"Hake" is a general term to describe several species of fish all of them have silver skin with a pink tint. The flesh of "hake" is white and tender. hake do not look like salmon as stated before, but look similar to cod.
The only fish that can be pregnant is fish from the Livebearers family. In the livebearers family when the female is in pregnant it will develop a dark triangular shaped gravid spot near her anal...
May I suggest you first find out which 'Cobbler Fish" you are referring to. There are many fish that have that common name depending on where one lives.
"Oar Fish" is a local name in some places in the south for the fish commonly called the Alligator Gar. You can find pictures of the Alligator Gar online.