head-and-tail light

[ hed-n teyl ]
/ ˈhɛd n ˈteɪl /

noun

a small South American characin fish, Hemmigrammus ocellifer, having shiny red eyes and tail spots, often kept in aquariums.
Also called head-and-tail-light fish.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019