Date: October 16-17, 2002
Venue: National Research Institute of Fisheries Science, Yokohama

Organizers Hisashi Kurokura (The University of Tokyo) Keynote Address
Ken Furuya (The University of Tokyo) Keynote Address
Tetsuo Seki (NRIA) Representative Coordinator
Junya Higano (NRIA) Assistant Coordinator
Charles Yarish (University of Connecticut) Representative Coordinator of the US

Keynote of the symposium
  Macroalgae, microalgae and filter feeders play important roles in the nutrient cycle of coastal waters as well as in the water quality maintenance. Filter feeders, such as bivalves, have been recognized as most important fauna for seawater purification by means of their huge filtering potentials. Since cultured bivalves do not require supplemental food input into their living eco-system, their functional characteristics in the food web provide an important prospect to ensure most efficient protein production from the ocean. However, in Japan, the productions of commercially important bivalves have been suffered seriously. Production of Manila clam (Ruditapes philippinarum) has been decreasing very rapidly during last decade. Oysters have been seasonally poisoned by dinoflagellates. Pen shells (Atrina pectinata) population has 'been depleted due to a catastrophic mortality. Causative factors are urgently requested to study and resolve these problems for their renovation.
 Besides a high potential of nutrient absorption retained by macro- and micro-algae, their high growth rates turn out the important aquaculture products such as Porphyla, Laminaria and Undaria. These industries, however, have been faced with various difficulties at each production areas due to eutrophication and/or deteriorated environment.
 Under the situation, needs for rehabilitation of algae and bivalve population securing their eco-system in the coastal environment arose nation-widely. In this symposium, we hope to offer a prospective guidance for the solution of these problems based on the contemporary analysis of the cause, comparison of both deteriorated and functioning eco-sites, and grasp necessary research targets. It would be highly fruitful to discuss a logical strategy for sustainable development of aquaculture and stock enhancement between two countries that both have representative aquaculture technology with different background.
Symposium Agenda


Wednsday, October 16, 2002


Opening address

13:00 Toshihiko Matsusato (National Research Institute of Aquaculture)


Keynote address

13:10  Hisashi Kurokura (the University of Tokyo)
      Sea weeds and shells: Their importance in coastal fisheries and environment in Japan

13:35    Charles Yarish (University of Connecticut)

     14:00 Yasushi Hirata and Satoru Akashige (Hiroshima Prefectural Fisheries Experimental Station)

The present situation and problems of oyster culture in Hiroshima Bay

14:25    Mituharu Toba (Chiba Prefectural Fisheries Research Center)

       Recent decline of manila clam stock in Tokyo Bay.

14:50    Ryo Sasaki (Kesennuma Miyagi Prefectural Fisheries Experimental Station)

Environmental conditions relevant to aggregative distribution of benthic animals at Coho salmon culture area


15:15 - 15:45 -------- Coffee break --------


15:45     Junya Higano (National Research Institute of Aquaculture)

Influence of environmental changes in tidal flats on the filtration and respiration of bivalve mollusks


SESSION 2 - Aquaculture as a nutrient recycling technology (Chairs: R. Mann and J. Higano)


16:10       Roger I. E. Newell (University of Maryland)

Understanding the influence of bivalve suspension-feeder populations on water quality in eutrophic coastal waters

16:35      Takashi Kamiyama (Tohoku National Fisheries Research Institute)

The microbial loop in a eutrophic bay and its contribution to bivalve aquaculture

17:00      Richard Langan (University of New Hampshire)

Balancing marine aquaculture inputs and extraction: Combined culture of finfish and bivalve molluscs in the open ocean

Thursday, October 17, 2002


9:00       Daisuke Muraoka (Tohoku National Fisheries Research Institute)

Seaweed resources as a source of carbon fixation.

       Environmental carrying capacity in an aquaculture ground of seaweed and shellfish


SESSION 3 - Necessary breakthroughs for further development in aquaculture


(1) Technological and biological support for sustainable aquaculture (Chairs: R.I.E. Newell and T. Suzuki)


9:50      Thomas Chen (University of Connecticut)

Development of a novel gene transfer method in Porphyra


10:15 - 10:45 -------- Coffee break --------


10:45     Erin Ryder (University of Arizona)

Growth of Gracilaria parvispora in a two-phase polyculture system

11:10     George P. Kraemer (State University of New York)

Bioremediation and mariculture potential of Northeast U.S. and Asian species of Porphyra

11:35     Masanori Okauchi (National Research Institute of Aquaculture)

A new role of the microalga Nannochloropsis oculata for the larval rearing of marine finfish


12:00 - 13:20 -------- Lunch --------


13:20     J. Robert Waaland (University of Washington)

Integrating intensive aquaculture of the red seaweed Chondracanthus exasperatus


(2) Improvement of bio-remediation technology (Chairs: T. Chen and T. Kamiyama)


13:45     Yasuji Tamaki (National Research Institute of Fisheries Science)

Economic value of tidelandvalue evaluation of the clam digging

14:10    Teruaki Suzuki (Aichi Prefectural Fisheries Experimental Station)

Large-scale restoration of tidal flats and shallows to suppress the development of oxygen deficient water masses in Mikawa Bay

14:35     Mark W. Luckenbach (Virginia Institute of Marine Science)

Linking watershed loading models to basin-level carrying capacity models to evaluate the effects of land use on primary production and shellfish aquaculture

15:00    Roger Mann (Virginia Institute of Marine Science)

Environmental change in the coastal environment: Challenges for the selection and propagation of filter feeding species in aquaculture, stock enhancement and environmental rehabilitation

15:25 - 16:00 -------- Coffee break --------



16:00 - 17:20         Discussion

Chairman: Masao Ohno (Kochi University)


Conclusions on the past achievement

Research proposal for next decades


Closing address

17:20      James P. McVey (National Sea Grant Office)


SESSION 1 - Present status of micro and macro-algae and filter feeder aquaculture(Chairs: R. Langan and M. Okauchi)
9:25      Ken Furuya (the University of Tokyo)