A critical review of surgery techniques for implanting telemetry devices into the body cavity of fish

Conference (1996, August)

Based on literature survey and personal experience, this paper presents a critical review of surgery procedures to implant telemetry devices (transmitters, transponders) into the body cavity of fish ... [more ▼]

Based on literature survey and personal experience, this paper presents a critical review of surgery procedures to implant telemetry devices (transmitters, transponders) into the body cavity of fish species. It debates on the relative adequacy of techniques which may compromise or enhance tagging success with respect to fish health and transmitter retention: anaesthesia, incision (position and length of incision), transmitter features (size and weight ratios, coating), ways of closing the incision (stitches, staples, adhesives), prophylaxy, pre- and postoperative care. Behavioural and physiological biases originating from tagging or internal presence of the transmitter are reviewed, evaluated and integrated to determine the actual duration of the post-operative perturbation and subsequent validation of telemetry data. [less ▲]

A preliminary telemetry investigation on the obstacles to anadromous Salmonids migration in spawning streams of the Belgian Ardennes (river Meuse bassin)

in Leclerc, Michel (Ed.) Proceedings of the Second IAHR Symposium on Habitat Hydraulics, Ecohydraulique 2000 (1996)

In the course of the 'Meuse Salmon 2000' programme aiming at the restoration of the Atlantic salmon Salmo salar and sea trout Salmo trutta in the River Meuse Basin, most large dams are progressively ... [more ▼]

In the course of the 'Meuse Salmon 2000' programme aiming at the restoration of the Atlantic salmon Salmo salar and sea trout Salmo trutta in the River Meuse Basin, most large dams are progressively equipped with fishways to restore the free circulation of spawners between the North Sea and the first major spawning streams, the River Ourthe and its tributaries. Spawners entering the River Ourthe would still be confronted to so-called minor obstacles, aiming at water regulation for tourism purposes but of which the actual impact on fish migration has never been investigated. In order to test for the actual free-circulation of salmonid spawners in the upper River Ourthe and to locate potential spawning grounds, a probe fish (489 mm FL male sea trout) was tagged with an intraperitoneally implanted radio-transmitter. From the 18th of ovember 1995 onwards, the trout was tracked in a part of the river (44 km upstream of the confluence) which was thought to be devoid of any major obstacle to fish migration. Three days after its release, the trout had migrated over 6 km up to a small weir (1.8 m high). During four consecutive days, the trout was consistently located downstream of the weir but no successful climbing was observed, reflecting the poor efficiency of the central fishpass under dry weather conditions during summer and autumn. The trout then settled in a deep run habitat, 150 m downstream of the weir and no upstream excursion was recorded until the first major rise of water level, four weeks later, even when the weir was opened for water regulation purposes. When the water level was maximum (24th of December), the trout moved upstream of the weir and migrated over 28 km during the next 72 hours up to a spot identified as a potential spawning redd from habitat features, and where it was consistently located till the 31st of December. These results, though most preliminary, clearly indicate that even minor obstacles may cause a substantial lag in trout migration of which the impact on spawning success remains to be determined. Since similar minor man-made obstacles are most frequent in the salmonid spawning streams of the Belgian Ardennes, it is thus uncertain that migratory trout having successfully climbed the major obstacles since the North Sea would find their way to the spawning redds. As a corollary, it is suggested that more detailed case studies should be undertaken, ideally via the use of telemetered probe-fish, in order to provide management policies that would represent a suitable compromise between users of water resources with apparently conflicting interests (water regulation, tourism, nature conservancy). [less ▲]

Behavioural and endocrine study of Oreochromis aureus, with special reference to sex-reversed males.

Poster (1995)

Comparative study of the behaviour and the hormonal levels of females and sex reversed females Oreochromis aureus (Steindachner, 1864) (Pisces: Cichlidae).

Poster (1994, November)

Comparison of the behaviour of females an sex reversed females tilapias Oreochromis aureus in aquaria.

Poster (1994)