noun
A cold-water fish (Salvelinus alpinus) found in Arctic and subarctic regions.
ホッキョクイワナは北極圏の川や湖に生息している。
Arctic char inhabit rivers and lakes in the Arctic region.
Compound of 北極 (ほっきょく, 'Arctic') and 岩魚 (いわな, 'char'). The exact derivation is straightforward; the word is a modern taxonomic name.