Trout's preferred food

Why is it that some trout would seem to prefer to almost starve rather than eat some insects, yet will gorge on others? As an example are: caddis fly, the grannom, and the mayfly as an instance of the second.

The grannom is unique. On some rivers, hatches of this little brown fly can be so dense that they cloud the air. For hours there will scarcely be a square inch of water that does not have an adult grannom.

Often the grannom provides the year’s first chance of food in abundance for the trout.

But the trout often ignore the grannom hatch until it is almost over. It will only be very late in the flies’ three or four-week emergence that the fish start to eat them.

Trout are opportunistic feeders. If there is food available, they will take it and if there is lots of food available, they will go on taking it until they are full.

Common sense would suggest that after a long winter that the half-starved trout would eat everything in sight. But yet they avoid the grannom for weeks, though there are no obvious differences between it and similar caddis flies that, later in the season, the trout will eat lots off.

Why is it that the trout refuse to eat them could it be that they taste horrible? I do not know this as I have never eating one!

On the other hand trout will gorge themselves on the mayfly.

If trout love the Mayfly and disregard the grannom – even though they must be very hungry – is that the mayfly tastes yummy and the grannom tastes grubby.

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