The Experts below are selected from a list of 290322 Experts worldwide ranked by ideXlab platform
Andre E Punt - One of the best experts on this subject based on the ideXlab platform.
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Exploring benefits of spatial cooperative harvesting in a sea urchin Fishery: An agent-based approach
Ecosphere, 2017Co-Authors: Nicolas L. Gutierrez, Peter Halmay, Ray Hilborn, Andre E Punt, Stephen SchroeterAbstract:Sedentary or low-mobility organisms show a high degree of dependency with their substrate, where its heterogeneity often determines small-scale spatial patterns of distribution, life history traits, and Fishery yields. For sea urchins, this spatial structure is usually shaped by food availability, habitat structure, individual movement, and Fishery dynamics. All of these have a significant impact on their physiological and reproductive status and in particular on their gonadal content. These patterns are of particular interest considering that the sea urchin Fishery is a roe Fishery where marketability depends on gonad yield and quality, which in turn is related to spatial and temporal variations in associated kelp beds. Thus, better gonad quality and yields generate higher profits for both fishers (divers) and processors. However, competition among divers within a non-cooperative system creates a “race for shellfish” precluding higher gonad yields per unit of effort. A spatially explicit agent-based model for the San Diego, California red sea urchin (Strongylocentrotus franciscanus) Fishery was developed in order to assess the benefits of cooperative harvesting by depicting spatial and temporal variations in Fishery yields. A cooperative harvesting scenario where divers consistently target those areas with higher yields avoiding low-quality sea urchins was compared against a non-cooperative situation where divers harvest at random or based only on densities of sea urchins. Sea urchin population at the end of the simulation period was 20% higher for the most cooperative scenario compared to the non-cooperative Fishery. Further, for the most cooperative scenario where information sharing among divers is greatest and harvest is coordinated, sea urchin catches were at least 10% higher and gonad yield 35% higher than in the non-cooperative scenario. In this model, information sharing and organized harvesting typical of well-functioning cooperatives allowed fishers to optimize the use of the resource in terms of higher gonad yields per unit of effort while maintaining the productivity of the stock. This study also highlights the importance of community-based management (i.e., collaborative efforts in assessment, management, and governance of fisheries between fishers, scientists, and managers) toward improving fisheries sustainability.
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Adaptive behaviour of fishers to external perturbations: simulation of the Tasmanian rock lobster Fishery
Reviews in Fish Biology and Fisheries, 2014Co-Authors: Katell G. Hamon, Stewart Frusher, L. Richard Little, Olivier Thébaud, Andre E PuntAbstract:The rock lobster, Jasus edwardsii, lies on a global "hotspot" for climate change in the southeastern Australian state of Tasmania. The short-term effects of climate change are predicted to lead to an increasing exploitable biomass in the south and declining biomass in the north of the state. The future of the Fishery is highly uncertain due to climate change, but also due to insecurities linked to the market conditions. The market for Tasmanian rock lobster is driven by the demand of a single market, China, which absorbs 75 % of the catch. This study examines how fishers can adapt to external perturbations that affect the social and economic viability of the fleet and the ecological dynamics of the stock. Three fleet dynamic models of increasing complexity are used to investigate the effects of climate change and lobster price changes on the Fishery. There could be local depletion leading to negative short-term profit for the fleet if it is static and the proportion of the total catch taken in each region of the Fishery does not respond to climate-induced-changes. Better outcomes would occur if the fleet adapts dynamically to environmental conditions, and fishing effort follows stock abundance, which would counter-act the short-term effects of climate change. Only a model with explicit representation of economic drivers can fully capture the local economic and social impacts of large scale global perturbations.
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Communicating climate change: Climate change risk perceptions and rock lobster fishers, Tasmania
Marine Policy, 2012Co-Authors: Melissa Nursey-bray, Stewart Frusher, H. Revill, S. Jennings, Marcus Haward, Alistair J. Hobday, C Gardner, Andre E Punt, Gretta T. Pecl, Ingrid Van PuttenAbstract:World fisheries, already vulnerable, are under increasing pressure from the impacts of climate change. Using the Tasmanian rock lobster industry as a case study, we considered the efficacy of risk perception as a tool to inform how to communicate the science of climate change and suggestions for management in relation to development of adaptation strategies for fisheries. Fishers surveyed in this study operate in a Fishery that is expected to undergo large changes as a consequence of climate change. Fishers also reported observations of similar large changes in the marine environment and lobster Fishery consistent with climate change; yet most fishers surveyed expressed doubts about whether climate change was a real process. The important point for adaption of the industry to climate change is that fisher perceptions of risk tended to create barriers to acceptance of climate change as an issue. This means that there is a barrier to communication and awareness about climate change and thus a barrier to future action on the issue. Improving acceptance of climate change and thus ability to adapt will require the development of communications that are culturally appropriate and palatable to fishers. We argue that the application of social learning principles in communications about climate change may be one constructive way forward. © 2011 Elsevier Ltd.
Jose Luis Acuna - One of the best experts on this subject based on the ideXlab platform.
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Heterogeneous management and conservation perceptions within the gooseneck barnacle co-management system in Asturias (N. Spain)
Marine Policy, 2017Co-Authors: Antonella Rivera, Stefan Gelcich, Lucía García-flórez, Jose Luis AcunaAbstract:Abstract Stakeholders’ perceptions can influence the success of a Fishery. It is important to take these perceptions into account when evaluating the development of a management system and its conservation policies. Structured questionnaires were used to determine fishers’ management and conservation perceptions of the Asturian gooseneck barnacle co-management system. Perceptions were analyzed for the entire Fishery and for different socioeconomic factors, these were: location, age, years in the management system, way of access, alternative income sources and income. Fishers’ perceptions varied widely among socioeconomic factors. In fact, a trade-off between management and conservation perceptions was observed for the different categories within each socioeconomic factor, particularly for the years in the management system, location and income factors. Despite the heterogeneity in perceptions, the co-management system has successfully generated a strong conservation ethic in its resource users. Furthermore, as a group, gooseneck barnacle fishers hold positive perceptions on the performance of the management system. When generating management policies, fisheries’ managers must take the heterogeneity of resource users present in the Fishery into account. The gooseneck barnacle co-management system demonstrates that even within the same Fishery there can be multiple paths to sustainability.
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Trends, drivers, and lessons from a long-term data series of the Asturian (northern Spain) gooseneck barnacle territorial use rights system
Bulletin of Marine Science, 2017Co-Authors: Antonella Rivera, Stefan Gelcich, Lucía García-flórez, Jose Luis AcunaAbstract:The Asturian gooseneck barnacle (Pollicipes pollicipes Gmelin, 1790) Fishery has been managed through territorial use rights in fisheries (TURFs) since its inception >20 yrs ago. As part of this agreement, fishers are allotted exclusive extraction rights and active participation in management strategies. In return for these rights, fishers are responsible for gathering data on effort and extraction in the Fishery. We used the extensive time-series gathered by the fishers to assess the sustainability of the Fishery. Additionally, we used survey techniques to explore the social-ecological drivers of this sustainability. The Fishery has succeeded in maintaining or increasing catch per unit effort in all TURFs. Furthermore, the system has received public approval, where 73% of the stakeholders indicated that the only way to maintain a sustainable gooseneck barnacle Fishery in Asturias is through the current management regime. The system has contributed to the sustainability of the Fishery via: (1) creating a window of opportunity for management of the resource; (2) the continuous incorporation of scientific information and fishers' knowledge into management frameworks; (3) empowerment of the resource users; (4) embracing adaptive capacity through flexible management guidelines; and (5) matching management scales with the main life-history traits of the species. As in any dynamic system, the gooseneck barnacle Fishery is currently faced with important challenges that might impact its sustainability, indicating that there are no simple recipes for fisheries management. Nonetheless, this system provides a set of basic principles for TURFs, which may be conducive to adaptive and sustainable fisheries.
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assessing the sustainability and adaptive capacity of the gooseneck barnacle co management system in asturias n spain
AMBIO: A Journal of the Human Environment, 2016Co-Authors: Antonella Rivera, Stefan Gelcich, Lucia Garciaflorez, Jose Luis AcunaAbstract:The gooseneck barnacle Fishery in Asturias (N. Spain) has undergone three important changes: (1) the early implementation of a co-management system based on Territorial User Rights for Fishing, (2) a change in management measures (due to a decrease in landings), and (3) an economic crisis. This has allowed us to analyze the systems’ sustainability in time through examining five critical variables: landings, effort, catch per unit effort (CPUE), mean market prices, and annual revenue. Additionally, we used focus groups and questionnaires to determine the response of the system to these three changes. Co-management has succeeded in maintaining or increasing CPUE throughout all management areas and produced stable mean market prices. This was achieved through flexible management policies and adaptive strategies adopted by the fishers, such as increased selectivity and diversification. The analysis of this Fishery provides important lessons regarding the need to understand the evolutionary dynamics of co-management and the importance of embracing adaptive capacity.
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co management in europe insights from the gooseneck barnacle Fishery in asturias spain
Marine Policy, 2014Co-Authors: Antonella Rivera, Stefan Gelcich, Lucia Garciaflorez, Jorge Luis Alcazar, Jose Luis AcunaAbstract:In recent years, cooperative management systems have received attention as a means towards sustainable fisheries. Since its inception and for the past 20 years, the gooseneck barnacle Fishery in the coast of Asturias has been co-managed by assigning Territorial User Rights to fishers׳ associations, allowing fishers to participate actively in the management and data gathering processes. Here, 20 years of landings, in-depth interviews and focus groups were used to characterize the emergence and social-ecological properties of the system. The system consists of 7 management areas each one some tens of kilometers long. The incorporation of fishers׳ knowledge has successfully led to within-area fragmentation of the management units down to single rocks as small as 3m long, which are managed according to different protection levels. The system has empowered resource users and provided an opportunity for the use of both scientific information and fishers׳ knowledge to be integrated in management guidelines. Results suggest the adaptive capacity provided by the co-management framework has been essential to manage this heterogeneous Fishery. The gooseneck barnacle Fishery and its historical developments illustrate the potential for establishing co-management systems for small-scale fisheries in Europe.
Stewart Frusher - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of techniques for estimating Fishery assessment parameters in the Tasmanian Rock Lobster Fishery
2020Co-Authors: Stewart FrusherAbstract:Rock lobsters are one of the premiere seafood products around the world. High demand has led to most lobster fisheries being over or fully exploited. The Tasmanian rock lobster Fishery is no exception and has become a major industry for Tasmania since its rapid commercialisation in the early part of the last century. The Tasmanian Fishery, based on the southern rock lobster Jasus edwardsii, is the backbone of the Tasmanian fishing fleet and provides valuable socio-economic input into many of Tasmania’s coastal rural towns. For this reason, the Government requires scientists to try to provide accurate and precise assessments of this Fishery for their managers. The most recent change in the assessment of this Fishery was the development of a mathematical assessment model. In addition to assessing the current state of the resource, the model has forward projection capabilities so that future harvest strategies can be evaluated. Like all Fishery models, the Tasmanian assessment model is based on a number of assumptions for estimating biomass and egg production. In addition, the model assumes that the dynamics of fishing remain constant from year to year. However, the dynamics of the Fishery are changing as management, technology and markets change the behaviour of fishers. The change to an Individual Transferable Quota management system in 1998 has seen fishers focus on the dollar return per kilogram, rather than maximising their catch, as a way to improve profitability. Global positioning and echo sounder technology enable fishers to locate and chart lobster habitat better than ever before, and the rapid expansion of air transportation has seen the opening of Asian markets for premium priced live lobsters. To ensure that model estimates are reliable under changing patterns of exploitation, model estimates need to be validated. This is best achieved by estimating the same parameters using different techniques. Trials to obtain estimates of exploitation rate and biomass using change-in-ratio (CIR) and index-removal (IR) techniques have provided encouraging results for southern regions of the Tasmanian rock lobster Fishery. The latter two methods require that there be (at least) two surveys within a year, with harvest(s) occurring between surveys. The two methods have generally provided similar results. However, on
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Adaptive behaviour of fishers to external perturbations: simulation of the Tasmanian rock lobster Fishery
Reviews in Fish Biology and Fisheries, 2014Co-Authors: Katell G. Hamon, Stewart Frusher, L. Richard Little, Olivier Thébaud, Andre E PuntAbstract:The rock lobster, Jasus edwardsii, lies on a global "hotspot" for climate change in the southeastern Australian state of Tasmania. The short-term effects of climate change are predicted to lead to an increasing exploitable biomass in the south and declining biomass in the north of the state. The future of the Fishery is highly uncertain due to climate change, but also due to insecurities linked to the market conditions. The market for Tasmanian rock lobster is driven by the demand of a single market, China, which absorbs 75 % of the catch. This study examines how fishers can adapt to external perturbations that affect the social and economic viability of the fleet and the ecological dynamics of the stock. Three fleet dynamic models of increasing complexity are used to investigate the effects of climate change and lobster price changes on the Fishery. There could be local depletion leading to negative short-term profit for the fleet if it is static and the proportion of the total catch taken in each region of the Fishery does not respond to climate-induced-changes. Better outcomes would occur if the fleet adapts dynamically to environmental conditions, and fishing effort follows stock abundance, which would counter-act the short-term effects of climate change. Only a model with explicit representation of economic drivers can fully capture the local economic and social impacts of large scale global perturbations.
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Communicating climate change: Climate change risk perceptions and rock lobster fishers, Tasmania
Marine Policy, 2012Co-Authors: Melissa Nursey-bray, Stewart Frusher, H. Revill, S. Jennings, Marcus Haward, Alistair J. Hobday, C Gardner, Andre E Punt, Gretta T. Pecl, Ingrid Van PuttenAbstract:World fisheries, already vulnerable, are under increasing pressure from the impacts of climate change. Using the Tasmanian rock lobster industry as a case study, we considered the efficacy of risk perception as a tool to inform how to communicate the science of climate change and suggestions for management in relation to development of adaptation strategies for fisheries. Fishers surveyed in this study operate in a Fishery that is expected to undergo large changes as a consequence of climate change. Fishers also reported observations of similar large changes in the marine environment and lobster Fishery consistent with climate change; yet most fishers surveyed expressed doubts about whether climate change was a real process. The important point for adaption of the industry to climate change is that fisher perceptions of risk tended to create barriers to acceptance of climate change as an issue. This means that there is a barrier to communication and awareness about climate change and thus a barrier to future action on the issue. Improving acceptance of climate change and thus ability to adapt will require the development of communications that are culturally appropriate and palatable to fishers. We argue that the application of social learning principles in communications about climate change may be one constructive way forward. © 2011 Elsevier Ltd.
Stefan Gelcich - One of the best experts on this subject based on the ideXlab platform.
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Heterogeneous management and conservation perceptions within the gooseneck barnacle co-management system in Asturias (N. Spain)
Marine Policy, 2017Co-Authors: Antonella Rivera, Stefan Gelcich, Lucía García-flórez, Jose Luis AcunaAbstract:Abstract Stakeholders’ perceptions can influence the success of a Fishery. It is important to take these perceptions into account when evaluating the development of a management system and its conservation policies. Structured questionnaires were used to determine fishers’ management and conservation perceptions of the Asturian gooseneck barnacle co-management system. Perceptions were analyzed for the entire Fishery and for different socioeconomic factors, these were: location, age, years in the management system, way of access, alternative income sources and income. Fishers’ perceptions varied widely among socioeconomic factors. In fact, a trade-off between management and conservation perceptions was observed for the different categories within each socioeconomic factor, particularly for the years in the management system, location and income factors. Despite the heterogeneity in perceptions, the co-management system has successfully generated a strong conservation ethic in its resource users. Furthermore, as a group, gooseneck barnacle fishers hold positive perceptions on the performance of the management system. When generating management policies, fisheries’ managers must take the heterogeneity of resource users present in the Fishery into account. The gooseneck barnacle co-management system demonstrates that even within the same Fishery there can be multiple paths to sustainability.
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Trends, drivers, and lessons from a long-term data series of the Asturian (northern Spain) gooseneck barnacle territorial use rights system
Bulletin of Marine Science, 2017Co-Authors: Antonella Rivera, Stefan Gelcich, Lucía García-flórez, Jose Luis AcunaAbstract:The Asturian gooseneck barnacle (Pollicipes pollicipes Gmelin, 1790) Fishery has been managed through territorial use rights in fisheries (TURFs) since its inception >20 yrs ago. As part of this agreement, fishers are allotted exclusive extraction rights and active participation in management strategies. In return for these rights, fishers are responsible for gathering data on effort and extraction in the Fishery. We used the extensive time-series gathered by the fishers to assess the sustainability of the Fishery. Additionally, we used survey techniques to explore the social-ecological drivers of this sustainability. The Fishery has succeeded in maintaining or increasing catch per unit effort in all TURFs. Furthermore, the system has received public approval, where 73% of the stakeholders indicated that the only way to maintain a sustainable gooseneck barnacle Fishery in Asturias is through the current management regime. The system has contributed to the sustainability of the Fishery via: (1) creating a window of opportunity for management of the resource; (2) the continuous incorporation of scientific information and fishers' knowledge into management frameworks; (3) empowerment of the resource users; (4) embracing adaptive capacity through flexible management guidelines; and (5) matching management scales with the main life-history traits of the species. As in any dynamic system, the gooseneck barnacle Fishery is currently faced with important challenges that might impact its sustainability, indicating that there are no simple recipes for fisheries management. Nonetheless, this system provides a set of basic principles for TURFs, which may be conducive to adaptive and sustainable fisheries.
-
assessing the sustainability and adaptive capacity of the gooseneck barnacle co management system in asturias n spain
AMBIO: A Journal of the Human Environment, 2016Co-Authors: Antonella Rivera, Stefan Gelcich, Lucia Garciaflorez, Jose Luis AcunaAbstract:The gooseneck barnacle Fishery in Asturias (N. Spain) has undergone three important changes: (1) the early implementation of a co-management system based on Territorial User Rights for Fishing, (2) a change in management measures (due to a decrease in landings), and (3) an economic crisis. This has allowed us to analyze the systems’ sustainability in time through examining five critical variables: landings, effort, catch per unit effort (CPUE), mean market prices, and annual revenue. Additionally, we used focus groups and questionnaires to determine the response of the system to these three changes. Co-management has succeeded in maintaining or increasing CPUE throughout all management areas and produced stable mean market prices. This was achieved through flexible management policies and adaptive strategies adopted by the fishers, such as increased selectivity and diversification. The analysis of this Fishery provides important lessons regarding the need to understand the evolutionary dynamics of co-management and the importance of embracing adaptive capacity.
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co management in europe insights from the gooseneck barnacle Fishery in asturias spain
Marine Policy, 2014Co-Authors: Antonella Rivera, Stefan Gelcich, Lucia Garciaflorez, Jorge Luis Alcazar, Jose Luis AcunaAbstract:In recent years, cooperative management systems have received attention as a means towards sustainable fisheries. Since its inception and for the past 20 years, the gooseneck barnacle Fishery in the coast of Asturias has been co-managed by assigning Territorial User Rights to fishers׳ associations, allowing fishers to participate actively in the management and data gathering processes. Here, 20 years of landings, in-depth interviews and focus groups were used to characterize the emergence and social-ecological properties of the system. The system consists of 7 management areas each one some tens of kilometers long. The incorporation of fishers׳ knowledge has successfully led to within-area fragmentation of the management units down to single rocks as small as 3m long, which are managed according to different protection levels. The system has empowered resource users and provided an opportunity for the use of both scientific information and fishers׳ knowledge to be integrated in management guidelines. Results suggest the adaptive capacity provided by the co-management framework has been essential to manage this heterogeneous Fishery. The gooseneck barnacle Fishery and its historical developments illustrate the potential for establishing co-management systems for small-scale fisheries in Europe.
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Fishery management in Japan
Ecological Research, 2010Co-Authors: Hiroyuki Matsuda, Mitsutaku Makino, Minoru Tomiyama, Stefan Gelcich, Juan Carlos CastillaAbstract:There are few legal marine protected areas in Japan rather than fishing-ban areas. Fishers did not seek legal fishing-ban areas but they did establish fishing-ban areas by autonomous bases. We briefly introduce the institutional history and features of Japanese coastal Fishery management, including the past decade’s major legislative developments. Japan still has a decentralized co-management system involving fishers and the government, and ca. 98% of Japanese fishers are artisanal. There are several successful cases of coastal fisheries management in Japan. However, offshore industrial fisheries have problems in Japan. We compare coastal fisheries co-management between Japan and Chile. We finally discuss the possibility of improvement for Japanese fisheries.
Darren Dennis - One of the best experts on this subject based on the ideXlab platform.
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Evaluating an empirical harvest control rule for the Torres Strait Panulirus ornatus tropical rock lobster Fishery
Bulletin of Marine Science, 2018Co-Authors: Éva Plagányi, Darren Dennis, Roy Deng, Trevor Hutton, Robert A. Campbell, Michael D. E. Haywood, Mark TonksAbstract:The Torres Strait tropical rock lobster, Panulirus ornatus (Fabricius, 1798), Fishery is a culturally and economically important Fishery. The Australian Commonwealth has an obligation under the Torres Strait Treaty to protect the traditional way of life and livelihood of Traditional Inhabitants, as well as promote employment opportunities for them. Management of the Fishery is complicated by the high natural recruitment variability, and diving surveys have been used for the past 28 yrs to monitor changes in the size of the recruiting population. Here, we describe development of an empirical harvest control rule (eHCR) to achieve defined biological, economic and sociocultural objectives for the lobster Fishery. A key principle is that Fishery managers, fishers, and key stakeholders utilize pre–agreed upon and pretested rules to adjust management recommendations given updates of data. The performance of eHCR alternative candidates is evaluated using four alternative operating models, with 200 stochastic replicates each and 800 total simulations, accounting for observation error and implementation uncertainty. The eHCR adjusts recommended biological catches relative to a recent average, based predominantly on the logarithm of the slopes of recent trends in the preseason recruiting lobster, with lower weighting accorded to trends in recently-settled lobster and catch per unit effort (CPUE) from two fishing sectors. In addition, a maximum catch limit of 1000 t is set. The eHCR formula thus uses recent trends in survey and CPUE information to implement rapid, but precautionary, short- term adjustments needed to effectively manage a highly variable Fishery.
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The quandary of quota management in the Torres Strait rock lobster Fishery
Fisheries Management and Ecology, 2013Co-Authors: I Van Putten, Éva Plagányi, Darren Dennis, Roy Deng, Trevor Hutton, Sean Pascoe, Tim SkewesAbstract:Islanders, commercial non-indigenous fishers and Papua New Guinea fishers share the tropical rock lobster Fishery, Panulirus ornatus (Fabricius) in Torres Strait. As the Fishery is in the process of moving from input to output controls, a pre-implementation understanding of indigenous fishers' perceptions of the potential impact of different quota management systems is gained. This study, based on workshops and interviews, considers the impact of competitive quota, community quota and a hybrid system with individually tradeable quota (ITQ), and broadens the current biological focus of fisheries management through consideration of economic, social and cultural aspects. The perceived quota system impact on indigenous lobster fishers largely mirrors the experience internationally, with unlimited access and self-determination considered most important. The heterogeneity of the indigenous sector increases the management complexity for this Fishery, but needs to be taken into consideration if unexpected consequences of the chosen quota management system are to be avoided.
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Linking physiological, population and socio-economic assessments of climate-change impacts on fisheries
Fisheries Research, 2013Co-Authors: Ana Norman-lópez, Tim Skewes, Elvira Poloczanska, Mark Gibbs, Éva Plagányi, Darren Dennis, Peter BaylissAbstract:Climate change is postulated to influence marine resources worldwide with consequent ramifications for the management of commercially important fisheries. There is a need to understand the likely impacts of climate change affecting the biology of fisheries at each of the different levels: (a) individual (reproductive potential, larval settlement, spatial distribution); (b) population (carrying capacity, productivity, spatial distribution); (c) multi-species (replacement of one Fishery by another) and (d) ecosystem (dependent predator species, shifts in community composition). When addressing these problems it is important to integrate information across a range of dimensions pertaining to the resource and stakeholders, using a combination of biological, economic and social research elements. This is necessary for a better understanding of the likely changes to catches and in turn the possible socio-economic implications. We assessed the impact and likelihood of a range of plausible climate impacts on a number of lobster life history parameters, using the Torres Strait tropical rock lobster Panulirus ornatus as a case study. The hypothesised high risk effects of climate change were implemented through modifications to the lobster stock assessment model. Projected catches and an input-output model of the Australian economy were used to determine the flow-on effects of climate-change impacts affecting this lobster Fishery. We highlight the potential of this combination of quantitative and qualitative approaches as a pragmatic first step to exploring climate-change impacts on a Fishery and summarise implications for management. Our results suggest that there may be positive as well as negative consequences. Our integrated methodology is a step towards linking the interrelation between different variables and Fishery productivity, and quantifying the resultant socio-economic effects to fishers, their communities and national economies. © 2012 .
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Assessing the impacts of trawling breeding lobsters (Panulirus ornatus) on the catch of the Torres Strait lobster Fishery shared between Australia and Papua New Guinea
New Zealand Journal of Marine and Freshwater Research, 2009Co-Authors: Yimin Ye, Darren DennisAbstract:Abstract The shared Torres Strait rock lobster (Panulirus ornatus) Fishery provides important income for commercial and traditional fishers in Australia and Papua New Guinea. The lobster stock is first fished in Torres Strait by divers from both countries and then becomes vulnerable to Australian prawn trawlers, followed by Papua New Guinea trawlers during its annual breeding migration. Lobster catch sharing arrangements are governed by the Torres Strait Treaty ratified in 1985, but the sequential trawling of breeding lobsters has been controlled by bilateral agreements. A trawl ban was implemented in 1984 in both countries to conserve the breeding stock, but some trawling has been conducted in the Gulf of Papua since then and there is renewed interest in Papua New Guinea to resume trawling. To evaluate the impact of trawling migratory breeding lobsters on the lobster Fishery, a model that combines a cohort depletion model with a stock recruitment relationship was developed in this study. The model showed...
