Well, it is a hard life!

Brighton Beach is not a place to go crabbing, generally there’s no rocks or rock pools, moreover any kind of fishing from the pier has been forbidden for decades. Nevertheless, of course, there’s crabs out there, in the sea, lurking. Here’s the evidence of one that got into trouble, lost a claw. Oh dear! 

Given the size and shape of the claw, ChatGPT tells me, it could have belonged to a Velvet Swimming Crab (Necora puber) or to an Edible Crab (Cancer pagurus). However, the former has blue-tinged claws with pronounced ‘hair’ on the body and claws; and the latter has thick, heavier pincers with black tips. 

No, this claw most likely came from a European Green Crab (Carcinus maenas). Although native to Europe it is one of the world’s most invasive marine species, having spread to North America, Australia, South Africa, and beyond, where it outcompetes native species and devastates shellfish stocks.

European Green Crabs (Wikipedia image here) are ubiquitous across Europe’s rocky shores, estuaries, harbours, and tidal pools, burying themselves in sand or sheltering under rocks at low tide. They eat molluscs, worms, algae, detritus, and sometimes smaller crabs. They’re also aggressive and territorial, especially during mating season. Moulting is common as they grow, so they shed claws and exoskeleton fragments often wash ashore.

Despite the name, European Green Crabs are not always green, rather they come in a range of colours, olive green, brown, even reddish. Claws tend to be mottled with a granular texture and sometimes tinged with blue or green hues. They are uneven in size with the larger ones used for crushing prey, and smaller ones for more dexterous handling. The inner edges are serrated and used for gripping prey.

The photographed claw (on a piece of nearby driftwood) probably came from a crab about the size of a human hand. It was most likely lost in one of four ways: fighting other crabs (they are very territorial creatures ), autotomy (self-amputation), predation (by birds or larger fish), or moulting mishaps (claws getting stuck between rocks). Well, it is a hard life!