What is the difference between Lin Cod and Black Cod?!

What is the difference between Lin Cod and Black Cod?

The black cod or smallscaled cod, Notothenia microlepidota, is a marine cod icefish in the genus Notothenia with distribution ranging from southern New Zealand to sub-Antarctic seas, although they have also been fished off the Great Australian Bight, Chile, and round the Falkland Islands, on rocky reefs. Their length is between 25 and 70 cm, and they may weigh up to 3 kg.

The juveniles are silvery in appearance with a pronounced tail fork. The adult has a less pronounced fork in the tail, with body colors of silver, yellow and reddish-brown. The scales are very small, and there are two lateral lines which have a considerable overlap.

Being a sub-Antarctic species, the black cod has special adaptations such as antifreeze proteins in its blood, as well as adipose tissues to offset its lack of swim bladders, giving it neutral buoyancy.

It should be noted that sablefish (Anoplopoma fimbria) is occasionally called black cod as well, but it is not a true cod. In New Zealand, Maori Cod is also known as "black cod".

The black cod is unrelated to the true cod, and gets its name from the fact that it is a food fish. It is tasty to eat, and is commercially fished.
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The lingcod, Ophiodon elongatus, is a fish of the greenling family Hexagrammidae. It is the only member of the genus Ophiodon.

It is native to the North American west coast from Shumagin Islands in the Gulf of Alaska to Ensenada, Mexico. It has been observed up to a size of 152 cm and a weight of 59 kg. It is spotted in various shades of grey. The lingcod is a popular eating fish, and is thus prized by anglers.

Life history
Lingcod are unique to the west coast of North America, with the center of abundance off the coast of British Columbia. in Alaska there are many that reach 70 lbs. They are found on the bottom with most individuals occupying rocky areas at depths of 10 to 100 m. Tagging studies have shown that lingcod are a largely non-migratory species, with colonization and recruitment occurring in localized areas only.

Starting in October, lingcod migrate to nearshore spawning grounds. The males migrate first, and establish nest sites in strong current areas in rock crevices or on ledges. Spawning takes place between December and March, and females leave the nest site immediately after depositing eggs. Males actively defend the nest from predators until the eggs hatch in early March through late April. The photo to the right shows a nest-guarding male protecting his egg mass.

The larvae are pelagic until late May or early June when they settle to the bottom as juveniles. Initially they inhabit eel grass beds, and eventually move to flat sandy areas that are not typical habitat of older lingcod. They eventually settle in habitats of similar relief and substrate as older lingcod, but remain at shallower depths for several years.