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DocumentOther documentWorld tea production and trade
Current and future development
2015Also available in:
No results found.Tea (Camellia sinensis) is the manufactured drink most consumed in the world. Discovered about 2700BC, it is one of the oldest beverages in the world. Today it is available for consumption in six main varieties, based on the oxidization and fermentation technique applied. The tea crop has rather specific agro-climatic requirements that are only available in tropical and subtropical climates, while some varieties can tolerate marine climates of British mainland and Washington area of the Unites S tates. The tea plant needs a hot, moist climate. Its specific requirements are: temperatures ranging from 10-30oC (zone 8 climate or warmer), minimum annual precipitation of 1250 mm, preferably acidic soils, ideally 0.5-10 degree slopes and elevations up to 2000 meters. Tea production therefore is geographically limited to a few areas around the world and it is highly sensitive to changes in growing conditions. Importantly, its ideal growing conditions are at high risk and expected to significan tly change under climate change. -
MeetingMeeting document25th Intergovernmental Group on Tea – Current global market situation and medium-term outlook - CCP:TE 24/2 2024
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Book (series)HandbookHandbook on fish age determination: a Mediterranean experience 2019
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No results found.Fish age, among other biological parameters, is one of the most relevant pieces of data in reaching sustainable exploitation of fishery resources. Indeed, most analytical methods used in stock assessment require knowledge of demographic structure according to the age of stocks, as well as to recruitment, growth, maturity, natural mortality, etc., which are strictly linked to information on age and age structure. The literature on ageing analysis shows some gaps regarding ageing schemes, criteria and methodologies used in preparing calcified structures. These aspects affect both the precision and accuracy of age estimation. One action that could be taken to overcome this gap was to formalize a handbook that clarified approaches to ageing schemes, criteria and preparation methods. Having a common protocol is fundamental to decreasing relative/absolute bias associated with the activities of age determination and to improving the precision (reproducibility and reduction of the coefficient of variation) of age readers from the various laboratories. In the light of these considerations, this handbook aims to be a guideline to standardizing the methods used in fish ageing studies. The document is focused on a description of the general principles on which age analysis relies (assignment of birth date, preparation methods, aging scheme reading and identification of true and false rings). Moreover, common shared analysis methods can enable a high level of calibration among the diverse institutes involved, thus improving the quality and reliability of results. The volume is subdivided into five main sections: Small Pelagic Species, Demersal Species, Cartilaginous Species, Large Pelagic Species and the European Eel. For each section, information on extraction and storage, preparation method, interpretation of age (age scheme) and ageing criteria are provided by species. In total, 30 species were analysed: 6 small pelagic, 12 demersal, 5 cartilaginous, 6 large pelagic and the European eel. These species represent some of the most important fish from an economic and ecological point of view. Thus this volume represents one of the most complete outlooks for fish ageing analysis in the Mediterranean context.