Relevant bibliographies by topics / Aquaculture and fisheries stock assessment

Academic literature on the topic 'Aquaculture and fisheries stock assessment'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Aquaculture and fisheries stock assessment"

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Kaczan, David J., and Pawan G. Patil. "Potential Development Contribution of Fisheries Reform: Evidence From Pakistan." Journal of Environment & Development 29, no. 3 (June 3, 2020): 275–305. http://dx.doi.org/10.1177/1070496520925878.

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Mismanagement threatens the productivity and sustainability of an increasing number of capture fisheries globally, hindering these resources’ ability to contribute to socioeconomic and environmental outcomes such as those embodied in the Sustainable Development Goals. Using Pakistan as a case study, we assess the contribution that improved management of Pakistan’s marine fisheries can make to development through economic growth, productivity, employment, and resource sustainability. Using a bioeconomic model based on a recent stock assessment, we find large projected benefits of fisheries reform relative to business as usual. However, projected production volume is not higher than current output, which is inflated by ongoing overfishing. Aquaculture is found to have potential for substantial and complementary socioeconomic benefits. We highlight how Pakistan’s fisheries mirror global trends of plateauing wild capture and falling productivity and suggest key policy changes and investments along the value chain that can underpin more productive and sustainable fisheries in this context.
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Stuart, Venetia, Trevor Platt, and Shubha Sathyendranath. "The future of fisheries science in management: a remote-sensing perspective." ICES Journal of Marine Science 68, no. 4 (January 17, 2011): 644–50. http://dx.doi.org/10.1093/icesjms/fsq200.

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Abstract Stuart, V., Platt, T., and Sathyendranath, S. 2011. The future of fisheries science in management: a remote-sensing perspective. – ICES Journal of Marine Science, 68: 644–650. Earth observation from satellites offers vast potential for fisheries applications, including management of marine resources, stock assessment, marine aquaculture, and fish harvesting. One of the most promising avenues for the use of satellite data for fisheries science in management lies in quantifying objectively the variables that result in large and small year classes of exploited stocks. The influence of fluctuations in the availability of food in the critical period of larval stages can be investigated through the application of ecological indicators describing the variability of the pelagic ecosystem at a given time and place. These indices can increase our understanding of the relationship between ecosystem factors and the recruitment of key species. Despite the many demonstration applications published to date, little use is being made of satellite data to support fisheries science in management. We discuss some of the obstacles that lie in the way of the operational use of satellite data and suggest actions that could facilitate its broader application.
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Lewin, Wolf-Christian, Harry Vincent Strehlow, Keno Ferter, Kieran Hyder, Jan Niemax, Jens-Peter Herrmann, and Marc Simon Weltersbach. "Estimating post-release mortality of European sea bass based on experimental angling." ICES Journal of Marine Science 75, no. 4 (January 17, 2018): 1483–95. http://dx.doi.org/10.1093/icesjms/fsx240.

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Abstract European sea bass (Dicentrarchus labrax) is an important target species for recreational and commercial fisheries. In recent years, the spawning stock biomass has declined markedly in some areas, and strict management measures have been introduced. However, the development of appropriate stock assessment and fisheries management has been hampered by a lack of information on post-release mortality. This study investigated post-release mortality of sea bass captured with common recreational fishing gear under experimental conditions in an aquaculture facility over 10 d. Three experiments investigated: (i) the effects of different bait types; (ii) the impact of prolonged air exposure; and (iii) the impact of deep hooking on post-release mortality. By combining the experimental results with country-specific information on sea bass angling practices, estimates of post-release mortality are provided for the northern sea bass stock. No mortality was observed for sea bass captured on artificial baits. The use of natural baits resulted in a mortality of 13.9% (95% CI = 4.7–29.5%), which was associated with deep hooking, hooking injuries, and prolonged air exposure. The use of artificial baits and short air exposure (≤30 s) increased survival probability, whereas deep hooking resulted in 76.5% (95% CI = 50.0–93.2%) mortality. Depending on country-specific angling practices, post-release mortality estimates ranged from 2.8% to 9.1% (mean = 5.0%, 95% CI = 1.7–14.4%) for northern sea bass. Despite these relatively low mortality estimates, post-release mortality should be considered in stock assessments as its cumulative impact may be high. Moreover, post-release mortality can be reduced by implementing species-specific best practice guidelines.
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Garcia, Serge M., and Richard J. R. Grainger. "Gloom and doom? The future of marine capture fisheries." Philosophical Transactions of the Royal Society B: Biological Sciences 360, no. 1453 (January 29, 2005): 21–46. http://dx.doi.org/10.1098/rstb.2004.1580.

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Predicting global fisheries is a high–order challenge but predictions have been made and updates are needed. Past forecasts, present trends and perspectives of key parameters of the fisheries—including potential harvest, state of stocks, supply and demand, trade, fishing technology and governance—are reviewed in detail, as the basis for new forecasts and forecasting performance assessment. The future of marine capture fisheries will be conditioned by the political, social and economic evolution of the world within which they operate. Consequently, recent global scenarios for the future world are reviewed, with the emphasis on fisheries. The main driving forces (e.g. global economic development, demography, environment, public awareness, information technology, energy, ethics) including aquaculture are described. Outlooks are provided for each aspect of the fishery sector. The conclusion puts these elements in perspective and offers the authors' personal interpretation of the possible future pathway of fisheries, the uncertainty about it and the still unanswered questions of direct relevance in shaping that future.
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Hvingel, Carsten, Bernard Sainte-Marie, and Gordon H. Kruse. "Cold-water shellfish as harvestable resources and important ecosystem players." ICES Journal of Marine Science 78, no. 2 (February 7, 2021): 479–90. http://dx.doi.org/10.1093/icesjms/fsab005.

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Abstract The symposium, Shellfish—Resources and Invaders of the North, took place 5–7 November 2019 in Tromsø, Norway. Approximately 110 participants presented and discussed 60 talks and 25 posters. Of these, ten articles are published in this symposium issue. The goal of this symposium was to discuss the role of shellfish, both as harvestable resources and as important ecosystem players in northern hemisphere cold marine environments. To provide perspective for the symposium, the development of four major crustacean fisheries (northern shrimp, snow crab, Homarus, Norway lobster) are reviewed. Our review showed that landings of all these fisheries are still in a state of flux due to inherent population dynamics, fishing, and climate change. The talks and posters covered a broad range of state-of-the-art bioecological knowledge and present challenges in the assessment and management of the most ecologically and/or commercially important cold-water shellfish species belonging to the phyla Arthropoda, Mollusca, and Echinodermata. Various alternative harvesting and management techniques were presented along with perspectives for shellfish aquaculture. Methods and models for stock assessment were thoroughly covered as well as the ecological role of shellfish, their population dynamics, new insights into their biology and genetics, and their changing distribution and significance as invasive species.
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Talbot, S. Elizabeth, Stephen Widdicombe, Chris Hauton, and Jorn Bruggeman. "Adapting the dynamic energy budget (DEB) approach to include non-continuous growth (moulting) and provide better predictions of biological performance in crustaceans." ICES Journal of Marine Science 76, no. 1 (November 22, 2018): 192–205. http://dx.doi.org/10.1093/icesjms/fsy164.

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Abstract Dynamic energy budget (DEB) theory offers a comprehensive framework for understanding the overall physiological performance (growth, development, respiration, reproduction, etc.) of an organism over the course of its life cycle. We present here a simplified DEB model for the swimming crab Liocarcinus depurator. To the best of our knowledge, this is the first to be presented for this species. Most applications of the standard DEB model assume continuous growth in all size metrics (length, wet mass, carbon content) of the modelled species. However, in crustaceans growth, measured as an increase of carapace length/width, occurs periodically via moult. To account for this, we have extended the model to track the continuous increase in carbon mass as well as the episodic increase in physical size. Model predictions were consistent with the patterns in the observed data, predicting both the moult increment and the intermoult period of an individual. In addition to presenting the model itself, we also make recommendations for further development, and evaluate the potential applications of such a model, both at the individual level (e.g. aquaculture) and as a potential tool for population level dynamics (e.g. fisheries stock assessment).
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Ndjamba, Tchimanda Simeão Imbo, Miguel Araya, and Marcelo Enrique Oliva. "Otolith Weight as an Estimator of the Age of Seriola lalandi Valenciennes, 1833 (Carangidae), in the Southeastern Pacific." Animals 12, no. 13 (June 26, 2022): 1640. http://dx.doi.org/10.3390/ani12131640.

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The age and growth of fish populations is a critical issue for stock assessment, population dynamics and fishery management. Spawner biomass, mortality, growth, recruitment and age at maturity can be misconstrued if the age estimator is inaccurate. Age can be estimated by annuli count, but this requires expertise and is expensive. Otolith weight (OW) is a good indicator of how long a fish has lived, because OW increases during an individual’s life. Seriola lalandi is a migratory fish and is an important resource for local fishermen in northern Chile. Aspects of its biology, i.e., age and growth, remain unknown, at least for the population annually arriving in northern Chile. Fish of a known age (n = 105; from 5.5 to 25.7 cm in FL) from yellowtail aquaculture facilities at Universidad de Antofagasta allowed us to estimate the growth rate of OW, and fish obtained from local fishermen (n = 71; from 37.9 to 109 cm in FL) allowed us to estimate the age and growth of S. lalandi from the analysis of OW, without the need for calibration. The following four models were fitted with the known ages and fork lengths: the von Bertalanffy growth function, the Gompertz and logistic models and the seasonalized von Bertalanffy growth function. The latter model showed the best adjustment (according to the Akaike information criterion) with the following parameters: L∞, 98.58 cm.; K, 0.59; t0, 0.07; ts, 0.84; and C, 0.97.
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Conquest, Loveday L. "Stock Assessment in Inland Fisheries." Transactions of the American Fisheries Society 127, no. 1 (January 1998): 153–54. http://dx.doi.org/10.1577/1548-8659(199801)127:1<0153:sditsc>2.0.co;2.

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Medley, P. A., G. Gaudian, and S. Wells. "Coral reef fisheries stock assessment." Reviews in Fish Biology and Fisheries 3, no. 3 (September 1993): 242–85. http://dx.doi.org/10.1007/bf00043930.

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Fisch, Nicholas, Angela Collins, and Edward V. Camp. "What is stock assessment?" EDIS 2021, no. 2 (May 4, 2021): 5. http://dx.doi.org/10.32473/edis-fa232-2021.

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Whether you’re an angler, diver, conservationist, or just interested in fisheries, you’ve likely heard the term “stock assessment” before. What are stock assessments? How do they work? How do they inform management decisions? This publication provides information to the public and people serving in natural resource management agencies and working in outreach and Extension to show how fisheries management decisions are made.
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Dissertations / Theses on the topic "Aquaculture and fisheries stock assessment"

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Deng, Xiaoying. "A comparative analysis of fish stock assessment methods, spatial-temporal versus VPA." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ57106.pdf.

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Ailloud, Lisa Elma. "Improving Stock Assessments and Management Advice for Bluefin Tunas and Other Highly Migratory Species." W&M ScholarWorks, 2018. https://scholarworks.wm.edu/etd/1550153643.

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For years bluefin tuna has been the poster child for overfishing and poor management. However, recent improvements in data collection, catch monitoring and international cooperation are providing an opportunity to reverse the perception of a fishery that is doomed to collapse. Stock assessments are conducted routinely to monitor the abundance and productivity of exploited fish stocks so managers can determine how many fish can be sustainably harvested each year. Should a stock be declared overfished or under-going overfishing, the science behind stock assessments also equip managers with the knowledge necessary to make decisions about what short-term and long-term management measures should be taken to help reverse these trends. in that light, the goal of my research has been to use newly available age data to improve the quality and reliability of assessments for Atlantic bluefin tuna by reducing uncertainty about the data and methods used to infer growth and age composition. A secondary goal has been to provide managers with the knowledge necessary to implement effective stock rebuilding programs for Pacific bluefin tuna. Chapter 2 is focused on cohort slicing, a method routinely used in the Atlantic bluefin tuna assessment to estimate catch-at-age from catch-at-size information. This chapter explores how errors in cohort sliced catch-at-age data can bias estimates of total mortality rate derived from catch curve analysis. Recommendations are provided concerning the appropriate mortality estimator and plus group to use depending on the parameters characterizing the stock. Chapter 3 provides updated growth estimates for western Atlantic bluefin tuna, which were adopted in 2017 as the basis for defining growth in the assessment. Chapter 4 provides an overview of the theory behind age-length keys with particular emphasis on the assumptions that govern each method and provides notes of caution concerning their applications to real data. Chapter 5 evaluates through simulation the relative performance of different methods for estimating age composition of western Atlantic bluefin tuna catches and applies the best performing technique, the combined forward-inverse age-length key, to actual western Atlantic bluefin tuna data. Chapter 6 moves over to the Pacific and focuses on evaluating the potential impacts of different minimum size regulations on the stock of Pacific bluefin tuna and explores ways in which to minimize short-term pain to the industry while still achieving long-term yield and conservation goals. Overall, this work has contributed major improvements to the stock assessment process of Atlantic bluefin tuna and implications of this work resonate beyond the bluefin tuna world to other highly migratory species faced with similar problems.
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Poloczanska, Elvira Severina. "Modelling the Shetland sandeel stock." Thesis, University of Glasgow, 2001. http://theses.gla.ac.uk/4022/.

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Young sandeels (0- and 1-group fish) form a substantial part of the total stock biomass at Shetland. As well as forming the basis for a local fishery at Shetland, they are also an extremely important prey item for many seabird species which breed around Shetland coasts. Improving our understanding of recruitment dynamics is vital for managing the Shetland fishery whilst minimizing adverse affects on breeding seabirds. Therefore, this thesis has concentrated on analyzing recruitment patterns and developing models to simulate hypothetical recruitment scenarios. Various models were developed and/or parameterised to simulate recruitment. Firstly, as there appeared to be no clearly defined stock-recruit relationship, time series models were applied to expose and improve understanding of patterns in the data. However, the relationship between stock and recruitment cannot be ignored if spawning stock biomass changes through exploitation. Therefore, Shepherd (1982) and Ricker (1954, 1975) stock-recruit models are parameterised using bootstrap analysis. For the Shepherd model, which is the more complex of the two, bootstrap analysis identified models which could be considered as "constant recruitment" models - that is no influence of spawning stock biomass on recruitment. It was found that four very low recruit years, which occurred in the late 1980s when spawning stock biomass was generally high or moderate, were strongly influencing model fit. This prompted the question: are these low recruit years typical of the range of recruitment for the given spawning stock biomasses or can they be considered outliers? In the face of uncertainty (although there is no biological reasoning) these data points were removed and the stock-recruit models re-parameterised. This enabled curves with 95% confidence intervals to be parameterised for both stock-recruit models (Shepherd & Ricker). The autoregressive model parameterised earlier was combined with the stock-recruit models so recruitment in any year was expressed as a function of SSB and of recruitment in the previous year.
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Bakhshi, Andisheh. "Length-structured approach to fisheries stock assessment." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=28512.

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Modern fishing fleets have the capacity to over-exploit fish stocks. Inaccurate assessments could overestimate the stock size and as a result Total Allowable Catches (TAC) are set too high for sustainable stock conservation. Fisheries management need robust and reliable stock assessments to ensure that the species and environmental effect of fishing is sustainable. Since the demand for ecosystem based approaches to management has increased, the needs for improved estimates of un-assessed abundance have risen. Managers simply need to know how many fish left in the see and how much to limit the fishermen to fish to have sustainable fisheries. Therefore, accurate assessment of the market as well as by-catch stocks and records of true landings and discards are critical aspects of the scientific advice to the fisheries managers to accurately set TACs. Here, we consider the marine species that are left un-assessed. That is because they cannot be assessed by the existing methods. We therefore sought to fill the key gap with this matter. This thesis has five key elements. First we reviewed the stock assessment method with the emphasis on the length-structured models. Second, we produced a population model (so called survey-landings model) to make the use of survey frequency data extracted from International Bottom Trawl Survey and total annual landed biomass from commercial reports. Third, within a twin-experiment context and sensitivity analysis the model was assessed for accuracy and robustness in variability in initial parameter values and observational noise. Forth, applying the survey-landings model the population dynamics of the North Sea haddock was assessed and the results were compared with the International Council for Exploitation of the Sea assessment. Fifth, after the model proved to be reliable it is used as an alternative for age- or catch-at-length model, the population of the North Sea grey gurnards were modelled with confidence. This model enabled un-assessed species such as grey gurnards to be modelled and assessed for the first time.
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Aubert, Hernan 1963. "Assessment of the potential for culture of the Chinese clam (Chione gnidia) in the estuary of La Cruz, Sonora, Mexico." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/278727.

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Growth and mortality of the chinese clam (chione gnidia) were examined in the Estuary of La Cruz, Sonora, Mexico from 1987 to 1989. Clams were reared in trays in two habitats of the Estuary of La Cruz, the pool and the canal, where four experiments were carried out. In experiment 1 growth and mortality under two densities and two environments was assessed. Experiment 2 yielded information on growth and mortality of clams growing on four different substrates and at two densities. Experiment 3 assessed growth and mortality in high density conditions, and experiment 4 assessed growth after a period of growth stagnation. In all cases, highly significant differences in growth and mortality were observed between environments. The pool was found to be the place where higher total growth and least mortality occurred. However, the sizes achieved by clams in the pool suggest that the Estuary of La Cruz is not a suitable environment for the cultivation of this clam, and that the introduction of C. gnidia in this area is not feasible under present habitat conditions.
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Nam, Jong-Oh. "Korean fisheries : policies, stock assessment and compliance issues /." View online ; access limited to URI, 2007. http://0-digitalcommons.uri.edu.helin.uri.edu/dissertations/AAI3298374.

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Rahman, Md Khalilur. "Fish-based assessment of ecological health of English lowland rivers." Thesis, University of Hull, 2001. http://hydra.hull.ac.uk/resources/hull:11842.

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Riverine fisheries in England are under pressure from a variety of activities, including increasing intensification of land-use, urbanisation, rising demands for water abstraction, pollution, proliferation of exotic species, climate change and recreational activities. As a result, the integrity of English rivers has changed. In this study, an attempt was made to measure the ecological health of 22 English lowland rivers from the Thames, Trent and Yorkshire Ouse catchments using a variety of tools. The objective was to modify the Index of Biotic Integrity (IBI) for use on English lowland rivers and compare it with existing indices. A number of diversity indices, Margalef (DMg), Simpson (Dsm) and ShannonWiener (H') were used to evaluate the status of fisheries in the study rivers. The Abundance / Biomass (ABC) method and computer-based multivariate analyses, UPGMA, TWINS PAN, DECORANA, were also used to evaluate the status of fish communities. In addition to these indices, the ABC method and multivariate analyses, the IBI, a multimetric index was also used to evaluate the ecological health of study rivers. The IBI is based on structural and functional attributes of fish communities and is capable of evaluating health and condition of an aquatic ecosystem. The IBI requires a reference condition with which to compare the output. In English rivers, no pristine (reference) sites were considered available, consequently best available data were used to develop a reference condition. In this study, the IBI was modified from Karr (1981), which was based on 12 metrics (community characteristics) of fish assemblages. For the study rivers, 15 metrics which described the status of the fish communities were selected to calculate the IBI. Each metric was scored on a simple scale from 0 (absence) to 5 (high quality). The sum of all the metrics (range 0 - 75) was used to assign sites to qualitative classes of biotic integrity. Six integrity classes on a continuous scale were chosen with the following class boundaries: Excellent (56 - 75), Good (42 - 55), Fair (28 - 41), Poor (16 - 27), Very Poor (1 - 15) and No Fish (0). In the study rivers, the DMg, Dsm and H' indices were unable to measure anthropogenic impacts on fish communities as all these indices were based on structural properties of fish communities. These indices also failed to take account of the presence of juveniles in the fish community in a river. Moreover, these indices were influenced by dominant species abundance and sampling strategies, giving an inaccurate assessment of the status of the fisheries. The ABC method was better at evaluating fish communities than diversity indices as the method considered fish abundance and biomass. However, the method did not include functional components of the fish community and was over influenced by juvenile fishes. Consequently, the ABC method was not considered a good indicator of ecosystem health based on fish assemblages. The UPGMA, TWINSPAN and DECORANA analyses, successfully grouped and separated river reaches with rich or poor fish stocks. These analyses however, did not take into account the functional attributes of the fish communities and were not sufficient to explain the status of a fishery without support from other indices. The IBI assessed the ecological health of the middle and lower reaches of the study rivers more accurately than the other diversity indices, ABC method and multivariate analyses. The selected IBI metrics were able to evaluate many perturbations and disturbances as the metrics represented both structural and functional attributes of fish communities. The DMg, Dsm, H', ABC, UPGMA, TWINSPAN and DECORANA were designed to highlight a specific attribute and lost information during calculation but the IBI included a greater variety of information and produced an appropriate index. Spearman's rank correlation indicated the IBI outputs were more similar to diversity indices than other measures, as significant relationships were found between the IBI and DMg, the IBI and Dsm, and the IBI and H' at a = 0.01 level. Significant relationships were probably due to the use of fish density and abundance in the models. However, this did not mean that all diversity indices and the IBI were similar in measuring ecological conditions of a river, rather it was probably numerical similarity. No significant relationship was found between the IBI and ABC, as the ABC index was a ratio of abundance and biomass while the IBI used absolute values of biomass and abundance separately. All the diversity indices, ABC method and multivariate analyses mentioned reinforced the view that the IBI developed in this study was an appropriate index at evaluating ecological health of the middle and lower reaches of the study rivers. The IBI, however, failed to predict the quality of the fisheries in headwater streams because of the exclusion of salmonid species, minor species and general low species diversity found in these zones. Consequently, it was identified that reference conditions and metrics chosen for the middle and lower reaches of the study rivers were not appropriate to assess the ecological health of headwaters. The existing monitoring programmes of the Environment Agency (EA) for fishery data collection, were considered appropriate for calculating IBIs. Sampling strategies of the EA, i.e. daytime, electric fishing both in summer and winter periods irrespective of lunar cycle and breeding season were also considered acceptable to calculate the IBI. Further research was recommended to test the IBI on a wide range of rivers to assess whether the IBI is appropriate for assessing ecological health of middle and lower reaches of rivers in all regions of the UK. Separate IBIs for headwaters, still waters and estuaries were proposed as these zones / waterbodies have different fish communities. Investigation should be directed at developing a simplified IBI using other cost-effective data sources if suitable resources are not available. It is also recommended that the possibility of including the IBI in wider aquatic resource monitoring programmes (e.g. WFD) be investigated. It is also recommended that the possibility of using the IBI to detect change in the pre and post implementation periods of any management action or anthropogenic activity be investigated. Research is also needed to integrate the IBI with other bioassessment methods (e.g. Habitat index, Diatom index, Microinvertebrate index, Chemical index and GQA index). For more effective application and understanding, the IBI may be built into a GIS (Geographical Information System) environment. It is suggested that a suitable computer package be developed to simplify calculations of the IBI. The interpretation should however, be carried out by the fishery manager or scientist.
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Ebil, Syazana. "Assessment of demersal fishery resources in Brunei Darussalam." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/57704/.

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A problem commonly encountered in stock assessments of tropical marine resources in developing countries is data paucity, which invariably results from the lack of both human and economic capacity within the government to implement and maintain programmes for data collection and analysis. With special reference to the demersal fishery of Brunei Darussalam, this thesis examines approaches for extracting useful information from data-poor fisheries to assess the state of resources and inform fishery management actions. By using official fishery statistics, augmented by local ecological knowledge (LEK) obtained from fishers engaged in either the large-scale (LS) or small-scale (SS) fisheries in Brunei, changes in demersal fishery resources over the years were assessed. The sustainability of Brunei’s demersal capture fishery was evaluated in the face of its ongoing development and climate change. Using trophodynamic indicators such as mean trophic level (MTL), Fishing-in- Balance (FiB), trophic spectra (TS) and community structure analyses, LS fishery catches of Brunei between 2000 and 2009 revealed a deteriorating state of the coastal demersal ecosystem. Closer examination of the abundance of overall demersal finfish stocks, using the Catch-Per-Unit-Effort (CPUE) index – standardised for other factors not related to abundance – indicated a declining trend, even when total catches remained stationary, although trends in abundance of the different demersal fish families varied. This rapid significant change in recent years is further supported by fishers’ LEK on relative abundance of Brunei marine resources. The study on LEK has also revealed the ‘shifting baseline syndrome’ (SBS) among currently active fishers and their exploited populations, a phenomenon not previously reported for Brunei fisheries. Findings from the study are synthesised with other information, where a number of key issues and policy options are discussed, and recommendations for the management of the fishery are made. This thesis demonstrates that researchers in data-poor fisheries can utilise different assessment tools, given the resources at their disposal, to assist in the management of marine resources.
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Huynh, Quang C. "Extensions and Applications of Mean Length Mortality Estimators for Assessment of Data-Limited Fisheries." W&M ScholarWorks, 2017. https://scholarworks.wm.edu/etd/1516639583.

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For data-limited fisheries, length-based mortality estimators are attractive as alternatives to age-structured models due to the simpler data requirements and ease of use of the former. This dissertation develops new extensions of mean length-based mortality estimators and applies them to federally-managed stocks in the southeastern U.S. and U.S. Caribbean. Chapter 1 presents a review of length-based methods from the literature. Common themes regarding the methodology, assumptions, and diagnostics in these length-based methods are discussed. In Chapter 2, a simulation study evaluates the performance of the length-converted catch curve (LCCC), Beverton-Holt equation (BHE), and Length Based-Spawner Potential Ratio (LB-SPR) over a range of scenarios. Although the LCCC and BHE are older methods than LB-SPR, the former outperformed LB-SPR in many scenarios in the simulation. Overall, it was found that the three length-based mortality estimators are less likely to perform well for low M/K stocks (M/K is the ratio of the natural mortality rate and the von Bertalanffy growth parameter; this ratio describes different life history strategies of exploited fish and invertebrate populations), while various decision rules for truncating the length data for the LCCC and BHE were less influential. In Chapter 3, a multi-stock model is developed for the non-equilibrium mean length-based mortality estimator and then applied to the deepwater snapper complex in Puerto Rico. The multispecies estimator evaluates synchrony in changes to the mean length of multiple species in a complex. Synchrony in mortality can reduce the number of estimated parameters and borrows information from more informative species to lesser sampled species in the model. In Chapter 4, a new method is developed to estimate mortality from both mean lengths and catch rates (MLCR), which is an extension of the mean length-only (ML) model. to do so, the corresponding behavior for the catch rate following step-wise changes in mortality is derived. Application of both models to Puerto Rico mutton snapper shows that the MLCR model can provide more information to support a more complex mortality history with the two data types compared to the ML model. In Chapter 5, a suite of mean length-based mortality estimators is applied to six stocks (four in the Gulf of Mexico and two in the U.S. Atlantic) recently assessed with age-structured models. There was general agreement in historical mortality trends between the age-structured models and the mean length-based methods, although there were some discrepancies which are discussed. All models also agreed on the overfishing status in the terminal year of the assessment of the six stocks considered here when the mortality rates were compared relative to reference points. This dissertation develops new length-based assessment methods which consider multiple sources of data. The review guides prospective users on potential choices for assessment with length-based methods. Issues and diagnostics associated with the methods are also discussed in the review and highlighted in the example applications.
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Al-Oufi, Hamed Said. "Social and economic factors influencing the emergence of collective action in a traditional fishery of Oman : an empirical assessment of three coastal fishing towns in south Al-Batinah." Thesis, University of Hull, 1999. http://hydra.hull.ac.uk/resources/hull:3871.

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Overexploitation of many fish stocks underlines the need for more effort directed towards stock management so that the sustainability of resources is assured. To avert the tragic consequences of overfishing in coastal waters, a growing body of theoretical and empirical research provides evidence in support of cooperation among resource users to manage their commons. This study aimed to investigate the factors that contribute to the emergence and evolution of collective action in fishermen's communities to manage their coastal fish resources in South Al-Batinah, Sultanate of Oman. The study emphasises the importance of a collective action approach to fish resource management with examples from three fishing towns.In order to understand why fishermen choose to participate (or not to participate) in local collective action to manage fish resources, the researcher focuses on six main sets of issues that influence fishermen's decisions: economic factors; awareness of resource exploitation problems; institutional rules in use; social identity, group size and heterogeneity among resource users. Social and demographic factors as well as vessel configuration were also considered.Data collection for the study was carried out using three methods: questionnaire, semi-structured interview and observations of fishermen's activities. Statistical reports and other research papers carried out in Oman were also reviewed. The study found that there is a management institution that governs the fishing activities of the fishermen in the study area. Fishermen in the area inherited an indigenous management institution, which was established hundreds of years ago. It was also found that fishermen were very aware of the resource exploitation problems. High awareness of the resource exploitation problems coupled with high interdependence among users might induce them to work collectively to mitigate harm to their long-term welfare.The results of testing a number of hypotheses indicated that among the reasons which may influence collective action, are high economic dependence on the fishery,individuals' social identity as fishermen, awareness of the resources exploitation problems, risk aversion and heterogeneity (differences in objectives and interests).The study findings indicated that individuals using common resources are faced by various "assurance" and "chicken" problems. In both the PD game and the Assurance game, the preferred outcome is mutual cooperation. Whereas the predicted outcome of the former is defection, the latter suggests the possibility that the preferred outcome (i.e., cooperation) will occur, because individuals' decisions in the commons are influenced by a complex set of factors, rather than strictly materialistic self-interest. The analysis presented in this study examined several of those factors for their influence on individual behaviour. The findings of this study strongly suggest that the presence of local management institutions to coordinate the fishermen's activities in the study area is the key factor in avoiding the worst outcome (universal defection). The game structure has been changed from a Prisoner's dilemma to a Privileged game or a game of Chicken where the benefits from cooperation are maximized. It is the role of the institutions to determine how the cost of providing the public goods might be shared among participants.
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Books on the topic "Aquaculture and fisheries stock assessment"

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Gibert, Anne, Franck Magron, and Aymeric Desumont. SPC Coastal & Oceanic Fisheries Programmes: Digital library 2006. 2nd ed. [Suva, Fiji]: Secretariat of the Pacific Community, 2006.

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F, Gallucci Vincent, ed. Stock assessment: Quantitative methods and applications for small-scale fisheries. Boca Raton: CRC/Lewis Publishers, 1996.

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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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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.

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Workshop on Incorporating Uncertainty into Fishery Models (1999 Jekyll Island, Ga.). Incorporating uncertainty into fishery models: Proceedings of the Workshop Incorporating Uncertainty into Fishery Models held at Jekyll Island, Georgia, USA, 28-29 June 1999. Bethesda, MD: American Fisheries Society, 2002.

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Jakobsen, Tore. Fish reproductive biology: Implications for assessment and management. Chichester, West Sussex, U.K: Wiley-Blackwell, 2016.

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Technical Consultation on Stock Assessment in the Eastern Mediterranean (2nd 1988 Athens, Greece). Report of the Second Technical Consultation on Stock Assessment in the Eastern Mediterranean, Athens, Greece, 28 March-1 April 1988. Rome: Food and Agriculture Organization of the United Nations, 1989.

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Hilborn, Ray, and Carl J. Walters. Quantitative Fisheries Stock Assessment. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3598-0.

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G, Cowx I., ed. Stock assessment in inland fisheries. Oxford, [England]: Fishing News Books, 1996.

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Rakocy, James. Assessment of aquaculture in the eastern Caribbean--: A pilot study of Antigua, Barbados, Dominica, Montserrat, St. Lucia, and St. Vincent. [St. Croix, U.S.V.I.]: College of the Virgin Islands, Eastern Caribbean Center, 1986.

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Book chapters on the topic "Aquaculture and fisheries stock assessment"

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Kuparinen, Anna, and Hannu Lehtonen. "Northern pike commercial fisheries, stock assessment and aquaculture." In Biology and Ecology of Pike, 337–55. Boca Raton, FL : CRC Press, 2017. | “A Science Publishers book.”: CRC Press, 2018. http://dx.doi.org/10.1201/9781315119076-16.

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Hiramatsu, Kazuhiko. "Fisheries Stock Assessment." In Fish Population Dynamics, Monitoring, and Management, 159–76. Tokyo: Springer Japan, 2018. http://dx.doi.org/10.1007/978-4-431-56621-2_9.

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King, Michael. "Stock Assessment." In Fisheries Biology, Assessment and Management, 239–72. Oxford, UK: Blackwell Publishing Ltd,., 2013. http://dx.doi.org/10.1002/9781118688038.ch5.

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Hilborn, Ray, and Carl J. Walters. "Stock and Recruitment." In Quantitative Fisheries Stock Assessment, 241–96. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3598-0_7.

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Hilborn, Ray, and Carl J. Walters. "Objectives of Fisheries Management." In Quantitative Fisheries Stock Assessment, 22–43. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3598-0_2.

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Hilborn, Ray, and Carl J. Walters. "Role of Stock Assessment in Fisheries Management." In Quantitative Fisheries Stock Assessment, 3–21. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3598-0_1.

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Hilborn, Ray, and Carl J. Walters. "Virtual Population Analysis." In Quantitative Fisheries Stock Assessment, 349–68. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3598-0_10.

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Hilborn, Ray, and Carl J. Walters. "Statistical Catch-at-Age Methods." In Quantitative Fisheries Stock Assessment, 369–90. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3598-0_11.

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Hilborn, Ray, and Carl J. Walters. "Depletion Estimates of Population Size and Turnover." In Quantitative Fisheries Stock Assessment, 391–409. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3598-0_12.

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Hilborn, Ray, and Carl J. Walters. "Analysis of Body Size and Growth Data." In Quantitative Fisheries Stock Assessment, 410–33. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3598-0_13.

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Conference papers on the topic "Aquaculture and fisheries stock assessment"

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Das, A., and S. P. Biswas. "Water Quality Assessment Based on Fish and Macroinverbrate Diversity Indices of River Mara Bharali in Assam, India." In International Conference on Fisheries and Aquaculture. The International Institute of Knowledge Management, 2020. http://dx.doi.org/10.17501/23861282.2019.5101.

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A.V., Vorobieva, Golovinov I.V., Alimova A.Sh, Gaidamachenko V.N., and Nebesikhina N.A. "ASSESSMENT OF THE GENETIC DIVERSITY OF THE RUSSIAN STURGEON BROOD STOCK OF THE DONSKOY STURGEON PLANT BY MICROSATELLITE NUCLEAR MARKERS." In II INTERNATIONAL SCIENTIFIC AND PRACTICAL CONFERENCE "DEVELOPMENT AND MODERN PROBLEMS OF AQUACULTURE" ("AQUACULTURE 2022" CONFERENCE). DSTU-Print, 2022. http://dx.doi.org/10.23947/aquaculture.2022.41-43.

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The article presents a study of the genetic diversity of the Russian sturgeon (Acipenser gueldenstaedtii) of the brood stock (RMS) of the Donskoy sturgeon hatchery (DOZ) using the analysis of microsatellite nuclear markers. In the course of the study, a general decrease in the heterozygosity of the population for four of the five loci studied was established, and in the study of the RMS population over the past two years, rare groups of alleles were identified that were not found in the sample for 2014. The data obtained can be used by the plant when drawing up crossbreeding schemes to preserve the overall allelic (genetic) diversity of the population.
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Asbjørnslett, Bjørn Egil, Per Olaf Brett, Benjamin Lagemann, and Stein Ove Erikstad. "Educating the Next Generation Marine Systems Design Engineer – The NTNU Perspective." In SNAME 14th International Marine Design Conference. SNAME, 2022. http://dx.doi.org/10.5957/imdc-2022-267.

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At the Norwegian University for Science and Technology (NTNU) in Trondheim we have a long tradition for education Master of Science candidates in naval architecture and marine technology for both the Norwegian and global maritime industry. Currently we graduate approximately 120 MSc candidates each year. Until now, they have typically been employed by the three major export industries in Norway, being shipping and shipbuilding, offshore oil and gas, and fisheries and aquaculture, though increasingly offshore renewable energy has become a major employer. In this paper we will report on how we plan to further develop our study programme, both marine technology in general, and marine systems design in particular. It is our experience from previous IMDC conferences that sharing and discussing this topic among peer educational institutions in this field is important for both new ideas and insights as well as feedback and quality assessment We believe there are four major forces that will have the highest influence on the marine technology study programmes: That sustainability will be a key driver in all aspects of marine systems design towards 2050, and that we must equip future MSc graduates with both the fundamental (systems) knowledge as well as quantitative tools, models and methods on a level far beyond where we are today. That all aspects of digitalization will continue to be a major development force. One aspect will be the products and systems to be designed and operated in an industry where digital twins, cyber-physical systems, remote and autonomous operations and zetabytes of data are becoming household concepts. Another aspect is the tools, models and methods applied for analysis, optimization, visualization and communication where we in the educational sector have experienced a substantial leap under and in the wake of the Corona pandemic. That creativity, student engagement and innovation will play a more central role in engineering programmes. The CDIO (Conceive, Design, Implement, Operate) education framework adopted by many universities reflects this, and CDIO has is central in the overall educational strategy at NTNU. That a systems perspective with corresponding models, methods and tools will be even more important for the next generation naval architects. A relevant illustration of this is the recognition that the 2050 IMO targets for emission reductions cannot be resolved by singular efforts such as improved hull forms or new engine technologies, but will require the concerted contribution from many initiatives related to the ship itself, its concepts of operation, as well as the operating context at large including fuel infrastructure, technology developments, regulations and economic incentives. Without systems competencies our graduates will fail to meet the expectations from both the maritime industry as well as the society at large. In our proposed paper we will present both the changes that we have already implemented towards meeting these challenges and the results we have obtained so far, as well as outlining our future strategy for continued improvement.
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Reports on the topic "Aquaculture and fisheries stock assessment"

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Hambrey, John, Paul Medley, Sue Evans, Crick Carlton, Carole Beaumont, and Tristan Southall. Evidence gathering in support of sustainable Scottish inshore fisheries: work package (6) final report: integrating stock management considerations with market opportunities in the Scottish inshore fisheries sector – a pilot study. Marine Alliance for Science and Technology for Scotland (MASTS), 2015. http://dx.doi.org/10.15664/10023.24677.

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In June 2014, Hambrey Consulting successfully responded to a call for tenders for research to undertake a pilot assessment of the potential economic and associated benefits of establishing minimum market landing size (MMLS) in excess of minimum legal landing size (MLS) for shellfish; and to evaluate if such an intervention could be undertaken at a regional level. The project was originally conceived as including 3 case studies, but the scope of the research led us to focus mainly on the trawl and creel fishery for Nephrops prosecuted by the fleet based in Skye and SW Ross. The basic framework for the assessment approach was to: Develop an economic profile of the case study area and its fishing fleet; Review and synthesise existing data on size profile of the catch, the factors that affect size, including costs associated with individual (vessel) actions or strategies to increase the size profile of the catch; Analyse market and market trends, and the prices for different sizes of product; Develop economic models of representative fishing enterprises, taking account of the relationships between costs and returns and the size profile of the catch; Use plausible scenarios to explore likely short term economic consequences of any changes in MMLS; Use yield and utility per recruit analysis to explore possible yield benefits associated with increased MMLS.
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Mouat, Beth, Mike Bergh, Richard Shelmerdine, and Kobus Leach. Scottish Inshore Fisheries Integrated Data System (SIFIDS): Work package 1 final report: Review and optimisation of shellfish data collection strategies for Scottish inshore waters. Edited by Hannah Ladd-Jones and Mark James. Marine Alliance for Science and Technology for Scotland (MASTS), 2018. http://dx.doi.org/10.15664/10023.23379.

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[Extract from Executive Summary] The collection of additional data to facilitate fisheries management has been identified as a priority at the national level via the Scottish Inshore Fisheries Strategy, and at the local level in the management plans of Regional Inshore Fisheries Groups. Data collection implemented by industry offers a potentially cost effective means by which to provide additional information to enhance current stock assessment programmes, and to produce empirical indicators to inform fisheries management. The fundamental driver for data collection should be the purpose for which it is required; however, the regionalisation of fisheries management and increased, and often competing, demands, on our marine space mean that there are many potential uses for industry derived data. This report presents the findings of a single work package in the wider prototypic Scottish Inshore Fisheries Integrated Data System (SIFIDS) project; looking at ways in which inshore fisheries data collection can be improved on. The propose of this work package was to review and evaluate current inshore (shellfish) fisheries data collection and stock assessments in order to determine where it might be possible for industry derived data collection to provide a positive contribution. For the purposes of this work package the focus was limited to brown crab, lobsters, and scallops.
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Bates, C. Richards, Melanie Chocholek, Clive Fox, John Howe, and Neil Jones. Scottish Inshore Fisheries Integrated Data System (SIFIDS): Work package (3) final report development of a novel, automated mechanism for the collection of scallop stock data. Edited by Mark James and Hannah Ladd-Jones. Marine Alliance for Science and Technology for Scotland (MASTS), 2019. http://dx.doi.org/10.15664/10023.23449.

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[Extract from Executive Summary] This project, aimed at the development of a novel, automated mechanism for the collection of scallop stock data was a sub-part of the Scottish Inshore Fisheries Integrated Data Systems (SIFIDS) project. The project reviewed the state-of-the-art remote sensing (geophysical and camera-based) technologies available from industry and compared these to inexpensive, off-the -shelf equipment. Sea trials were conducted on scallop dredge sites and also hand-dived scallop sites. Data was analysed manually, and tests conducted with automated processing methods. It was concluded that geophysical acoustic technologies cannot presently detect individual scallop but the remote sensing technologies can be used for broad scale habitat mapping of scallop harvest areas. Further, the techniques allow for monitoring these areas in terms of scallop dredging impact. Camera (video and still) imagery is effective for scallop count and provide data that compares favourably with diver-based ground truth information for recording scallop density. Deployment of cameras is possible through inexpensive drop-down camera frames which it is recommended be deployed on a wide area basis for further trials. In addition, implementation of a ‘citizen science’ approach to wide area recording is suggested to increase the stock assessment across the widest possible variety of seafloor types around Scotland. Armed with such data a full, statistical analysis could be completed and data used with automated processing routines for future long-term monitoring of stock.
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Israel, Alvaro, and John Merrill. Production of Seed Stocks for Sustainable Tank Cultivation of the Red Edible Seaweed Porphyra. United States Department of Agriculture, 2006. http://dx.doi.org/10.32747/2006.7696527.bard.

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Porphyra species (commonly known as ‘nori’ or ‘purple laver’) are edible red seaweeds rich in proteins, vitamins and other highly valued biogenic compounds. For years Porphyra has been cultured using seeded nets extended in the open sea, and its biomass consumed primarily in the Far East. While demands for international markets have increased steadily at an average of 20% per year, supplies are on the verge and not expected to meet future demands. Alternatively, land-based cultivation of seaweed has become attractive in the mariculture industry since (1) important growth parameters can be controlled, (2) is environmentally friendly and (3) perfectly matches with integrated aquaculture leading to sustainable, high quality products. During the last few years a tank cultivation technology for Porphyra has been developed at the Israeli institution. This technology is based on indoor production of asexual spores and their subsequent growth to 1-2 mm seedlings. The seedlings are then transferred to outdoor tanks and ponds when seawater temperatures drop to 20 °C, or below, and days become shorter during winter time. However, the current technology efficiently serves only about 100 m2 of ponds during one growth season. In order to produce seedlings in sufficient amounts, it is critical to address both technical and biological aspects of seedling production, securing optimal up-scale to commercial-size cultivation farms. We hypothesize that massive production of spores is related to thalli origin, thalli age and sporulation triggers, and that seedling survival and their subsequent growth potential is determined by the seawater quality and overall indoor growth conditions imposed. A series of bio-reactors were constructed and tested in which spore release and spore growth were separately studied. The main assessment criteria for optimal viability of the seedlings will be by determining their electron transport rate using PAM fluorometry and by subsequent growth and biomass yields in outdoor ponds. Altogether the project showed (1), controlled sporulation is possible in big outdoor/growth chamber settings provided initial stock material (small frozen seedlings) is at hand, (2), contamination problems can be almost completely avoided if stock material is properly handled (clean as possible and partially dehydrated prior to freezing), (3), spore release can significantly be enhance using high nutrient levels during thawing for P. yezoensis and P. haitanensis, but not for P. rosengurttii, (4), PAM fluorometry is an efficient tool to estimate growth capacity in both seedlings and juvenile thalli. The BARD funding also served to explore other aspects of Porphyra biology and cultivation. For example, the taxonomical status of Porphyra strains used in this study was defined (see appendix), and the potential use of this seaweed in bioremediation was well substantiated. In addition, BARD funding supported a number of opportunities and activities in the Israeli lab, direct or indirectly related to the initial objectives of the project such as: additional molecular work in other seaweeds, description of at least 2 new species for the Israeli Mediterranean, and continuous support for the writing of a book on Global Change and applied aspects of seaweeds. The technology for Porphyra cultivation in land-based ponds is readily available. This study corroborated previous know-how of Porphyra growth in tanks and ponds, and yet offers important improvements regarding seedling production and their handling for successful cultivation. This study supported various other activities opening additional important issues in the biology/cultivation/use of Porphyra and other seaweeds.
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Financial Analysis and Risk Assessment of Selected Aquaculture and Fishery Activities in the Mekong Basin. Vientiane, Lao PDR: Mekong River Commission Secretariat, April 2002. http://dx.doi.org/10.52107/mrc.akbold.

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The report assesses the financial feasibility and risks for low income target groups of interventions in aquatic resource development; interventions in resource/habitat protection and the enhancement produced or proposed under the MRC fisheries programme.
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