FISH ARE Vertebrates (animals with backbone) that live in the sea and in freshwater.Like all animals they have to breathe in oxygen .lungs would fill up , with water ,so instead fish have feathery gills at the back of the head that extract oxygen from water as it flows over them.
Fish have streamlined body ,the ideal shape to move through water.Fish also have overlapping scales These forms a smooth surface for water to flow. over.It has a tail fin ,that gives forward thrust t
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o push fish through the water.Other fins are pelvic fins,these used to steer the fish,Pectoral fins, used to control the direction of movement.Dorsal fin-This controls ,how much fish rolls to one side or the other..Another important parts are Operculum - A flap that cover the gills,and opens to let water flow out.Lateral line-sensors here direct sound vibration and water movement.Another important thing in fish are Slimy mucus-This makes fish slippery and protect against parasite.and finally Eyes ,are important for navigation and to find food.Fish have streamlined body ,the ideal shape to move through water.Fish also have overlapping scales These forms a smooth surface for water to flow. over.It has a tail fin ,that gives forward thrust t
FISH FAMILIES- 'FISH' is a general name given to a range of vertebrates with streamlined bodies that live in water.There are three types of fish.
JAWLESS -These are long ,thin and have a sucking mouth to grasp food .This group includes -Lampreys and hagfish.
CARTILAGINOUS-These fish have a skeleton made of flexible cartilage instead of bones.
BONY FISH- This is the largest group of fish .They have a skeleton made of bone and come in all shape and size.
ELECTRIC FISH-Some fish have electricity on their body. and can give an electric shock if touched.Some electric fishes are -Electric EELS -These lives in South American rivers and produced 500 volt electric pulses to stun prey and deter predators.
Electric Catfish - These are found in tropical Africa. and are nocturnal hunter(hunting at night)It uses its electric organs to generate 300 volts. to stun prey.
Electric rays - It can produce 220 volts to stun its prey.
Elephantnose fish - It produce weak electric currents to help navigation.
DANGEROUS FISH SHARK- Sharks often attacks human and devour them ,thinking them its prey.There are countless incidence when shark attack humans and kill them or ate them up.Though all Sharks are not man eater ,but some are defamed for this.These are-
GREAT WHITE SHARK-This scary predator does attack humans,though it does not really like its taste.
HAMMERHEAD SHARK- It has widely spaced eyes .This shark is prone to making unpredictable attacks on humans.
BLUE SHARK-This is the most wide spread of all sharks.The blue shark commonly circles its prey before attacking them.
The whale shark is around 43ft (13m) in length is the biggest fish in the world.
The great white shark migrates a distance of 20,000 km (12,430mile) during its return trip between south Africa and Australia
Sea horses- Sea horses are bony fish,but their body is not covered with scales.The male has a pouch in his body into which female lays up to 600 eggs.He incubates the eggs in his pouch until they hatch.
FISHY FACTS-
- A Gold fish can live up to 40 years.
- The smallest fish in the world is Paedocypris progenetica.Its length is just.3 inch
- The longest living fish is Rougheye rockfish .Its age in years is 140 years.
- The stone fish found in the Indian and the Pacific Oceans, has spiny fins filled with venom that can be fatal to people who step on them .
- SHARKS
- Fish those lives in Coral reefs have bright colors and patterns to break up their outlines making it harder for predators to catch them or for prey to see them coming.
- FISH
- The deep sea Angler fish emit light to attract its prey.It has flexible bones ,allowing the jaws and stomach to expand and create room for prey twice the size of its entire body.
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