Platax pinnatus
Encyclopedia
Platax pinnatus, also known as dusky batfish or red-faced batfish is a fish from the western Pacific that occasionally is kept in marine aquarium
Marine aquarium
A marine aquarium is an aquarium that keeps marine plants and animals in a contained environment. Marine aquaria are further subdivided by hobbyists into fish only , fish only with live rock , and reef aquaria. Fish only tanks often showcase large or aggressive marine fish species and generally...

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Anatomy and morphology

As a juvenile it is brown with orange stripe outlining its entire body. Adults become a dull silver. This fish grows to a maximum size of 45 centimetres (17.7 in).

In captivity

This is almost always a poor choice of fish for an aquarium. They are poor shippers, and typically die within the first few days in the aquarium. Even compared to other batfish
Batfish
Batfish is a name given to several fishes:* The California batfish or sting ray .* Some members of the family Ephippidae.* Some members of the family Ogcocephalidae, including the Pancake batfish.and:...

 they are known for being fragile. Those few that do survive lose their juvenile coloration and exhibit an adult color form typically considered less attractive.

To have some chance of successfully keeping this fish, a quite tall aquarium is desirable. Because this fish is so tall, long aquariums significantly constrain its movement.
Another key factor is to introduce this fish as the dominant fish in the aquarium. Its fins are irresistible targets for nippers like damsels, puffers, butterflies, and angels, let alone triggers.
Once its fins are nipped there is little chance of this shy species to start feeding and typically they starve to death afterwards. Firefish and percula clowns have proven to be great tank mates as they are peaceful and would encourage a newly introduced specimen to start eating.

Fresh water dips upon arrival is a MUST as this species is extremely prone to ick and gill flukes.

In the wild

Platax pinnatus has been observed to significantly reduce algal growths on coral in studies simulating overfishing on the Great Barrier Reef
Environmental threats to the Great Barrier Reef
The Great Barrier Reef is the world's largest coral reef system, composed of roughly 3,000 individual reefs and 900 islands that stretch for 2,600 kilometres and cover an area of approximately 344,400 km². The reef is located in the Coral Sea, off the coast of Queensland in northeast...

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