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.

scholarly journals A multi-stock harvest control rule based on “pretty good yield” ranges to support mixed-fisheries management

2019 ◽  
Author(s):  
Dorleta Garcia ◽  
Paul J Dolder ◽  
Ane Iriondo ◽  
Claire Moore ◽  
Raúl Prellezo ◽  
...  
Keyword(s):  
Fisheries Management ◽  
Stock Assessment ◽  
Holistic Approach ◽  
Fishing Mortality ◽  
Fish Stocks ◽  
Control Rule ◽  
Harvest Control Rule ◽  
The Impact ◽  
Ecosystem Based Fisheries Management

Abstract Advice for commercially exploited fish stocks is usually given on a stock-by-stock basis. In light of the ecosystem-based fisheries management, the need to move towards a holistic approach has been largely acknowledged. In addition, the discard bans in some countries requires consistent catch advice among stocks to mitigate choke species limiting fisheries activity. In this context, in 2015, the European Commission proposed the use of fishing mortality ranges around fishing mortality targets to give flexibility to the catch advice system and improve the use of fishing opportunities in mixed-fisheries. We present a multi-stock harvest control rule (HCR) that uses single stock assessment results and fishing mortality ranges to generate a consistent catch advice among stocks. We tested the performance of the HCR in two different case studies. An artificial case study with three stocks exploited simultaneously by a single fleet and the demersal mixed-fishery operating in Bay of Biscay and Celtic Sea. The HCR produced consistent catch advice among stocks when there was only a single fleet exploiting them. Even more, the HCR removed the impact of the discard ban. However, in a multi-fleet framework the performance of the HCR varied depending on the characteristics of the fleets.

scholarly journals IMPLIKASI IUU FISHING DALAM PENGELOLAAN SUMBER DAYA IKAN DI INDONESIA

2017 ◽  
Vol 1 (1) ◽  
pp. 61
Author(s):  
Subhat Nurhakim
Keyword(s):  
Fisheries Management ◽  
World Wide ◽  
Stock Assessment ◽  
National Plan ◽  
Fish Stocks ◽  
Fisheries Resources ◽  
Iuu Fishing ◽  
Global Concern ◽  
The Impact ◽  
Fishing Practices

Pada tatanan dunia, regional, dan nasional, dewasa ini isu kegiatan yang berkaitan dengan IUU fishing adalah merupakan ancaman utama terhadap sediaan ikan. Telah banyak inisiatif international yang didukung oleh organisasi internasional seperti FAO telah menyiapkan International Plan of Action dari IUU Fishing. Walaupun jumlah negara yang mencoba mengembangkan National Plan of Action dari IUU Fishing terus bertambah, tetapi dalam beberapa hal, kegiatan IUU Fishing merupakan hal yang banyak terjadi dan merupakan ancaman nyata terhadap perikanan lokal. Adalah benar bahwa perhatian dunia terhadap IUU Fishing terus meningkat sebagai akibat yang nyata penurunan sediaan ikan dunia secara drastis. Perkiraan kasar secara keseluruhan menunjukkan bahwa paling tidak 30% dari hasil tangkapan perikanan dunia diperoleh dari kegiatan IUU Fishing. Ini memperlihatkan bahwa masalah IUU Fishing tersebut meningkat dengan kuat, terutama bila dilihat dari percepatan penurunan ketersediaan sumber daya perikanan. Tulisan ini menyajikan hal-hal yang berkaitan dengan pengkajian sediaan dan pengelolaan perikanan seperti juga halnya kegiatan IUU Fishing yang terjadi di Indonesia. Dampak IUU Fishing terhadap hasil pengkajiaan sediaan pada akhirnya digunakan sebagai informasi dasar untuk pengelolaan perikanan juga dibahas. Rekomandasi disampaikan dalam kaitannya untuk mengurangi kegiatan IUU Fishing dan meningkatkan pengkajian sediaan ikan dan pengelolaan perikanan.At global, regional, and national levels, issues associated with IUU fishing activities currently constitute a major world-wide threat to fisheries stocks. There have already been many international initiatives supported by international organizations such as the FAO which have been engaged in the International Plan of Action on IUU fishing. Although an increasing number of countries are trying to develop national plan of actions on IUU fishing, in many parts, IUU fishing practices are still common place and constitute a real threat to local fishers. Indeed, there is increasing global concern about IUU fishing practices due to the fact that global fish stocks are declining drastically. Approximate estimations suggest that overall at least 30% of world-wide fisheries catch is obtained from IUU fishing activities. This shows that the problem is increasingly severe, especially in view of the accelerating overall decline in available fisheries resources. This paper presents briefly regarding stock assessment and fisheries management as well as IUU fishing activities that undertake in Indonesian waters. The impact of IUU fishing to the result of stock assessment, that finally used as basic information for fisheries management is also discuss. Recommendation ismade in relation to eliminate IUU fishing activities and improvement of stock assessment and fisheries management.

How to Make Individual Transferable Quotas Work Economically, Socially, and Environmentally

2018 ◽  
Author(s):  
Rashid Sumaila
Keyword(s):  
Fisheries Management ◽  
Sustainable Use ◽  
Fish Stock ◽  
Open Market ◽  
Economic Returns ◽  
Total Allowable Catch ◽  
Fish Stocks ◽  
Individual Transferable Quotas ◽  
Management Objectives ◽  
Ecosystem Based Fisheries Management

The economic tool of individual transferable quotas (ITQs) gives their owners exclusive and transferable rights to catch a given portion of the total allowable catch (TAC) of a given fish stock. Authorities establish TACs and then divide them among individual fishers or firms in the form of individual catch quotas, usually a percentage of the TAC. ITQs are transferable through selling and buying in an open market. The main arguments by proponents of ITQs is that they eliminate the need to “race for the fish” and thus increase economic returns while eliminating overcapacity and overfishing. In general, fisheries’ management objectives consist of ecological (sustainable use of fish stocks), economic (no economic waste), and social (mainly the equitable distribution of fisheries benefits) issues. There is evidence to show that ITQs do indeed reduce economic waste and increase profits for those remaining in fisheries. However, they do not perform well in terms of sustainability or socially. A proposal that integrates ITQs in a comprehensive and effective ecosystem-based fisheries management system that is more likely to perform much better than ITQs with respect to ecological, economic, and social objectives is presented in this article.

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 An investigation into fisheries interaction effects using Atlantis

2014 ◽  
Vol 72 (1) ◽  
pp. 275-283 ◽  
Author(s):  
Michael D. Smith ◽  
Elizabeth A. Fulton ◽  
Robert W. Day
Keyword(s):  
Fisheries Management ◽  
Carrying Capacity ◽  
Stock Assessment ◽  
Single Species ◽  
Interaction Effects ◽  
Fishing Effort ◽  
Maximum Sustainable Yield ◽  
Simultaneous Increase ◽  
Total Catch ◽  
The Impact

Abstract Fisheries management is commonly based on the outputs of single-species stock assessment models. While such models are appropriate for tactical issues such as quota setting, they typically omit explicit trophic interactions between different parts of the ecosystem. To successfully manage multiple fisheries in the same ecosystem, we need to understand how fishing one species may indirectly affect other species. In this paper, we used a simulation model of the southern Benguela ecosystem, built in the Atlantis framework, to explore fisheries interaction effects. We first measured the impact of fishing different stocks individually at FMSY, the hypothetical level of fishing effort which produces maximum sustainable yield (MSY) in a single-species modelling context. We then applied FMSY to all stocks simultaneously and compared the simultaneous yield with the sum of yields from the individual applications of FMSY. Contrary to expectations, the total catch was higher under the simultaneous scenario. We explored our results by studying the influences of trophic interaction between species at different levels of the foodweb, and found that our overall result was driven by two key factors: volumetric dominance of small pelagic fish in the total catch, and asymmetric influences of competition and predation between piscivorous and planktivorous species. The simultaneous increase in fishing pressure across multiple species in the model led to increased effective carrying capacity for small pelagic species (due to reduced competition), but reduced carrying capacity for piscivorous species (due to reduced small pelagic prey). This work has important implications for the design of tactical multispecies models for use in ecosystem-based fisheries management.

scholarly journals Interpreting catch per unit effort data to assess the status of individual stocks and communities

2006 ◽  
Vol 63 (8) ◽  
pp. 1373-1385 ◽  
Author(s):  
Mark N. Maunder ◽  
John R. Sibert ◽  
Alain Fonteneau ◽  
John Hampton ◽  
Pierre Kleiber ◽  
...  
Keyword(s):  
Relative Abundance ◽  
Stock Assessment ◽  
Limited Information ◽  
Catch Per Unit Effort ◽  
Fish Stocks ◽  
Unit Effort ◽  
Strategy Evaluation ◽  
The Status ◽  
Catch Rates ◽  
Management Advice

AbstractDespite being one of the most common pieces of information used in assessing the status of fish stocks, relative abundance indices based on catch per unit effort (cpue) data are notoriously problematic. Raw cpue is seldom proportional to abundance over a whole exploitation history and an entire geographic range, because numerous factors affect catch rates. One of the most commonly applied fisheries analyses is standardization of cpue data to remove the effect of factors that bias cpue as an index of abundance. Even if cpue is standardized appropriately, the resulting index of relative abundance, in isolation, provides limited information for management advice or about the effect of fishing. In addition, cpue data generally cannot provide information needed to assess and manage communities or ecosystems. We discuss some of the problems associated with the use of cpue data and some methods to assess and provide management advice about fish populations that can help overcome these problems, including integrated stock assessment models, management strategy evaluation, and adaptive management. We also discuss the inappropriateness of using cpue data to evaluate the status of communities. We use tuna stocks in the Pacific Ocean as examples.

Integrating marine protected areas with catch regulation

2006 ◽  
Vol 63 (3) ◽  
pp. 642-649 ◽  
Author(s):  
Ray Hilborn ◽  
Fiorenza Micheli ◽  
Giulio A De Leo
Keyword(s):  
Protected Areas ◽  
Marine Protected Areas ◽  
Larval Dispersal ◽  
Single Species ◽  
Maximum Sustainable Yield ◽  
Fish Stock ◽  
Total Allowable Catch ◽  
Fish Stocks ◽  
The Impact ◽  
Stock Abundance

Previous models of marine protected areas (MPAs) have generally assumed that there were no existing regulations on catch and have frequently shown that MPAs, by themselves, can be used to maintain both sustainable fish stocks and sustainable harvests. We explore the impact of implementing an MPA in a spatially structured model of a single-species fish stock that is regulated by total allowable catch (TAC). We find that when a stock is managed at maximum sustainable yield, or is overfished, implementation of an MPA will require a reduction in TAC to avoid increased fishing pressure on the stock outside the MPA. In both cases, catches will be lower as a result of overlaying an MPA on existing fisheries management. Only when the stock is so overfished that it is headed towards extinction does an MPA not lead to lower catches. In a TAC-regulated fishery, even if the stock is overfished, MPA implementation may not improve overall stock abundance or increase harvest unless catch is simultaneously reduced in the areas outside the MPA. Models that consider differential adult and larval dispersal need to be explored to see if these results are found with the more complex biology of a two-stage model.

Assessment of Lamprey and Fish Stocks in the Great Lakes in Relation to Control of the Sea Lamprey (Petromyzon marinus): Report from the SLIS Assessment Measurements Task Force

1980 ◽  
Vol 37 (11) ◽  
pp. 2197-2201 ◽  
Author(s):  
P. S. Maitland
Keyword(s):  
Great Lakes ◽  
Prey Species ◽  
Task Force ◽  
Stock Assessment ◽  
Control Program ◽  
Sea Lamprey ◽  
Nontarget Organisms ◽  
Fish Stocks ◽  
Important Prey ◽  
The Impact

Available and potential methodology for assessing lamprey and prey fish populations is related to existing and future requirements of the sea lamprey control program of the Great Lakes Fishery Commission (GLFC). For lamprey, we recommend that the classification of Great Lakes tributaries according to their potential for larval production and the quality of lamprey attack data should be improved and standardized; standardized collections of spawning run adults should be continued; research should be encouraged on attractants and repellents, a male sterilization program, and the biology of parasitic phase animals. For fish, we recommend that more emphasis be given to the precision and standardization of estimates to allow better comparison between places and years, and the assessment of fish stocks other than major prey species; the GLFC support an evaluation program of an important prey species; and that other assessment methods (e.g. acoustic; counts of entrained fish) be explored. Because lamprey control is a long-term process that may span periods of environmental change, monitoring of physical, chemical, and biotic factors should be encouraged. Research on the impact of lampricides on nontarget organisms should be expanded. We also discuss and offer suggestions on the future of sea lamprey control.Key words: stock assessment, fishery surveys, methodology, populations control, proposed research

Overfishing

2017 ◽  
Author(s):  
Ray Hilborn
Keyword(s):  
Protected Areas ◽  
Fisheries Management ◽  
Marine Protected Areas ◽  
Popular Media ◽  
Fish Stock ◽  
Fish Stocks ◽  
Dramatic Decline ◽  
Fish Catch ◽  
The Impact ◽  
Globally Stable

This chapter calls into question the veracity of stories, often seen in the scientific literature and popular media, describing the collapse of fish stocks and predicting a soon-to-be-seen dramatic decline in food production from the ocean. In fact, detailed scientific analyses suggest that fish stock abundance is globally stable, and much of the decline in fish catch has been due to more stringent management of fisheries in many countries. This has led to a polarization between those who look at abundance trends, and argue that improving fisheries management is the solution, and those who look at catch and argue that fisheries management does not work and marine protected areas are needed. Data clearly support the effectiveness of fisheries management, whereas remarkably little data demonstrates the impact of marine protected areas outside of the closed areas. This chapter argues the actual impacts of MPAs need to be evaluated much more intensively.

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