Add 1 Level 7 or lower monster from your Deck to your hand, that mentions "Umi", or is a WATER Normal Monster, then if "Umi" is on the field, you can Special Summon 1 WATER Normal Monster from your Deck. You can only activate 1 "Fish Sonar" per turn.
We are a participant in the Ebay Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Ebay.com and affiliated sites.