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iasgairfishermanmasculine noun
the
an t-iasgair
after a preposition
an iasgair
of the
an iasgair
plural
iasgairean
the (plural)
na h-iasgairean

Every form but the headword, the genitive and the plural is worked out by the spelling rules in the grammar guide, so what you see here is what the guide teaches. Awaiting a fluent speaker’s review.