Behavioural effects of surgically implanting transponders in Europe eel, Anguilla anguilla

作者: H.V. Winter , H.M. Jansen , U. Schwevers , B. Adam

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摘要: The applicability of using transponders (Nedap TrailTM) to tag European eel Anguilla anguilla (L. 1758) during their silver stage, was tested in a controlled tank experiment. Most studies on effects implanted radio tags focus the impact mortality, disease, wound healing and growth. In this experiment we also measured individual activity continuously, which allowed detect more subtle behaviour as well. total 40 eels (680-1685 g) were anaesthetized injected with micro PIT-tag. 20 these, dummy similar shape (cylindrical, 14x63 mm), weight (26.5 g air, 16.0 water), volume (9.5 cm3) surface (glass) Nedap-transponders surgically body cavity. All placed Migromat®-tank five compartments connected openings that free movement between compartments. Each opening covered by an antenna recording passages. Because open, had transparent lids flowed river water, could respond ‘natural’ environmental stimuli, e.g. water temperature, turbidity, light moon phase. ended after 11 weeks (October-December). There no significant difference mortality rate control (15%) experimental group (10%). closed wounds none shed, nor any sign expulsion observed. both groups one PIT-tag lost. Individual level remaining 38% lower (n=17) than (n=16), indicating at least some effect implanting eel. was, however, timing activity, neither entire period diurnal. Consequences for interpretation field telemetry experiments are discussed. 287 Spedicato, M.T.; Lembo, G.; Marmulla, G. (eds.) Aquatic telemetry: advances applications. Proceedings Fifth Conference Fish Telemetry held Europe. Ustica, Italy, 9-13 June 2003. Rome, FAO/COISPA. 2005. 295p.

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