PHOTO SECTION

Photo 1 - Trainees, trainers and distinguished persons who attended the opening ceremony of the pilot workshop at the IRD centre in Bamako.

Photo 2 - Telemetry tags. In the centre: radio transmitter with external antenna (weight: 5.5 g) for intraperitoneal implantation. On the right: Data storage tag (DST: weight: 8 g) for dorsal fixation. On the left: Petersen disks for dorsal fixation of the data storage tag.

Photo 3 - Inserting a radio transmitter with external antenna into the peritoneal cavity of a tilapia.

Photo 4 - Fixing a data storage tag to the dorsal area of the tilapia shown in photo 3. The attachment wires go through the dorsal muscles and are secured on the opposite side, Petersen disks are added in order to reduce the risk of cutting the muscles.

Photo 5 - The tilapia with its data storage tag.

Photo 6 - Radio-tracking team detecting the precise direction of the signal by “null-peaking” (i.e. search for the weakest signal) using a loop antenna with a turning glass compass. In the background, the theodolite used to establish the cartography of the Sélinguéni pond.

Photo 7 - Radio-tracking team on the shores of the Sélinguéni pond, measuring the direction of the strongest signal with a type Yagi antenna from one of the reference points located previously (wooden pole with a two-coloured banner).

Photo 8 - Participants training in suturing and surgery.

Photo 9 - Concertation of participants before “fox-hunting” consisting of finding radio transmitters spread over the irrigated perimeter of Sélingué.

Photo 10 - Setting up an automatic biotelemetry station for the continuous recording of the activity of fish released into the Sélinguéni pond. The station comprises a computer (on the right), a receiver (in the centre), a battery (on the left) and an upright loop antenna (extreme left).

Photo 11 - Dorsal attachment of a data storage tag to a catfish: recovery at the end of the workshop of tagged fish and examination of any injuries made by the tagging process.

Photo 12 - Abdominal surgery in a tilapia: examination of any injuries made by the tagging process.

Photo 13 - Recovering information recorded in a data storage tag: opening the data storage tag by cutting the external plastic cover.

Photo 14 - Analysing data in the computer room set up in the ODRS conference room in Sélingué.

The Pilot Workshop on the Application of Biotelemetry to Fish Studies for the Managementof Inland Fisheries in West Africa was held on the premises of the Office for RuralDevelopment of Sélingué (ODRS) in Sélingué, Mali, from 29 January to 10 February 2001.The workshop was organized by the Institute of Research for Development (IRD, France),and in particular by its Bamako-based centre, in cooperation with the Institute of RuralEconomy of Mali (IER) and the Office for Rural Development of Sélingué, with the supportof the University of Liège (Belgium) and the Food and Agriculture Organization of theUnited Nations (FAO). The participants came from Benin, Burkina Faso, Côte d’Ivoire,Guinea and Mali. The aim of the workshop was to improve understanding of, anddisseminate, biotelemetry, which is a very useful tool for the collection of the more preciseinformation essential for improved sustainable management of aquatic resources.

ISBN 92-5-104641-7
ISSN 0429-9337

TR/M/Y1972E/1/4.02/1450