The melon-headed whale shark is occasional because it mostly life in rigorous waters, where couple people go. And also the bonnethead shrimpfish is rare since it lives totally in salt h2o, in which less individuals go. All of these are great environments for rare fish to reside in. But Otherwise, https://www.diigo.com/item/note/9tt3x/whmt?k=e010b5903140773401617669db35102c