A bluestripe is any of various types of fish which bear a blue stripe, including the bluestripe darter, the bluestripe clownfish, and the bluestripe shiner.
Bluestripe snapper was created in 1775.
Belcher's sea snake (Hydrophis belcheri) - a highly-venomous species that inhabits the seas off the coasts of the Phillipines, New guinea and Australia. See the related link to Wikipedia for an article on the species. There is a picture to the right of the article - if you click it, it will show an enlarged image so you can see it in more detail.