The walrus is a freshwater fish that lives in tropical South America. This is one of the largest freshwater fish in the world. In the wild, an adult fish can reach a huge size with a length of up to 6m and a weight of up to 2 tons. This is one of the rare fish species and has now been included in the world clean red for protection.
Overview of sea urchin fish
Source
This fish was discovered in 1829 by the Swiss biologist - Louis Agassiz, the Arapaima fish (or walrus, walrus or Piracuru). They live mainly in the rivers of Peru, the Amazon River region of South America.
The scientific name is Arapaima gigas.
English name: Arapaima; Pirarucu.
Breed line: Sea urchin is a fish belonging to the family of sea urchins and the order of stilts.
Biological characteristics of sea urchins
In the artificial environment in aquariums, sea urchins usually reach a size of 250-450 cm.
Habitat: Suitable ambient temperature between 25 and 29 degrees Celsius, water hardness from 8 to 10 (dH) and pH between 6-6.5.
Food: Adult walruses eat animals such as small fish, insects, frogs... In the tank, farmers also add meat such as pork, beef, chicken, etc. their daily menu.
The form of reproduction of sea urchins is to lay eggs.
Sea elephants live in the surface and middle water layers.
Reproduction: Fish spawn when they reach adulthood (usually 5 years or older). The fish usually lays on the sand nest, then the father sprinkles semen on the eggs. The male fish incubates eggs in his mouth from the 1st to the 4th month. When the rainy season starts in May, the water in the ponds and lakes rises, which is when the fry hatch and start life in the flood season. Both the father and the mother are responsible for the care of the offspring.
One of the special features of the sea lionfish is that they have the ability to breathe by catching the air above the water's surface. Besides gills, this fish also "extracts" oxygen from the air thanks to the capillary layer in the throat - which functions like the lungs of land animals.
As a result, Arapaima fish can survive the dry season or the lack of oxygen in the Amazon wetlands by burying themselves in the mud of the swamp and breathing through their mouths. However, this inhalation of air must take place every 5 - 15 minutes.
