Robin L. Welcomme

Robin L. Welcomme
Imperial College London | Imperial · Department of Life Sciences

PhD

About

121
Publications
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9,049
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Additional affiliations
September 2010 - present
Imperial College London
Position
  • Visiting Researcher

Publications

Publications (121)
Article
Full-text available
At present, inland fisheries are not often a national or regional governance priority and as a result, inland capture fisheries are undervalued and largely overlooked. As such they are threatened in both developing and developed countries. Indeed, due to lack of reliable data, inland fisheries have never been part of any high profile global fisheri...
Chapter
Full-text available
The lower, potamonic parts of the Ganges–Brahmaputra, the Ayeyarwady (Irrawaddy), the Salween, the Chao Phraya and the Mekong and Lancang Rivers are among the longest and most productive rivers for inland fisheries in the world. Except for the Chao Phraya, they arise on the Tibetan Plateau. All have steep and turbulent upper courses within deep mou...
Chapter
Currently, inland fisheries supply c. 11×106tyear-1 of fishes and other aquatic animals for human consumption. The fisheries have increased in intensity since recording began in 1950, and this has led to increasing emphasis on the management of the resources. The fisheries are extremely diverse in the number and types of species they exploit, the f...
Book
Full-text available
In 2009, inland fisheries produced some 10 million tonnes of fish. Despite their importance to rural communities, especially in the least-developed countries, little attention has been paid to this sector in recent years. As a result, there is a deficit in management of the fisheries and also an increasing threat to freshwater by a number of non-fi...
Technical Report
Full-text available
http://www.fao.org/docrep/017/i2608e/i2608e.pdf
Article
Full-text available
Welcomme, R. L. 2011. An overview of global catch statistics for inland fish. – ICES Journal of Marine Science, 68: 1751–1756. The reported global inland fish catch passed 10 million tonnes in 2008, after almost linear growth from the early 1950s. The rise coincides with an increasing number of reports of falling catches resulting from environmenta...
Book
Full-text available
Welcomme, R. Review of the State of the World Fishery Resources: Inland Fisheries. FAO Fisheries and Aquaculture Circular No. 942, Rev. 2. Rome, FAO. 2011. 97 pp. ABSTRACT The fishery statistics reported to FAO by countries and maintained in the FishStat database are analysed for trends in quantity and composition of catches from 1950 to 2009. Catc...
Article
Full-text available
The reported annual yield from inland capture fisheries in 2008 was over 10 million tonnes, although real catches are probably considerably higher than this. Inland fisheries are extremely complex, and in many cases poorly understood. The numerous water bodies and small rivers are inhabited by a wide range of species and several types of fisher com...
Article
Full-text available
The past decade has seen increased international recognition of the importance of the services provided by natural ecosystems. It is unclear however whether such international awareness will lead to improved environmental management in many regions. We explore this issue by examining the specific case of fish migration and dams on the Mekong river....
Book
Full-text available
Global food production has increased greatly in recent years and rural livelihoods are much improved in many regions. Yet, despite this clear progress rural poverty and food insecurity remain deeply entrenched in many areas, especially in South Asia and sub-Saharan Africa. In response the international community has renewed calls for increased comm...
Article
Between 1961 and 1964 the water levels of Lake Victoria increased abruptly. This increase produced changes around the shoreline of the lake, creating new habitats in the form of lagoons. Such lagoons were cut off from the main lake by differing widths of floating vegetation. Chemically and physically these new regions resembled small tropical fish...
Article
Many small species of fish are found in the stream/swamp systems that flow into Lake Victoria. One such system, in Uganda, was inhabited permanently by only one species, although others ran into the stream when it was flooded in the rainy seasons. Other fishes were confined to the lower reaches near the mouth, but never moved far upstream.Studies o...
Article
The development of fry in the mouth of the female mouthbrooder Tilapia leucosticta Trewavas is described. The egg production by fish of various lengths is plotted and a curvilinear regression for standard and total length fitted. The number of eggs produced is approximately equal to the square of the total length in centimetres of the parent fish....
Article
The conference ‘Fish Stock Assessment Methods for Lakes and Reservoirs: Towards the True Picture of Fish Stock’ (FSAMLR) was held in September 2007 in Ceske Budejovice, Czech Republic. A total of 110 participants from 34 countries attended the meeting and 93 lectures were presented. Great advances were reported in fish surveys using hydroacoustics...
Article
Full-text available
Lake Victoria is Africa's single most important source of inland fishery production. After it was initially fished down in the first half of the 20th century, Lake Victoria became home to a series of introduced food fishes, culminating in the eventual demographic dominance of the Nile perch, Lates niloticus. Simultaneously with the changes in fish...
Article
Rivers contribute some 5 million tons of fish for human consumption, most of which comes from major floodplains. Fisheries in the tropics are over-exploited and show signs of fishing-down. Several trends are damaging river fisheries. Floodplains are being drained for irrigated agriculture, leading to modifications to their form and function. River...
Article
Recent changes in rainfall patterns in West Africa have produced drought conditions which have affected the flood regime, of the Niger River. Analysis of a 20-year series of discharge data for the river and the records of landings of fish at Moption the central delta of the Niger show catch in any year to be highly correlated with flood intensities...
Chapter
IntroductionPrinciplesApproaches to managementSocial and economic implications of managementConclusion References
Chapter
Full-text available
Migratory fish species move between habitats in order to complete their life-cycles, and are therefore vulnerable not only to fisheries, but also to habitat degradation and loss of connectivity between habitats. In order to conserve migratory fish stocks fisheries must be properly managed, critical habitats maintained and rehabilitated where they h...
Technical Report
Full-text available
Available as - www.wfduk.org/LibraryPublicDocs/WFD82_Task_2_report_guidance_freshwater AND completed in - 105. Acreman M. 2007. Guidance on environmental flow releases from Impoundments to implement the water framework Directive March 2007 Final report Project WFD82, 51pp. Project advisor panel member. www.wfduk.org/LibraryPublicDocs/Guidance_on_fl...
Article
Full-text available
The form, hydrology and functioning of rivers worldwide have been increasingly modified by a range of human activities. The impacts of these changes on the fish faunas of rivers need to be assessed for biodiversity conservation and fisheries management. Reliable and cost effective indicators of fish assemblage responses to hydrological, morphologic...
Article
The increasing demands that are being placed on water for a range of human uses are leading to growing control over flow in rivers by storage, abstractions, transfers, channel modification and controlled releases. The changes modify natural hydrographs affecting fish in a number of ways. As a result the quantity of the fish caught in many of the wo...
Article
Fisheries are in decline in many of the world's rivers. This is because of the way in which the form and function of rivers are changing in response to the pressures placed upon them by a number of other human uses and because of a failure to manage the fisheries themselves. It is unlikely that many of the human induced changes to rivers will be re...
Article
Full-text available
The control of fishing mortality via fishing effort remains fundamental to most fisheries management strategies even at the local community or co-management level. Decisions to support such strategies require knowledge of the underlying response of the catch to changes in effort. Even under adaptive management strategies, imprecise knowledge of the...
Article
The factors regulating fish production from river systems remain poorly studied and understood. Rivers conform to physical and chemical laws which determine their morphology. From these laws relationships are calculated which estimate the total length and number of streams of different order on the African continent. Edaphic factors very less than...
Article
A method of fishing using installations of the fish-park type, known collectively as acadjas, is common in the coastal lagoons of Dahomey. Acadjas are installed in shallow sheltered waters and are constructed of dense masses of branches planted in the muddy bottom. Two main types exist, small circular acadjavis and large rectangular avas, but these...
Chapter
Full-text available
Most small waterbodies were built for irrigation and/or drinking water storage for humans and livestock, but have also been shown to play an important role in watershed management. Apart from natural lakes, small waterbodies are generally of two types: 1) reservoirs created by damming a river and, 2) ponds built on watersheds to collect and store s...
Article
Full-text available
Inland waters have received only slight consideration in recent discussions of the global fisheries crisis, even though inland fisheries provide much-needed protein, jobs, and income, especially in poor rural communities of developing countries. Systematic overfishing of fresh waters is largely unrecognized because of weak reporting and because fis...
Conference Paper
Establishing flow and water level criteria for the maintenance and conservation of fish assemblages in rivers. The potential role of flow and water level criteria on fish species and populations in English and Welsh rivers was determined to provide, for various river reach types, generic seasonal flow and water level regime requirements for key li...
Chapter
Full-text available
Throughout the twentieth century Lake Victoria underwent massive and fundamental changes in its ecology that resulted in the fishery being converted from a multi-species system exploiting native fishes, to one in which three species make up most of the catch, two of which are introduced. With the new century, there are indications that this extreme...
Article
Increasing multi-sectoral demands on water resources have led to water abstraction and transfer activities, and the construction of dams and embankments that have significantly altered the flood regimes of rivers throughout the world resulting in the loss of fish production and biodiversity. The current emphasis on sustainable development and biodi...
Article
Abstract A framework is described which proposes a sequential series of questions to guide the fisheries manager or student of fisheries through the process of planning and managing an inland fishery. It proceeds from such general issues as the place of inland fisheries in national and regional sector plans to prescriptions for the application of s...
Article
Full-text available
There is a growing recognition of the need to conserve biodiversity that has been conceptualised in the Convention of Biological Diversity. Maintenance of fish species richness is particularly important, because habitat degradation in inland waters continues to accelerate on a global scale. Here we develop empirical models for predicting fish speci...
Article
Brush and vegetation parks are common features of many tropical river fisheries. Areas of branches of certain tree and bush species combined with floating vegetation are placed in shallow, sheltered water so as to attract fish. They provide cover and spawning areas for many fish species. They are particularly rich trophically because of the abundan...
Article
An analysis of covariance relating basin area (A, km2) to river length (L, km) and discharge rate (D, m3 s–1) was performed for two continents and showed that the two covariates (L and D) were highly significant and that the strength of the relationship changed between continents. For comparison, D was excluded but the result remained the same. Alt...
Chapter
Full-text available
The aquatic ecosystem work of the Challenge Program (CP) on Water and Food will seek to develop and apply systems of management that sustain and, where possible, enhance the benefits to people from these systems as an integral part of approaches to improving water productivity at the basin level. It will do so through analysis, development and diss...
Article
The fauna of inland waters, especially in the tropics, consist of complex assemblages of numerous species, which are not accessible to analysis by conventional stock assessment methods. The formulation of policies for management and conservation requires alternative models which are capable of predicting the ways in which such assemblages change in...
Article
Full-text available
Fish are heavily influenced by the nature of the flood regimes of the rivers in which they live. These fluctuate naturally from year to year but recently increasing pressure on water for a wide range of uses other than fisheries has led to human activities that have substantially altered the flood regimes of many rivers throughout the world. This h...
Article
Freshwater ecosystems are situated in depressions in the landscape. As a result they accumulate the impacts of human activities. The quality of fish habitat depends to a great extent on the density of the human population and its activities within the basin. Anthropogenic impacts on fish habitats can be defined both technologically and ecologically...
Article
Full-text available
The guidelines were published in 1999 as FAO Fisheries Technical Paper 384 (see back cover). Inside this leaflet, we provide some of the key messages from each of the chapters 1-4 of Part 1 of the paper, as listed below: Why mange? Because floodplains are both valuable and vulnerable What to manage? The environment, the fish and fishing Who should...
Article
With increasing pressure on the world's inland and coastal marine fisheries, increases in production and quality of yield are being sought through the application of a range of enhancement techniques. Which of these is applied depends on the attitude to the natural resource by societies at different levels of economic development. The range of enha...
Article
An analysis of covariance relating basin area (A, km2) to river length (L, km) and discharge rate (D, m3 s-1) was performed for two continents and showed that the two covariates (L and D) were highly significant and that the strength of the relationship changed between continents. For comparison, D was excluded but the result remained the same. Alt...
Article
A framework is described which proposes a sequential series of questions to guide the fisheries manager or student of fisheries through the process of planning and managing an inland fishery. It proceeds from such general issues as the place of inland fisheries in national and regional sector plans to prescriptions for the application of specific t...
Chapter
Fisheries in the marine and inland waters of Europe have been an important source of food and employment since the human occupation and development of the continent. Drastic changes have occurred in the last century which have altered the yield and the expectation from these resources. Rapid technological development created overcapacity in the mar...
Article
Human use of river systems has intensified considerably in the last century due to increasing population and the associated higher demand for water through industrial and agricultural technologies. This intensification process has impacted rivers and resident organisms. Natural rivers have rich and varied fish faunas adapted to the variable climate...
Article
Fish communities of inland and coastal waters react to fishing pressure and environmental stresses by the disappearance of larger individuals and species and an increasing dominance of smaller fishes. Changes in the water quality and quantity, the timing of discharges and the structure of the environment have had a major modifying effect on populat...
Article
Full-text available
This paper applies concepts of landscape ecology and patch dynamics to lotic systems. We present a framework for the investigation of pattern and process in lotic ecosystems that considers how specific patch characteristics determine biotic and abiotic processes over various scales. Patch characteristics include: size, size distribution within the...
Article
Full-text available
En dépit de la grande extension du réseau lotique africain, son ichtyofaune est moins intensivement étudiée que celle des lacs et des réservoirs ... La caractéristique essentielle des rivières africaines est le rythme saisonnier des crues qui exerce une forte influence sur la biologie des poissons. Du point de vue des communautés ichtyologiques on...
Article
Transfers of fish species between countries have been carried out with increasing frequency in the last two decades. Whereas many introductions have been of great benefit in that they have formed the basis for new fisheries or for expanded aquaculture, others have created growing international concern. It is obviously impractical to ban any future...
Chapter
The Niger, the main river draining W Africa, has been a major nucleus for human habitation for several thousand years. Rock paintings and other artefacts attest to settlement during Palaeolithic and Neolithic times. More recently a succession of kingdoms — the Sarakali Empire of Ghana (8–13th century), the Mandingo Empire of Mali (13–15th century)...
Article
The European Inland Fisheries Advisory Commission (EIFAC), a regional commission of the Food and Agriculture Organization of the United Nations, convened a Symposium on Stock Enhancement in the Management of Freshwater Fisheries in conjunction with its 12th Session held at Budapest, Hungary, 29 May through 2 June 1982. The Symposium addressed the t...
Article
Job number added acc. to DOCREP assignment. Spanish ed. published in 1980
Article
Assessment of the resources available to small-scale fisheries is necessary to provide information for those taking-decisions that can affect the fishery. Because of the diffuse nature and complexity of species compo- sition of many small-scale fisheries, traditional methods of gathering and interpreting data, which were developed for industrial-sc...
Chapter
Inland fisheries are non-consumptive with respect to the aquatic resource, but are very sensitive to changes within the ecosystem. Various other uses of water can act upon fisheries usually to their detriment. Proper management techniques including aquaculture can maintain at least a proportion of the fish production from waters in arid zones there...
Article
A model is developed which describes the way in which the fish populations of African rivers and their fisheries are influenced by the different types of flood Regime. Ichthyomass and fish catch are dependent on both the extent of flooding during high water and the amount of water remaining in the system during the dry season. The relative number a...
Article
The factors regulating fish production from river systems remain poorly studied and understood. Rivers conform to physical and chemical laws which determine their morphology. From these laws relationships are calculated which estimate the total length and number of streams of different order on the African continent. Edaphic factors vary less than...
Article
Full-text available
Traditional methods for studying inland fishery resources are proving inadequate fr,r the provision of the information needed for the formulation of management pvlicy. There has, therefore, been an atteppt to derive new methods at the community level, which alrhough less precise can provide estimates more rapidly and cheaply. Lakes, reservoirs, riv...