nudibranch. squishy

nudibranch squishy slug snail mollusc reef ecosystem environment fish coral underwater marine sea scuba diving tropical wreck seascape shell crustacean diver anemone animal aquarium aquatic blue colourful deep nature ocean snorkelling water wildlife shark whale fauna flora asia coralreef invertebrate island coralfish colony sealife biodiversity depth school travel undersea shrimp crab tambja sp bali indonisia