The Space Sharks
Lure them to the Black Hole up and right from the Ice Planet. If you shoot them, one or more will follow you, and you can get them trapped at the black hole.
The Robot Piranha
The robot fish are swimming under the ice and attack at regular intervals. Once you have jumped onto the ice floes, cross them two at a time to land on the flat ones, which makes it easier to jump when the fish attack.
(see related questions)
There are no cubes on Astro Knights island. There are ice floes on the Ice Planet, that you jump across to avoid the robot fish.
There are no fish on Astro Knights Island. There are Space Sharks around the Ice Planet at X-73 Y-83. To defeat them, shoot them and lure them to the Black Hole at X-85 Y-47. (see related question)
There is no fish. You have to get the mouse from the madian's room and feed it to Merlin. You lure the mouse with the moldy cheese you get from the dungon.
There are no fish. Just shoot the sharks one at a time until ll three are following you. Lead them to the Black Hole up and to the right (X-85 Y-47). Don't fall in, just fly around it until the sharks fall in.
In Poptropica, the angler fish can be found in the "Astro-Knights Island." Specifically, you need to dive underwater in the ocean area to encounter the angler fish. It is part of a quest related to retrieving a special item. Make sure to explore the underwater environment thoroughly to find it!
There are no fish. The Space Sharks are swimming around the Ice Planet, and the way to get rid of them is to let them chase you. Lead them up and right to the Black Hole at X-85 Y-47. (Don't get sucked in). (for more details see the related question)
To get past the slippery icebergs and the robot piranha, jump across the bergs two at a time after the first one. Every other berg is flat, so you can dodge the fish attacks without falling in.
You can see the robot fish coming and jump over them. However, you should move across the slippery icebergs two at a time, because each second berg is a fairly flat one.
Astro Knights IslandYou cannot get a fish on Astro Knights Island. This was a foolish hoax. To beat the Space Sharks, shoot them until they follow you, then slowly lead them up and to the right to the Black Hole (X-85 Y-47), and avoid getting sucked in with them.Skullduggery Island - Getting the map piece at Dragon CoveThe old man needs to catch a fish, and they will jump if you ring the gong. Stand on the sunken statue and the tail will rise, revealing the Mallet. Push the old man to the right, to the first barrel, then use the mallet on the gong. The fish will jump up. If you push him too far to the right, leave Dragon Cove and return, and the fishing challenge will reset.
Astro Knights IslandYou cannot get a fish on Astro Knights Island. This was a foolish hoax. To beat the Space Sharks, shoot them until they follow you, then slowly lead them up and to the right to the Black Hole (X-85 Y-47), and avoid getting sucked in with them.Skullduggery Island - Getting the map piece at Dragon CoveThe old man needs to catch a fish, and they will jump if you ring the gong. Along the water, stand on the sunken statue and the tail will rise, revealing the Mallet. Push the old man to the right, to the first barrel, then use the mallet on the gong. The fish will jump up. If you push him too far to the right, leave Dragon Cove and return, and the fishing challenge will reset
The robot fish jump up at regular intervals, and you can see them coming. The easiest way to avoid them is to be on a flat piece of ice, so you don't slide off. After you jump to the first ice floe, go to the rest two at a time, because every second piece is flatter.
You can see the robot fish (piranha) swimming below, so you have to jump when they attack. After you jump to the first floating iceberg, jump the rest two at a time, because every second floe is a flat one, which is easier to jump from.