the rock goby (gobius paganellus), fish at night in an underwater cave in western crimea, tarkhankut peninsula

western crimea tarkhankut peninsula underwater cave male gobius punctipinnis capitonellus black sea rock goby actinopterygii gobiiformes fish nature wildlife undersea fauna biodiversity wild marine species saltwater under the life color pattern open water masking salt camouflage mimic colouring vertebrate floor paganellus