Notes. Two Sea Urchins Found inside the Air Bladder of the Bull Kelp (Nereocystis luetkeana)

Nishimoto, Jiro
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University of Hawai'i Press
While I was a scientific observer for the United States aboard a Japanese fishing vessel in the North Pacific Ocean, I observed two sea urchins living within the cavity of the air bladder of the bull kelp, Nereocystis luetkeana (Mertens). The sea urchins were identified as Allocentrotus fragilis (Jackson) by David Pawson of the Smithsonian Institution (personal communication). The kelp was taken in an otter trawl of the Japanese factory ship stern trawler "Takachiho Maru" on April 23, 1965, off Fox Islands in the Aleutians (53°26'N, 166°01'W). I witnessed the discovery of the urchins when a worker cut into the air bladder after picking the kelp from the landing bin. The kelp was intact, and the urchins were dark red and glistened with moisture. No sea water was in the bladder. I acquired the kelp with the urchins still inside and examined the bulb for openings other than the cut made by the worker. No other openings were visible, although some of the top of the kelp bulb broke after the initial cut was made (Fig. 1). The cavity of the bulb did not extend into the stipe, and the opening made by the worker had to be enlarged to remove the urchins.
Nishimoto J. 1969. Notes. Two sea urchins found inside the air bladder of the bull kelp (Nereocystis luetkeana). Pac Sci 23(3): 397-398.
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