1. Annual reproductive cycle of the sea urchin, Hemicentrotus pulcherrimus in southern Hokkaido;Agatsuma;Suisanzoshoku (Jpn. J. Aquacult.),1992
2. Limited recovery of the kelp Eisenia bicyclis after population reduction of the sea urchin Hemicentrotus pulcherrimus and Anthocidaris crassispina on Kii Peninsula, southwestern Japan;Agatsuma;J. Shellfish Res.,2009
3. Northward extension of geographic range of the sea urchin Hemicentrotus pulcherrimius in Hokkaido, Japan;Agatsuma;J. Shellfish Res.,2007
4. Growth and gonad production of the sea urchin Hemicentrotus pulcherrimus in the fucoid bed and algal turf in northern Japan;Agatsuma;Mar. Ecol. (Berlin, Ger.),2005
5. Age determination, reproduction and growth of the sea urchin Hemicentrotus pulcherrimus in Oshoro Bay, Hokkaido, Japan;Agatsuma;J. Mar. Biol. Assoc. UK,2004