8 MARVELS OF FISH LIFE 
whether the attitudes of a fish in a tank are the same 
as those of a fish when swimming free in its native 
element. When a fish is sufficiently tame the attitudes 
in the glass tank are exactly the same as those when the 
fish is free. I am able to make this statement from 
observing pike, perch and other fish in the observation 
pond, where rapid photography is not always possible. 
Though the attitudes shown are natural, I would 
not like the reader to think that this is how a perch or 
pike appears to a dace in the water. Protected by 
colour arrangement and markings, which will be de- 
scribed later, the stealthy approach of the pike is 
extremely difficult to detect, and to illustrate this I 
show a photograph of a pike watching a roach, taken 
through five feet of water in the observation pond. 
The pike, though not easily seen, is sharp in focus, and 
every fin ray of the fully extended erect fin on his 
beck can be counted. While under observation this 
pike followed up the roach, and I was able to take a 
photograph with the beast coming towards me. 
Can fish remember? I think the answer is that 
fish very soon forget an incident, but when that incident 
is repeated several times it leaves an impression on 
their brains, which conveys to them a certain meaning. 
The pike photographed in the pond was caught on a 
spoon bait at two p.m., and kept in a basket surrounded 
with wet grass until six p.m. He was then revived under 
a tap, given a dose of weak whisky and water, and turned 
into the pond. The pond was full of fish, and at lunch 
