wide spread bivalve mollusc mytilaster filter water for food in black sea saltwater marine biotope aquarium, macro shot of a stone

active adult animal aqua aquaculture aquarium aquascape aquatic background biodiversity biotope bivalve black body clear closeup colorful concept design environment estuary exotic fauna filter filtrator fish fishkeeping food free funny instinct introduced invasion invasive invertebrate life lineatus live macro marine mollusc mytilaster native nature reef salinity saltwater sea shell shot space spread stone substrate syphon tank underwater useful valuable water wide widespread wild