How do shellfish fit into sanitation programs?

• A. Used as bacterial indicators of fecal contamination
• B. As primary disinfectants
• C. As neutralizers for toxins
• D. As growth promoters

Answer: (A)

Shellfish serve as bioindicators of fecal contamination in sanitation programs because they are filter feeders that concentrate bacteria from the surrounding water. When water is contaminated with fecal matter, shellfish tend to accumulate indicator organisms such as fecal coliforms and E. coli in their tissue. Monitoring these indicators in harvesting areas (and sometimes in the shellfish themselves) provides a practical signal of water quality and potential health risk, guiding closures, depuration, or other treatment to protect consumers. They are not used as disinfectants, neutralizers for toxins, or growth promoters; their value lies in reflecting the level of fecal contamination in the environment.