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Physiology
Fish Innate Immunity
The rapid, non-specific first line of defense in fish - mucus, complement proteins, phagocytes, and antimicrobial peptides.
System: Circulatory Level: Advanced Discipline: Endocrinology
📖 Overview
Because fish live suspended in a bacterial soup, their innate immunity is exceptionally well-developed. Skin mucus contains antimicrobial peptides, immunoglobulins, and enzymes; complement proteins circulate in blood; phagocytes patrol every tissue. Innate immunity is faster than adaptive immunity - critical when infection can spread through open wounds in seconds.
🔑 Key Concepts
Mucosal immunity, complement cascade, antimicrobial peptides (AMPs), phagocytes.
🎯 Applications
Understanding innate immunity is central to aquaculture health, farm biosecurity, and vaccine development.
✨ Fun Fact
Fish skin mucus contains piscidins - antimicrobial peptides so potent they are being investigated as templates for human antibiotic development.