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Session
3. Population dynamics, trophic interactions and management of
cephalopods in the North Pacific ecosystems
Co-Convenors: John Field (U.S.A.), Yasunori Sakurai (Japan) and Mikhail Zuev (Russia)
Invited Speakers:
Mary Hunsicker (Oregon State University, U.S.A.)
Chingis Nigmatullin (AtlantNIRO, Russia)
Mitsuo Sakai (National Research Institute of Far Seas Fisheries, Japan)
In most coastal and oceanic ecosystems, cephalopods are or can be an influential driver of food web dynamics
due to their rapid growth, high population turnover rates. They also represent a major, and apparently growing,
fraction of total catches, both in the Northern Pacific and throughout the world’s oceans. In contrast to the generally
slower population response rates of most finfish, cephalopod populations tend to exhibit boom-bust cycles,
challenging traditional management strategies. As events along the West Coast of the United States and Canada
have shown, they may also represent highly visible indicators of ecosystem change, and both the causes and the
consequences of the jumbo squid range expansion on the California Current ecosystem are questions of growing
interest as a result. This session will focus on the ecology and management of cephalopods in North Pacific
ecosystems, specifically on the known or suspected drivers of population dynamics, and applied or potential
management strategies that are (or may be) robust to such dynamics. Papers on the role of cephalopods within
marine ecosystems, particularly with respect to trophic interactions and the strategic management of marine
ecosystems (e.g., the role of cephalopods as forage versus fisheries targets, or as competitors for species targeted
by commercial fisheries), are highly encouraged.
Friday, October 21
Chingiz M. Nigmatullin
Structural and functional aspects of nektonic squid food and parasite relations in the World
Ocean ecosystems (Invited)
(pdf, 0.6 Mb)
Mitsuo Sakai, Yoshiobu Hiraoka, Taro Ichii, Hitoshi Imaizumi, Shintaro Imamura,
Denzo Inagake, Toshie Wakabayashi, Yoshiki Kato, Katsuhiko Miki, Hideki Nikaido,
Yosuke Ochi, Yuji Omura, Hiroaki Saito, Go Takayama, Takakashi Yanagimoto,
Takanori Kobayashi, Nobuhide Hamaji and Ken-Ichi Ishida
Utilization structure of jumbo flying squid stock in fluctuating environments: Possible impact
on other squid harvests in the North Pacific (Invited)
Mary E. Hunsicker, Timothy E. Essington, Reg Watson and Ussif R. Sumaila
The value of cephalopods to global marine fisheries (Invited) (pdf, 0.8 Mb)
Hideaki Kidokoro, Norio Yamashita, Sangwoo Kim, Youngmin Choi and Yasunori
Sakurai
Ecological traits and population dynamics of Japanese common squid Todarodes pacificus that concerned with the fishing grounds and fishing seasons of Japanese and Korean fisheries
(pdf, 3.4 Mb)
Polina Dulenina and Alexander Dulenin
Some data on biology and fishing of Pacific squid (Todarodes Pacificus) in northwestern part
of the Tartar Strait and their relations with hydrological processes
Hyejin Song, Michio J. Kishi and Yasunori Sakurai
Prediction of trade-off between growth and maturation depending on the environmental
conditions in common squid Todarodes pacificus
(pdf, 1 Mb)
Mikhail A. Zuev, Nikolai S. Vanin, Oleg N. Katugin and Gennady A. Shevtsov
Long-term fluctuations in gonatid squid (Gonatidae) abundance in the Okhotsk Sea
(pdf, 1.6 Mb)
Hiromichi Igarashi, Toshiyuki Awaji, Masafumi Kamachi, Yoichi Ishikawa, Norihisa
Usui, Yosuke Fujii, Takahiro Toyoda, Shuhei Masuda, Toshimasa Doi, Shiro Nishikawa,
Yoshihisa Hiyoshi, Mitsuo Sakai, Yoshiki Kato, Sei-Ichi Saitoh and Shin-ichi Sato
A statistical approach to identify optimal habitat suitability of neon flying squid in northwestern
North Pacific by using satellite datasets and 3-D ocean data assimilation product
(pdf, 0.5 Mb)
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