Recently, I've passed through a phrase "a fish" in several serious contemporary books on international politics. Is "fish" coming to be used as countable?
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Fish is countable when referring to an animal.
It is uncountable when referring to food as a substance.
This is not a recent development.
As a countable noun, its plural form is irregular: it can be fish or fishes.
Since we commonly treat fish as food as uncountable, we often say, for example, I had some fish for dinner, even if we ate one fish. That may help explain why you may have concluded that it was always uncountable.
Learner's dictionaries and some other dictionaries give information on the countability of nouns. See, for example, http://dictionary.cambridge.org/dictionary/learner-english/fish_1?q=Fish.