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swimmer crabs on sea cucumber

These are two tiny swimmer crabs "lissocarcinus laevis", of a size of respectively and approximately 7mm (0.3 in) and 3cm (1.2 in), on a sea cucumber "Holothuria aculeata". They probably are baby & mother... The fifth or last pair of legs is flattened for better swimming and digging sand, thus their name of swimmer crabs !

Widespread in all oceans, sometimes at a rate of several million individuals per hectare, the sea cucumber recycle sediments. They have a huge role in the ecosystem of the seabed.

Despite their nickname, the cucumbers are not plants, but tubular animals that crawl in the ocean depths. They are very popular in the far East where they may be traded at high prices. These are explained by the aphrodisiac properties attributed to sea cucumbers. In China and some eastern countries, they are also consumed as trepang, a sweet in which the pieces are cooked, dried and added to soup.

The value and importance of sea cucumbers is however largely beyond their gastronomic qualities or their supposed effects on libido. The majority of the approximately 1 200 species of holothurians inhabiting the seabed belongs to a group of animals called "deposit feeders", literally eating sediment. By ingesting intensively and selectively surface layer of sediment and depositing their droppings, they alter the physico-chemical environment. Their abusive marketing is therefore a real threat for the ecosystem.

ISO 100, 150mm, f-40, 1/60 s.

image reference
20071128-101
location
Sainte Anne, Seychelles
date
28/11/2007
swimmer crabs on sea cucumber