When Carp or Goldfish That Are Acclimated to Warm Temperatures

When carp or goldfish that are acclimated to warm temperatures are subsequently acclimated to colder temperatures, their swimming performance is impaired initially but then improves over time. Which of the following is thought to be the most likely explanation?

A) Shifts in myosin isoforms and shifts in isozyme forms for glycolysis and the Krebs cycle
B) Shifts in myosin isoforms, but no shifts in isozyme forms for glycolysis or the Krebs cycle
C) Shifts in isozyme forms for glycolysis and the Krebs cycle, but no shifts in myosin isoforms
D) Shifts in the amounts of enzymes for glycolysis and the Krebs cycle, but no shifts in myosin isoforms