What advantages does a cage grow-out system offer?

A cage grow-out system offers several advantages, and one significant aspect is its utilization of existing waterways, which facilitates easy movement of the system. This means that the cage can be placed in natural water bodies such as lakes, rivers, and oceans, allowing for efficient use of space and resources. It also simplifies transportation access for fish feed, harvesting, and maintenance. The ability to leverage existing waterways contributes to the system's efficiency by minimizing the need for extensive infrastructure development.

The other options present various considerations that do not align with the unique benefits of cage systems. For instance, while feeding fish in a cage setup can be convenient, it does not uniquely stand out as an advantage compared to other systems like pond or tank systems. Likewise, the claim of no exposure to wild species and predators overlooks the reality that cage systems often remain vulnerable to these external factors due to their placement in natural environments. Lastly, while cost is a crucial factor, claiming that a cage system is the least expensive option does not universally apply without considering specific operational contexts and local market conditions. Thus, the key advantage lies in the effective use of natural waterways, which enhances movement and operational efficiency.