Shetland Fish Processors' Association and Shetland Shellfish Growers Association (SSGA) are to amalgamate and become Seafood from Shetland.
Chief executive of SFPA Ruth Henderson said: "We look forward to the many opportunities that we can exploit together. We are already working hard to raise the profile of Shetland seafood in the marketplace and I am confident the inclusion of SSGA members will give added strength to our promotional activities."
SSGA represents 95% of Shetland's shellfish farmers.
Shetland salmon farmers have been given an £87,500 boost to help promote and market products by the EU and the Scottish Executive.