A5000956039- Marine and fisheries research
- Fish Ecology and Management Studies
- Marine Bivalve and Aquaculture Studies
- Coral and Marine Ecosystems Studies
- Fish Biology and Ecology Studies
- Coastal and Marine Management
- Genetic and phenotypic traits in livestock
- Statistical Methods and Bayesian Inference
- Forecasting Techniques and Applications
- Identification and Quantification in Food
- Ichthyology and Marine Biology
- Risk Perception and Management
- Probabilistic and Robust Engineering Design
- Isotope Analysis in Ecology
- Marine Ecology and Invasive Species
- Bayesian Modeling and Causal Inference
- Economic and Environmental Valuation
- Statistical Methods and Inference
- Aquaculture Nutrition and Growth
- Hydrology and Drought Analysis
- Transportation Planning and Optimization
- Data Analysis with R
- Diverse Scientific and Engineering Research
- Crustacean biology and ecology
- Advanced Control Systems Optimization
Imperial College London
2018-2024
Food and Agriculture Organization of the United Nations
2021
Tokyo University of Marine Science and Technology
2021
Joint Research Centre
2021
Wageningen University & Research
2021
Swedish University of Agricultural Sciences
2021
Seychelles Fishing Authority
2021
International Commission for the Conservation of Atlantic Tunas
2009-2017
Centre for Environment, Fisheries and Aquaculture Science
2001-2011
Lowestoft Hospital
1999-2009
Abstract Kell, L. T., Mosqueira, I., Grosjean, P., Fromentin, J-M., Garcia, D., Hillary, R., Jardim, E., Mardle, S., Pastoors, M. A., Poos, J. J., Scott, F., and R. D. 2007. FLR: an open-source framework for the evaluation development of management strategies. – ICES Journal Marine Science, 64: 640–646. The FLR (Fisheries Library R) is a effort directed towards fisheries overall goal to develop common facilitate collaboration within across disciplines (e.g. biological, ecological,...
Abstract Ecosystem-based management requires the development of indicators that allow anthropogenic impacts to be detected against background natural variation. Size-based community metrics are potentially useful because their theoretical foundation and practical utility. Temporal spatial patterns in size-based for Celtic Sea fish described calculated using data from English groundfish survey area (1987–2003). The results reveal size structure has changed over time, a decrease relative...
Abstract Engelhard, G. H., Pinnegar, J. K., Kell, L. T., and Rijnsdorp, A. D. 2011. Nine decades of North Sea sole plaice distribution. – ICES Journal Marine Science, 68: 1090–1104. Recent studies based mainly on research survey data suggest that within the Sea, Solea solea Pleuronectes platessa have exhibited distribution shifts in recent decades—on average southward for northward to deeper waters plaice. Various hypotheses may account such shifts, including climate change effects more...
The quantity of data from many small-scale fisheries is insufficient to allow for the application conventional assessment methods. Even though in countries they are moving closed-loop simulations assess performance different management procedures data-limited situations, managers most developing still demanding information on stock status. In this study we use common metric harvest rate evaluate and compare following catch-only length-only models: catch – maximum sustainable yield...
Abstract A variety of tools are available to quantify uncertainty in age‐structured fish stock assessments and management forecasts. These based on particular choices for the underlying population dynamics model, aspects assessment considered uncertain, approach assessing (Bayes, frequentist or likelihood). The current state art is advancing rapidly as a consequence availability increased computational power, but there remains little consistency made This can be explained by several factors...
Abstract The World Conference on Stock Assessment Methods (July 2013) included a workshop testing assessment methods through simulations. exercise was made up of two steps applied to datasets from 14 representative fish stocks around the world. Step 1 involved applying stock assessments with varying degrees effort dedicated optimizing fit. 2 subset and characteristics given model fits being used generate pseudo-data error. These were then provided modellers consistency checks within...
Large scombrids, commercial tuna species, are regularly assessed and managed. However, most of the small many mackerels bonitos, lack accurate catch data to implement traditional stock assessments despite their economic importance in small-scale fisheries. In this study, we analysed different approaches using length composition from multiple fleets with gear selectivity assess scombrids Atlantic Ocean. Using simulated populations, compared two length-based methods (length-based spawning...
Integrated analysis has increasingly been the preferred approach for conducting stock assessments and providing basis management advice fish invertebrate stocks around world. Many decisions are required when developing integrated assessments. For example, analyst needs to decide whether model fits data, if optimization was successful, estimates consistent retrospectively, is suitable predict future responses fishing. This study provides practical guidelines implementing selected diagnostic...
Abstract Kell, L. T., Dickey-Collas, M., Hintzen, N. Nash, R. D. Pilling, G. and Roel, B. A. 2009. Lumpers or splitters? Evaluating recovery management plans for metapopulations of herring. – ICES Journal Marine Science, 66: 1776–1783. The long-term a stock representing metapopulation has been simulated in case study loosely based upon herring to the west British isles, where stocks are currently assessed managed by area, although there is evidence mixing between (in terms connectivity,...
Abstract Mäntyniemi, S., Kuikka, Rahikainen, M., Kell, L. T., and Kaitala, V. 2009. The value of information in fisheries management: North Sea herring as an example. – ICES Journal Marine Science, 66: 2278–2283. We take a decision theoretical approach to management, using Bayesian integrate the uncertainty about stock dynamics current status, express management objectives form utility function. new information, potentially resulting control measures, is high if expected help differentiating...
Abstract Tidd, A. N., Hutton, T., Kell, L. and Padda, G. 2011. Exit entry of fishing vessels: an evaluation factors affecting investment decisions in the North Sea English beam trawl fleet. – ICES Journal Marine Science, 68: 961–971. A profitable fishery attracts additional effort (vessels enter), eventually leading to overcapacity less profit. Similarly, vessels exit depending on their economic viability (or reduced expectations future benefits) or encouraged by schemes such as...
Using a management strategy evaluation approach, we compare range of new and established procedures (MPs) for setting catch-limits in fisheries. Performance is evaluated with respect to fish life history type, level stock depletion, data quality, autocorrelation recruitment strength. We quantify the robustness each MP various observation processes. Methods using observations absolute biomass or depletion offer best overall performance this consistent across types, qualities, levels. Simple...
Abstract Reference points based on fishing mortality ( F ) and spawning stock biomass SSB are a requirement of many fisheries management frameworks. is assumed to be proxy for reproductive potential SRP ). Limit reference used indicate the level below which productivity affected. fails account changes in fecundity, egg viability sex ratio, it has been argued that total production TEP provides better reflection . We explore how accounting impacts limit evidence relationship between recruit....
Abstract The adoption of the Precautionary Approach requires providing advice that is robust to uncertainty. Therefore, when conducting stock assessment alternative, model structures and data sets are commonly considered. primary diagnostics used compare models examine residuals patterns check goodness-of-fit conduct retrospective analysis stability estimates. However, residual can be removed by adding more parameters than justified data, ignoring data. neither alone for validation, which...
To ensure sustainability, the Ecosystem Approach to Fisheries (EAF) requires evaluation of impacts fisheries beyond main targeted species, include those on bycaught, endangered threatened and protected populations keystone species. However, traditional stock assessments require extensive datasets that are often unavailable for data-limited fisheries, particularly in small-scale settings or Global South. This study evaluates robustness length-based approaches fish assessment by comparing...
Abstract Robustness of both short-term stock biomass recovery and longer-term sustainable management strategies to different plausible climatic change scenarios were evaluated for North Sea cod (Gadus morhua), where climate was assumed impact growth recruitment. In the short term, had little effect on recovery, which depends instead upon reducing fishing effort allow existing year classes survive maturity. longer has greater effects status, but higher yields can be expected if mortality is...
Abstract This paper describes a simulation study that evaluated the performance of scientific advisory process used by ICES to recommend total allowable catches (TACs) for roundfish stocks. A “management strategy evaluation” approach is used, involving development an operating model represent underlying reality, and observation generate pseudo data are then within management procedure. The procedure comprises assessment uses estimate parameters interest decision rule derive TAC...
Ecological risk assessment is a useful methodology for assisting the management of fisheries from an ecosystem perspective. Atlantic tuna fisheries, managed by International Commission Conservation Tunas (ICCAT), are economically important and interact with several bycatch species. In spite these interactions, no comprehensive ecological has been conducted species caught in ICCAT fisheries. this paper, we followed two stage approach objective assessing relative being negatively impacted An...
Abstract Relative indices of abundance by age class for bluefin tuna from 1975 to 2000 were estimated using generalized linear mixed models. Age was included as a fixed factor within the model specifications, with Year×Age interaction component in order obtain annual age. Catch and effort data on available two sources, catches trip, daily logbooks. Catches modelled delta-lognormal model. The finally selected following explanatory factors: Year, Age, Year×Age, Month, number Crew, Bait Tanks,...