Portfolio Management of Fish Communities in Large Marine Ecosystems1 1Cf. an article similar to this one was published by Edwards, S.F., J.S. Link, and B.P. Rountree. Portfolio management of wild fish stocks. Ecological Economics 49 (2004):317-329.

2005 ◽  
pp. 181-199 ◽  
Author(s):  
Steven F. Edwards ◽  
Jason S. Link ◽  
Barbara P. Rountree
Keyword(s):  
Portfolio Management ◽  
Ecological Economics ◽  
Fish Communities ◽  
Wild Fish ◽  
Fish Stocks

Portfolio management of wild fish stocks

2004 ◽  
Vol 49 (3) ◽  
pp. 317-329 ◽  
Author(s):  
Steven F Edwards ◽  
Jason S Link ◽  
Barbara P Rountree
Keyword(s):  
Portfolio Management ◽  
Wild Fish ◽  
Fish Stocks

scholarly journals Seasonal patterns and diets of wild fish assemblages associated with Mediterranean coastal fish farms

2008 ◽  
Vol 65 (7) ◽  
pp. 1153-1160 ◽  
Author(s):  
Damian Fernandez-Jover ◽  
Pablo Sanchez-Jerez ◽  
Just Tomás Bayle-Sempere ◽  
Carlos Valle ◽  
Tim Dempster
Keyword(s):  
Fish Assemblages ◽  
Abundant Species ◽  
Stomach Content Analysis ◽  
Wild Fish ◽  
Seasonal Patterns ◽  
Fish Farms ◽  
Coastal Fish ◽  
Fish Stocks ◽  
Floating Structures ◽  
Cage Fish

Abstract Fernandez-Jover, D., Sanchez-Jerez, P., Bayle-Sempere, J. T., Valle, C., and Dempster, T. 2008. Seasonal patterns and diets of wild fish assemblages associated with Mediterranean coastal fish farms. – ICES Journal of Marine Science, 65: 1153–1160. Fish are attracted to floating structures, including coastal cage fish farms, sometimes in dense aggregations. To understand better the influence of aquaculture on wild fish stocks, we carried out seasonal visual censuses around three southwestern Mediterranean farms over 2 years to assess the temporal patterns of the aggregated fish assemblage. In addition, we analysed the diet of the five most abundant species. Aggregations around all farms were large throughout the year, although species composition and abundance differed among farms and seasons. Fish farms are attractive habitats for certain species of wild fish in specific seasons. Adult fish of reproductive size dominated the assemblages, and stomach content analysis revealed that 66–89% of fish of the five most abundant taxa had consumed food pellets lost from the cages. We estimated that wild fish consume up to 10% of the pellets used at farms, indicating that food is a key attractant. Regional monitoring of farm-associated wild fish assemblages could aid management of the interaction of aquaculture and wild fish resources, because changes in feeding behaviour may have consequences for fish populations and local fisheries.

scholarly journals Reared fish, farmed escapees and wild fish stocks—a triangle of pathogen transmission of concern to Mediterranean aquaculture management

2013 ◽  
Vol 3 (2) ◽  
pp. 153-161 ◽  
Author(s):  
P Arechavala-Lopez ◽  
P Sanchez-Jerez ◽  
JT Bayle-Sempere ◽  
I Uglem ◽  
I Mladineo
Keyword(s):  
Pathogen Transmission ◽  
Wild Fish ◽  
Fish Stocks ◽  
Aquaculture Management ◽  
Farmed Escapees

Science for Canada’s Fisheries Rehabilitation Needs

1976 ◽  
Vol 33 (8) ◽  
pp. 1822-1857 ◽  
Author(s):  
K. H. Loftus
Keyword(s):  
Fish Communities ◽  
Early Years ◽  
Current Status ◽  
Productive Capacity ◽  
Data Synthesis ◽  
Fish Stocks ◽  
Rehabilitation Programs ◽  
Sea Ranching ◽  
Definition Of ◽  
Rehabilitation Needs

A brief, generalized review of the current status of salmonid fisheries on the west and east coasts, and of selected representative waters in the freshwater area is presented. It is concluded that many fish communities and/or fish stocks are depressed, collapsed, or extinct as a result of severe stresses imposed directly, or indirectly, by man’s activities. Rehabilitation of fish stocks and fish communities to levels approximating those of early years, and to levels capable of supporting more stable yields to meet growing client requirements appears practical. The need for explicit policy decisions with regard to sea ranching and rehabilitation as options for approaches to increasing fish abundance is stressed. Rehabilitation of stocks and communities will require additional science in areas such as hatching, rearing and selective breeding, fisheries engineering, and in the more precise definition of natural productive capacity of waters. Effective fisheries rehabilitation programs, and fisheries management generally, require: development of fisheries information systems; an adaptive or experimental approach; more social and economic data; synthesis and communication of science available; and fundamental reconsideration of the traditional institutional arrangements for fisheries work. Some important fisheries rehabilitation programs, carefully planned and assessed, can proceed immediately with confidence in their success; others must await improvement in water quality.

scholarly journals Study of fish communities in the Siret river, and some tributaries (Bacau – Racaciuni section, 2012-2016)

2019 ◽  
Author(s):  
Dorel Ureche ◽  
◽  
Camelia Ureche ◽  
Keyword(s):  
Fish Species ◽  
Biological Material ◽  
Research Study ◽  
Fish Communities ◽  
Actual State ◽  
Ecological Indices ◽  
Perccottus Glenii ◽  
Ecological Analysis ◽  
Fish Stocks ◽  
Taxonomic Analysis

The study was carried out in Bacau - Racaciuni section of Siret River, on the main course of the river and on some of its tributaries during the period 2012-2016. The aim of our research study was to assess the actual state of fish communities in the study area, and also to highlight significant changes in fish communities, based on the ecological analysis. The biological material was sampled by electrofishing from 16 sampling sites, and then it was determined and immediately released. The taxonomic analysis highlights the presence of 27 fish species, two of them being non-native: Psedorasbora parva, and Perccottus glenii. Some of the ecological indices were calculated, as well as biodiversity indices (Margalef, Menhinik, Shannon-Wiener), evenness (equitability), and fish stocks. The ecological analysis revealed some interesting aspects of fish communities’ structure and also of biodiversity.

Nothing as Practical as a Good Theory

2019 ◽  
pp. 1-12
Author(s):  
Ken H. Andersen
Keyword(s):  
Fisheries Management ◽  
Fish Communities ◽  
Reference Points ◽  
Fish Ecology ◽  
Good Theory ◽  
Fish Stocks ◽  
Fisheries Science ◽  
Ecosystem Based Fisheries Management ◽  
Stock Recovery

This chapter provides some context on the overall themes and theory of this volume. Throughout, the theory is applied to relevant problems in fisheries science: impact of fishing on demography, fisheries reference points, evolutionary impact assessments, stock recovery, ecosystem-based fisheries management, and so on, as well as to basic ecological and evolutionary questions. The chapter begins by addressing the motivations for a new theory of fish stocks and fish communities. It also considers what problems such a theory should address and how such a theory can be formulated. From here, the chapter discusses what makes a good theory and the peculiar challenges fish ecology represents.

The Precautionary Approach and risk management: can they increase the probability of successes in fishery management?

2001 ◽  
Vol 58 (1) ◽  
pp. 99-107 ◽  
Author(s):  
Ray Hilborn ◽  
Jean-Jacques Maguire ◽  
Ana M Parma ◽  
Andrew A Rosenberg
Keyword(s):  
Risk Management ◽  
Portfolio Management ◽  
Fishery Management ◽  
Fishing Communities ◽  
Individual Species ◽  
Precautionary Approach ◽  
Fish Stocks ◽  
Management Policies ◽  
Management Approaches ◽  
Made In

Considerable progress has been made in the implementation of the Precautionary Approach to the protection of fish stocks, but applying the Precautionary Approach to the protection of fishing communities lags considerably. The principle of intergenerational equity, one of the main tenets of the Precautionary Approach, and the principle of sustainable utilization both imply that the Precautionary Approach should explicitly incorporate the protection of fishing communities, not only the resources they depend on. Risk assessment aims primarily at evaluating the consequences of various harvest strategies in terms of probabilistic statements about future trends in yields, biomass, and dangers to the stock, while risk management involves finding and implementing management policies, strategies, and tactics that reduce the risk to the communities exploiting them. Not all fishery management approaches deal equally well with risk, with some compounding rather than reducing risk. Portfolio management, whereby fishing enterprises have the ability to choose among a diverse portfolio of harvestable resources, would mitigate against the risk of fluctuations in the abundance, availability, or price of individual species. Although much remains to be achieved in better assessing risk, fishery management agencies should immediately implement risk management.

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