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A Pool Shark (also called Sharkagators or Sewer Sharks depending on the location) were biting, amphibious beings that lived on the outskirts of the end of the level on Umbris that ate Ratchet only if they were in water. These were the only living enemies in the level besides the Blargian Snagglebeast. A few swings of the wrench, or one Hyper-strike, would defeat them with ease. This is the only time as of yet that the Pool Sharks have been attackable.
Non-attackable sharks were found throughout both the Solana Galaxy and the Bogon Galaxy and were the creatures that ate anyone who decided to swim too far from land. They could be found lurking in the water on any level that does not require the player to swim, making the sharks act as a deterrent for players straying too far from anywhere else in the level besides the set path. On most levels, players could assess whether or not the water was safe; If the water was transparent, Ratchet could swim without being harmed. If he fell in murky water, he would get eaten almost instantly and would be reset to the last Checkpoint. As a prewarning, fins could be seen in the water, however Planet Daxx and Florana in Up Your Arsenal lacked them. After falling in the water, Players were given around five seconds before one of the creatures attacked.
- The Sewer Shark bore many similarities with the Lurker Shark from the Jak and Daxter universe, as both enemies were used as a way to keep the player from hitting the levels borders by providing a natural deterrent organic to the environment.
- The sharks seemed to have changed color over time. In the first game, they were all a dark green color (both in the pools on Umbris and in the oceans on Rilgar). Later in Going Commando, the sharks were one of two different colors depending on location. On Notak, the sharks swimming in the ocean were an orange color while the sharks in the factory on the same planet (where Ratchet must use the Thermanator to freeze the sharks in the water) were the original green color. Then, from Up Your Arsenal onwards they were always orange.
- In Size Matters, in the beginning part of Dreamtime the fins could be seen in the water as well as a much larger moving unknown navy blue/purple polygon shape.
- In Size Matters, the sharks had human-like green pupiled eyes, instead of their glowing yellow eyes in the other games. It also moved more differently in Size Matters rather than just moving upward, turning 180 degrees, and plunging downward.
- In Up your Arsenal, the shark didn't open its mouth when it ate Ratchet.
- In the Ratchet & Clank Demo, the Pool sharks also didn't open their mouths either, in fact they used exactly the same animation, but in the official release, they did. This means that the "Chomping" animation was eventually scrapped in later games in favour of a simple "Swallow whole" animation.
- When the sharks attacked, all of the games kept the same "gulping" sound when they ate Ratchet and Clank. This gulping sound was also used in the Pokitaru Infobot from the original Ratchet & Clank.
- They did not appear in the Future series; instead Ratchet just sank into the water and drowned. Because of this it is possible that pool sharks are not native to the Polaris Galaxy.
- In Size Matters, the sharks also appeared in the Multiplayer map called Island Escape. If a player jumps into the water, he'll get eaten by a shark, followed by a message, "No swimming allowed."
- If Ratchet is eaten by a pool shark in Ratchet & Clank: Going Commando; While "in" the shark, if he is attacked by a different enemy, the game will freeze.
Island Escape (Multiplayer Map)
- Ratchet & Clank (first appearance)
- Ratchet & Clank: Going Commando
- Ratchet & Clank: Up Your Arsenal
- Ratchet & Clank: Size Matters