invasive species mnemiopsis leidyi, the warty comb jelly or sea walnut in pula

animal aquarium aquatic atlantic ocean biology bioluminescence bolinopsidae closeup comb jelly jellyfish croatia ctenophores fish stock float invasion invasive species invertebrate istria marine life mediterranean mnemiopsis leiydi oval pacific predators pula scuba diving sea walnut shore swimming tentacles translucent transparent tropical underwater photography scene vertebrate warty water wild wildlife