Building fish enclosure in Lake Nasser

This document is part of a series of 5 technical manuals produced by the Challenge Program Project CP34 “Improved fisheries productivity and management in tropical reservoirs”. This manual is based on the experience gained by the partners of the project “Improved Fisheries Productivity and Management in Tropical Reservoirs” (CP34) funded by the Challenge Program on Water and Food. As part of this project, the partners designed, developed and tested in the field three enclosures in Lake Nasser in Egypt. The objective of the manual is to document for practitioners the main technical lessons gained from these experiments. (Document contains 16 pages)

Responsible fish utilization

These guidelines have been produced to support the implementation of the Code of Conduct for Responsible Fisheries particularly with regard to the need for responsibility in the post– harvest sector of the fish producing industry. The industry that produces fish for food has three major areas of responsibility: to the consumer of the food to ensure that it is safe to eat, is of expected quality and nutritional value, to the resource to ensure that it is not wasted and to the environment to ensure that negative impacts are minimized. In addition the industry has a responsibility to itself to ensure the continued ability of many millions of people throughout the world to earn a gainful living from working within the industry. Article 11.1 of the Code of Conduct for Responsible Fisheries and other related parts of the Code are concerned particularly with these responsibilities. This publication provides annotation to and guidance on these articles to assist those charged with implementation of the Code to identify possible courses of action necessary to ensure that the industry is conducted in a sustainable manner. (PDF contains 42 pages)

The Affects of acid mine drainage on the water quality, and benthic macroinvertebrate and fish population in streams in Maryland

The purpose of this study was to measure and evaluate relationships between populations of benthic macroinvertebrates and fish, as well as variations in water quality in streams affected by acid Mine drainage. (PDF contains 21 pages)

Addressing technical, social and economic constraints to rice fish culture in Laos, emphasising women’s involvement: DFID Aquaculture Research Programme Project R6380Cb, final technical report

[PDF contains 83 pages]

Der Haftwasseranteil bei Heringsanlandungen über Bandwaagen

In 2004 the fish processing company Euro-Baltic Fischverarbeitungs GmbH Mukran, went into operation on the Isle of Rügen at the Baltic coast of Germany. About 20 % of the herring landed there is discharged from the cutters into the processing plant by pipes, driven by pumps, in case that the landed volume exceeds 10 t fresh weight. In such case the herring is transported in water suspension by means of a pressure-vacuum suction pump system into containers and further transported via conveyer belt to a flowscale. During this process most of the water runs off. It is however unknown how much water remains with the fish and is eventually weighted as fish. To estimate this proportion the mixture of water and fish was stored in special transport containers, which allow the measurement of the run-off. As a result the study shows that on average 2 % of weight measured by the tape scale is water. Along with this factors were determined which influence the variability of the proportion of water.

Entwicklung einer einfachen und schnellen Analysenmethode für Kohlenmonoxid in Fisch und Durchführung orientierender Untersuchungen

Treatment with gases containing CO, misleadingly called “tasteless smoke” or “clear smoke”, prior to freezing of fish like tuna, tilapia and swordfish (to name only a few of these species that are characterised by an intensive coloration of flesh) stabilise the fresh red colour of muscle also after thawing and suggest consumers non-existing freshness. In the European Union, carbon monoxide is excluded from being a permitted additive and therefore this handling is not allowed. Notwithstanding of the clear legal position, producers and traders are trying to establish CO treated fish on the market. In the case of taking legal measures the food control laboratories have to provide evidence that fish has been treated by CO and therefore a respective method is necessary. The method of determination of carbon monoxide in fish flesh presently applied requires considerable material and mechanistic effort to detect CO by GC after catalytic transformation into methane. The aim of our work was a direct detection of CO using suitable sensor technology. Mechanistic requirements and results of preliminary investigations to detect carbon monoxide in fish flesh will be described.

WEFTA-Laborvergleichsuntersuchungen zur pH-Bestimmung in Fischerei-Erzeugnissen - Eine gemeinsame Aktion der Western European Fish Technologists' Association

12 samples (6 original samples and 6 diluted samples) were analysed by 14 WEFTA laboratories for their pH values in an inter-laboratory comparison exercise. As a result it can be stated that the majority of participating laboratories could determine the pH values very exactly. The pH values obtained are ranging only little around the calculated mean (less than 0.1 pH unit). It could also be demonstrated that the participating institutes could analyse both, pH values in fishery products and aqueous salt solutions. However, also in this exercise a number of outliers and deviating values have been detected. Therefore it is of utmost importance to calibrate the pH electrodes in regular intervals and to maintain them carefully. Intra-laboratory comparison measurements are recommended to detect weak points.

32. Jahretagung der West European Fish Technologists Association

Die West European Fish Technologists Association (WEFTA, gegründet 1970) ist ein Zusammenschluß von Europäischen Insti-tuten, die auf dem Gebiet Fischerei, Fischqualität und -verarbeitung arbeiten und forschen. Ziele der WEFTA ist der Informa-tionsaustausch zwischen Wissenschaftlern und Fischindustrie sowie die Ausweitung und Verbesserung der Zusammenarbeitunterschiedlicher Interessengruppen und Instituten in Projekten.

30. Jahrestagung der "WestEuropean Fish Technologists' Association" in Torshavn, Faroer

In der West European Fish Technologists’ Association (WEFTA) arbeiten zahlreiche europäische Institute zusammen, die sich mit Fisch als Lebensmittel oder mit Fischtechnologie befassen. Ziel der WEFTA ist es, einen Austausch von Informationen über Forschung und ihre Ergebnisse europaweit möglich zu machen. Die Jahrestagungen sind eine gute Gelegenheit, Einblick in die Arbeiten anderer Institutionen zu erhalten und europäische Kontakte zu knüpfen. Die Tagungen sind besonders interessant für junge Wissenschaftler, die hier ihre Ergebnisse einem grösseren Publikum vorstellen konnen.

Vergleichende Eislagerung von ausgenommenen und unausgenommenen Schleien

New regulations of the German “Fisch-Hygiene-Verordnung” lay down that all fish except pelagic species have to be gutted immediately after catch or killing, especially fresh water fish from aquaculture. Only gutted fish should be sold to the consumer. At the present time, however, it is not unusual to sell ungutted fish like tropical or mediterranean species from foreign countries, even the EC area. In this investigation the influence of gutting on the fish quality during storage on ice was tested in tench (Tinca tinca) as a model. Quality changes were controlled by sensory, chemical, physical and microbiological assessment. It was shown that for tench there were no differences between gutted and ungutted fish during 12 days of storage on ice.

31. Jahrestagung der "West European Fish Technologit´s Association" in Espoo, Finnland

Vom 27.-31. Mai 2001 fand in Espoo, Finnland, die 31. Jahrestagung der WEFTA (West European FishTechnologist’s Association) statt. 75 Teilnehmer aus15 europäischen Ländern, der FAO und der Europäischen Kommission sowie aus den USA und Kanadawaren der Einladung des VTT Biotechnology, eines großen finnischen Forschungsinstituts auf dem Gebiete der Biotechnologie und biologischer Materialien, zu dieser Tagung gefolgt. Die Durchführung in einemKongresszentrum in Espoo, nahe der finnische Hauptstadt Helsinki direkt am Bottnischen Meerbusen gelegen, ermöglichte einen straffen organisatorischen Ablauf und die Einhaltung des Zeitplanes der mit 41 Vorträgen und 18 Postern recht umfangreichen Veranstaltung, die in 7 Themenkomplexe gegliedert war. Nachfolgend werden wesentliche Ergebnisse der einzelnen Beiträge zusammengefasst

Strategies for increasing freshwater fish production in the Green Revolution Programme

Sources of fish and fishery products in Nigeria were reviewed. The problems of various agencies involved in freshwater fish production in Nigeria were also analysed, such problems included shortage of manpower, inadequate training for personnel, shortage of funds, lack of infrastructures, among others

Developing a viable fish farming industry in Nigeria -- an alternative strategy to the strategy in the Green Revolution Programme

A study was embarked upon with the twin objectives of reviewing the Green Revolution Strategy for accelerating fish production in the country and proposing an alternative strategy, a private sector approach. Some of the programmes listed in the Green Revolution are very necessary for developing a viable - fish farming industry and that money spent under such programmes is money well spent. Programmes that are also desirable but need to be considerably expanded were identified. Other programmes have been criticised on the grounds that the method chosen to achieve the desired objectives is fraught with dangers if sufficiently long run view of fisheries development is taken

Strategies for transfer of aquaculture technology to small-scale fish farmers in Nigeria

There is increasing awareness of aquaculture in Nigeria today for a number of reasons namely: water pollution, declining catch and the awareness of the attractiveness of aquaculture as an investment area and a pivotal point for national development. The development of aquaculture in Nigeria, requires the building up of institutions at the grassroot level and the formulation of policies and programmes for the small fishfarmer. This of course would be backed up by a sound technology generation, verification and packaging, dissemination and use programme

Preliminary studies of the dual role of cotton-seed cake as fish feed and fish pond fertilizer in aquaculture

Many locally available fish feeds have been tried in fish culture. These include guinea corn, soya bean, groundnut cake and rice bran. Cotton seed cake has been successfully used as a fishpond organic fertilizer at Ado-Ekiti Government fish farm. Three fishponds stocked respectively with common carps, Heterotis, Tilapia spp., Clarias lazera and Heterobranchus were fed with cotton seed cake. Carps, Tilapia and Heterotis increased rapidly in weight and length while the catifishes did not grow