Effects of temperature and body size on the swimming speed of larval and juvenile Atlantic cod (Gadus morhua): Implications for individual-based modelling
Authored by MA Peck, LJ Buckley, DA Bengtson
Date Published: 2006
DOI: 10.1007/s10641-006-0031-3
Sponsors:
United States National Oceanic and Atmospheric Administration (NOAA)
Platforms:
No platforms listed
Model Documentation:
Other Narrative
Mathematical description
Model Code URLs:
Model code not found
Abstract
The routine swimming speed (S) of three groups of 4, 9 and 32 cm total
length (L-T) juvenile cod (Gadus morhua) was quantified in the
laboratory at 6 - 10 different temperatures (T) between 3.2 and 16.7
degrees C. At temperatures between 5 and 15 degrees C, mean group S
increased exponentially with increasing T (S= a e(bT)) and the effect of
temperature (b= 0.082, Q(10)= 2.27) was not significantly different
among the groups (over the 8-fold difference in fish sizes of early- and
post- settlement juveniles). Differences in mean S among individuals
within each group were quite large ( coefficient of variation= 40-80\%).
Swimming data for juveniles and those collected for groups of 0.4, 0.7
and 0.9 cm standard length (LS) larvae were combined to assess the
effect of body size on S. At 8 degrees C, S (mm s(-1)) increased with
L-S (mm) according to: S= 0.26L(S) (Phi) -5.28L(S)(-1), where Phi=
1.55L(S)(-0.08). Relative S (body lengths s(-1)) was related to L-S by a
dome-shaped relationship having a maximum value (0.49 body lengths
s(-1)) at 18.5 - 19 mm L-S corresponding to the sizes of fish at the end
of larval-juvenile metamorphosis. Previous larval cod IBM's using a
cruise-predator mode likely overestimated rates of foraging (prey
searching and encounters) by a factor of similar to 2, whereas foraging
rates in pause-travel models are closer to estimates of swimming
velocities obtained in this and other laboratory studies.
Tags
Metabolism
behavior
Performance
Environments
Growth-rate
Survival
Georges-bank
Haddock melanogrammus-aeglefinus
Class strength
Fish
larvae