Visual survey by divers using open-circuit (OC) SCUBA is the most widely used approach to survey coral reef fishes. Therefore. it is important to quantify sources of bias in OC surveys. such as the possibility that avoidance of OC divers by fishes can lead to undercounting in areas where targeted species have come to associate divers with a risk of being speared. https://tftoyes.shop/product-category/magic-the-gathering/