noun
chinook salmon; king salmon
A species of Pacific salmon; the name is used in Japanese for the fish itself and in culinary contexts.
マスノスケは北太平洋で獲れる大型のサケです。
The chinook salmon is a large salmon caught in the North Pacific.
この寿司にはマスノスケが使われている。
This sushi uses chinook salmon.
The reading ますのすけ is a native Japanese name for the chinook salmon. The kanji 鱒の介 and 鱒之介 are ateji (phonetic equivalents) and not etymologically related to the meaning.