Get to Know
Our Crayfish
Male
The male Australian Red Claw Crayfish (Cherax quadricarinatus) is the undisputed "showman" of the freshwater world. Known for its striking colors and impressive stature, the male is easily the most recognizable figure in any tank or colony.
Key Characteristics of the Male Red Claw
1. The Signature "Red Claw"
The most iconic feature of the male is the soft, fleshy red patch located on the outer margin of its primary claws (chelae).
Purpose: This patch is not just for show; it is a secondary sexual characteristic that signals maturity and vitality.
Texture: Unlike the rest of the hard exoskeleton, this red area is surprisingly soft to the touch. It usually appears as the crayfish reaches sexual maturity.
2. Physical Stature and Dimorphism
Males are built for competition and dominance. Compared to females, they exhibit several distinct physical traits:
Massive Claws: Males possess much larger and more robust claws, which they use for wrestling rivals and attracting mates.
Tapered Body: While females have wide tails for carrying eggs, males have a more V-shaped, streamlined abdomen and a broader "chest" (cephalothorax) to support their heavy claws.
Anatomy: To identify a male, look at the base of the fifth pair of walking legs (the pair closest to the tail). You will find the male genital papillae located there.
3. Bold Temperament and Behavior
If the female is the anchor of the colony, the male is the territorial guardian.
Dominance Displays: Males are highly active and spend much of their time patrolling their territory. They often engage in "claw-waving" displays to warn off intruders.
Architectural Ambition: In a tank setting, males are often more aggressive "interior designers," digging deeper burrows and moving larger rocks to establish a clear kingdom.
4. Growth and Molting
Males generally grow faster and reach larger maximum sizes than females. Under optimal conditions (like the 25°C - 28°C temperatures we maintain in Hong Kong), a dominant male can grow to a substantial weight, sometimes exceeding 500 grams in the wild, looking every bit like a miniature lobster.
5. Coloration
While both sexes share the stunning aquamarine, deep blue, and emerald green body tones, the male’s colors often appear more vivid, especially following a fresh molt. The contrast between his deep blue shell and the bright crimson patches on his claws makes him one of the most aesthetically pleasing invertebrates in the hobby.
Keeper's Tip: When keeping males in Hong Kong apartments, remember that their "ego" is as big as their claws! If you have multiple males, providing visual barriers is crucial, as a dominant male will not hesitate to challenge others to defend his favorite PVC pipe or corner of the tank
Female
The female Australian Red Claw Crayfish (Cherax quadricarinatus) is a fascinating creature, often distinguished by her subtle elegance and her vital role in the colony's life cycle. While her male counterpart is known for his flamboyant red patches, the female possesses unique traits that make her equally interesting to observe.
Key Characteristics of the Female Red Claw
1. Physical Appearance and Coloring
Unlike the males, female Red Claws lack the distinctive soft red patch on the outer edge of their primary claws (chelae). Instead, their claws are usually uniform in color—typically a beautiful mosaic of deep teal, forest green, or midnight blue. Their bodies often feature pale spots or "marmorated" patterns that help them blend into the shadows of the riverbed or tank.
2. Sexual Dimorphism (Identification)
The most accurate way to identify a female is by looking at her underside. Females have their gonopores (genital openings) located at the base of the third pair of walking legs.
Body Shape: Mature females often have a wider abdomen (tail) compared to males. This structural adaptation is necessary to provide ample space for carrying and protecting eggs.
3. Reproductive Behavior and "Berried" Stage
The female Red Claw is a prolific breeder and a dedicated protector. Once she mates, she carries the eggs under her tail, attached to her pleopods (swimmerets).
The "Berried" Look: A female carrying eggs is referred to as being "berried" because the clusters of eggs resemble small berries.
Maternal Care: She will constantly "flick" her swimmerets to circulate oxygenated water over the eggs and keep them clean of debris. Even after the young hatch, they will remain clung to the mother's underside for several days before venturing out on their own.
4. Temperament and Growth
Stability: Generally, females are considered less aggressive than males because they do not have to compete for dominance as fiercely. However, they can become extremely territorial and protective when they are carrying eggs or young.
Size: While they still grow to an impressive size (often reaching 15-20 cm), they are typically slightly smaller and have more slender claws than the males.
5. Role in the Ecosystem
In a community tank or a natural habitat, the female is the anchor of the population. Because a single female can produce anywhere from 200 to over 1,000 eggs per brood (depending on her size and age), she is the driving force behind the growth of the colony.
Fun Fact: If you are raising them in Hong Kong, you might notice the female becomes more active in the spring and summer. During this time, ensuring she has a high-protein and high-calcium diet is essential for her to produce healthy, strong-shelled offspring!
