虹鱒

1. Origins, structure, and basic meaning

• Structure: 虹鱒, read にじます, is the fish noun rainbow trout.
• Basic usage: 虹鱒が泳ぐ refers to the live fish; 虹鱒を塩焼きにする treats the catch as food to grill.

2. Common pitfalls and similar expressions

• Living fish and food context
  • The river clause predicates a living animal's motion, whereas 塩焼き shifts the same noun to a culinary referent.