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Session
7. Jellyfish in marine ecosystems and their interactions with fish and
fisheries
Co-Convenors: Richard Brodeur (PICES/USA), Cornelia Jaspers (ICES/Denmark), Christopher Lynam (ICES/UK), Song Sun (PICES/China), Shin-Ichi Uye (PICES/Japan) and Won-Duk Yoon (PICES/Korea)
Invited Speakers:
Thomas K. Doyle (University College Cork, Ireland)
William M. Graham (University of Southern Mississippi, USA)
Reiji Masuda (Kyoto University, Japan)
Evidence is accumulating that gelatinous zooplankton populations have increased substantially in many regions
of the world, most likely through anthropogenic stresses, but we have insufficient understanding of how these
blooms affect fish and, more broadly, marine ecosystems. Some benefits of jellyfish to marine fish include
provisioning of food for some species and shelter for juvenile stages of several others. There is also a relatively
minor human benefit in that some jellyfish are both commercially fished and cultured for human consumption in
several countries. However, the negative effects of jellyfish population outbursts are thought to greatly exceed
any positive ones and their effects on ecosystems and the economies that depend on them can be profound.
These effects have been examined through field studies, controlled laboratory experiments, and estimated using
quantitative ecosystem models. Jellyfish are generally detrimental to fish because they feed on zooplankton
and ichthyoplankton, and so are both predators and potential competitors of fish. Relatively little of the energy
consumed by gelatinous zooplankton ends up at higher trophic levels of interest to humans compared to krill
and forage fishes. Jellyfish blooms also directly impact commercial fisheries through filling or clogging trawls
and fouling fixed gear and aquaculture net pens, resulting in enormous economic losses worldwide. This session
will focus on empirical field, laboratory, or modeling studies that examine the effects jellyfish have on marine
ecosystems, fish species and fisheries, and relevant ecosystem-based management issues important to the needs
of society over wide-ranging space and time-scales up to and including climate variations.
Thursday, October 18
William M. Graham, Stefan Gelcich, Carlos M. Duarte, Shin-ichi Uye, Richard Brodeur,
Robert H. Condon and NCEAS Jellyfish Working Group
Jellyfish and fisheries: Risks, trade-offs and adaptations (S7-8601), Invited (pdf, 2.5 Mb)
Thomas K. Doyle, Emily J. Baxter, Graeme C. Hays, Hamish D. Rodger and Neil M.
Ruane
Detrimental impacts of jellyfish on finfish aquaculture: insights from the North East Atlantic
(S7-8603), Invited
(pdf, 2 Mb)
Reiji Masuda, Yuko Miyajima, Ryosuke Ohata and Yoh Yamashita
Jellyfish as a predator and prey of fishes: Underwater observations and rearing experiments
(S7-8630), Invited
(pdf, 1.3 Mb)
Jennifer E. Purcell, Ana Sabatés, Verónica Fuentes, Francesc Pagès, Uxue Tilves,
Alejandro Olariaga and Josep-María Gili
Predation potential of blooming jellyfish, Pelagia noctiluca, on fish larvae in the NW
Mediterranean Sea (S7-8367)
(pdf, 1 Mb)
Cornelia Jaspers
The invasive ctenophore Mnemiopsis leidyi in northern European waters and its potential
impact on fisheries (S7-8597)
(pdf, 1.5 Mb)
Shin-ichi Uye, Alenka Malej and Tjasa Kogovsek
Comparative analysis of the Inland Sea of Japan and the northern Adriatic: Can changes in
anthropogenic pressures disclose jellyfish outbreaks? (S7-8623)
(pdf, 1.2 Mb)
Martin K.S. Lilley, Steven E. Beggs, Thomas K. Doyle, V.J. Hobson, K.H.P. Stromberg
and Graeme C. Hays
Direct and indirect evidence for massive differences in jellyfish biomass between the Pacific
and Atlantic: Implications for fisheries bycatch? (S7-8590)
(pdf, 1.2 Mb)
Lucas Brotz, William W.L. Cheung, Reg Watson, Kristin Kleisner, Evgeny Pakhomov,
Philippe Cury, Roxane Maranger, Brooke Campbell and Daniel Pauly
Anthropogenic impacts related to observed increases of jellyfish populations (S7-8509) (waiting for permission)
Christopher P. Lynam, Martin K.S. Lilley, Thomas Bastian, Thomas K. Doyle, Steven
E. Beggs and Graeme C. Hay
Have jellyfish in the Irish Sea benefited from climate change and overfishing? (S7-8676)
(pdf, 2 Mb)
Alexander V. Zavolokin
Jellyfish of the Far Eastern Seas of Russia: Composition, spatio-temporal variations and
significance for ecosystems (S7-8331)
(pdf, 5 Mb)
Kelly L. Robinson and
William M. Graham
Long‐term change in the abundances of northern Gulf of Mexico scyphomedusae Chrysaora sp. and Aurelia spp. with links to climate variability
(pdf, 2.5 Mb)
Akira Okuno, Tatsuro Watanabe, Satoshi Kitajima, Naoto Honda and Katsumi Takayama
Numerically simulated migration/distribution of Nemopilema nomurai in the Japan Sea using
temperature-based controls (S7-8633)
(pdf, 2 Mb)
Masaya Toyokawa, Akira Yasuda, Yusuke Murata, Kazuhiro Aoki, Manabu Shimizu
and Minoru Hamada Aurelia swarms originate from polyps near the mouth of a bay: evidence from Mikawa Bay
and Ise Bay (S7-8464)
(permission to post denied, contact presenter)
Mary Needler Arai
Predation on gelatinous cnidaria and ctenophores (S7-8402)
(waiting for permission)
Ryosuke Makabe, Ryuji Furukawa, Mariko Takao and Shin-ichi Uye
Marine construction as a factor boosting Aurelia aurita s.l blooms: A case study of a new
floating pier deployment in Hiroshima Bay, Japan
(pdf, 0.5 Mb)
James J. Ruzicka, Elizabeth A. Daly and Richard D. Brodeur
Salmon and jellyfish: Bumping elbows in the Northern California Current (S7-8360)
(pdf, 2 Mb)
John C. Field Jarrod A. Santora Keith Sakuma Amber Payne and Baldo Marinovic
Spatial and temporal patterns of variability in Scyphomedusae in the central California coastal
marine ecosystem (S7-8798)
(pdf, 4 Mb)
Richard D. Brodeur, Mary Beth Decker, Elizabeth A. Daly, Caren Barcelo, James J.
Ruzicka and Kristin Cieciel
A tale of two Chrysaora: Pivotal roles in contrasting marine ecosystems (S7-8430)
(pdf, 2.5 Mb)
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