tailieunhanh - FISH STOCK ASSESSMENTS IN THE MEDITERRANEAN: STATE OF THE ART*

An alarm system is composed of three primary elements: sensors, controls and annunciation. Sensors consist of switches, motion detectors, sound or vibration detectors and other devices that are designed to “sense” the presence of an intruder, either the point of entry or when he moves within the residence Sensors can also take the form of buttons, that the occupant uses to activate a duress alarm. Controls consist of a panel and a keypad into which a code number that arms or disarms the system is entered. Controls also perform other functions that allow flexibility in how and when an alarm system is armed or disarmed. Finally, the annunciation. | SCI. MAR. 67 Suppl. 1 37-49 Scientia Marina 2003 FISH STOCK ASSESSMENTS AND PREDICTIONS INTEGRATING RELEVANT KNOWLEDGE. 0. ULLTANG and G. BLOM eds. Fish stock assessments in the Mediterranean state of the art JORDI LLEONART and FRANCESC MAYNOU Institut de Ciències del Mar CSIC Passeig Marítim de la Barceloneta 37-49 08003 Barcelona Spain. SUMMARY The Mediterranean fisheries are characterised by fragmented fleets usually composed by relatively small vessels use of a large number of landing sites multi-species catches and low CPUEs. Fish are commercialised mainly fresh and the prices are relatively high. These factors make it difficult and expensive to get extensive and reliable data time series and to get biological samples. Most of the fish caught in the Mediterranean are the recruits 0-1 year old of the main target species. Since the recruitment is much more uncertain than the abundance of the adult stages the assessments are also more uncertain. Furthermore no TAC or adaptive management is in place so the administrations do not require monitoring in order to manage the fisheries. The continental shelf is narrow with some exceptions and there are few stocks shared between two or more countries. Consequently the international management structures have not been sufficiently enforced and until recently no regular assessments were made by international working groups. These characteristics have led to a situation in which most of the assessments have been done in the framework of scientific projects and therefore do not have continuity in time. The results of these assessments have rarely been incorporated in management. Key words Mediterranean fisheries stock assessment. INTRODUCTION The assessment of Mediterranean fisheries faces some significant challenges arising from both the physical constraints of the Mediterranean Sea and the socio-economic and historic characteristics of the fishing activities. In general the lack of connection between assessment and .

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