Pelagic Fish Stocks on the Move and in the News: Collapse, Recovery, or Something Else?, Part 1*

Monday, August 18, 2014: 1:30 PM-5:20 PM
304A (Centre des congrès de Québec // Québec City Convention Centre)
Small schooling forage fish – such as sardine, anchovy, mackerel, herring, and capelin – are often a crucial trophic link between zooplankton and seabirds, marine mammals, and other fish. Many of these stocks support commercial fisheries. Extreme fluctuations in abundance and distribution are well-documented. Examples include Barents Sea capelin (Mallotus villosus) stock, which collapsed and recovered three times since 1985, and Norwegian spring-spawning herring (Clupea harengus), which collapsed to <1% of its former abundance, recovered over three decades, and whose distribution range retracted and expanded by thousands of kilometers. On the other hand, the northern Benguela sardine (Sardinops sagax) stock collapsed in late 1970s and remains <10% of peak abundance. Why do some stocks recover quickly, but others do not? How does demographic and spatial structure influence population resilience and recovery potential? How does fishing interact with population and spatial dynamics to hinder recovery, and under what productivity conditions? Do shifts in feeding migrations and behavior signal shifts in the trophic dynamics and growth potential of marine ecosystems?

Population dynamics and distributions of forage fish has been the focus of considerable research, correlating changes in environmental factors and fishing pressure with abundance and distribution. Despite this effort, many functional mechanisms remain a mystery. Regional comparisons of stock dynamics, distribution, and behavior may help identify signals of collapse and recovery. Further, the transboundary nature of many forage fish stocks demands international collaboration in research and management of these valuable and ecologically important stocks. The goal of the symposium is to facilitate sharing of knowledge between researchers and managers working with forage fish stocks and their fisheries worldwide. By using comparative approach to forage fish research we will learn more than by focusing on one ecosystem in isolation.

Chairs:
Anna Olafsdottir and Erin Carruthers
Organizers:
Anna Olafsdottir and Erin Carruthers
Chairs:
Anna Olafsdottir
Email: annao@hav.fo

Erin Carruthers
Email: Erin.Carruthers@mi.mun.ca

Organizers:
Anna Olafsdottir
Email: annao@hav.fo

Erin Carruthers
Email: Erin.Carruthers@mi.mun.ca

1:30 PM
Addressing the Challenges of Harvesting Forage Fish; Lessons Learned in Two Australian Fisheries
Tim Ward, South Australian Research and Development Institute

2:10 PM
Developing Tools for an Ecosystem Approach to Fisheries in the Southern Benguela Marine Social-Ecological System: An Overview
Astrid Jarre, University of Cape Town; Lynne J. Shannon, University of Cape Town; Laura K. Blamey, University of Cape Town; Gregory L. Duggan, University of Cape Town; James A.E. Howard, University of Cape Town; Emily S. McGregor, University of Cape Town; Kate E. Watermeyer, University of Cape Town; Hilkka O.N. Ndjaula, University of Cape Town; Sven M. Ragaller, University of Cape Town; Florian G. Weller, University of Cape Town

 
M-304A-3
Harvest Control Rules for Highly Variable, Environmentally-Driven Species: The Case of the Pacific Sardine (Withdrawn)
2:50 PM
Quantitative Evaluation of Day Closures in the Japanese Pacific Chub Mackerel Purse Seine Fishery Using Generalized State-Space Model
Momoko Ichinokawa, National Research Institute of Fisheries Science; Hiroshi Okamura, National Research Institute of Fisheries Science; Chikako Watanabe, National Research Institute of Fisheries Science; Atsushi Kawabata, National Research Institute of Fisheries Science; Yoshioki Oozeki, National Research Institute of Fisheries Science

3:10 PM
Monday Afternoon Break


4:00 PM
Forage Abundance, Quality, and Distribution Drive Food Limitation in an Expanding California Sea Lion Population
Sam McClatchie, Southwest Fisheries Science Center/ NOAA Fisheries; Mark Lowry, NOAA Fisheries Service; John Field, NOAA-National Marine Fisheries Service; Andrew Thompson, Southwest Fisheries Science Center/ NOAA Fisheries; Ed Weber, Southwest Fisheries Science Center/ NOAA Fisheries; William Watson, Southwest Fisheries Science Center/ NOAA Fisheries; Paul Fiedler, NOAA-Fisheries; Karen Nieto, European Commission Joint Research Center; Russel Vetter, NOAA-Fisheries; Daniel Rudnick, University of California

4:20 PM
A Frame-Based Modelling Approach to Understanding Changes in the Distribution and Abundance of Sardine and Anchovy in the Southern Benguela
Kate E. Watermeyer, University of Cape Town; Astrid Jarre, University of Cape Town; Lynne J. Shannon, University of Cape Town

4:40 PM
Do Environmental Factors Guide Selection of Overwintering Locations in Atlantic Herring When Learning Opportunities Are Few?
Jed Macdonald, University of Iceland; Kai Logemann, University of Iceland; Niall McGinty, University of Iceland; William Butler, University of Iceland; Þorsteinn Sigurgursson, Marine Research Institute, Iceland; Guðrún Marteinsdottir, University of Iceland

5:00 PM
Understanding Spawning Behavior and Habitat Use By Anadromous Rainbow Smelt (Osmerus mordax) Using Passive Integrated Transponder Systems and Telemetry
Claire L. Enterline, Maine Department of Marine Resources; Scott Elzey, Massachusetts Division of Marine Fisheries; Bradford C. Chase, Massachusetts Division of Marine Fisheries; Jessica Carloni, New Hampshire Fish and Game; Matthew H. Ayer, Massachusetts Division of Marine Fisheries; David Berlinksy, University of New Hampshire

See more of: Symposium Proposals