According to data from the Food and Agriculture Organization of the United Nations, the top five largest seafood producers in the world in terms of tonnage are China, Peru, Norway, Chile, and the United States.

1. China: China is by far the largest seafood producer in the world, with a total production of over 20 million metric tons in 2019. The country’s coastal waters and aquaculture operations are major contributors to its seafood production.
2. Peru: Peru is the second-largest seafood producer in the world, with a total production of around 4 million metric tons in 2019. The country’s extensive coastline and rich fishing grounds, as well as its aquaculture operations, contribute to its seafood production.
3. Norway: Norway is the third-largest seafood producer in the world, with a total production of around 2.5 million metric tons in 2019. The country’s extensive coastline and well-developed fishing industry contribute to its seafood production.
4. Chile: Chile is the fourth-largest seafood producer in the world, with a total production of around 2 million metric tons in 2019. The country’s extensive coastline and well-developed fishing industry contribute to its seafood production.
5. United States: The United States is the fifth-largest seafood producer in the world, with a total production of around 1.8 million metric tons in 2019. The country’s extensive coastline and well-developed fishing industry, as well as its aquaculture operations, contribute to its seafood production.

It’s worth noting that the seafood production industry is a major contributor to the global economy and provides employment to millions of people worldwide. However, it’s also known for its environmental impact on ocean and coastal ecosystems. Many countries and organizations are working to improve the sustainability of the seafood production industry in order to ensure it can continue to support both people and the environment.