What is a biofilm?

What is a biofilm?

• A. A substance applied to tank walls to minimize light in the tank
• B. Microorganism build-up on the tank wall
• C. An ultraviolet filter that reduces the microorganisms in the tank
• D. A lighting system for semi-aquatic species

Answer: (B)

A biofilm is a community of microorganisms that attach firmly to a surface, such as the inside wall of a tank, and produce a sticky, protective matrix called extracellular polymeric substances. This slimy layer helps the microbes adhere, share nutrients, and resist cleaning or disinfection. In aquatic housing, biofilms commonly form on tank walls, pipes, and filters where moisture and nutrients are available. They can harbor bacteria and other pathogens, impacting water quality and animal health. Therefore, the statement that describes microorganism build-up on the tank wall best captures what a biofilm is. The other options describe devices or methods (light-blocking substances, ultraviolet filters, or lighting systems) rather than the microbial community itself.

A biofilm is a community of microorganisms that attach firmly to a surface, such as the inside wall of a tank, and produce a sticky, protective matrix called extracellular polymeric substances. This slimy layer helps the microbes adhere, share nutrients, and resist cleaning or disinfection. In aquatic housing, biofilms commonly form on tank walls, pipes, and filters where moisture and nutrients are available. They can harbor bacteria and other pathogens, impacting water quality and animal health. Therefore, the statement that describes microorganism build-up on the tank wall best captures what a biofilm is. The other options describe devices or methods (light-blocking substances, ultraviolet filters, or lighting systems) rather than the microbial community itself.