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Effects of ingested food stuff on the formation of growth lines in test plates of the sea urchin, Strongylocentrotus intermedius, were studied with the aid of tetracycline labelling. From November, 1969, to the following April, sea urchins were reared in three aquaria, each of which contained a different alga, Laminaria japonica var. ochotensis, Rhodaglossum japonicum and Ulva pertusa, respectively. Tetracycline injections were made through the peristirnial membrane in December and March. Those fed Laminaria showed higher value in 1) amount of food ingested, 2) amount of food assimilated and 3) assimilation efficiency and the highest growth rate of the test plate was obtained in this group. The growth was observed as a pigmented zone bordered on both sides by a fluorescent tetracycline band parallel to the longitudinal suture. No such sharp pigmentation pattern was observed in the other groups fed on Rhodoglossum and Ulva. The growth lines were clearly observed between apical and ambitus regions of the test which showed the highest growth rate in the test plates, while they were not clear on the test plates of oral region in the same individuals. The growth rate of the test plate correlated with the amount of food assimilated, and the clarity of the growth lines was affected by the growth rate of the test plate.

Formation of Growth Lines in Test Plates of the Sea Urchin, Strongylocentrotus intermedius, Reared with Different Algae