84 MARVELS OF FISH LIFE 
markings, for on his sides, back, and head are seen 
numerous black dots and cross markings. If the trout 
were merely silvery all over, he would only be completely 
inconspicuous when the background against which he 
was seen was of the same uniform shade as the water 
around, but the trout in the sea moves among stones, 
weeds and the numerous forms of animal and vegetable 
life floating in the sea. The silvery sides reflect the tone 
of the surrounding water, and the black dots just suffi- 
ciently break up the uniformly shaded body of the fish 
to give it a mottled appearance as he rapidly swims 
about. I have noticed both rainbows and Loch Levens 
swimming in the pond amongst roach and dace, and 
there is no doubt that the rainbow and the Loch Leven, 
with their black spots and marks, are less conspicuous 
than the roach and dace, except when seen against a 
perfectly uniformly shaded background, which is a con- 
dition seldom, if ever, met with in the sea. 
Though I would not say that the sea-trout is a brown 
trout that has gone to sea, it is certainly more closely 
related to the trout than to the salmon, and for this 
reason I consider the name of sea-trout more applicable 
to this fish than salmon trout. 
Next, let us turn our attention to the bull trout. 
One is frequently asked, what is a bull trout? A bull 
trout would appear to be nothing but a large sea-trout. 
At the same time, I am convinced that many a brown 
trout that has acquired the habit of going to sea, on its 
return to fresh water has been described as a bull trout. 
