Lampris guttatus. Mean daily depth overlaid with the track contoured temperature–depth structure for opah # 41869 (top) and opah # 41867 (bottom)
The temperature–depth structure the opah encounters is estimated
from a temporal interpolation using the eight pairs of temperature
and depth values from each 4-h period over the duration of the tag
deployment (Fig. 7 ) Overlaid on this vertical structure is
the mean daily opah depth (Fig. 7 ).
The mean daily depth of this opah was about 200 m until about
October 21 when it suddenly shifted to about 150 m for most of
the remaining record (Fig. 7 ).
The shift in mean depth occurred when there was a shoaling of the
temperature–depth structure and it appeared the opah moved
shallower in response to a shoaling of the temperature–depth
structure (Fig. 7 ).
After about 5 days with a mean depth of about 125 m the
opah appeared to have moved into a region with a deeper
temperature–depth structure (the edge of the eddy) and its mean
daily depth increased to 225 m (Fig. 7 ).
About a week later, the temperature–depth structure shoaled
somewhat and the opah moved shallower (Fig. 7 ).
Thus, in both opah, their mean daily depths moved deeper or
shallower coherent with changes in the temperature–depth structure
(Fig. 7 ).
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