1. FAO (1996–2006) Fishstat Plus. Dataset-total fishery production
2. Okazaki K, Tenjin A, Akimoto Y (1975) Studies on the artificial maturation of the sea urchin Strongylocentrotus nudus. Bull Fukushima Prefect Fish Experim Stn 3:51–55 (in Japanese)
3. Otaki K, Shimozono S, Tenjin A (1984) Studies on the artificial production of the sea urchin Strongylocentrotus nudus (A.Agassiz). I. Practical mass culturing technique of plutei and metamorphic larvae. Bull Fukushima Prefect Fish Experim Stn 1:1–18 (in Japanese)
4. Hokkaido institute of mariculture (1992) Manual for artificial seeds production of the sea urchin Strongylocentrotus intermedius. Hokkaido Institute of Mariculture, Shikabe (in Japanese)
5. Agatsuma Y, Sakai Y, Matsuda T (1995) Manual for transplantation of sea urchin seeds Strongylocentrotus intermedius. Hokkaido Central Fisheries Experimental Station, Otaru (in Japanese)