Dungeness Crab

Fascinating facts about the Dungeness Crab

• Dungeness crabs can reach remarkable ages, especially in cooler northern waters where individuals have been recorded living as long as thirteen years. Along the more temperate west coast of the United States their lifespan usually does not exceed eight years, with most crabs dying around five years old. These age limits reflect the species' growth pattern and the varying environmental pressures across its range.
• Male Dungeness crabs can attain a carapace width of up to nine inches, about 230 mm, while females grow to a maximum of seven inches, roughly 180 mm. This pronounced sexual dimorphism means that the largest males are considerably larger than the biggest females. Typical adults of both sexes are usually 6-7 in (150-180 mm) wide, so the extreme sizes represent the upper limits of growth for the species.
• Although Dungeness crabs are most abundant on sandy bottoms from the intertidal zone down to about 300 ft (91 m), they are capable of inhabiting much greater depths. Individuals have been documented at depths of 2,624 ft (800 m), far beyond the usual high-density range of 170-300 ft (52-91 m). This depth flexibility shows the species can survive across a wide vertical habitat spectrum when conditions allow.
• After mating, a male's sperm can be kept inside the female's spermatheca for up to two and a half years. This long-term storage lets a crab fertilise eggs long after the encounter, or skip mating entirely.
• When a Dungeness crab sheds its old shell, the new one swells with water, making the animal 15-25% larger than before. The soft exoskeleton then needs up to two months to fully harden, leaving the crab vulnerable.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

At a glance

About the Dungeness Crab

In the dimly lit, mystical realm of the ocean floor, the Dungeness crab moves with deliberate, sideways elegance, its shell a mottled mosaic of browns and tans that blends seamlessly into the surrounding terrain. As it glides across the sandy substrate, its eyes, like shimmering opals, drink in the faint glow of distant sunlight, guiding it through a world of subtle vibrations and whispered currents. With each measured step, this enigmatic crustacean embodies the quiet, unassuming resilience of a species that has thrived in the shadows, its secrets waiting to be unearthed by the patient observer.

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