Plural of fallfish; multiple specimens of the small freshwater fish Semotilus corporalis.
Simple plural of 'fallfish' formed with '-es' (standard plural for words ending in '-fish'). This biological term maintains the etymology of the singular form.
Fallfish populations are used by biologists as environmental indicators—if a stream loses its fallfishes, it's a sign the water quality has seriously degraded, making these 'trash fish' actually crucial canaries in the coal mine of stream health.
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