Grouper. The most common species, this is reddish or yellowish brown particularly popular in North Africa. Being firm and dense, and relatively bone-free, makes it good for poaching or grilling. Good cold. May also be the dogtooth grouper.
Saganaki refers to various dishes cooked or fried in a small pan/dish with two handles which is called a sagani (diminutive=saganaki). Cheese, prawns (US: shrimp) and mussels are all very popular saganakia.
A small pan/dish with two handles in which 'saganakia' are fried, often cheese, prawns (US: shrimp) or mussels.