rockpool shrimp, invasive transparent saltwater decapod crustacean search food with pereiopod and antenna, sponge and green algae

palaemon elegans palaemonidae decapoda adult brackish odesa bay atlantic ocean actinia equina sea anemone mytilaster lineatus mollusc invasion water clear natural instinct design animal aquatic fishkeeping underwater decorative ornamental closeup sand substrate wild fauna macro widespread reef space header nano pico environment exotic marine life aquascape aquaculture concept biodiversity easy prawn enduring captive controlled conditions pet vulnerable