Catfish are scientifically known as Siluriformes. They are a various group of fish that have fins supported by thin bony rays. More than ***0 species of catfish are scattered in all continents except for Antarctica. Catfish lives in freshwater ecosystems such as rivers and streams but some species of catfish can also live in saltwater and caves. Aquaculture farmers choose this type of fish to farm the most because people eat catfish as a specialty food around the world. Overfishing and water pollution are two of the reasons that some types of catfish such as Mekong catfish are highly in danger of extinction.
Catfish have specific features such as smooth, slightly flat, and long whiskers sticking out from around their mouth. Catfish have no scale; instead, their bodies are covered in slippery mucus to protect them from bacteria when out of the water and to breathe through the skin in some species. In some species of the Siluriformes order, a tough layer of bony plates or scutes covers the body of catfish to protect them from predators. Catfish are mostly identified by their wide flat heads and long whiskers called barbels that hang out from their mouth.

Vannamei shrimps are graded based on the land they are farmed. The lighter the color of the Vannamei shrimp, the higher the quality or the grade is. A1 grade is the best quality of vanami shrimps and A5 is the lowest grade or quality. Wholesale vannamei shrimps with A1 grade are often sold to the European Union countries and Russia. The only type of shrimps that are known as farmed shrimps and produced in large volumes all over the world are the vannamei shrimps.