A group of jelly fish is called a smack. The blue fin tuna is one of the largest and fastest marine fish. Horseshoe crabs have existed in the same form for 135 million years. The study of a deep sea community in an area half the size of a tennis court revealed 898 species. More half these species were new to science.
Dugongs are the only fully plant eating marine mammal, and the only sea cow to occur in Australia.
520 dolphins were caught in shark nets in Queensland between 1967 and 1988 - one every two weeks. Fifty-five species of fish and invertebrates have been introduced into Australian waters. Australia's waters are home to more than 4000 species of fish including 166 species of shark and more than 110 species of seahorse. The Flatback Turtle is only found in Australia. There are 110 species of seabird belonging to 12 families around Australia.