Crimson-spotted Rainbow Fish help control mosquitoes because they eat mosquito larvae which live in the water.

Common name: Crimson-spotted Rainbow Fish
Scientific name: Melanotaenia duboulayi
Photo: C. Bento, Australian Museum
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Crimson-spotted Rainbow Fish are bony fish. They have three stages in their life cycle: egg - juvenile - adult.

Crimson-spotted Rainbow Fish have silvery, blue-grey sides with a shining yellow colour. They have a red spot behind their eye on their gill cover. Males often have red spotting on their fins.
Crimson-spotted Rainbow Fish live east of the Great Dividing Range between southern Queensland and northern New South Wales . They are often found in streams, rivers, dams and ponds.
Crimson-spotted Rainbow Fish eat insects, tadpoles, plants and worms.
Larger fish, giant water bugs and water spiders, turtles and water rats all like to eat Crimson-spotted Rainbow Fish.
Crimson-spotted Rainbow Fish breathe by using their gills to absorb oxygen from the water. Water enters through the fish's gills and flows past a rich blood supply. The oxygen passes from the water through the thin gill membranes into the fish's blood.
When Crimson-spotted Rainbow Fish breed, each female will lay several eggs a day in the breeding season. Eggs are then fertilised by the male. Sticky threads help the eggs stick to plants in the water. About one week later the eggs hatch.