Fishery Management Strategies for Addressing Complex Spatial Structure in Marine Fish Stocks

2014 ◽  
pp. 29-57 ◽  
Author(s):  
Jacob P. Kritzer ◽  
Owen R. Liu
Keyword(s):  
Spatial Structure ◽  
Marine Fish ◽  
Fishery Management ◽  
Management Strategies ◽  
Fish Stocks

scholarly journals Environmental Preferences and Fish Handling Practice among European Freshwater Anglers with Different Fishing Specialization Profiles

2021 ◽  
Vol 13 (23) ◽  
pp. 13167
Author(s):  
Emil Andrzej Karpiński ◽  
Andrzej Robert Skrzypczak
Keyword(s):  
Fishery Management ◽  
Management Strategies ◽  
Predatory Fish ◽  
Environmental Preferences ◽  
Fish Stocks ◽  
Recreational Specialization ◽  
Negative Environmental Impact ◽  
Engagement Factors ◽  
Important Form ◽  
Insight Into

Recreational specialization is characteristic of many activities, including recreational fishing, which is a popular and important form of recreation throughout the world. The pressure on the environmental resources used by anglers is increasing. It is becoming crucial to understand the preferences and behaviors of anglers, which can accumulate and multiply the risk of damage to fish stocks and aquatic habitats. The main objective of the study was to comprehensively analyze the differences between anglers with diverse specialization profiles. By investigating the fishing preferences within the context of the socioeconomic, demographic and engagement factors, three groups of anglers were identified: anglers who specialize in predatory fish, anglers who specialize in non-predatory fish and unspecialized anglers. Specialized anglers, regardless of type, were found to be more supportive of releasing caught fish (71% on average) and were less likely to keep them (16%) than unspecialized anglers (55% and 27%, respectively). Unspecialized anglers (26.5% of the surveyed population) show less commitment to ethical values. The potential negative environmental impact of the least specialized anglers is an accumulation of the preferences for the use of ground bait, artificial lures, and live fish as bait. Anglers specializing in predatory fish are the most critical in their evaluation of fish resources and water quality and are least attached to specific fisheries. This work provides insight into angler experience and it may help to better identify anglers who are disrespectful towards the fishing laws in place. The results of this work may be incorporated into fishery management strategies, including strategies to reduce naïve anglers and deter disrespectful anglers, which are lucrative in the fishing process.

scholarly journals Using the LBB Method for the Assessments of Seven Fish Stocks From the Yangtze Estuary and Its Adjacent Waters

2021 ◽  
Vol 8 ◽  
Author(s):  
Yuanchao Wang ◽  
Cui Liang ◽  
Weiwei Xian ◽  
Yibang Wang
Keyword(s):  
Fishery Management ◽  
Management Strategies ◽  
Yangtze Estuary ◽  
Reference Points ◽  
The Yangtze Estuary ◽  
Fish Stocks ◽  
Effective Implementation ◽  
Stock Biomass ◽  
The Status ◽  
Growth Features

The status of fishery resources in the Yangtze estuary and its adjacent waters is still unclear for the effective implementation of fishery management strategies. To help address this gap, a new method especially for data-limited fish stocks (LBB) was applied to assess seven commercially and ecotrophically important fish stocks. Fish specimens were collected in the estuary by bottom trawling quarterly from May 2018 to February 2019. Two historical datasets were collected with the same method in the same area for Indian perch (Jaydia lineata) and sickle pomfret (Pampus echinogaster). To explore the growth features and resilience of fish stocks, auximetric plots and growth performance indices (Φ′) were used. Results showed that common hairfin anchovy (Setipinna tenuifilis) in 2018 and Indian perch in 2018 showed a healthy stock biomass status with complete length structures under a sustainable fishing pressure. The others were outside of safe biological limits or overfished. The Lmean/Lopt < 0.9 in six (67%) of nine LBB models for seven fish stocks suggested that most of the stocks were truncated in length structures. This contribution provides the main fishery reference points regarding stock status that can inform managers and form the basis for various management strategies.

scholarly journals Evaluating the suitability of coupled biophysical models for fishery management

2011 ◽  
Vol 68 (7) ◽  
pp. 1478-1487 ◽  
Author(s):  
Hans-Harald Hinrichsen ◽  
Mark Dickey-Collas ◽  
Martin Huret ◽  
Myron A. Peck ◽  
Frode B. Vikebø
Keyword(s):  
Fishery Management ◽  
Environmental Variability ◽  
Life Stage ◽  
Management Strategies ◽  
Early Life Stage ◽  
Stock Management ◽  
Fish Stocks ◽  
Biophysical Models ◽  
Observation Process ◽  
Transport Patterns

Abstract Hinrichsen, H-H., Dickey-Collas, M., Huret, M., Peck, M. A., and Vikebø, F. B. 2011. Evaluating the suitability of coupled biophysical models for fishery management. – ICES Journal of Marine Science, 68: 1478–1487. The potential role of coupled biophysical models in enhancing the conservation, management, and recovery of fish stocks is assessed, with emphasis on anchovy, cod, herring, and sprat in European waters. The assessment indicates that coupled biophysical models are currently capable of simulating transport patterns, along with temperature and prey fields within marine ecosystems; they therefore provide insight into the variability of early-life-stage dynamics and connectivity within stocks. Moreover, the influence of environmental variability on potential recruitment success may be discerned from model hindcasts. Based on case studies, biophysical modelling results are shown to be capable of shedding light on whether stock management frameworks need re-evaluation. Hence, key modelling products were identified that will contribute to the development of viable stock recovery plans and management strategies. The study also suggests that approaches combining observation, process knowledge, and numerical modelling could be a promising way forward in understanding and simulating the dynamics of marine fish populations.

scholarly journals Depleted marine fish stocks and ecosystem-based management: on the road to recovery, we need to be precautionary

2010 ◽  
Vol 68 (1) ◽  
pp. 212-220 ◽  
Author(s):  
Anna Gårdmark ◽  
Anders Nielsen ◽  
Jens Floeter ◽  
Christian Möllmann
Keyword(s):  
Fisheries Management ◽  
Marine Fish ◽  
Assessment Model ◽  
Fishing Mortality ◽  
Fish Stocks ◽  
The Road ◽  
Stock Status ◽  
Ecosystem Based Management ◽  
Management Plans ◽  
On The Road

Abstract Gårdmark, A., Nielsen, A., Floeter, J., and Möllmann, C. 2011. Depleted marine fish stocks and ecosystem-based management: on the road to recovery, we need to be precautionary. – ICES Journal of Marine Science, 68: 212–220. Precautionary management for fish stocks in need of recovery requires that likely stock increases can be distinguished from model artefacts and that the uncertainty of stock status can be handled. Yet, ICES stock assessments are predominantly deterministic and many EC management plans are designed for deterministic advice. Using the eastern Baltic cod (Gadus morhua) stock as an example, we show how deterministic scientific advice can lead to illusive certainty of a rapid stock recovery and management decisions taken in unawareness of large uncertainties in stock status. By (i) performing sensitivity analyses of key assessment model assumptions, (ii) quantifying the uncertainty of the estimates due to data uncertainty, and (iii) developing alternative stock and ecosystem indicators, we demonstrate that estimates of recent fishing mortality and recruitment of this stock were highly uncertain and show that these uncertainties are crucial when combined with management plans based on fixed reference points of fishing mortality. We therefore call for fisheries management that does not neglect uncertainty. To this end, we outline a four-step approach to handle uncertainty of stock status in advice and management. We argue that it is time to use these four steps towards an ecosystem-based approach to fisheries management.

scholarly journals Essential habitat for sardine juveniles in Iberian waters

2017 ◽  
Vol 81 (3) ◽  
pp. 351 ◽  
Author(s):  
Sílvia Rodríguez-Climent ◽  
Maria Manuel Angélico ◽  
Vítor Marques ◽  
Paulo Oliveira ◽  
Laura Wise ◽  
...  
Keyword(s):  
Fishery Management ◽  
Generalized Additive Models ◽  
Management Strategies ◽  
Coastal Region ◽  
Additive Models ◽  
Spawning Grounds ◽  
Significant Relationships ◽  
Juvenile Abundance ◽  
Spatial Differences ◽  
Core Areas

In a period when the Iberian sardine stock abundance is at its historical minimum, knowledge of the sardine juvenile’s distribution is crucial for the development of fishery management strategies. Generalized additive models were used to relate juvenile sardine presence with geographical variables and spawning grounds (egg abundance) and to model juvenile abundance with the concurrent environmental conditions. Three core areas of juvenile distribution were identified: the Northern Portuguese shelf (centred off Aveiro), the coastal region in the vicinity of the Tagus estuary, and the eastern Gulf of Cadiz. Spatial differences in the relationship between juvenile presence and egg abundances suggest that essential juvenile habitat might partially differ from the prevailing spawning grounds. Models also depicted significant relationships between juvenile abundance, temperature and geographical variables in combination with salinity in the west and with zooplankton in the south. Results indicate that the sardine juvenile distribution along the Iberian Peninsula waters are an outcome of a combination of dynamic processes occurring early in life, such as egg and larva retention, reduced mortality and favourable feeding grounds for both larvae and juveniles.

Assessing population sustainability and response to fishing in terms of aggregation structure for greenlip abalone (Haliotis laevigata) fishery management

2004 ◽  
Vol 61 (2) ◽  
pp. 247-259 ◽  
Author(s):  
Natalie A Dowling ◽  
Stephen J Hall ◽  
Richard McGarvey
Keyword(s):  
Egg Production ◽  
Fishery Management ◽  
Management Strategies ◽  
South Australia ◽  
Fertilization Success ◽  
Adult Density ◽  
Demographic Feature ◽  
Data Set ◽  
Functional Relationships ◽  
Aggregation Size

The greenlip abalone (Haliotis laevigata) population in Waterloo Bay, South Australia, has undergone collapse and fishery closure twice since 1978. A rich data set, including survey measures of degree of spatial aggregation, has been gathered over that time and provides a unique opportunity to identify factors accounting for persistence or collapse, an issue that is of significance to abalone fisheries worldwide. Statistical analyses of fishery and survey data were undertaken to infer functional relationships between catch, effort, recruitment, adult density, and extent of aggregation. Catch rates were hyperstable, an observation consistent with the targeting of large aggregations. Statistical analysis of recruitment showed a significant year effect, implying an environmental signal, and suggested that aggregation size impacts fertilization success. Aggregation size grew under closure, suggesting an impact of fishing on this demographic feature. Aggregative behaviour appears to be critical for subpopulation sustainability. Fishery collapse may be triggered by depletion of larger abalone aggregations by heavy fishing, resulting in declines in fertilized egg production. When heavy fishing coincides with unfavourable environmental conditions, recruitment may be insufficient to sustain the subpopulation. If aggregation is similarly critical for other subpopulations, management strategies could be adapted according to the extent of aggregation in each subpopulation.

The Angler in the Environment: Social, Economic, Biological, and Ethical Dimensions

2011 ◽  
Keyword(s):  
Best Practices ◽  
Best Practice ◽  
Research Question ◽  
Management Strategies ◽  
Leisure Activity ◽  
Quality Data ◽  
Fish Stocks ◽  
Catch And Release ◽  
Practice Behaviors ◽  
Negative Impacts

<i>Abstract</i> .—Recreational fishing is popular worldwide. However, the potential negative impacts of this leisure activity can influence the sustainability of targeted fish stocks. Although management strategies are frequently used to control the actions of anglers, participants themselves must ultimately be confident that changes in their behavior will lead to the conservation of recreational fish stocks before regulations are followed and best practices adopted. Directly involving recreational anglers in research used to quantify the value of best practices, such as in the case of catch and release, can help reinforce the notion among anglers that best practice behaviors facilitate conservation and sustainable exploitation. Using the framework of citizen science and the principles of experiential education (immersion, involvement, ownership, and legacy), we present a case study whereby recreational anglers were directly involved in research that tested how attributes of catch-and-release fishing for bonefish <i>Albula </i> spp. can influence the postrelease survival. By accompanying anglers to the shallow flats and actively involving them in hands-on research aimed at addressing relevant behaviors in the context of catch and release, such programs can promote an increased awareness and sense of personal ownership over the research question and the conservation benefits that it intends to facilitate. With data generated through direct involvement, the participation of recreational anglers in our research culminated in the development of a best practices brochure about catch and release for bonefish. It is our experience that research programs involving recreational anglers need to be well conceived and structured so as to adequately balance the quality of the experience for the participants with the need for generating quality data. Welldesigned “research angler” programs as a form of tourism or even ecotourism could help scientists not only to enhance their ability to conduct fisheries research, but also to broaden the impacts of their research program and the speed at which best practices are adopted.

Fish Stock Indicators as Measure for Sustainability

2015 ◽  
pp. 118-182 ◽  
Author(s):  
Violin S. Raykov ◽  
Ivelina Zlateva
Keyword(s):  
Black Sea ◽  
Fishery Management ◽  
Management Strategies ◽  
Age Determination ◽  
Reproductive Potential ◽  
Local Environment ◽  
Point Of View ◽  
The Black Sea ◽  
Fish Stock ◽  
Mortality Estimation

Particular species may be good indicators of specific environmental factors in their local environment. It was found that one of the main objectives for effective and sustainable management of the fish stocks is to make regular annual assessment of the parental stock biomass, length and weight growth, age determination, mortality estimation and reproductive potential estimation. The Black Sea sprat (Sprattus sprattus L.) is a key species in the Black Sea ecosystem. Small pelagic forage fish and especially local one with shared stocks are very important from ecological (key trophic level) and commercial (intensively exploited) point of view. Fishery management strategies must ensure that fishing mortality will not exceed that which corresponds to MSY, and that the biomass will not fall below a predefined threshold. The goal of the chapter is to define the main objectives and measures for sustainable sprat exploitation in order to be in favour of decision makers and fishery managers.

scholarly journals Novel Biorefinery Approach Aimed at Vegetarians Reduces the Dependency on Marine Fish Stocks for Obtaining Squalene and Docosahexaenoic Acid

2020 ◽  
Vol 8 (23) ◽  
pp. 8803-8813 ◽  
Author(s):  
Alok Patel ◽  
Liwen Mu ◽  
Yijun Shi ◽  
Ulrika Rova ◽  
Paul Christakopoulos ◽  
...  
Keyword(s):  
Docosahexaenoic Acid ◽  
Marine Fish ◽  
Fish Stocks

scholarly journals From Safety Net to Point of No Return—Are Small-Scale Inland Fisheries Reaching Their Limits?

2020 ◽  
Vol 12 (18) ◽  
pp. 7299
Author(s):  
Pina Lena Lammers ◽  
Torsten Richter ◽  
Jasmin Mantilla-Contreras
Keyword(s):  
Sustainable Management ◽  
Fishery Management ◽  
Safety Net ◽  
Small Scale ◽  
Current Function ◽  
Fish Stocks ◽  
Inland Fisheries ◽  
Point Of No Return ◽  
Agricultural Yields ◽  
Near Future

Small-scale inland fisheries (SSIF) are a livelihood opportunity for millions of people in developing countries. Understanding the economic, ecological, political and social impacts fishers are coping with can clarify weaknesses and challenges in the fishery management. Using the SSIF at Lake Alaotra, Madagascar, as an example, we analyzed the development and fishers’ perception of, and adaptation strategies to, change. We surveyed fish catches to assess the state of fish stocks and conducted interviews to understand fishers’ livelihood, problems, behavior and attitudes. Our results show that the fishery sector of Lake Alaotra has grown dramatically although fish catches have fallen sharply. Changes in species composition and low reproduction rates reflect the fishing pressure. A point of no return seems near, as decreasing agricultural yields force farmers to enter the fishery sector as a form of livelihood diversification. Lake Alaotra reflects an alarming trend which can already be seen in many regions of the world and may affect a growing number in the near future. The Alaotran fisheries demonstrate that SSIF’s ability to provide livelihood alternatives under conditions of insecurity will become increasingly important. It further highlights that the identification of ongoing livelihood dynamics in order to disclose possible poverty trap mechanisms and to understand fisheries’ current function is essential for sustainable management.

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