scholarly journals Stock Recovery

2020 ◽  
Author(s):  
Keyword(s):  
Stock Recovery

scholarly journals Adverse consequences of stock recovery: European hake, a new “choke” species under a discard ban?

2014 ◽  
Vol 16 (4) ◽  
pp. 563-575 ◽  
Author(s):  
Alan R Baudron ◽  
Paul G Fernandes
Keyword(s):  
European Hake ◽  
Stock Recovery

The Role of Precaution in Stock Recovery Plans in a Fishery with Habitat Effect

2018 ◽  
Vol 146 ◽  
pp. 359-369 ◽  
Author(s):  
Rachel Nichols ◽  
Satoshi Yamazaki ◽  
Sarah Jennings
Keyword(s):  
Habitat Effect ◽  
Stock Recovery

Recruitment Variability and Its Implication for Managing and Rebuilding the Georges Bank Haddock (Melanogrammus aeglefinus) Stock

1986 ◽  
Vol 43 (4) ◽  
pp. 748-753 ◽  
Author(s):  
William J. Overholtz ◽  
Michael P. Sissenwine ◽  
Stephen H. Clark
Keyword(s):  
Melanogrammus Aeglefinus ◽  
Georges Bank ◽  
Fishing Mortality ◽  
Initial Strategy ◽  
Low Probability ◽  
The Relationship ◽  
Constant Growth ◽  
Spawning Biomass ◽  
Haddock Melanogrammus Aeglefinus ◽  
Stock Recovery

The Georges Bank haddock (Melanogrammus aeglefinus) fishery has fluctuated dramatically since the early 1960's. Abundance declined from the mid-1960's to the mid-1970's, partially recovered, and has declined again since 1980. In general, poor year-classes have been associated with a low spawning biomass although the relationship is variable. The fishery was simulated by using the Baranov catch equation, constant growth and natural mortality, and stochastic levels of recruitment whose probabilities correspond to historic patterns in the stock and recruitment data. Simulations suggest a low probability for stock recovery and improved yield under current conditions (F ≈ 0.5). Recovery time increased with increases in fishing mortality (F), and beyond F = 0.40 recovery is unlikely within 25 yr. With recruitment of a very large year-class (100 million fish) an initial strategy providing for a relatively low level of F(= 0.10) for 3−5 yr, followed by exploitation at historically sustainable levels (F = 0.35), would result in stock recovery. With recruitment of a smaller year-class (50 million fish) low initial levels (F = 0.10) and subsequent management at or near F0.1 (F = 0.26) would be required to initiate stock recovery and reasonable harvest levels in future years.

Wastewater treatment by infiltration percolation: a case study

2000 ◽  
Vol 41 (1) ◽  
pp. 77-84 ◽  
Author(s):  
V. Mottier ◽  
F. Brissaud ◽  
P. Nieto ◽  
Z. Alamy
Keyword(s):  
Vadose Zone ◽  
High Water ◽  
Faecal Coliforms ◽  
Dune Sands ◽  
Seaside Resort ◽  
Load Monitoring ◽  
Oxidation Performance ◽  
Kinetics Of ◽  
Stock Recovery

A 1700 p.e. pilot infiltration percolation plant treating the sewage of Mazagon, a seaside resort in the South of Spain, is investigated. Primary effluents, intermittently applied over twin 200 m2 infiltration basins, percolate down to the aquifer through unsaturated dune sands. Each application sequence delivers a volume of 0.25 m3 per m2 of infiltration basin. Analyses of the water sampled at five depths ranging from 0.3 to 2.0 m below the infiltration surface show that the oxidation performance of the plant is highly dependent on the applied load. Monitoring the oxygen content in the air phase of the vadose zone allows to determine the kinetics of the oxygen stock recovery and the oxidation capacity of the plant. Disappointing removal of faecal coliforms and streptococci is attributed to high pore water velocities due to infiltration heterogeneity and the high water height applied during each feeding sequence.

scholarly journals Rebuilding depleted fish stocks: the good, the bad, and, mostly, the ugly

2010 ◽  
Vol 67 (9) ◽  
pp. 1830-1840 ◽  
Author(s):  
Steven A. Murawski
Keyword(s):  
Life Histories ◽  
International Negotiations ◽  
Fish Populations ◽  
Annual Rate ◽  
Fishing Mortality ◽  
Mixed Species ◽  
Fish Stocks ◽  
Biomass Recovery ◽  
Over Time ◽  
Stock Recovery

Abstract Murawski, S. A. 2010. Rebuilding depleted fish stocks: the good, the bad, and, mostly, the ugly. – ICES Journal of Marine Science, 67: 1830–1840. Recovery of depleted fish populations has become an important theme in national and international negotiations and commitments regarding sustainability. Although up to 63% of fish stocks worldwide may be in need of rebuilding, only 1% are currently classified as “rebuilding”, and fewer yet have been “rebuilt”. Recent history in stock recovery provides a rich source of examples of rebuilding plans across a spectrum of execution (“good”, “bad”, “ugly”, and “in progress”). Of 24 depleted stocks with formal plans that successfully reduced the fishing mortality, all but one exhibited signs of recovery. The median instantaneous annual rate of biomass recovery (0.16) was similar to the rate of depletion (−0.14) experienced, but stocks with more vulnerable life histories recovered substantially slower than they had been depleted. Most successful rebuilding programmes have incorporated substantial, measurable reductions in fishing mortality at the onset, rather than relying on incremental small reductions over time. A particularly vexing issue is the differential pace of recovery among relatively productive and unproductive components of mixed-species fisheries. Rebuilding the majority of stocks classified worldwide as “overfished” will take a more effective, consistent, and politically supported stock-recovery paradigm, if society is eventually to meet its articulated sustainability goals for global fisheries.

scholarly journals Rebuilding depleted fish stocks: biology, ecology, social science, and management strategies

2010 ◽  
Vol 67 (9) ◽  
pp. 1825-1829 ◽  
Author(s):  
Cornelius Hammer ◽  
Olav Sigurd Kjesbu ◽  
Gordon H. Kruse ◽  
Peter A. Shelton
Keyword(s):  
Social Science ◽  
Management Strategies ◽  
Panel Discussion ◽  
Reproductive Potential ◽  
Research Focus ◽  
Fish Stocks ◽  
Recovery Strategies ◽  
The Subject ◽  
Subject Material ◽  
Stock Recovery

Abstract Hammer, C., Kjesbu, O. S., Kruse, G. H., and Shelton, P. A. 2010. Rebuilding depleted fish stocks: biology, ecology, social science, and management strategies. – ICES Journal of Marine Science, 67: 1825–1829. This is an introduction to an ICES/PICES symposium entitled as in the title of this manuscript. During the symposium, five theme sessions embraced the subject material under the headings “Impact of fisheries and environmental impacts on stock structure, reproductive potential, and recruitment dynamics”, “Trophic controls on stock recovery”, “Methods for analysing and modelling stock recovery”, “Social and economic aspects of fisheries management and governance”, and “Management and recovery strategies”. A panel discussion provided a valuable overview of current understanding and research focus.

scholarly journals Framework of stock-recovery strategies: analyses of factors affecting success and failure

2010 ◽  
Vol 67 (9) ◽  
pp. 1849-1855 ◽  
Author(s):  
Cornelius Hammer ◽  
Christian von Dorrien ◽  
Christopher C. E. Hopkins ◽  
Fritz W. Köster ◽  
Einar M. Nilssen ◽  
...  
Keyword(s):  
Model Building ◽  
Recovery Period ◽  
Scientific Basis ◽  
Performance Criteria ◽  
Rapid Reduction ◽  
Factors Affecting ◽  
Fish Stocks ◽  
Successful Recovery ◽  
Recovery Strategies ◽  
Stock Recovery

Abstract Hammer, C., von Dorrien, C., Hopkins, C. C. E., Köster, F. W., Nilssen, E. M., St John, M., and Wilson, D. C. 2010. Framework of stock-recovery strategies: analyses of factors affecting success and failure. – ICES Journal of Marine Science, 67: 1849–1855. The EU FP6 UNCOVER project was aimed at producing a rational scientific basis for developing recovery strategies for some ecologically and socio-economically important fish stocks/fisheries in European seas. The immediate objectives were to identify changes experienced during stock depletion/collapses, to understand prospects for recovery, to enhance the scientific understanding of the mechanisms of recovery, and to formulate recommendations on how best to implement long-term management/recovery plans. We extended an earlier analysis conducted within the project of 13 performance criteria in relation to the recovery of more than 30 fish stocks/fisheries worldwide by multivariate exploratory analysis (canonical correspondence analysis), followed by model building [discriminant analysis (DA)] to quantify the relative importance of key performance criteria, singly or combined. Using the existing database, DA indicated that the four best additive predictors of successful recovery were “rapid reduction in fishing mortality”, “environmental conditions during the recovery period”, “life-history characteristics” of the target stock, and “management performance criteria”. The model classified the status “recovered” and “non-recovered” assigned originally with nearly 100% accuracy.

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