Final answer:
A manager should reject a delivery of fresh fish if it has an ammonia-like odor, as this indicates the presence of amines associated with dead fish and decay.
Step-by-step explanation:
A manager should reject a delivery of fresh fish if it has an ammonia-like odor. This odor indicates the presence of amines, such as putrescine and cadaverine, which are associated with dead fish and decay. These volatile amines give off a foul smell that is undesirable in fresh fish.