Houndfish “Tylosurus crocodilus”, it is also often called the Crocodile Needlefish

Snorkel mask fitting guide. Correct snorkel mask fitting is potentially one of the most important things for having a good time snorkeling. If it leaks or is uncomfortable it can be miserable. Learn how to choose the correct size and type of mask for your face shape, and how to test to see if it is the perfect fit, before you buy or rent it. What you are looking for is an airtight seal around your face, without having the mask too tight.