25-07-2022, 14:48
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Acanthicus adonis

Acanthicus adonis occurs naturally in the lower Tocantins River near the city of Cameta, Pará, Brazil, at a slow current. Although exact details are lacking, it is believed that these fish can be found throughout most of the Amazon basin.

Acanthicus adonis is an excellent fish as a display piece for public aquariums. It can be recommended to those aquarists who are willing to build a huge aquarium to give the fish enough living space. If you are not intimidated by this, the fish are very interesting and will attract the attention of even non aquarists with their prehistoric appearance and active behavior.

Acanthicus adonis

Acanthicus adonis can be distinguished from other fish of its genus by the combination of the absence of a fat fin and well-developed coarse keels on the sides of the body. Young specimens have a slender body. Small specimens have spots all over the body, turning into stripes on the tail plumage. These spots with age become relatively small and few in number, they are reduced and remain on the caudal peduncle and sometimes on the front rays of the pectoral fins. Larger individuals have no white spots. In adults, pectoral fins can reach a length of over 15 cm, which gives them an inimitable appearance. Acanthicus adonis differs from all other congeners in the juvenile coloration of white spots, a more pointed snout and reduced growth of teeth on the edge of the snout. In contrast to females, males have more extensive growth of teeth on thoracic rays, cheeks and body. As males mature, they become territorial and aggressive. The most reliable method to determine the sex of the fish is to examine his genital papilla, which in males is more blunt. The maximum size of fish in an aquarium environment reaches 60 cm in length, but in nature fish can be up to 1 meter.

 Young individuals are usually peaceful in nature, but as they mature, they become aggressive and territorial. Because of this, keep Acanthicus adonis one at a time in a species aquarium. Content will require, given the large size of fish, a huge aquarium volume of 4000 liters.

At the bottom of the aquarium placed large snags and rocks. Need to fix the scenery well, so that the fish can not tip them over. As a substrate used coarse-grained river sand. Young can be kept in aquariums with plants, but adults, dig up with the roots of any vegetation. 

Water parameters: temperature 23-30° C, hardness dH 4-15°, pH pH 6,0-7,8. Need a strong filtration and aeration of water and substitution every three days ¼ of the aquarium water with fresh.

Acanthicus adonis

Illumination is low, lasting 10-12 hours a day.

Acanthicus adonis is virtually omnivorous. The fish are fed live, frozen and dry food, including sinking tablets, flakes, pieces of fruit and vegetables, bloodworms, earthworms, clams and shrimp. One interesting thing to note is that fish growth can be limited if they are not overfed.


There is very little information about the successful breeding of Acanthicus adonis in captivity, although it is possible. Apparently, spawning fish have been achieved in huge aquariums or ponds.

Acanthicus adonis

Acanthicus adonis has a lifespan of about 20 years.

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