english: These are Mexican guppies, and what you see on their upper maxilla is an outgrowth of epidermal filaments, and these filaments basically form a fish mustache, if you will.
non_english: Ovo su meksički gupiji, i ono što vidite na njihovoj gornjoj vilici su izdanci epidermalnih vlakana, i ova vlakna praktično formiraju riblje brkove, može se reći.