Rivers and reservoirs in Tamil Nadu support:

The correct answer is: a) Freshwater fish.

Rivers and reservoirs in Tamil Nadu support a variety of freshwater fish species, including carp, catfish, and tilapia. These fish are an important part of the local ecosystem and provide a valuable source of food for humans.

Saltwater fish are not found in rivers and reservoirs in Tamil Nadu, as they require a higher salinity level than freshwater fish. Ornamental fish are also not found in rivers and reservoirs, as they are typically kept in aquariums or ponds. Fish farming is not a major industry in Tamil Nadu, although there are some small-scale operations.

Here is a brief description of each option:

• Freshwater fish: Fish that live in freshwater, such as rivers, lakes, and ponds.
• Saltwater fish: Fish that live in saltwater, such as oceans and seas.
• Ornamental fish: Fish that are kept for their beauty, such as goldfish and koi.
• Fish farming: The practice of raising fish for food or other purposes.