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Title: Notes. Two Sea Urchins Found inside the Air Bladder of the Bull Kelp (Nereocystis luetkeana) 
Author: Nishimoto, Jiro
Date: 1969-07
Publisher: University of Hawai'i Press
Citation: Nishimoto J. 1969. Notes. Two sea urchins found inside the air bladder of the bull kelp (Nereocystis luetkeana). Pac Sci 23(3): 397-398.
Abstract: 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.
ISSN: 0030-8870

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