Abstract
The feeding biology of Branchiostoma senegalense Webb from the North-West African shelf region off Mauritania was investigated. The hindgut contained almost exclusively seston components, ranging in size from less than 1 μm (bacteria size) to 300 μm. Numerous chloroplasts of ingested phytoplankton appeared to be undigested. Dunaliella salina was still alive when leaving the anus after 1 to 2 h. Detritus formed the greater part of the gut contents. The authors conclude that the lancelets feed mainly on detritus and thus are indiscriminate suspension feeders.
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