close-up picture of sea cucumber in its natural environment, on a rock, marine life(stichopus japonicus

animal cucumber ecosystem collagen human marine recycle skin consumption nutrients systems body aquaculture elongated aquatic dive diving reef underwater coral fish invertebrate ocean tropical blue nature red seafood water colourful deep disease floor pacific tropics wildlife chinese food egypt life sand turtle undersea indonesia snorkeling burma edible close-up sea natural environment rock lifestichopus japonicus japonicus