Opvolging van het visbestand in de Zeeschelde: Viscampagnes 2014
Breine, J.; Van Thuyne, G. (2015). Opvolging van het visbestand in de Zeeschelde: Viscampagnes 2014. Rapport van het Instituut voor Natuur- en Bosonderzoek, INBO.R. 2015.6977363. Instituut voor Natuur- en Bosonderzoek: Brussel. 65 pp.
Deel van: Rapport van het Instituut voor Natuur- en Bosonderzoek. Instituut voor Natuur- en Bosonderzoek: Brussel. ISSN 1782-9054, meer
In 2014 researchers of the Research Institute for Nature and Forest (INBO) performed three fish surveys in the Zeeschelde estuary.Fish assemblages were surveyed in six locations nearby the banks during spring, summer and autumn using two paired fyke nets for two successive days.In total 32 fish species were caught. In Zandvliet (mesohaline zone) we caught the highest number of individuals and species. Highest numbers of fish were caught in autumn in Branst and Kastel (freshwater zone). In spring and summer highest numbers were caught in Zandvliet.The analysis of all surveys performed in spring and autumn indicated that the fish assemblage in the mesohaline zone differs from that in the other zones. The fish assemblage in the other zones does not differ that much. Overall, 1995-2014 campaigns, there is a strong difference between spring and autumn catches.The ecological status of freshwater zone remained in a “Good Ecological Potential”. Although the EQR for oligohaline zone increased its status remained “poor”. In 2014 the mesohaline zone had a “moderate” status.The presence of different life stages of several fish species is an indication that some use it as spawning and/or nursery grounds. The Zeeschelde fulfils its role as a migration route for anadromic species such as twaite shad and smelt.Volunteers caught 47 species in 2014; 35 in the mesohaline zone, 20 in the oligohaline zone and 24 in the freshwater part.In the Rupel, a tributary of the Zeeschelde, 13 fish species were caught in 2014.