https://popups.lib.uliege.be/2984-0317/index.php?id=1971 Publications de Auteurs Lucien Hanon fr 0 https://popups.lib.uliege.be/2984-0317/index.php?id=1970 During the period of highest density of Black Grouse in the Hautes-Fagnes Nature Reserve, Belgium, we have used stuffed hens in order to test the territorial and sexual tactics of cocks, an experiment already imagined by KRUIJT in the Netherlands. By the way, we have observed that the stuffed hen, keeping the crouching posture which means sollicitation for the copulation, has a supernormal value. Territorial males try to mount the model each time it passes through their territories. When we allow a male to persist in his attempt by stopping the hen in his territory, he proceeds mounting, taking the neck feathers of the hen in his beak, beating the wings and ensuring the cloacal contact for minutes. If this takes place a few meters near the terrltorial borders, other males soon trespass them, invade the territory and disrupt the copulation taking place there. A territory ensures sufficient quietness to succeed in copulating provided that the whole copulation takes only a few seconds. If it takes more time, the inhibition preventing the neighbours to trespass the borders comes to an end. These data have been authentified by filming (1980). Une poule naturalisée dans l'attitude accroupie de sollicitation à l'accouplement est traînée par un jeu de poulies d'un territoire à l'autre sur une arène de parade de Tétras lyres. Lorsqu'elle passe dans son territoire, chaque coq la courtise et tente de la monter. Comme 1e leurre tient la position accroupie, le coq prolonge anormalement la monte et la tentative de copulation. Dès lors, l'inhibition qui empêchait les voisins de franchir les frontières tombe et ceux-ci envahissent le territoire, bousculent le couple, interrompent la tentative. Cette expérience démontre que le territoire ne peut assurer la tranquillité nécessaire à la cour et à la copulation qu'à la condition que cette dernière ne dure que quelques secondes. Ces observations ont été authentifiées par des prises de vues cinématographiques, diffusées depuis 1980. Fri, 23 Feb 2024 14:48:28 +0100 Fri, 08 Mar 2024 13:25:16 +0100 https://popups.lib.uliege.be/2984-0317/index.php?id=1970 https://popups.lib.uliege.be/2984-0317/index.php?id=1215 This video film gets a general view of the main aspects of the reproduction biology of freshwater fishes living in Belgian Rivers. Attention is drawn on to three species : the grayling Thymallus thymallus ; the barbel Barbus barbus and the bream Abramis brama. Other fish species are also brielly considered : roach, carp and perch. The spawning sites are presented, followed by a detailed description of the sexual behaviour. As a general rule, each male grayling spawns with one female. In some cases, sneaking males can take part in the spawning act too. As far as barbels and breams are concerned, groups of males spawn with one female in the first case whereas reproduction resorts to the arena system in the latter. The interest of conservation and restoration of the spawning sites are presented through two exemples : management of a salmonid River and use of artificial spawning grounds. Thu, 01 Feb 2024 10:38:15 +0100 Thu, 14 Mar 2024 16:46:44 +0100 https://popups.lib.uliege.be/2984-0317/index.php?id=1215 https://popups.lib.uliege.be/2984-0317/index.php?id=1067 In Belgian Meuse River basin, all the migrating fish were disappeared at the beginning of the last century. The most fabulous salmonid fish: the atlantic salmon (Salmo salar) was completely disappeared in 1935. In 1983, sea trouts were discovered in the Meuse basin, allowing to consider salmon restoration as possible. This was realized and in 2002 first breeders were caught in a fish pass on the River Meuse. This film overviews the different steps of the restoration of the salmon in the Belgian Meuse River basin. Fertilized eggs from Scotland were reared in an experimental fishfarm for restocking purposes. Scientific studies were undertaken to assess the adaptation of stocked salmon parrs in the wild (habitat studies by means of electrofishing or diving, behaviour studies, capture of migrating smolts, radio-tracking). Fish ways were also studied and improved in order to allow migrating movements. The case study of other migrating fish as eels was also discussed. Wed, 31 Jan 2024 15:07:44 +0100 Thu, 14 Mar 2024 16:47:13 +0100 https://popups.lib.uliege.be/2984-0317/index.php?id=1067