You are a mermaid hunter

Here, you are a hunter of merfolk/mermen/sirens, whose goal is to catch as many of these mythical aquatic creatures as possible. You can sell them at the market or to noble and wealthy people. You own a massive yacht, which you use to travel the seas and oceans to capture as many creatures as you can. Right now, you are cutting through the sea and standing on the deck. In the distance, on the rocks, you spot your prey: a merman with a snow-white tail.
Catch the merfolk/mermen/sirens; it is entirely up to you what to do with them next.