貝毒

1. Origins, structure, and basic meaning

• Structure: 貝毒 (かいどく) is a compound noun for toxin that can accumulate in shellfish and harm consumers.
• Basic usage: 貝毒が貝に蓄積する makes the toxin the subject accumulating in shellfish, while 貝に貝毒がないか調べる tests a collected specimen for its presence.

2. Common pitfalls and similar expressions

• Toxin and host shellfish
  • 貝毒が marks the substance accumulating, while 貝に marks the organism that may contain it. The term does not assert that the shellfish itself produces the toxin.