Squid
The behaviours observed in the squid in response to air gun
noise exposure could be classified into the same categories as the
observed fish behaviour. That is, alarm responses and changes in
swimming patterns and vertical position. The response of squid
to air gun noise has not been previously reported in the literature.
The squid in trial 4 were observed ejecting ink at the first air
gun signal. The primary function of this response in squid is
thought to be predator evasion (
Hanlon and Messenger, 1996a
).