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Journal articles on the topic "Social aspects of Fish stock assessment"
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Ye, Guanqiong, Ying Lin, Cuicui Feng, Loke Ming Chou, Qutu Jiang, Panpan Ma, Shengyun Yang, et al. "Could the wild population of Large Yellow Croaker Larimichthys crocea (Richardson) in China be restored? A case study in Guanjingyang, Fujian, China." Aquatic Living Resources 33 (2020): 24. http://dx.doi.org/10.1051/alr/2020025.
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Over 90% of the world's fisheries have been fully exploited or over-fished. Included is the large yellow croaker (Larimichthys crocea), an important commercial fish species in China whose population was nearly depleted prior to the 1980s. Although overfishing and natural resources collapse present a daunting issue, some studies indicate that improved management strategies could aid in natural stock restoration to prevent depletion. We developed an integrated assessment method grounded on an ecosystem-based approach and deigned an integrated index with three key aspects of habitat suitability, natural population status and government & social interventions, to evaluate the potential restoration capacity of the species in a designated “national aquatic germplasm resource protected area” in Guanjinyang based on a data set spanning 1987 to 2015. The results show that although restoration efforts on research and rehabilitation have increased greatly since late 1990s, the effectiveness stays moderate and the natural population remains near depletion.
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Maynou, Francesc. "Coviability analysis of Western Mediterranean fisheries under MSY scenarios for 2020." ICES Journal of Marine Science 71, no. 7 (April 16, 2014): 1563–71. http://dx.doi.org/10.1093/icesjms/fsu061.
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An ecosystem approach to fisheries (EAF) seeks to manage fisheries sustainably, including all dimensions of fisheries: biological, social and economic aspects. The separate management of these aspects may lead to conflicting objectives. Coviability analysis helps us to rank a set of choices (alternative management measures) objectively, allows us to explore which policies will ensure strong sustainability, and formally recognizes the multi-objective nature of fisheries management. The coviability of the main Western Mediterranean Spanish fisheries was examined with a bioeconomic simulation model under alternative management strategies that implement strong fishing mortality reduction policies. Based on a joint (biological and economic) viability assessment, it has been shown that Western Mediterranean fisheries require the reduction of fishing effort to ∼10% of the 2010 levels. This strong conservation measure would need to be applied as soon as possible in order for European Mediterranean fisheries to be managed at MSY, as required by legally binding international agreements, which may be unrealistic. Large reductions in fishing mortality for stocks that have been subject to high exploitation rates for decades are difficult to achieve with the current paradigm of effort control in the Mediterranean. Instead, reorienting the exploitation of Mediterranean fish stocks with management measures that combine changes in exploitation patterns with seasonal or spatial area closures, should help meet the policy goals of fishing mortality levels compatible with MSY by 2020.
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Hammer, Cornelius, Olav Sigurd Kjesbu, Gordon H. Kruse, and Peter A. Shelton. "Rebuilding depleted fish stocks: biology, ecology, social science, and management strategies." ICES Journal of Marine Science 67, no. 9 (May 13, 2010): 1825–29. http://dx.doi.org/10.1093/icesjms/fsq039.
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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.
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Cámara, Angeles, and Rosa Santero-Sánchez. "Economic, Social, and Environmental Impact of a Sustainable Fisheries Model in Spain." Sustainability 11, no. 22 (November 10, 2019): 6311. http://dx.doi.org/10.3390/su11226311.
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In recent decades, fishing sustainability has been subject to intense international debate. Overfishing and contamination of the marine environment are elements that contribute to a reduction in fish stock and catches, often leading to declining income and employment, especially in rural areas. We present a sustainable fisheries model that promotes artisanal fishing while incorporating replacement rates of fish stock and actions that benefit the fishing industry. First, the sustainable fisheries model defines the guidelines and actions that may apply either together or independently, sequentially, or simultaneously, according to a defined budget. These concrete actions are quantified and incorporated into an environmentally extended input-output model to evaluate the economic impact on the Spanish fishing industry. The impact is complemented with an assessment of social impact (employment) and environmental impact (estimated reduction of CO2 emissions).
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Ziegler, Philippe Eric. "Influence of data quality and quantity from a multiyear tagging program on an integrated fish stock assessment." Canadian Journal of Fisheries and Aquatic Sciences 70, no. 7 (July 2013): 1031–45. http://dx.doi.org/10.1139/cjfas-2012-0413.
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Using a modeling framework for toothfish (Dissostichus spp.) population dynamics, fishing, and data collection, this study investigated how the bias and precision of biomass estimates from an integrated tag-based assessment are influenced by various aspects of a multiyear tagging program, particularly the effects of the size of tagged fish compared with the size of fish in the catch (tag size-overlap), numbers of tagged fish, duration of the tagging program, using catch-at-length or catch-at-age data as auxiliary data, and stock depletion levels. Biomass estimates generally improved with more and better-quality tagging data. The results showed that even when tag releases were distributed over a relatively large number of size classes, low recapture numbers collected in short tagging programs with a 100% tag size-overlap were sufficient for robust and unbiased assessments. Particularly in the early stages of the tagging program, a high tag size-overlap was imperative to maximize the likelihood of a robust assessment. Biomass estimates were largely unaffected by the stock depletion level; however, using catch-at-age compared with catch-at-length improved recruitment estimates and resulted in more conservative biomass estimates.
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Sukhodolov, Alexander, Andrei Fedotov, Mikhail Makarov, Pavel Anoshko, Alina Kolesnikova, Yakov Sukhodolov, and Polina Sorokina. "Eco-legal and economic aspects of developing Malomorsky fishing area of Lake Baikal." Fisheries 2021, no. 1 (February 15, 2021): 20–26. http://dx.doi.org/10.37663/0131-6184-2021-1-20-26.
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Lake Baikal is the largest fresh water reservoir of our planet and a unique natural site included in the UNESCO World Heritage List. Meanwhile, Baikal is not only Russia’s largest freshwater fishing reservoir. Large-scale commercial fishing started here at the beginning of the 19th century and, with small breaks caused by bans imposed on industrial fishing due to depletion of valuable commercial fishery species stock, continued until October 2017, when once again restrictions in the fishing industry were imposed. One of the reasons for this was the increasing of the illegal unreported and unregulated fishing which led to depletion of harvestable stock of omul. However, these restrictions neither eliminated extensive unreported fishing, nor solved the problem of rapid fish stock rebuilding in the unique lake. Using methods of mathematical analysis and modeling this article examines factors facilitating breach of law in the fishing industry and unreported fishing for Baikal omul. The article provides a brief characteristic of the Baikal oldest Malomorsky fishing area as well as an eco-economic assessment of the possibility to rebuild the fishing stock within this water zone taking into account the increasing tourist flow in the Baikal region.
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Melnyk, Viktor, Maksym Zhytar, Roman Shchur, Nataliia Kriuchkova, and Tetiana Solodzhuk. "Assessment of the Performance of the Financial Architecture of Ukrainian Economy: Budgetary, Stock and Social Aspects." WSEAS TRANSACTIONS ON BUSINESS AND ECONOMICS 18 (January 27, 2021): 386–95. http://dx.doi.org/10.37394/23207.2021.18.39.
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The article describes the scientific and methodological approach to assessing the effectiveness of the financial architecture of Ukraine's economy on the basis of recommended values of the system of indicators, determining their type, allowable intervals of values taking into account micro- and macrofinancial levels of the hierarchy. The comparative analysis of the corresponding indicators on the countries of the EU and Ukraine for 2009-2018 is presented. The future directions of dynamics of indicators of efficiency of functioning of financial architecture of economy of Ukraine are offered
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Möllmann, Christian, Martin Lindegren, Thorsten Blenckner, Lena Bergström, Michele Casini, Rabea Diekmann, Juha Flinkman, et al. "Implementing ecosystem-based fisheries management: from single-species to integrated ecosystem assessment and advice for Baltic Sea fish stocks." ICES Journal of Marine Science 71, no. 5 (August 24, 2013): 1187–97. http://dx.doi.org/10.1093/icesjms/fst123.
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Abstract Theory behind ecosystem-based management (EBM) and ecosystem-based fisheries management (EBFM) is now well developed. However, the implementation of EBFM exemplified by fisheries management in Europe is still largely based on single-species assessments and ignores the wider ecosystem context and impact. The reason for the lack or slow implementation of EBM and specifically EBFM is a lack of a coherent strategy. Such a strategy is offered by recently developed integrated ecosystem assessments (IEAs), a formal synthesis tool to quantitatively analyse information on relevant natural and socio-economic factors, in relation to specified management objectives. Here, we focus on implementing the IEA approach for Baltic Sea fish stocks. We combine both tactical and strategic management aspects into a single strategy that supports the present Baltic Sea fish stock advice, conducted by the International Council for the Exploration of the Sea (ICES). We first review the state of the art in the development of IEA within the current management framework. We then outline and discuss an approach that integrates fish stock advice and IEAs for the Baltic Sea. We intentionally focus on the central Baltic Sea and its three major fish stocks cod (Gadus morhua), herring (Clupea harengus), and sprat (Sprattus sprattus), but emphasize that our approach may be applied to other parts and stocks of the Baltic, as well as other ocean areas.
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Gilliland, Ted E., James N. Sanchirico, and J. Edward Taylor. "An integrated bioeconomic local economy-wide assessment of the environmental impacts of poverty programs." Proceedings of the National Academy of Sciences 116, no. 14 (March 15, 2019): 6737–42. http://dx.doi.org/10.1073/pnas.1816093116.
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A new generation of poverty programs around the globe provides cash payments to poor and vulnerable households. Studies show that these social cash transfer programs create income and welfare benefits for poor households and the local economies where they live. However, this may come at the cost of damaging local environments if cash payments stimulate food production that conflicts with natural resource conservation. Evaluations of the economic impacts of poverty programs do not account for the welfare consequences of environmental impacts, which are potentially large for poor communities closely tied to natural resources. We use an ex-ante policy simulation tool, a bioeconomic local computable general equilibrium model parameterized with microsurvey data, to analyze the expected welfare consequences of environmental degradation caused by a cash transfer program. For a Philippine fishing community that is a net importer of fish, we show that a government cash transfer program initially increases real incomes for all households. However, increased demand for fish leads to a decline in the local fish stock that reduces program benefits. Household groups experience declines in real income benefits of 2–63%, with fishing households suffering the largest declines. Impacts on local fish stocks depend on the extent to which markets link fishing communities to outside regions through trade. Greater market integration can mitigate the fish stock decline, but this reduces the local income benefits of cash transfers.
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Kerr, Lisa A., Steven X. Cadrin, David H. Secor, and Nathan G. Taylor. "Modeling the implications of stock mixing and life history uncertainty of Atlantic bluefin tuna." Canadian Journal of Fisheries and Aquatic Sciences 74, no. 11 (November 2017): 1990–2004. http://dx.doi.org/10.1139/cjfas-2016-0067.
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Atlantic bluefin tuna (Thunnus thynnus) is currently managed as two separate eastern and western stocks, despite information indicating considerable stock mixing. Using a simulation model, we explored how scenarios of population-specific migration and uncertainty in aspects of bluefin tuna biology affect the magnitude, distribution, and mixed stock nature of the resource and catch of its associated fisheries. The analytical framework was a stochastic, age-structured, stock-overlap model that was seasonally and spatially explicit with movement of eastern- and western-origin tuna informed by tagging and otolith chemistry data. Alternate estimates of movement and assumptions regarding maturity and recruitment regime for western-origin fish were considered. Simulation of the operating model indicated considerable stock mixing in the western and central Atlantic, which resulted in differences between the stock and population view of western bluefin tuna. The relative biomass of the western population and its spatial and temporal distribution in the Atlantic was sensitive to model assumptions and configurations. Simulation modeling can provide a means to ascertain the potential consequences of stock mixing on the assessment and management of fishery resources.
Dissertations / Theses on the topic "Social aspects of Fish stock assessment"
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Huchzermeyer, Carl Friedrich. "Fish and fisheries of Bangweulu wetlands, Zambia." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1003927.
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Bangweulu Wetlands is a 6000 km² public-private-partnership conservation area in northeastern Zambia, lying on the south-eastern margins of the Bangweulu Swamps, Congo River system. The area is important for wildlife conservation, tourism and as a fishing ground for the local inhabitants. This study provides a baseline of the fish and fisheries of this area. The conservation area is situated on the transition zone between woodland, floodplain and swamp. A total of 42 fish species representing 12 taxonomic families were collected. The fish fauna of the area was characterised by a diversity of small cyprinids (14 species), cichlids (9 species), clariid catfishes (4 species) and mormyrids (4 species). Species such as Clarias gariepinus, C. ngamensis, Marcusenius macrolepidotus, Tilapia rendali, T. sparrmanii and several small Barbus species were shared with adjacent floodplain systems such as the upper Zambezi and Kafue rivers. Fishing was undertaken by fishing groups consisting of a fisherman and his family, or a group of men fishing together. Access to the fishing grounds was controlled by traditional fishing leaders, who collected tribute from fishermen. Fishing groups utilised fixed, distinct fishing areas determined by ancestry. The most important time for fishing was during the drawdown phase of the floodplains, from March until June. During the dry season fewer groups were engaged in fishing, with many having returned to farming activities. The main fishing methods of the floodplain fishery were basket traps and mosquito-mesh funnel nets set into earth fish barriers (fish weirs) constructed on the plains, various mesh sizes of gillnets, hook longlines and seine nets. The use of fish spears, drag baskets and piscicides was of lesser importance. Most fishing gears were constructed of a variety of natural and modern, manufactured materials. The fishery was multi-species and 23 fish species were recorded from in catch. The three most important species in the catches were C. gariepinus, T. rendalli and M. macrolepidotus. Together these contributed 67% by weight to the catch. Catch-per-unit-effort (CPUE) for the different gears was 0.4 ± 0.3 kg.trap.night⁻¹ for basket traps, 2.7 ± 4.6 kg.net.night⁻¹ for funnel nets, 0.3 ± 0.5 kg.50 m net.night⁻¹ for gill nets, 3.5 ± 6.3 kg.100 hooks.night⁻¹ for longlines, 1.79 ± 1.11 kg.haul⁻¹ for mosquito-mesh seine nets and 6.87 ± 6.27 kg.haul⁻¹ for larger-mesh seine nets. The weight of average daily landings of fishing groups, using a variety of gears was 7.8 ± 7.4 kg. Fishermen were able to maintain the same catch rate between dry and wet seasons, with no significant differences (p < 0.05) in daily landings between seasons. Yield per fisherman for a seven month season, which required 2-3 relocations due to falling water level, was 1.64 t based on catch assessment, and 1.9 t from a socio-economic survey. A tentative yield per area estimate for the area was 2I7 kg.ha⁻¹ over the three month shallow-floodplain fishing season. Most fish landed in the fishery were processed into sundried or smoke-dried products. These were used for 1) home consumption, 2) trade with village farmers (from up to 70 km inland of the fishing grounds) in exchange for staple starch meal, and 3) sold to urban fish traders, reaching markets as distant as Lubumbashi in Democratic Republic of Congo. Fish traders toured fishing camps to buy fish, supporting auxiliary industries such as transport and accommodation services. The price for dried fish at source was 3.14 ± 1.34 USDlkg and the market price reported for the Zambian Copperbelt was 6.14 ± 2.54 USD/kg. Typical returns on investment in fish trading were estimated as 68-77%. The fishery was considered to be biologically and socially sustainable. By harvesting a seasonally transient assemblage of species with high productivity and biological turnover rates and with life histories adapted to high mortality, fishermen were able to maintain a stable and viable livelihood. Management recommendations for the area were that a fisheries management plan be developed that would seek to strengthen the traditional system of rights-allocation, address problems between fishing and tourism activities, and enhance communication between fisheries and conservation stakeholders. To do this it was recommended that: 1) conservation authorities recognise the importance of the fishery, 2) no changes to current effort levels and fishing methods were necessary, 3) points 1 and 2 above be used to improve communication and trust between conservation authorities and fishermen, 4) customary resource-access mechanisms be understood and strengthened so that local inhabitants' rights to the resource are protected, 5) fishermen help formulate and accept conservation and tourism rules, 6) tourists and guides be made aware of the function of the fishery, 7) a fisheries management forum of key community, government and conservation stakeholders be formed to shape and implement the fisheries management plan, 8) locally-adapted bylaws be created to legitimise crucial floodplain gears currently considered illegal (e.g. mosquito-net gears, fish weirs), 9) no intervention to formalise fish trading be made, and 10) a trained person with a fisheries background be hired oversee the implementation of the recommendations.
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McCafferty, James Ross. "An assessment of inland fisheries in South Africa using fisheries-dependent and fisheries-independent data sources." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1005072.
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The role of inland fisheries as contributors to local and national economies in developing African countries is well documented. In South Africa, there is increasing interest in inland fisheries as vehicles for achieving national policy objectives including food security, livelihoods provision, poverty alleviation and economic development but there is surprisingly little literature on the history, current status, and potential of inland fishery resources. This lack of knowledge constrains the development of management strategies for ensuring the biological sustainability of these resources and the economic and social sustainability of the people that are dependent on them. In order to contribute to the knowledge base of inland fisheries in South Africa this thesis: (1) presents an exhaustive review of the available literature on inland fisheries in South Africa; (2) describes the organisation of recreational anglers (the primary users of the resource); (3) compiles recreational angling catch records and scientific gill net survey data, and assesses the applicability of these data for providing estimates of fish abundance (catch-per-unit effort [CPUE]); and finally, (4) determines the potential for models of fish abundance using morphometric, edaphic, and climatic factors. The literature review highlighted the data-poor nature of South African inland fisheries. In particular information on harvest rates was lacking. A lack of knowledge regarding different inland fishery sectors, governance systems, and potential user conflicts was also found. Recreational anglers were identified as the dominant user group and catch data from this sector were identified as potential sources of fish abundance and harvest information. Formal freshwater recreational angling in South Africa is a highly organised, multi-faceted activity which is based primarily on angling for non-native species, particularly common carp Cyprinus carpio and largemouth bass Micropterus salmoides. Bank anglers constituted the largest number of formal participants (5 309 anglers affiliated to formal angling organisations) followed by bass anglers (1 184 anglers affiliated to formal angling organisations). The highly structured nature of organised recreational angling and dominant utilisation of inland fisheries resources by this sector illustrated not only the vested interest of anglers in the management and development of inland fisheries but also the role that anglers may play in future decision-making and monitoring through the dissemination of catch data from organised angling events. Generalised linear models (GLMs) and generalised additive models (GAMs) were used to standardise CPUE estimates from bass- and bank angling catch records, which provided the most suitable data, and to determine environmental variables which most influenced capture probabilities and CPUE. Capture probabilities and CPUE for bass were influenced primarily by altitude and conductivity and multiple regression analysis revealed that predictive models incorporating altitude, conductivity, surface area and capacity explained significant (p<0.05) amounts of variability in CPUE (53%), probability of capture (49%) and probability of limit bag (74%). Bank angling CPUE was influenced by conductivity, surface area and rainfall although an insignificant (p>0.05) amount of variability (63%) was explained by a predictive model incorporating these variables as investigations were constrained by small sample sizes and aggregated catch information. Scientific survey data provided multi-species information and highlighted the high proportion of non-native fish species in Eastern Cape impoundments. Gillnet catches were influenced primarily by species composition and were less subject to fluctuations induced by environmental factors. Overall standardised gillnet CPUE was influenced by surface area, conductivity and age of impoundment. Although the model fit was not significant at the p<0.05 level, 23% of the variability in the data was explained by a predictive model incorporating these variables. The presence of species which could be effectively targeted by gillnets was hypothesised to represent the most important factor influencing catch rates. Investigation of factors influencing CPUE in impoundments dominated by Clarias gariepinus and native cyprinids indicated that warmer, younger impoundments and smaller, colder impoundments produced higher catches of C. gariepinus and native cyprinids respectively. A predictive model for C. gariepinus abundance explained a significant amount of variability (77%) in CPUE although the small sample size of impoundments suggests that predictions from this model may not be robust. CPUE of native cyprinids was influenced primarily by the presence of Labeo umbratus and constrained by small sample size of impoundments and the model did not adequately explain the variability in the data (r² = 0.31, p>0.05). These results indicate that angling catch- and scientific survey data can be useful in providing predictions of fish abundance that are biologically realistic. However, more data over a greater spatial scale would allow for more robust predictions of catch rates. This could be achieved through increased monitoring of existing resource users, the creation of a centralised database for catch records from angling competitions, and increased scientific surveys of South African impoundments conducted by a dedicated governmental function.
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Donovan, Bruce. "A retrospective assessment of the Port Alfred linefishery with respect to the changes in the South African fisheries management environment." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1008298.
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Since the study on the Port Alfred/Kenton-on-Sea/Boknes linefishery by Hecht and Tilney (1989) there have been substantive changes to the linefish management environment in South Africa. Using the Port Alfred linefishery as a model, the aim of this study was to evaluate the effectiveness of the linefish management regulations that were implemented by Marine and Coastal Management (MCM) since 1992, and to assess the behaviour and 'status' of the fishery in response to these changes. Changes to both the licensing structure and catch regulations have had a significant effect on the functioning of many aspects of the Port Alfred linefishery (fishing effort, catch composition, cpue) as well as on the structure of the fishery and its socio-economic profile. Overall commercial cpue decreased from 1985 to 1998. Since 1998 there has been a significant increase in cpue (from 2.3 Kg.fisher⁻¹ hour⁻¹ to a peak of 4.8 Kg.fisher⁻¹.hour⁻¹ in 2005. This was attributed to good catches of geelbek, particularly in 2005, 2007 and 2008 (during these years geelbek contributed an average of 35% to the total landings in comparison to a mean contribution of II % between 1985 and 2004). However, size spectra analysis suggests that the increase in overall cpue since 1998 misrepresents the actual status of the fishery. If geelbek is excluded from the analysis on the grounds that it is the only species in the fishery that is highly migratory, susceptible to recruitment fluctuations and it does not contribute to the catches on a year round basis, then the results suggest that the fishery is still in a declining phase despite the 80% reduction in commercial effort and numerous stricter catch regulations (e.g. size/bag limits). Furthermore, the cpue of silver kob, which has been the "mainstay" species of the fishery, has consistently declined over the last 23 year period (from 1.69 Kg.fisher⁻1 .hour1 in 1986 to 0.86 Kg.fisher⁻1.hour⁻1in 2007). The substantial reduction in commercial effort in the fishery from 33 vessels in 2001 to 13 in 2002 resulted in a shift from commercial to recreational fishing. The number of active commercial vessels in Port Alfred alone decreased from 29 in 1989 (Hecht 1993) to four in 2008. During the same timeframe, the number of regularly active recreational vessels had almost doubled (16 in 1989 to 26 in 2008). Despite the greater number of recreational boats in the fishery they only landed approximately half the average yearly tonnage of the commercial vessels (21,5 and 44,7 tonnes,annum-I , respectively) between 2006 and 2008, This was ascribed to the differences in catch regulations for the two sectors, Furthermore, it was speculated that increasing operating costs and narrowing profit margins have contributed to lower levels of compliance in both the commercial and recreational sectors since 2006, For example, 16% of silver kob landed during 2006-08 were under the minimum size, Despite the changes made to the regulations since 1998 and the 60,6% reduction In legislated commercial effort in the fishery between 2001 and 2002 it was concluded that the fishery has continued to decline, Except for the good recruitment of geelbek (which may be due to regulatory changes made in 1992) the changes in the management environment have had no measurable positive effect on this fishery, It is recommended that commercial effort should not be allowed to increase beyond the current number of active boats, that there should be an area restriction on all commerciallinefish vessels, that the current recreational bag limit for silver kob should be re-assessed, there should also be a concerted and nationally funded effort to educate recreational anglers about the merits of catch and release, and the frequency of catch inspections of both sectors should be increased,KMBT_363
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Parker, Denham. "The life history and fishery assessment of largespot pompano, Trachinotus botla, in northern KwaZulu-Natal, South Africa." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1005141.
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Largespot pompano, Trachinotus botla, is a surf zone carangid with a cosmopolitan distribution in subtropical and tropical waters. Within South Africa, the species occurs along the KwaZulu-Natal coastline where it is a popular recreational fishing target. Recreational fishing in southern Africa has developed significantly in recent years, and is now regarded as an industry with huge economic potential. The long-term contribution of South African recreational fisheries to local economies is reliant upon sustainable exploitation through effective management. Trachinotus botla was found to grow rapidly with maximum observed age of six years. Otolith growth zone deposition was validated using edge analysis. Growth was similar between males and females until ~350 mm FL after which females continued to grow while growth in males slowed. The resulting overall sex ratio was slightly female-biased (1 male: 1.3 females). Trachinotus botla matures early with all fish considered to be mature at 290 mm FL, which corresponds to an age of three years. A protracted spawning season was observed ranging from November to February and there was evidence to suggest that T. botla is a serial spawner. Dietary analysis indicates that T. botla is an opportunistic predator with a catholic diet. The opportunistic utilization of “superabundant” prey items is a fundamental characteristic of the species feeding habits. An ontogenetic dietary shift was observed at approximately 300 mm FL that was linked to a shift in habitat preference. This thesis provided the first evidence that infection by the tongue-replacing isopod, Cymothoa borbonica, reduces the growth rate of wild host fish populations despite not affecting the diet, feeding habits and feeding frequency of their hosts. These results also highlighted the inadequacy of condition factor as a proxy for quantifying the effects of cymothoids on their hosts, and identified the need to incorporate host age when assessing the effects of parasite infection. Information on the life-cycle of C. borbonica, including estimates of the hypothesized “infectious” period and its longevity were obtained through analysis of parasite infection patterns as a function of host age and length. An assessment of the T. botla shore fishery of KwaZulu-Natal using historical catch data revealed that the fishery is stable. Productivity of the T. botla fishery increased towards the north of KwaZulu-Natal. Distinct seasonal variations in the T. botla fishery were also noted with catches peaking in summer months and lowest during winter. A per-recruit assessment revealed that the species is currently underexploited (SBR = 62% of pristine levels), and fishing mortality rate could be doubled before reaching the spawner biomass-per recruit target reference point of FSB₄₀. A combination of the life history characteristics of species, the nature of the recreational shore fishery together with the current management regulation of 5 fish person⁻¹ day⁻¹ has ensured the sustainable utilization of the T. botla resource in KwaZulu-Natal.
Books on the topic "Social aspects of Fish stock assessment"
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Memorial University of Newfoundland. Institute of Social and Economic Research., ed. Fishing for truth: A sociological analysis of northern cod stock assessments from 1977 to 1990. St. John's, Nfld: Institute of Social and Economic Research, Memorial University of Newfoundland, 1994.
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Finlayson, Alan Christopher. Fishing for truth: A sociological analysis of northern cod stock assessments from 1977 to 1990. St. John's, Nfld: Institute of Social and Economic Research, Memorial University of Newfoundland, 1994.
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Gilk, Sara E. Genetic stock identification of McDonald Lake sockeye salmon in selected southeast Alaska fisheries, 2007-2009. Anchorage: Alaska Dept. of Fish and Game, Division of Sport Fish, Research and Technical Services, 2013.
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Workshop, on Stock Assessment and Social Science Careers (2000 Woods Hole Mass ). Recruiting fishery scientists: Workshop on Stock Assessment and Social Science Careers. Washington, DC: National Academy Press, 2000.
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Arve, Misund Ole, ed. Dynamics of pelagic fish distribution and behaviour: Effects on fisheries and stock assessment. Oxford: Fishing News Books, 1999.
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Nesler, Thomas P. Interactions between endangered fishes and introduced gamefishes in the Yampa River, Colorado, 1987-1991. Fort Collins, CO (317 West Prospect, Fort Collins 80526): Colorado Division of Wildlife, Aquatic Research Section, 1995.
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(US), National Research Council. Recruiting Fishery Scientists: Workshop on Stock Assessment and Social Science Careers (Compass series). National Academies Press, 2001.
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Freon, Pierre, and Ole Arve Misund. Dynamics of Pelagic Fish Distribution and Behaviour: Effects on Fisheries and Stock Assessment (Fishing News Books). Fishing News Books, 1998.
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General Fisheries Commission for the Mediterranean (Food and Agriculture Organization of the United Nations), ed. Report of the expert meeting to identify the needs for a subsidiary body on the technical and socio-economic aspects of aquaculture in the Mediterranean: Santiago de Compostela, Spain, 2-3 June 2006. Rome: Food and Agriculture Organization of the United Nations, 2007.
Find full textBook chapters on the topic "Social aspects of Fish stock assessment"
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Sadikaj, Rigerta Ali. "The Assessment of the Exploitable Fish Reserves (Stock Assessment)." In Advances in Environmental Engineering and Green Technologies, 266–304. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8333-4.ch008.
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This chapter explains some theoretical and technical aspects of stock assessments that may be familiar to those directly involved in fisheries science and analysis of fish populations. The information about stock and recruitment concepts, assessment of population growth, natural and fishing moralities, selectivity of fishing gears and relationship between catch and selectivity. It is written particularly for persons involved in scientific activity, for students and for stakeholders who have never been exposed to formal fisheries science training, but are interested in better understanding complicated fisheries concepts. An enhanced knowledge of assessment concepts and fisheries science will promote an increased understanding of fisheries management and give stakeholders greater confidence as they participate in fisheries management process. Understanding how all factors interact is a challenging task, even for experts in fisheries science.
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"Propagated Fish in Resource Management." In Propagated Fish in Resource Management, edited by THEODORE I. J. SMITH, WALLACE E. JENKINS, MICHAEL R. DENSON, and MARK R. COLLINS. American Fisheries Society, 2004. http://dx.doi.org/10.47886/9781888569698.ch5.
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<em>Abstract.</em>—The red drum <em>Sciaenops ocellatus </em>is a popular sport fish from the mid-Atlantic through the Gulf of Mexico. Historical data show that this species supported substantial commercial as well as recreational fisheries. On the Atlantic Coast, the Atlantic States Marine Fisheries Commission (ASMFC) has designated this fish as “over-harvested” requiring all coastal states to implement fishery restrictions. Regulations from North Carolina to Florida range from one fish to five fish per day within a narrow slot length limit. Unlike many states, South Carolina (SC) has implemented a multifaceted management approach involving regular monitoring of subadults and adults, strict regulations, and evaluation of stocking red drum. To provide a fishery independent assessment of the population, an inshore monitoring program for subadults was begun in 1991, and in 1994, an offshore monitoring component focused on the adult segment of the population was added. This latter population segment is the focus of the ASMFC’s Fishery Management Plan. The first regulations in SC were established in 1986, and in 2001, regulations were amended for the seventh time to make them the strictest ever. In an effort to explore all management options, a research effort was initiated in 1988 to examine the potential for increasing abundance using stocked fish. Based on encouraging research findings, this program was expanded in 2002 to a statewide demonstration scale effort involving three estuarine systems. These systems were stocked with a total of 1.8 million marked fish in fall, 2002. Stocking project components integrate fishery dependent and independent sampling to assess biological implications and social and economic aspects are being added to provide a broad overview of impacts. Through this integrated approach of fishery and population monitoring, landings restrictions, and stocking of fish, it is hoped that red drum abundance can be increased more rapidly than by using traditional management techniques alone.
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"Incorporating Uncertainty into Fishery Models." In Incorporating Uncertainty into Fishery Models, edited by Gregg T. Waugh and Susan Shipman. American Fisheries Society, 2002. http://dx.doi.org/10.47886/9781888569315.ch3.
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<em>Abstract.—</em> This paper focuses on greater amberjack management in the South Atlantic region, with an examination of the deficiencies in data collection and resulting impacts on the amberjack stock assessment and management decisions. This is a case study of uncertainty leading to more conservative, risk-averse management. Amberjack management in the South Atlantic is illustrative of the debate of whether you do what you can with what you have versus not doing anything until you have good information. Ultimately one has to ask what are the consequences to resource management. While National Standard #2 says you must base your decisions on the best scientific information, scientific information entails more than just the stock assessment results. It entails other biological information as well as social and economic information. The South Atlantic Fishery Management Council went as far as we could without opening ourselves up to a legal challenge. We attempted to balance concern for the resource, Florida’s desire to be more conservative, skepticism about the data, and the fishermen’s desire to fish.
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"Incorporating Uncertainty into Fishery Models." In Incorporating Uncertainty into Fishery Models, edited by Gregg T. Waugh and Susan Shipman. American Fisheries Society, 2002. http://dx.doi.org/10.47886/9781888569315.ch3.
Full textAbstract:
<em>Abstract.—</em> This paper focuses on greater amberjack management in the South Atlantic region, with an examination of the deficiencies in data collection and resulting impacts on the amberjack stock assessment and management decisions. This is a case study of uncertainty leading to more conservative, risk-averse management. Amberjack management in the South Atlantic is illustrative of the debate of whether you do what you can with what you have versus not doing anything until you have good information. Ultimately one has to ask what are the consequences to resource management. While National Standard #2 says you must base your decisions on the best scientific information, scientific information entails more than just the stock assessment results. It entails other biological information as well as social and economic information. The South Atlantic Fishery Management Council went as far as we could without opening ourselves up to a legal challenge. We attempted to balance concern for the resource, Florida’s desire to be more conservative, skepticism about the data, and the fishermen’s desire to fish.
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"The Angler in the Environment: Social, Economic, Biological, and Ethical Dimensions." In The Angler in the Environment: Social, Economic, Biological, and Ethical Dimensions, edited by Katrin Daedlow, T. Douglas Beard, and Robert Arlinghaus. American Fisheries Society, 2011. http://dx.doi.org/10.47886/9781934874240.ch2.
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<i>Abstract</i> .—In this paper, we describe and contrast the features of common and public fishing rights regimes in inland recreational fisheries management, using Germany as an example of a common property rights regime and the United States as an example of a public property rights regime. The German case is further distinguished into a common property rights regime at the regional level in “East Germany” (conducted by angler associations) and at the local level in “West Germany” (conducted by angling clubs). Comparisons are done using established concepts from propertyrights theory and common-pool resource literature followed by a discussion of strength and weaknesses of sustainable resource management for the different property-rights regimes examined. The strengths of common property rights regimes, particularly if on a small scale such as in West Germany, include good possibilities for controlling angling effort, fostering traditional ecological knowledge, and developing emotional attachments to local fisheries. Moreover, the high level of anglers’ involvement in local decision making facilitates intensive communication among anglers and between anglers and managers, which may result in timely conflict resolution, commitment to rules, and peer pressure towards rule compliance. Strengths of public property rights regimes for inland recreational fisheries, as in the United States, include a high professional standard for conducting monitoring and stock assessment activities along with the ability to develop a landscape perspective for recreational fisheries management. This facilitates scale matching to solve problems based on science-based planning of regulations and management intervention, which may better avoid the pitfalls of “one-size-fits-all” policies. Irrespective of the governance system in place, a risk of pronounced rivalry among users for access to common-pool resources, such as fish stocks within defined boundaries of either state, angler association, or angling club waters, remains. This highlights the need for continued enforcement of rules and regulations along with continued communication with stakeholders. This is particularly challenging in large-scale management systems, as in East Germany and the United States. Our paper forms a basis for further research on recreational fisheries governance to identify suitable property-rights regimes for specific cultural, social, and ecological settings.