A moray is a type of eel (any type in the Muraenidae family).1
Mores are the shared habits or characteristics of a group. The word is almost always used in the plural. It comes from Latin, where mores is plural for mos, which means custom.2
Examples
Mores
Jobs fully embraced the hippie-dippie mores of his native Northern California: he dropped acid, smoked dope, lived in a commune. [Salon]
Ozon’s pointedly colourful depiction of the mores of mid-70s French society is mildly subversive fare. [Guardian]
Their job, as they saw it, was to protect minorities from the depredations of middle-class mores. [The Australian]
References
1. http://en.wikipedia.org/wiki/Moray_eel ^
2. http://www.oed.com/view/Entry/122201 ^