What an appropriate name! With all its large and small pores the breadcrumb sponge actually looks like dried, crumbly bread. Its colour varies from white through to yellow and greenish tones – the result of little endosymbiotic algae. To absorb food, it sucks in sea water and drives it back out again through its apertures. Fresh from the sea, it smells like ignited gunpowder. This is caused by a substance that protects the sponge from its predators.
Baltic Sea LIFE - DISCOVER.UNDERSTAND.PROTECT.