How should a small vessel display its lights when engaged in fishing at night?

When a small vessel is engaged in fishing at night, it is required to display specific lights to ensure visibility and safety on the water. The correct answer involves using an all-round white light along with fishing lights. The all-round white light is visible from all directions and serves as a signaling device to other vessels that the boat is occupied and engaged in fishing activities.

Fishing lights, which may include red and green lights or specific lights designed for fishing purposes, help indicate that the vessel is fishing and may be moving more slowly than other types of craft. This is particularly important for preventing collisions and ensuring that other vessels are aware of the fishing operation.

In contrast, displaying only a white light or a combination of red and green lights alone would not adequately communicate the vessel's activities to other boaters. Furthermore, having no lights required would pose a significant safety risk, as the vessel would become difficult to see, potentially leading to dangerous situations on the water. Thus, it is essential for fishing vessels to properly illuminate themselves with the necessary lights as stated in the correct answer.