Pollack are the most active members of the cod family. They are deep, plump bodied fish that have three dorsal fins, two anal fins and a forked tail fin, with slightly projected lower jaw. Pollock average between 4 and 15 pounds in weight, although large ones can weigh to 35 pounds. Over fished commericially in the 1980s, they are still caught commercially in smaller numbers and are a hook and line recreational fish. They make strong, powerful runs, thus making them fun to catch on light tackle.