The correct answer is Rohu.
Rohu is a species of carp native to the Indian subcontinent. It is a freshwater fish that is commonly found in rivers, lakes, and ponds. Rohu is a popular food fish and is also used in aquaculture.
Catla is another species of carp that is native to the Indian subcontinent. It is a freshwater fish that is commonly found in rivers, lakes, and ponds. Catla is a popular food fish and is also used in aquaculture.
Mrigal is a species of carp that is native to the Indian subcontinent. It is a freshwater fish that is commonly found in rivers, lakes, and ponds. Mrigal is a popular food fish and is also used in aquaculture.
Hilsa is a species of shad that is native to the Indian subcontinent. It is an anadromous fish, meaning that it lives in the ocean but spawns in freshwater. Hilsa is a popular food fish and is also used in aquaculture.
Rohu is the most commonly caught fish in Assam because it is a hardy fish that can tolerate a wide range of water conditions. It is also a fast-growing fish that can reach a large size. Rohu is a popular food fish and is also used in aquaculture.