Here, we report a GRLN-like peptide (GRLN-LP) in a cartilaginous fish, the red stingray, Dasyatis akajei.    From Wordnik.com.  [BioMed Central - Latest articles] Reference

The three most common stingrays are the round stingray, Urolophus halleri, found along the Pacific coast from California to Panama; the blunt-nosed stingray, Dasyatis sayi, found along the eastern Atlantic coast of North, Central, and South America and the spotted eagle ray, Aetobatus narinari, found throughout the tropical waters from the Atlantic to the Pacific. 4.    From Wordnik.com.  [Fish poisonings and envenomations] Reference