While I wasn't present on your particular field
trip; I think I know to which fish you are
referring. The California Sheep head, like other
wrasses all start out female and following
specific, and yet to be fully understood
environmental cues, become males later in life.
This is in contrast to the anemone fish (the group
to which "Nemo" belongs). In this group, the
juveniles are all male and it is thought that
through the development of a dominance hierarchy,
the most territorial individual becomes female,
which in most species is clearly the largest of a
male / female pair.
Regarding your octopus
question: Octopus are remarkably agile and, as a
result, are notorious aquarium escape artists.
Unfortunately I do not know what the particular
octopus in question ate on its incredible journey
away from its home aquarium.
The next time
you have the opportunity to visit the REEF, you
might ask the tour guides this same question.
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