MANAGING HARVESTING TO MINIMIZE THE IMPACT OF EPIDEMICS ON WILD FISH STOCKS

2008 ◽  
Vol 17 (2) ◽  
pp. 103-121 ◽  
Author(s):  
ALEXANDER G. MURRAY
Keyword(s):  
Wild Fish ◽  
Fish Stocks ◽  
The Impact

scholarly journals The impact of alternative rebuilding strategies to rebuild overfished stocks

2016 ◽  
Vol 73 (9) ◽  
pp. 2190-2207 ◽  
Author(s):  
Chantel R. Wetzel ◽  
André E. Punt ◽  
Keyword(s):  
West Coast ◽  
Life Histories ◽  
Estimation Error ◽  
The United States ◽  
Fish Stocks ◽  
Strategy Evaluation ◽  
The Us ◽  
History Of ◽  
The Impact ◽  
Us West

Abstract Ending overfishing and rebuilding fish stocks to levels that provide for optimum sustainable yield is a concern for fisheries management worldwide. In the United States, fisheries managers are legally mandated to end overfishing and to implement rebuilding plans for fish stocks that fall below minimum stock size thresholds. Rebuilding plans should lead to recovery to target stock sizes within 10 years, except in situations where the life history of the stock or environmental conditions dictate otherwise. Federally managed groundfish species along the US West Coast have diverse life histories where some are able to rebuild quickly from overfished status, while others, specifically rockfish (Sebastes spp.), may require decades for rebuilding. A management strategy evaluation which assumed limited estimation error was conducted to evaluate the performance of alternative strategies for rebuilding overfished stocks for these alternative US West Coast life histories. Generally, the results highlight the trade-off between the reduction of catches during rebuilding vs. the length of rebuilding. The most precautionary rebuilding plans requiring the greatest harvest reduction resulted in higher average catches over the entire projection period compared with strategies that required a longer rebuilding period with less of a reduction in rebuilding catch. Attempting to maintain a 50% probability of rebuilding was the poorest performing rebuilding strategy for all life histories, resulting in a large number of changes to the rebuilding plan, increased frequency of failing to meet rebuilding targets, and higher variation in catch. The rebuilding plans that implemented a higher initial rebuilding probability (≥60%) for determining rebuilding fishing mortality and targets generally resulted in fewer changes to the rebuilding plans and rebuilt by the target rebuilding year, particularly for stocks with the longer rebuilding plans (e.g. rockfishes).

The impact of organochlorines and metals on wild fish living in a tropical hydroelectric reservoir: bioaccumulation and histopathological biomarkers

2014 ◽  
Vol 497-498 ◽  
pp. 293-306 ◽  
Author(s):  
Marcelo Gustavo Paulino ◽  
Tayrine Paschoaletti Benze ◽  
Helen Sadauskas-Henrique ◽  
Marise Margareth Sakuragui ◽  
João Batista Fernandes ◽  
...  
Keyword(s):  
Wild Fish ◽  
Hydroelectric Reservoir ◽  
The Impact

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

The impact of trace metals on wild fish living in Crisul-Negru river from North-Western Romania: Bioaccumulation and histopathological biomarkers

2015 ◽  
Vol 238 (2) ◽  
pp. S128
Author(s):  
P. Albu ◽  
B. Onita ◽  
E. Baranyai ◽  
S. Harangi ◽  
S. Keki ◽  
...  
Keyword(s):  
Trace Metals ◽  
Wild Fish ◽  
The Impact ◽  
North Western ◽  
Western Romania

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 Estimating the mortality caused by great cormorant predation on fish stocks: pikeperch in the Archipelago Sea, northern Baltic Sea, as an example

2016 ◽  
Vol 73 (1) ◽  
pp. 84-93 ◽  
Author(s):  
Outi Heikinheimo ◽  
Pekka Rusanen ◽  
Katja Korhonen
Keyword(s):  
Age Groups ◽  
Total Mortality ◽  
Sensitivity Analyses ◽  
Fish Stock ◽  
Great Cormorant ◽  
Phalacrocorax Carbo ◽  
Fish Stocks ◽  
Archipelago Sea ◽  
Phalacrocorax Carbo Sinensis ◽  
The Impact

Estimates of the mortality rates caused by cormorants are needed to assess the impact on fish stock dynamics and fisheries. In this study, we calculated the annual instantaneous mortality caused by great cormorants (Phalacrocorax carbo sinensis) on young pikeperch (Sander lucioperca), using data from Archipelago Sea, southwestern coast of Finland. The pikeperch are vulnerable to cormorant predation mainly at the ages 2–4. The annual instantaneous mortality caused by cormorants was between 0.04 and 0.13, and the estimated effect on the pikeperch stock size at recruitment to the fishery ranged from 4% to 23%, respectively. The average annual cormorant-induced mortality accounted for 5%–34% of the total mortality in these age groups. The sensitivity analyses proved that the rates of mortality from other sources largely affect the estimated mortality from cormorant predation. In cases with strong fluctuations in the abundance of the prey fish stocks, ignoring the size and density dependence of the natural mortality may lead to overestimation of the importance of cormorants as competitors of 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

Ocean Recovery

2019 ◽  
Author(s):  
Ray Hilborn ◽  
Ulrike Hilborn
Keyword(s):  
Fisheries Management ◽  
Marine Ecosystems ◽  
Popular Media ◽  
Fish Stock ◽  
General Audience ◽  
Fish Stocks ◽  
The Status ◽  
Comprehensive Survey ◽  
Graduate Seminars ◽  
The Impact

Over the last 2 decades, the scientific and popular media have been bombarded by gloom-and-doom stories on the future of fisheries, the status of fish stocks, and the impact of fishing on marine ecosystems. Dozens of certification and labeling schemes have emerged to advise consumers on what seafood is sustainable. In recent years, an opposing narrative has emerged emphasizing the success of fisheries management in many places, the increasing abundance of fish stocks in those places, and the prescription for sustainable fisheries. However, there has been no comprehensive survey of what really constitutes sustainability in fisheries, fish stock status, success and failures of management, and consideration of the impacts of fishing on marine ecosystems. This book will explore very different perspectives on sustainability and bring together the data from a large number of studies to show where fish stocks are increasing, where they are declining, the consequences of alternative fisheries management regimes, and what is known about a range of fisheries issues such as the impacts of trawling on marine ecosystems. Aimed principally at a general audience that is already interested in fisheries but seeks both a deeper understanding of what is known about specific issues and an impartial presentation of all of the data rather than selected examples used to justify a particular perspective or agenda. It will also appeal to the scientific community eager to know more about marine fisheries and fishing data, and serve as the basis for graduate seminars on the sustainability of natural resources.

scholarly journals Does recreational catch impact the TAC for commercial fisheries?

2014 ◽  
Vol 72 (2) ◽  
pp. 450-457 ◽  
Author(s):  
Margit Eero ◽  
Harry V. Strehlow ◽  
Charles M. Adams ◽  
Morten Vinther
Keyword(s):  
Fisheries Management ◽  
General Framework ◽  
Stock Assessment ◽  
Commercial Fisheries ◽  
Crucial Aspect ◽  
Total Allowable Catch ◽  
Fish Stocks ◽  
Management Advice ◽  
The Impact ◽  
Baltic Cod

Abstract The western Baltic cod is one of the first fish stocks in Europe that, since 2013, includes recreational catches in stock assessment and fisheries management advice. In this paper, we investigate the sensitivity of the calculated commercial total allowable catch (TAC) to including recreational catches in stock assessment. Our results show that the most crucial aspect in terms of the impact on commercial TAC is the assumption on recreational catch dynamics relative to that of commercial fisheries used in forecast. The results were less sensitive to the information on the historical amount and age structure of recreational catch. Our study is intended to inform potential debates related to resource allocation between the commercial and recreational sectors and contribute to developing a general framework for incorporating recreational catches in fisheries management advice in ICES.

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