Sharkigator

Pool sharks (also called Sharkagators or Sewer Sharks) were biting sharks 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 would defeat them, meaning that they wouldn't have time to attack. The sharks were found throughout both the Solana Galaxy and the Bogon Galaxy and were the creatures that ate people who decided to swim too far from land. They could be found lurking in the water by the player assessing whether it was safe (clear) or dangerous (in murky water one would be able to see the shark's dorsal fin sticking out). If the water was transparent, Ratchet could swim without being harmed. If he fell in murky water, you would get eaten. Multiple fins could be seen sticking out in the water (anywhere from two to four fins, though they were spread out), which meant that there was more than one shark. The fins could be seen in all games except for Up Your Arsenal, in which places like Florana and Daxx there were no fins to be seen. These sharks also lived in the water in Blackwater City on Rilgar. After falling in the water, there were about five seconds before one of the creatures attacked.

Trivia

 * 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.
 * When the sharks attacked, all of the games kept the same "gulping" sound when they ate Ratchet and Clank.
 * They did not appear in the Future series; instead Ratchet just sank into the water and drowned.
 * In Size Matters, the sharks also appeeared 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.".

Appearances

 * Ratchet & Clank
 * Ratchet & Clank: Going Commando
 * Ratchet & Clank: Up Your Arsenal
 * Ratchet & Clank: Size Matters