The ejection of ink was not observed in trial 5 or 6. The first air
gun signal in trial 4 was received at the cage at 162 dB re 1
l
Pa
2
.s
whereas in trial 5 and 6 the air gun was started further away from
the cage and therefore the signal received by the squid was lower
at the beginning of the trials that is, 136 dB re 1
l
Pa
2
.s and
144 dB re 1
l
Pa
2
.s, respectively. However, although the intensity
of the air gun signal did exceed 162 dB re 1
l
Pa
2
.s in both trial 5
and 6, the squid did not display the inking behaviour. This result
is only preliminary, but it would appear that the responses dis-
played by the squid are somewhat dependant on the animals
becoming accustomed to the noise at low levels.