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Reproduction and growth of thelepus setosus polychaetous annelid in subantarctic province



Reproduction and growth of thelepus setosus polychaetous annelid in subantarctic province



Annales de l'Institut Oceanographique 55(2): 145-154



The biology of T. setosus (Annelida Polychaeta, Terebellidae, Sedentaria), a widely distributed polychaete, was studied in the Gulf of Morbihan (Kerguelen archipelago, subantarctic province). Ten areas were sampled using a Smith-McIntyre grab, by diving and at low tide. The different phases of the reproductive cycle were studied from in situ observations and from animals grown in an aquarium. The sigmoid ovocyte growth curve goes from 100-220 .mu.m. Spawning is well synchronized in the Gulf and occurs within less than 10 days in Oct. This species is polytelic; the animal's life span is 6.5 yr. The body growth curve shows that there is a marked decrease in body growth between July and Sept. During these months the ovocyte growth is faster although the trophic level in the environment shows a marked deficit. Apparently the energy taken up is used by the gonads after its transit through a somatic structure.

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