If this card is used for the Xyz Summon of a "Number" monster, it can be treated as a Level 3 or 4 monster. If all monsters you control are WATER (min. 1): You can Special Summon this card from your hand, and if you do, add 1 Level 3, 4, or 5 Fish monster from your Deck to your hand, except "Abyss Shark". For the rest of this turn, you cannot Special Summon monsters, except WATER monsters, also, double the first battle damage inflicted to your opponent this turn by your "Number" monster battling another monster. You can only use this effect of "Abyss Shark" once per turn.