Which animals were introduced into the Caspian Sea by ships or people?

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Several animal species have been introduced into the Caspian Sea through human activity, either accidentally or by design:

  • Transported by vessels: Organisms such as barnacles, crabs, and clams have been introduced to the sea via transport on ships.1
  • Deliberately introduced: Gray mullets were intentionally introduced into the ecosystem by humans.1
  • Other introductions: The comb jellyfish has also become established in the Caspian Sea, where it poses a threat to the food supply of native fish by consuming zooplankton.2