
activities and metabolic rates indicate that vertical migration confers a clear
metabolic energy savings to S. similis over remaining resident in surface waters,
though this result may not be applicable to other vertical migrators and is likely
moderated by decreased feeding opportunities at depth.
Pages/Duration: 11 pages
ISSN: 0030-8870
Appears in Collections:Pacific Science Volume 55, Number 3, 2001

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