Consulta: subjectFacets:"Allis shad"
Registros recuperados: 5
Data/hora: 01/06/2024 01:10:39

Upstream migration and reproductive patterns of a population of allis shad in a small river (L'Aulne, Brittany, France)
Provedor de dados: 5
Autores: Acolas, M; Veron, V; Jourdan, H; Begout, Marie-laure; Sabatie, M; Bagliniere, J.l.
The characteristics and activity of adult allis shad [Alosa alosa (L.)] were analysed during the last part of their upstream migration in the L'Aulne, a small river in Brittany, and during reproduction on a unique spawning ground downstream of an insurmountable dam. The age of the spawners ranged front three to seven years, females being larger and older than males. Population-level migration and reproduction were studied by counting the number of migrating fish, by estimating the sex ratio, and by counting the number of nocturnal spawning acts for three consecutive years starting in 2000. The influence of the environment, especially water temperature and discharge, was highlighted: temperature during migration may supplant the influence of water flow,...
Tipo: Text
Palavras-chave: Small river; Reproduction; Biological features; Anadromous migration; Allis shad.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1214.pdf

Poor oxic conditions in a large estuary reduce connectivity from marine to freshwater habitats of a diadromous fish
Provedor de dados: 5
Autores: Tetard, Stephane; Feunteun, Eric; Bultel, Elise; Gadais, Romain; Begout, Marie-laure; Trancart, Thomas; Lasne, Emilien.
Connectivity in aquatic systems is often related to abundance and permeability of physical barriers, such as dams, which delay or impede movements of biota with important consequences for aquatic biodiversity. Water quality may, however, also control connectivity between essential habitats. In macrotidal estuaries, Estuarine Turbidity Maxima (ETM) have a strong impact on water quality because of the low oxygen concentration occurring as a response to the related high bacterial and low photosynthetic activities. In this study, we assess Allis shad estuarine spawning migration in 2011 and 2012 in the Loire River (France) where the ETM occurs at spring and summer. Using an acoustic telemetry array, we show that trans-estuarine migration is inhibited during...
Tipo: Text
Palavras-chave: Connectivity; Hypoxic conditions; Acoustic telemetry; Estuarine migration; Allis shad.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00301/41212/40365.pdf

Caractérisation biologique et variation des captures de la grande alose (Alosa alosa) par unité d'effort sur le fleuve Adour (Pyrénées Atlantiques, France)
Provedor de dados: 5
Autores: Prouzet, Patrick; Martinet, Jean-pierre; Badia, Jacques.
The study of logbooks from commercial fishermen on the Adour River and commercial samples allowed characterization of the allis shad population (Alosa alosa L.) caught during the period 1988-91. A better knowledge of the influence of hydroclimatic factors (rate of river flow and intensity of tidal coefficient) on the catchability of the species in that never was also obtained. Allis shad are mainly recruited to this fishery from the beginning of April to the end of May: between 78 and 89 % depending on year. Males in the population were on average younger than females. However, at the same age, males were significantly smaller in size and in weight than females. These results reinforce the knowledge already obtained on French stocks in the Loire and...
Tipo: Text
Palavras-chave: Alosa alosa; Grande alose ou alose vraie; Clupéidés; Captures; Stock; Pêche; Âge; Débit fluvial; Courant de marée; Atlantique; Alosa alosa; Allis shad; Clupeidae; Catch; Fishing effort; Stock assessment; Age composition; Flow and tidal currents; Atlantic.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00188/29891/28336.pdf

Modèles loglinéaires pour l'étude des associations entre captures par unité d'effort et variables hydroclimatiques
Provedor de dados: 5
Autores: Badia, Jacques; Prouzet, Patrick.
In this paper we study associations between categorical variables. We present an approach based on loglinear modelling. A better knowledge of the influence of the intensity of tidal coefficient (cm) and of the rate of river flow (df) on catch per unit effort (cpue) of allis shad (Alosa alosa) was obtained. Analysis performed indicated that an increase of catch per unit effort is proportionally associated with the increase in the tidal coefficient. We also noted the influence of the rate of flow.
Tipo: Text
Palavras-chave: Modèle loglinéaire; Capture par unité d'effort; Variables environnementales; Alosa alosa; Grande alose ou alose vraie; Loglinear model; Catch per unit effort; Environmental variables; Alosa alosa; Allis shad.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00188/29889/28338.pdf

La peche maritime professionnelle dans l'estuaire de l'Adour en 2000. Importance economique et caracteristiques des captures de poissons migrateurs amphihalins.
Provedor de dados: 5
Autores: Prouzet, Patrick.
This technical report gives the characteristics of the estuarine professional fishing located in the lower course and at the mouth of Adour river during the fishing season 2000. The fishery statistics for all the migratory amphihaline species (excepted glass-eel) are recorded according to the calendar year. For the glass-eel landings, the statistics given are relative to the fishing season (November, 1, 1999-March, 31,2000). The 2000 fishing season is characterized by a medium level of landings around 50 metric tonnes, but a high turnover, the highest of the 1985-2000 series: 1.47 Meuros. An evaluation of the state of the main exploited species is given: Atlantic Salmon, Sea Trout, Allis Shad, Sea Lamprey and Eel (glass-eel and yellow eel). The catch...
Tipo: Text
Palavras-chave: Caractéristiques des captures et évolution des stocks; Anguille; Civelle; Lamproie marine; Grande alose; Truite de mer; Saumon atlantique; Espèce amphihaline; Statistique de pêche; Pêche professionnelle estuarienne; Catch characteristics and stock evolution; Yellow eel; Glass eels; Sea lamprey; Allis shad; Sea trout; Atlantic Salmon; Professional esturian fishing; Fish statistic; Amphihaline species.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/rapport-1577.pdf