Black Scorpion Crab - Cherax holthuisi
  • new species
  • very interesting color
  • quite compatible
  • from 80 cm edge length

Black Scorpion Crab - Cherax holthuisi

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Black Scorpion Crab - Cherax holthuisi
The mysterious black scorpion is a distinctly attractive aquarium crayfish that not only keeps well, but also reproduces in the aquarium, although not as quickly as other species. There is no need to fear a population explosion. These peaceful, quite compatible crayfish of the genus Cherax are also not eager for stress among themselves, on the contrary, it happens that males and females sit together in a cave or wander scissors to scissors through the aquarium. With a life expectancy of two to five years, the Black Scorpion is a medium-sized crayfish that is also very suitable for beginners. - Garnelio
Description

The Cherax sp. "Black Scorpion" probably belongs to a new species, it is being scientifically processed at the moment. Its native country is Papua/Indonesia. There you can find the Black Scorpion mainly in running waters and lakes. The Black Scorpion is predominantly black to dark brown and has orange markings on the claw arms and tail fan, sometimes also on the claws and abdomen. It grows between 11 and 15 cm long (measured without claws). Males do not have claw bladders, but the sexes can be distinguished quite easily: the gonopores (sexual openings) of males are located at the origin of the fifth pair of walking legs, while females have these openings at the third pair of legs. There are also hermaphroditic forms, but when mating they behave like males.

These compatible, very attractive crayfish can be kept very well in the aquarium. In well with wood and stones, caves and other hiding places structured tanks from 80 l you can accommodate a pair very well, for several pairs we recommend aquariums from 112 l. The Black Scorpion is hardly swimming and therefore does not need much open water. Structures for climbing and hiding are much more important.

The Cherax sp. "Black Scorpion" hardly eats plants and does not dig heavily, so it can be kept in planted aquariums. Hard-leaved plants like Anubias or Congo fern as well as very fast growing plants like waterweed, nixwort or hornwort are ideal for a Cherax aquarium. Please cover the aquarium absolutely tight, crayfish are escape artists and climb extremely well!

Cherax sp. "Black Scorpion" are omnivores, which besides vegetable food like greens and over-sprouted unsprayed vegetables and brown autumn leaves (which should not be missing in any aquarium with invertebrates) also gladly accept food with animal components. Granulated food, pellets and flake food are also gladly eaten along with frozen food. The absolute hit is of course special food for crayfish.

The Black Scorpion is a rather peaceful crayfish, which is mainly active at night, especially during the acclimation period. Once the Black Scorpion is familiar with its environment, it is also active during the day in the aquarium. It can be socialized very well with medium sized fish of the middle and upper water regions. Weak, but also careless, very curious fish can be caught and eaten under certain circumstances. However, the Black Scorpion does not actively hunt. Please avoid allowing this cherax to come into contact with water containing North American crayfish, or with the crayfish themselves. Crayfish from America are potential carriers of crayfish plague, a disease caused by a parasite that kills the Black Scorption without exception. The Black Scorpion is also incompatible with other crayfish, with crabs, fan shrimp, and with longarm shrimp, but dwarf shrimp are good company - water requirements must be compatible, of course. Snails and mussels are eaten.

As far as water values are concerned, the Cherax sp. "Black Scorpion" is not very demanding. However, oxygen-rich, not too cool water is mandatory. The pH-value should be between 6,5 and 7,5. Soft to medium hard water (total hardness/GH up to 20, carbonate hardness/KH up to 10) is optimal. Water temperature should not be cooler than 22 °C and should not exceed 25 to 26 °C.

In good conditions male and female mate every few months, after which the female presses out 40 to 80 eggs and attaches them to her swimming legs under her abdomen, which she first curls up. After about 7 to 9 weeks, the young crabs hatch and remain under the abdomen of the mother for a few days, after which they go in search of food on their own. The small crabs need a large number of hiding places, because they are quite cannibalistic among themselves. The young animals of the Black Scorpion grow quite slowly.

Our food recommendation: Freshwater crayfish have a very varied diet in the wild. The Natureholic Crab Feed Sticks contain in a biologically balanced form only those ingredients that these crayfish in this or similar form to their natural food spectrum. This naturally supports and promotes moulting, growth and reproduction. Due to their protein content they are ideally suited for omnivorous crayfish of the genera Procambarus, Cambarus, Cambarellus, Astacus and the Cherax crayfish from Australia, which are basically omnivores that like to eat animal as well as vegetable food. The crayfish of the genus Cherax from Papua also like to eat a portion of animal food when they are young, but later they switch mainly to plant food.

Our plant recommendation: Use for planting NatureHolic InVitros. These are free of snails, planaria and other unwanted co-inhabitants. Also free of algae spores, bacteria and fungi.

Expert Tip: We recommend for fish keeping the NatureHolic 3 Phase Liquid. The care set offers the best all-round protection for your animals. It ensures optimal conditions for successful breeding and keeping.

 

Profile
Scientific name: Cherax sp. "Black Scorpion"
German Name: Black Scorpion Crab
Difficulty level: suitable for beginners
Origin/Distribution: Papua/Indonesia
Coloration: dark brown to black, with orange markings on claw arms and the tail fan, sometimes on the abdomen and claws
Age expectancy: 2 to 5 years
Water parameters: GH to 20, KH to 10, pH 6.5 to 7.5, temperature 22 to 26 °C
Tank size: from 80 l for a pair, however, we recommend a size of at least 112 l for successful breeding
Food: Natureholic crayfish food, brown autumn leaves, nettles, flake food, granulated food or food tabs, vegetables, frozen food
Reproduction: relatively easy, after seven to nine weeks 40 to 80 young crayfish hatch, needing lots of hiding places
Behavior: very peaceful
Socialization: with shrimps, possibly with peaceful small to medium sized fish
Further information Sex differences crayfish, shrimp, crayfish, snails & mussels feed properly, Cherax aquarium crayfish - keeping in the aquarium
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Black Scorpion Crab - Cherax holthuisi

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Black Scorpion Crab - Cherax holthuisi

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Question: "Hallo Garnelio Team! Ich wollte fragen mit welchen Fischarten man den black scorpion Krebs gut vergeselschaften könnte? Viele Grüße"

from Kevin (Garnelio)
Reply
from Kevin (Garnelio)

Mit flinken wie bsp. dem Zebrabärbling.

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Question: "Hallo, Kann dieser Krebs in einem „klassischen“ 240L aquarium mit neocaridina, amanos, Feuertetras und Perhuhnbärblingen gehalten werden? Mit was für „Konsequenzen“ für meine Pflanzen muss ich rechnen? Danke!"

from Kevin (Garnelio)
Reply
from Kevin (Garnelio)

Das solle idR funkionieren Mit mittelgroßen Fischen der mittleren und oberen Wasserregionen kann man ihn sehr gut vergesellschaften. Schwache, aber auch unvorsichtige, sehr neugierige Fische können unter Umständen gefangen und gefressen werden. Der Black Scorpion jagt jedoch nicht aktiv.

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Question: "Hallo Garnelio Team, kann man ein Black scorpion Krebs Paar mit Garnelen und einer Gruppe Guppy männchen "dumbo ear" in einem 110 liter Aquarium vergesellschaften?"

from Kevin (Garnelio)
Reply
from Kevin (Garnelio)

Die Guppys solltest du besser nich dazu setzen, da sie auf dem Boden schlafen.

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