Table 4 Arguments raised against the GOLT: Mistaking cause and effect.

4.1It was suggested (42)
that because “the
activity of
oxidative enzyme
falls with body
mass in fishes (53),”
larger/older fish
need less oxygen
anyway. Thus, it is
not necessary to
maintain a high O2
This is mistaking
cause and effect:
Fish shift from
oxidative to
glycolytic enzymes
because their
relative O2 supply
declines. This was
well understood by
earlier authors (57),
who attributed the
shift from oxidative
to glycolytic
enzymes, if
tentatively, to “[l]
imitation on
[which] may derive
from surface-
4.2Lefevre et al. (42)
wrote “In our field,
it is generally
accepted that a
species’ oxygen
determines the
size of their [sic]
respiratory surface
area, not the other
way around.”
Something being
accepted” within
one’s field is not
evidence of its
validity. Thus, e.g.,
plate tectonics was
not mentioned in
geology textbooks
and generally not
accepted by
geologists… until
it was (163).
4.3There is “a large body
of evidence
that respiratory
surface areas in
fishes reflect
metabolic needs,
not vice versa,
which explains the
large interspecific
variation in scaling
of gill surface
areas” (42).
There is no such body
of evidence.
Rather, the O2
consumption of
fish is generally
assumed to reflect
their “needs.” What
is missing are tests
of whether the
supply of O2 by the
gills to the body
(always) satisfies
the O2 demand of
the fish tissues. It
does not in large
adult fish, which is
the reason why
they switch from
oxidative to
glycolytic enzymes