title: Effect of melatonin and methionine-enkephalin on surfacing responses in goldfish.
mesh_terms: D000818:Animals; D004305:Dose-Response Relationship, Drug; D004723:Endorphins / Q000494:pharmacology*; D004745:Enkephalins / Q000494:pharmacology*; D006054:Goldfish; D008550:Melatonin / Q000096:biosynthesis / Q000494:pharmacology*; D009043:Motor Activity / Q000187:drug effects*; D009270:Naloxone / Q000494:pharmacology; D009619:Nociceptors / Q000187:drug effects*; D010455:Peptides / Q000494:pharmacology; D011957:Receptors, Opioid / Q000187:drug effects
chemical_list: D004723:Endorphins; D004745:Enkephalins; D010455:Peptides; D011957:Receptors, Opioid; C100179:scotophobin; D009270:Naloxone; D008550:Melatonin