956 resultados para estimation des provisions


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Mathematical modelling shows that the projection area of the trawl twine influencing its hydrodynamic resistance can be reduced by approx. 30 % through increasing the mesh size of the trawl wings and the conical parts of the trawls, in combi-nation with the use of thinner twine. The interrelation between fuel consumption and projection area of the trawl twine as well as the influence of the enlarged meshes of the wings and first panels on the catch composition can only be measured by trials on fishing boats.

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The basis for a long-term profitable fishery is a precautionary and environment-compatible use of fish stocks. The fishery management presently models the exploitation through the parameters of fishing mortality and the age at first capture. These two parameters are translated into the technical measures of fishing effort and mesh openings and quotas, which are then used in practice for controlling the fishery. Stock protection can be achieved by reducing the fishing effort, by assigning smaller quotas, by reducing the number of days at sea, or by increasing the mesh opening. The respective protection measures have different effects on the development of the stocks but also on the revenue obtained by the fishery. These alternatives have been examined taking as an example the cod stock in the western Baltic. The optimization goal was the maximization of profit observing at the same time the prerequisites for stock protection according to the precaution approach. For these calculations the same models and data have been used as are beeing used in the stock management of the ACFM of ICES. The response of altered technical measures to the recruitment of cod stock was considered, and a proposal to overcome overfishing of cod in the western Baltic Sea was derived.

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Die 28. Sitzung des Codex-Alimentarius-Komitees für Fische und Fischereierzeugnisse fand in Peking, China, vom 18. bis 22. September 2006 statt. Das Komitee folgte damit der in der letzten Sitzung ausgesprochenen Einladung der chinesischen Regierung und dem Ziel, die Codex-Sitzungen in verschiedenen Teilen der Welt abzuhalten. Geleitet wurde die Sitzung von Dr. Bjørn Røthe Knudsen, Regionaldirektor der norwegischen Behörde für Lebensmittelsicherheit. Professor Li Xiaochuan von der chinesischen Akademie für Fischforschung nahm die Rolle des Co-Chairman ein. Insgesamt 140 Delegierte, die 44 Mitgliedstaaten, die EU und eine internationale Organisation vertraten, nahmen an dieser Sitzung teil. Folgende Punkte wurden auf der diesjährigen Codex-Komitee-Sitzung diskutiert: 1. Erweiterung des Standards für Sardinen und sardinenähn-liche Erzeugnisse 2. Bearbeitung des Entwurfs eines Standards für Störkaviar 3. Überarbeitung des Entwurfs eines Standards für lebende und rohe Muscheln 4. Verhandlung über den Entwurf des Standards für geräu-cherten Fisch 5. Code of Practice für Fische und Fischereierzeugnisse 6. Zukünftige Arbeiten

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The Codex Committee on Fish and Fishery Products held its 30th Session in Agadir, Morocco from 28 September to 2 October 2009, at the kind invitation of the Government of Morocco. The Session was chaired by Dr Bjørn Røthe Knudsen, Regional Director of the Norwegian Food Safety Authority. The Session was attended by 218 delegates representing 78 Member States, one Member Organization (EC) and 1 international organization.

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Several fishery independent estimates of the year-class strength are necessary for the assessment and the ma-nagement of the total fish stock. An index for the year-class strength of the spring spawning herring in the western Baltic Sea is estimated on the basis of larvae surveys in the most important spawning ground. The results indicate a good year-class 2004.

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From 1993 to 2003 special surveys were conducted to analyse temporal and spatial aspects of the spawning activities of cod in the Baltic Sea. The ICES advice for cod in the Baltic Sea is based on yearly stock assessments of two separate stocks the western (SD 22 – 24) and the eastern stock (SD 25 – 32). Both stocks are characterized by different spawning seasons. The general progression of the maturity suggests that two types of development can be distinguished. In the western Baltic Sea (SD 22) the maturity development is temporal stable, with a relative short, main spawning period from March to April - spring spawner. In the Arkona Sea and Bornholm Basin the main spawning season starts in June and probably finishes in September - summer spawner. The proportion of spawners in summer is significantly higher than in spring in the Arkona Sea and Bornholm Basin. This again underlines the importance of the Arkona Sea for the reproduction success of the eastern Baltic cod stock. The analysis furthermore show, that the proportion of male spawners was significantly higher than the proportion of female spawners in all areas and the investigated months. This observation suggests that the reproductive success is only limited by the number of female cod which participates in the spawning process.

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1963 wurde von der FAO und WHO die Codex-Alimentarius-Kommission gegründet, die Lebensmittelstandards, Richtlinien und Vorschriften wie Codes of practice im Rahmen des gemeinsamen FAO/WHO Food Standards Programme erarbeiten sollte. Hauptziel dieses Programmes ist der Schutz der Gesundheit der Verbraucher und die Sicherung fairer Praktiken im Lebensmittelhandel sowie die Koordinierung der Arbeiten zu Lebensmittelstandards, die von international, staatlichen und nicht-staatlichen Organisationen durchgeführt werden.