Spray Fish

From the Super Mario Wiki

A Spray Fish from Super Mario World 2: Yoshi's Island.

Spray Fish are blue fish in Super Mario World 2: Yoshi's Island and Yoshi's Island DS. They appear in several fortresses and castles and shoot out a diagonal jet of water. It's almost like a wall and impossible to go through. Wait for them to submerge or shoot an egg at their head. They themselves can hurt Yoshi, but the water pushes Yoshi back.

It's possible they're related to Cheep-Cheeps and the Blue Blurps from Yoshi's Story. Hot Lips (from the original Super Mario World 2) may also be a lava version of the Spray Fish (as he has an identical, though much more dangerous, attacking pattern).

Yoshi's Island DS

Babies	Baby Mario \| Baby Luigi \| Baby Peach \| Baby Donkey Kong \| Baby Yoshi \| Baby Wario \| Baby Bowser \| Star Children
Worlds	World 1 \| World 2 \| World 3 \| World 4 \| World 5
Items and Objects	Yoshi Eggs \| Coins \| Winged Clouds \| Keys \| Hint Blocks \| Baby Coins \| Super Stars \| Stork Stops \| Red Coins
Bosses	Big Burt Bros. \| Gilbert the Gooey \| Hector the Reflector and the Invisighouls \| Big Bungee Piranha \| Bessie Bass \| Priscilla the Peckish \| Six-Face Sal \| Big Guy the Stilted \| Moltz the Very Goonie \| Baby Bowser \| Bowser
Enemies	Aquatic Enemies Tube Guy \| Pirate Guy \| Nep-Enut \| Boss Bass \| Spray Fish \| Egg-Enut \| Piscatory Pete \| Flopsy Fish \| Blooper Botanical Enemies Crazee Dayzee \| Wild Piranha \| Wild Ptooie Piranha \| Nipper Plant \| Nipper Dandelion \| Windbag \| Pointey \| Eggo-Dil \| Bungee Piranha \| Blow Hard \| Swing Hard \| Drool Hard \| Needlenose-Plant Shy Guys Shy Guy \| Glide Guy \| Woozy Guy \| Fly Guy \| Stilt Guy \| Shy Stack \| Mufti Guy \| Spear Guy \| Dancing Spear Guy \| Fat Guy Subterranean Enemies Blargg \| Super Big Blargg \| Lantern Ghost \| Dizzy Dandy \| Gobblin \| Bill Blaster \| Podoboo \| Zeus Guy \| Gooey Goon \| Hot Lips Land Enemies Koopa \| Para-Koopa \| Burt \| Grinder \| Debull \| Crabble \| Snap Jaw \| Tap-Tap \| Fleeper \| Bumptie \| Bandit \| Green Glove \| Slugger Airborne Enemies Cloud Drop \| Goonie \| Flightless Goonie \| Fang \| Gusty \| Lakitu \| Wall Lakitu \| Baron Von Zeppelin \| Rocket Guy Haunting Enemies Boo Guy \| Ghost Piranha \| Invisighoul \| Boo \| Big Boo \| Skeleton Goonie \| Flightless Skeleton Goonie \| Potted Ghost Giant Enemies Super Big Tap-Tap \| Stompin' Chomp \| Incoming Chomp \| Chomp Shark \| Crusher Blargg

Yoshi series Enemies
Main Antagonists Baby Bowser \| Bowser \| Kamek
Minor Antagonists Bessie Bass \| Big Bungee Piranha \| Bigger Boo \| Big Guy the Stilted \| Burt the Bashful \| Burt Bros. \| Cloudjin \| Cloud N. Candy \| Don Bongo \| Gilbert \| Hector the Reflector \| Hookbill the Koopa \| Inviso \| Marching Milde \| Moltz the Very Goonie \| Naval Piranha \| Prince Froggy \| Priscilla the Peckish \| Raphael the Raven \| Roger the Potted Ghost \| Salvo the Slime \| Six-Face Sal \| Sluggy the Unshaven \| Tap-Tap the Golden \| Tap-Tap the Red Nose
Enemy Classes Dudim Phreykunoutonthis \| Edibilis Boringus \| Harrassimentia Phlyoverus \| Mostosti Vomitonus \| Projectilia Ritebakatchia \| Ucantia Defeatus
Enemies Aerial Snifit \| Aqua Lakitu \| Bandit \| Barney Bubble \| Bat \| Big Boo \| Biting Bullet Bill \| Blargg \| Blooper \| Blow Hard \| Bone Dragon \| Boo \| Boo Balloon \| Boo Blah \| Boo Guy \| Boo Man Bluff \| Bouncy \| Boss Bass\| Bouncing Bullet Bill \| Bowling Goonie \| Bubble Dayzee \| Bullet Bill \| Bumpty \| Bungee Piranha Plant \| Burt \| Cactus Jack \| Caged Ghost \| Chomp Shark \| Clawdaddy \| Cloud Drop \| Coin Bandit \| ComBat \| Crabble \| Crazee Dayzee \| Crusher Blargg \| Dancing Spear Guy \| Dangling Ghost \| Debull \| Drop Hard \| Eggo-Dil \| Fat Guy \| Flightless Goonie \| Flightless Skeleton Goonie \| Flopsy Fish \| Fly Guy \| Frog Pirate \| Gabon \| Gargantua Blargg \| Ghost Piranha \| Glide Guy \| Gobblin \| Gooey Goon \| Goomba \| Goonie \| Green Glove \| Grim Leecher \| Grinder \| Grunt \| Gusty \| Hanging Blow Hard \| Hot Lips \| Incoming Chomp \| Invisighoul \| Jean de Fillet \| Koopa \| Lakitu \| Lantern Ghost \| Large Milde \| Lava Drop \| Lemon Drop \| Little Mouser \| Little Skull Mouser \| Loch Nestor \| Lunge Fish \| Lure Ghost \| Melon Bug \| Milde \| Mini-Raven \| Mufti Guy \| Needlenose \| Nep-Enut \| Nipper Dandelion \| Nipper Plant \| Parakoopa \| Pirate Guy \| Piro Dangle \| Piscatory Pete \| Podoboo \| Pokey \| Potted Ghost \| Potted Spiked Fun Guy \| Preying Mantas \| Pyro Guy \| Raven \| Rocket Guy \| Seedy Sally \| Short Fuse \| Shy Guy \| Shy Stack \| Skeleton Goonie \| Slime \| Slug \| Slugger \| Spear Guy \| Spike (creature) \| Spike (moving obstacle) \| Spiked Fun Guy \| Spooky \| Spray Fish \| Spring Plant \| Stilt Guy \| Stompin' Chomp \| Stretch \| Tap-Tap \| Thunder Lakitu \| Tube Guy \| Very Goonie \| Wall Lakitu \| Whirly Fly Guy \| Wild Piranha \| Wild Ptooie Piranha \| Windbag \| Woozy Guy \| Zeus Guy (Bandit) \| Zeus Guy (Snifit)