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Eastern blue gropers change from females to males when they reach around 60cm in length. At that time they also change from brown to a brilliant blue.

 

 

 

 
Barramundi, which are farmed in NSW, start life as males and end as females. They also live in both freshwater and saltwater.
 

Some male fish defend the nest site and care for the eggs until they hatch. Many gobies and gudgeons do this.

 

 

 

 
Herring let off gas. Most other fish burp. To get rid of excess air from the bladder herring discharge it through the intestine but other fish discharge it through the mouth.
 

Sharks are fish but they don't have any bones. Instead, they have a more flexible skeleton made of soft cartilage. The only hard part of the shark is their teeth.

 

 
Not all sharks are dangerous. There are about 370 different types of shark, but less than 10 of these are considered dangerous to humans.
 

Yabbies have been around for two million years and can dig a burrow many metres deep.

 

 
River eels swim several thousands kilometres from NSW to the deep ocean north of New Caledonia to spawn. They spawn only once in their life and then die.
 

The translation of the scientific name for Butterfish, Scatophagus, is Scat = poo, phagus = eater.

 

 
The fastest fish in NSW waters is the sailfish, which has been clocked at speeds of more than 110 km per hour. The sailfish is found off northern NSW in the summer months. Other fast fish include mako sharks, marlin, wahoo, mackeral, tuna and the shortbilled spearfish.
 

The Australian bass travels from freshwater rivers to estuaries (saltwater) to spawn.

 

 

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