Blue-spotted Grouper

Argus Grouper ~ Peacock Rockcod

Family: Serranidae Picture of a Blue-spotted GrouperCephalopholis argusPhoto © Animal-World: Courtesy David Brough
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What are the best kinds of fish that I can put with my blue spotted grouper, I have a 60 gallon tank.  Pete

   The Blue-spotted Grouper, Argus Grouper, or Peacock Rockcod is a beautiful fish with its' distinctive blue-spots! Sometimes they will also have five or six pale bars on the back half of their bodies.

   These are a typical grouper. The Blue-spotted Grouper, Argus Grouper, or Peacock Rockcod is very hardy and very hungry! (All the time).

For more Information on keeping this fish see:
Guide to a Happy, Healthy Marine Aquarium

Geographic Distribution
Cephalopholis argus
Data provided by
  • Kingdom: Animalia
  • Phylum: Chordata
  • Class: Actinopterygii
  • Order: Perciformes
  • Family: Serranidae
  • Genus: Cephalopholis
  • Species: argus
Peacock Hind or Blue-spotted Grouper (Cephalopholis argus)
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Two Peacock Hinds in the wild.

This video helps to demonstrate the enormity of the Peacock Hinds, as you watch a Emperor Angelfish swim by in the background! The Peacock Hind grows to 17" and comes in various colors from greenish tan, to tan, brown and even burgundy. They all have a wide, bright blue margin on all of their fins. They are covered from nose to tailfin in bright blue spots that are edged in black, except the area of the chest in front of the pectoral fins, which is spotless.

Grouper Blue Spot Dot Grouper (Cephalopholis argus)
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Juvenile Peacock Hind in captivity.

This is an excellent example of how tiny juvenile Peacock Hinds, or Blue Spot Groupers can be! This little guy will eventually grow to 17" and will require a tank that is at least 180 gallons, better yet, 250 gallons. Any fish that can fit in it's mouth will be lunch, and a fish or eel that is as long as they are will also be eaten. Add as the last member of an aggressive community reef or fish only tank and provide places for them to hide. Form larger hideouts as they grow.

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Maintenance difficulty:    The Blue-spotted Grouper is easy to keep mainly because it eats everything and always gets its share.

Maintenance:    Feed all kinds of live foods. Also feed it prepared meaty foods: squid, clams, shrimp, chopped fish, lancefish, or silversides.

Habitat: Natural geographic location:    Blue-spotted Grouper are found in the Indo-Pacific.

Foods:    Like most groupers it is a meat eater that preys on small fish.

Social Behaviors:    This fish is a solitary predator that hangs out among the rocks waiting for prey.

Sex: Sexual differences:    Unknown.

Light: Recommended light levels:    No special requirements.

Breeding/Reproduction:    Unknown.

Temperature:    No special requirements.

Length/Diameter of fish:    Blue-spotted Grouper grow to length of 50 cm (19 inches).

Minimum Tank Length/Size:    A minimum 75 gallon aquarium is recommended.

Water Movement: Weak, Moderate, Strong    No special requirements.

Water Region: Top, Middle, Bottom    No special requirements. Provide rockwork large enough for the fish to hide.

Availability:    This fish is readily available.

Author: David Brough. CFS.
Lastest Animal Stories on Blue-spotted Grouper

Pete - 2018-04-09
What are the best kinds of fish that I can put with my blue spotted grouper, I have a 60 gallon tank.

dominick belardo - 2012-01-07
I have had a blue spotted grouper in my fish tank for 29 years it s face has turned white years ago ,how long does this fish live ,this fish must be 35 years old,can anybody give me an answer thanx dom

  • andrew - 2013-08-26
    I have had my blue spotted grouper for about 3 1/2 yrs and it was owned by my friend previously for about 2 years so I'm guessing he is about 6. I have him in a 100g and he is about 8in. How long did yours take to reach full grown size? He seems to grow rather slow.
Trevor - 2013-05-14
I have had my blue spotted grouper for about 3 years now and he is the definitely the hardiest fish i've ever witnessed. My fishes face also turned white! That started as a spot about a year ago and now its across his WHOLE FACE! He is a perfectly healthy fish, hungriest ive ever owned. Your comment actually brought me to this site because I was looking up why that would have happened. Is that normal???

  • Clarice Brough - 2013-05-14
    That is a curious phenomenon that apparently it does happen, and doesn't seem to be a problem for the fish.
glmory - 2008-11-27
I had one of these in a 100 gallon tank for about two years. It is a great fish, but don't keep it with anything small. It will eat any Damsels in the tank within days. It ultimately died when it got put in a tank with a Tesselata eel which is the far larger and more aggressive species. It managed to stay a while with this eel, but was eaten in the end.