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как рыба в воде stresses
gen.	in his element; take to something like a duck to water
idiom.	catfish to a crawdad (Махонский); in their element (MichaelBurov)
Makarov.	in one's sphere; like a duck to water
proverb	take to something like a duck to water
slang	up one's alley
быть, чувствовать себя как рыба в воде
proverb	take to like a duck to water

как рыба в воде: 15 phrases in 6 subjects

General	5
Idiomatic	2
Informal	1
Makarov	3
Psychology	2
Slang	2