You can only use the 1st and 2nd effect of this card’s name each once per turn.
(1) Special Summon 1 Level 4 or lower Fish, Sea Serpent or Aqua monster from your hand or GY, and if you do, you cannot Special Summon from the Extra Deck while you control it, except Xyz Monsters.
(2) If your opponent controls an Attack Position monster: You can banish this card from your GY, then target 1 Fish, Sea Serpent, or Aqua monster you control; it gains 1000 ATK until the end of this turn.