Baglinière, J-L., Marchand, F., and Vauclin, V. 2005. Interannual changes in recruitment of the Atlantic salmon (Salmo salar) population in the River Oir (Lower Normandy, France): relationships with spawners and in-stream habitat. e ICES Journal of Marine Science, 62: 695e707.Since 1985, the dynamics of the Atlantic salmon (Salmo salar) population in the River Oir, a spawning tributary of the River Sélune (Lower Normandy, France), have been studied from a data set of parr density and the number and the age structure of migrating fish (smolts and adults). Parr densities (1.5e17.4 per 100 m 2 ) and smolt production (0.25e9.2 per 100 m 2 ) varied considerably from year to year. Migrating juveniles were mainly 1 year old. Abundance of parr and smolts was strongly correlated with 0C densities. Egg-to-smolt survival rates were highly variable year on year (0.044e1.07%). During the juvenile freshwater phase, mortality was highest between the egg and the 0C stage (97.5e99.9%). The fluctuations in abundance of juvenile salmon appear to be linked to the number and distribution of spawners within the stream during spawning, and also to the amount of silt deposition on the spawning beds. As a result, mortality was highest during the under-gravel phase, and the mean survival rate from egg to smolt was much lower than in rivers less impacted by human activities. Therefore, during the study period, the low production of smolts during some years might lead to a low renewal rate of the salmon population.

RÉSUMÉUne méthode de détermination externe du sexe basée sur le dimorphisme sexuel de la longueur relative de la mâchoire supérieure est appliquée chez le Saumon Atlantique (Salmo salar L.). 78 adultes capturés en juin et juillet 1990 dans trois rivières des Asturies (Nord de l'Espagne) sont étudiés. L'Analyse Linéaire Discriminante sur un échantillon de 63 poissons donne un pourcentage d'erreurs de moins de 10 %. Les résultats sont comparés à ceux obtenus sur d'autres cours d'eaux de l'aire de répartition du Saumon atlantique et sont discutés en fonction de la composition de l'échantillon.Mots-clés : Saumon atlantique, Salmo salar, sexe, dimorphisme sexuel, détermination du sexe, Espagne. USE OF A TECHNIQUE TO DETERMINE THE SEX OF ATLANTIC SALMON {SALMO SALAR L.) IN THE RIVERS OF ASTURIAS (SPAIN) ABSTRACTA technique to determine the sex of Atlantic salmon (Salmo salar L.) from the sexual dimorphism of the relative length of the upper jaw bone was used. A total of 78 adults caught in june and July 1990 in three Spanish rivers of Asturias (Spain) were studied. Linear Discriminant Analysis from a sample of 63 fish gave an error percentage less than 10 %. Results were compared to those obtained in other rivers of the distribution area of Atlantic salmon and were discussed in relation to the structure of the sample.

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Cet article rappelle le contexte géographique et le cadre international du bassin du Rhin, Il présente la situation et l'avancement des actions en faveur des poissons migrateurs amphihalins sur le corridor rhénan jusqu'en fin d'année 1999. Une attention particulière est portée aux actions concernant la partie française du bassin. Sont ensuite présentées les tendances actuelles et les perspectives envisageables pour la décennie 2001-2010 sur l'ensemble du bassin.

A considerable number of people harbor intracranial aneurysms (IA), which is a focal or segmental disease of the arterial wall. The pathophysiologic mechanisms of IAs formation, growth, and rupture are complex. The mechanism also differs with respect to the type of aneurysm. In broad aspects, aneurysms may be considered a disease of the vessel wall. In addition to the classic risk factors and the genetic/environmental conditions, altered structural and pathologic events along with the interaction of the surrounding environment and luminal flow dynamics contribute to the aneurysm’s development and growth. In this review, we have tried to simplify the complex interaction of a multitude of events in relation to vessel wall in the formation and growth of IAs.