Essential Organs:
* Gills: These are responsible for taking in oxygen from the water and releasing carbon dioxide.
* Heart: Pumps blood throughout the body.
* Brain: Controls the fish's behavior and senses.
* Stomach: Digests food.
* Intestines: Further digest food and absorb nutrients.
* Kidneys: Filter waste products from the blood and produce urine.
* Liver: Processes nutrients, detoxifies harmful substances, and produces bile.
* Swim Bladder: A gas-filled sac that helps the fish maintain buoyancy.
* Scales: Provide protection and reduce friction while swimming.
Other Organs:
* Eyes: See.
* Mouth: Takes in food.
* Teeth: Used for chewing or grasping prey.
* Fins: Used for swimming, steering, and stability.
* Tail: Provides propulsion for swimming.
Specific to certain fish types:
* Electric Organs: Generate electrical currents for defense or hunting.
* Lateral Line: A sensory system that detects vibrations and pressure changes in the water.
It's important to note that the specific organs and their functions can vary depending on the type of fish.