Where can examples of semantic deviation be found in the following text, and what are the effects?
He roared with laughter to show it was a joke. On the wall of the cabin was a laminated chart showing the different stages of rearing farmed salmon: the freshwater hatchery where the broodstock was reared to become alevins, then fry; the cages where the salmon parr were released
and grown to smolts; the big cages further out in the saltwater of the loch where the smolts were ranched to become mature salmon. Archie led us through all this and then, when it was obvious we had had enough, suggested a tour by boat.
There was a converted fishing boat tied up to a jetty; we climbed in and slowly chugged out into the middle of the loch. Now that we were close we could see the metal structures were a series of booms which formed the tops of deep cages moored to the bed of the loch. The water inside these booms was frantic with movement, boiling with the desperate churning of tens of thousands of fish which all wanted to be somewhere else. Every few seconds a fish would leap out of the water as if it was
attempting to escape or climb some fish ladder or run up some waterfall that its instincts or its race memory told it should be there. I could hardly bear to look. Here was a creature whose most profound instincts urged it to swim downriver until it could smell the saltwater of the ocean and then find the feeding grounds of its ancestors in the far north of the Atlantic, where it would live for the next two to three years. And then, by an even greater miracle, it would return south, travelling past the mouths of all of the rivers where it might have been born until something made it turn north again, searching the coastal waters until it smelt or sensed in some other way the river waters that led to the place where it had been spawned. But these salmon spent their whole lives in a cage a few metres deep and a few metres wide. 'Look at the little darlings,' said Archie Campbell fondly. 'Look at all the exercise they get. Don't tell me they aren't every bit as fit as wild salmon.'
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