What is a tributary?

A tributary is defined as a body of water that flows directly or indirectly into a larger water body, such as a river, lake, or ocean. This definition captures the essential role of a tributary in hydrological systems, where it contributes to the flow and volume of the larger body of water it feeds into. Tributaries can vary in size from small streams to larger rivers, significantly influencing the ecosystem and hydrology of the area.

The other options do not accurately describe a tributary. A large ocean current is unrelated to the concept of tributaries as it pertains to oceanic water movement rather than freshwater tributaries. A type of fish found in freshwater does not relate to the definition of tributaries, and a law regulating fishing practices deals with legal aspects rather than the physical geography of water bodies. Understanding the significance of tributaries in the context of ecosystems and water management is crucial for conservation officers.