Skip to content

Hermit crabs climb into discarded tires but can’t get out and die of starvation

Hermit crabs get trapped inside discarded tyres on the seabed and die

It’s been found that discarded tires lying on the seabed are death traps for hermit crabs. They climb into the tyres but can’t get out because the walls are concave. It’s as simple as that. I suppose they climb into them for protection but it becomes a cage which they can’t get out of. Hirosaki University biologists Atsushi Sogabe and Kiichi Takatsuji conducted two tests, one in the sea and a second in a test environment using an aquarium to confirm whether crabs could enter and then be trapped inside a tyre. They placed a tyre and a large tank with a sandy bottom.

Hermit crabs get trapped inside discarded tyres on the seabed and die

Hermit crabs get trapped inside discarded tyres on the seabed and die. Photo: Atsushi Sogabe and Kiichi Takatsuji / Royal Soc. Open Science

They added hermit crabs from the most common species that they had observed in the field. Over six trials each lasting 18 hours they found that hermit crabs could climb into the tyre but couldn’t get out. The outside of a tyre is convex but the inside is concave and it is that simple physical difference between inside and outside which trapped them.

They described the process as ghost fishing. Ghost fishing is when marine wildlife becomes trapped in discarded nets and other Fishing gear. But they say that tyres can be worse because tyres last longer under the sea. They say that tyres have a “temporal persistence”. This is scientific language to mean that they last a long time!

Hermit crabs are important to the ecosystem in that they are both prey and scavengers. The ghost fishing of hermit crabs can have a cascading effect on coastal communities and ecosystems.

The source of this article is Real Clear Science and they refer to the following: Sogabe Atsushi and Takatsuji Kiichi 2021 “Marine-dumped waste tyres cause the ghost fishing of hermit crabs.” R. Soc. open sci. 8210166210166 http://doi.org/10.1098/rsos.210166.

SOME MORE ON MARINE WILDLIFE:

Man hunts mud fish

Video of man catching mud fish will fascinate and horrify equally

For me, this video is frankly disgusting. I hate it and can barely bring myself to watch it. It is ...
Read More
SaxaVord Spaceport what it might look like

Spaceport operator on Unst digs soundproof holes for otters

This is a nice example of improved wildlife conservation in the UK, something which always pleases me. SaxaVord Spaceport, are ...
Read More
Humpback whale ingests massive amounts of plastic inside prey animals

10 million pieces of plastic ingested DAILY by whales

A study concluded that the oceans pose a greater risk to the health of the world's largest creatures than was ...
Read More
Busted fishing cheats

Cheating at fishing is off the scale

I have a strong feeling that cheating in fishing competitions is off the scale because there are some quite nice ...
Read More