# FISH AND SHARK

![](https://1830720158-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgYfXodpIgXT5pRSOvcc4%2Fuploads%2FjTkcruIVCnAP4ZuYxsNu%2FFish%20Rate.png?alt=media\&token=f44eec04-5c62-4ba7-90d4-b9cd126b61e4)

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:shark:**Shark Species**

This is algorithmically determined by the block hash and completely beyond the control of game developers since no one can predict the block hash before the block is mined.

:clock1:**Valid Catching Time**

The monsters that appear are only valid within 200 blocks, and if not caught, are gone forever.

:gun:**Minimum Catching Power (CP)**

* The Minimum Catching Power is the amount a player is required to pay in order to catch a **Shark**.
* The Minimum Catching Power scales with genus groups; rare **Shark** will require a higher catching power. 
* The Minimum Catching Power increases periodically based on the total **Shark** population and can be subject to future governance.
* Players pay for Catching Power by in-game currency Energy

:tada:**Available Amount**

There may be more than one **Shark** (of the same species) available to be caught on a catch block. If that available amount drops to 0, any transaction sent to catch the **Shark** in that block will be reverted.

:symbols:**Success Rate**

Not every attempt at catching a Blockchain **Shark** will be successful. The success rate represents the chances of catching a **Shark**. If the player fails to catch the Monster, the dedicated Energy amount would still be deducted. In general, the rarer the Monster, the lower the catching success rate.

:high\_brightness:**Catching Booster**

There is a base catching success rate for each species. Players can further increase the success rate by using more Energy as ‘catching booster’.

**Shark Stats and Perfection Levels**

Each **Shark**’s battle attributes vary and are random at the time it is caught. **Shark**s caught from the same block are always of the same species, but will have different stats and perfection levels.

**Blockchain World Difficulty**

The Minimum Catching Power and success rate will be adjusted over time to ensure a balance between supply and demand.