Hello dear readers! Blanche’s silver knife is an aquarium inhabitant belonging to the Notopter family. There is a silver knife in the Mekong River, Thailand, Cambodia and Laos.
As a rule, the fish is found in large tributaries, where there is a rocky bottom and a rapid flow of the river.
The royal knife has a humped and elongated body, compressed at the sides. The mouth is large and has many small teeth in its arsenal. This aquarium fish can breathe both atmospheric air and oxygen dissolved in aquarium water.
The main color of the fish is silver-gray. On the back of the body there are black oblique lines that smoothly turn into dark and small spots.
At the base of the pectoral fins you can observe a large dark spot. Thanks to its powerful pectoral fins, the Blanche’s knife can swim its tail forward and perform various maneuvers around the aquarium.
But the dorsal fin is very small, it is almost imperceptible. The long anal fin, which originates from the chest and smoothly passes into the caudal fin, which runs along the whole body, is striking. By creating this long fin wave-like movements, the fish and moves in the aquatic environment.
Under natural conditions, a silver knife can grow up to one and a half meters in length, but in conditions of bondage its size does not exceed 60 centimeters. The maximum lifespan of a pet is about 10 years.
In females, the abdomen has a more rounded shape, this is especially noticeable during spawning. Males are somewhat larger than females and much slimmer.
Blanche’s silver knife is active for 24 hours, especially fish is active if there are a couple of representatives of this species in the aquarium at the same time. As a rule, for keeping in home aquariums, only young individuals are bought, because, because of their impressive size, adult fish require a lot of free space for swimming.
A knife is a predatory hydrobiont, which, as a rule, is kept in a species aquarium or individually. It was noticed that Blanche’s knife gets along quite well with other large fish, for example: large guramki, arovanas, tsikhlazomy, astronotus, polypteruses and large soma.
If you keep a group of these fish in your tank, you will need to give them a lot of personal territory. If two or more males of a silver knife live in your aquarium, then a tense situation will constantly hover in the aquas, which will result in frequent skirmishes during which the fish can get seriously damaged. The most dangerous and vulnerable spot is the throat ligament, where those who fight are often tagged.
If the fish is injured in the throat ligament, it will immediately die. Also do not scare the knives in the aquarium, because during a fright they can hit the wall of the aqua.
In addition, large pieces of food are also contraindicated for him, as they can also cause injury to the throat ligaments.
To contain one royal knife, you will need a specific aquarium, the volume of which should exceed 300 liters, where you definitely need to install shelters of zagryag and stones. It is also very important to plant a large number of long-stemmed aquarium plants (Ludwigia, ambulia, rogolodnik, wallisneria, cabomba, hydrotrich) along all the walls of the reservoir. Thus, you will maximize free space to swim your pet.
As a rule, knives prefer to keep in the lower and middle layers of water. Regular water changes (once a week), aeration and filtration are vital for this fish.
The temperature of the water in the aquarium should be in the range of 22-25 degrees, the hardness of 5 10 degrees, and the active reaction of the environment 6.5-7.5 pH. Lighting in aquas with a blanche’s knife should be muffled.
There is a knife live food: worms, crustaceans, shrimp, mussels, snails and small fish. To teach a pet to inanimate food, it will take some time and persistence of an aquarist.
Such feeds include: fish fillet, beef heart, squids and pieces of meat. Do not forget about overeating, so strictly adjust the amount of food.
Mature Indian knife becomes three years. To start breeding knives, you will need a large aquarium, the length of which should be from 120 centimeters, into which floating plants are placed (pistiya, azolla, Riccia, Guadalupe naiad).
At the bottom of the spawning aquarium, you need to place various shelters and flat stones. Water in spawning should meet the following parameters:
- rigidity: no more than 5;
- water temperature: 26-28 degrees;
- active reaction environment: 6.0-6.5 pH.
The period of incubation of eggs, in which the male carefully cares for caviar, can last about a week. During the care of future offspring, the male constantly performs oscillatory movements with his tail fin, creating a constant flow of water to the calf.
As soon as the fry hatch, they are immediately deposited in the reed, where they are fed with nauplii of Artemia.