Cod can refer to both Atlantic and Pacific species. Overall, cod is a moist and mild fish, that works in numerous applications including frying, baking and sauteing. Cod is firm and flaky when cooked. The Atlantic version is sweeter and more firm than its Pacific counterpart. Fresh cod is available year-round. Available frozen year-round and fresh during season.
Check out Black Cod (also known as Sablefish). Seasonal availability.
Also look at Ling Cod. Seasonal availability.
Use Atlantic and Pacific cod interchangeably, except in the case of breading/frying use Atlantic. Cod cooks quickly and benefits from a moist heat. Alternatives include Haddock and Pollock.
(Email) Buttered Cod in a Skillet