Specialization in colonies was very crucial to their development, just as much as it was to modern society. Nearly no family lives purely from what they produce, they produce or excel in one thing and sell their labour in that field or the fruit of the labour from that field in order to buy things that they cannot produce. That is largely how it was in the colonies, with the colonies trading with each other for goods that the citizens wanted. The specialization of these colonies was mostly determined by the land they were settled. A inshore colony would definitely not work in fishing, because that would be very difficult, if not impossible.
The following is a list of colonies, with their primary production.
Connecticut – Farming, Fishing
Delaware – Fishing, Farming
Georgia – Rice and Wheat
Maryland – Tobacco and Wheat
Massachusetts Bay – Agriculture, manufacturing
New Hampshire – Farming and Fishing
New Jersey – Wheat
New York – Agriculture
North Carolina – Tobacco, Cotton, Rice
Pennsylvania – Corn, Wheat
Rhode Island – Fish, Timber, Fur
South Carolina – Tobacco, Cotton, Rice
Virginia – Tobacco , Cotton, Rice
As you can see, most colonies produced some sort of food. That is obviously because everybody needs food to live, and it would be hard to import fresh things. An interesting trend is that the southern colonies are more for profitable or luxurious things, because they were founded for raw materials, than the Northern Colonies, which were mostly founded to avoid religious persecution.