ctenophores, predatory comb jellyfish invader to the black sea, jellyfish beroe ovate, devouring mnemiopsis leidy

animal aqua bay beroe beroida beroidae black column comb crimea ctenophore diving ecological environment exotic fauna hydrobionts introduced invader invading invasia invasion invasions invasive invertebrates jelly jellyfish leidy life marine medusa mnemiopsis nature nuda ocean odessa ovata predator scuba sea seahorse shipping shooting species swim undersea underwater water wildlife