Study ID 245

Migratory Fishes in the river Scheldt Trekvis

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Realm: Marine
Climate: Temperate
Biome: Temperate shelf and seas ecoregions
Central latitude: 51.058813
Central longitude: 4.265099
Duration: 4 years, from 2007 to 2010

2253 records

49 distinct species

Across the time series Rutilus rutilus is the most frequently occurring species

Citation(s):

Stevens, M. (2010) “Trekvis - Migratory fishes in the river Scheldt.” Research Institute for Nature and Forest (INBO). Available at: http://www.gbif.org/dataset/b2d0f29e-4614-4001-93c8-f651878a86d2, accessed 2014.

Methods

In the context of the Trekvis migratory fish project fykes are placed at a few locations in the river Scheldt and among the most important fish migration bottlenecks in the basin of the Scheldt. Every month traps placed 24 hours later retrieved. All fish are determinatie measured and weighed. Geographic Coverage: The Scheldt (Dutch Schelde French Escaut) is a 350 km long river in northern France western Belgium and the southwestern part of the Netherlands. Its name is derived from an adjective corresponding to Old English sceald shallow Modern English shoal Low German schol Frisian skol and Swedish sk?ll thin. Bounding Coordinates: 50.58 51.51 / 2.81 4.58 (min max Latitude / min max Longitude) Taxonomic Coverage: All species in this dataset are fishes (Actinopterygii Cephalaspidomorphi) except for the Chinese mitten crab (Eriocheir sinensis) which is an invasive arthropod and the common littoral crab (Carcinus maenas). The top 3 recorded species are Rutilus rutilus (27%) Gobio gobio (10%) and Anguilla anguilla (7%). Sampling Methods: The three sampling methods that were applied in this project (cooling water intertidal and subtidal fykes) proved to be complementary and each are useful to describe a different aspect of the migration of diadromous fishes. The volunteer network (intertidal fykes) has a high temporal and spatial resolution. Especially the catadromous species that use the estuary as a foraging and nursery area were caught in the intertidal fyke nets. Subadult shads and downstream migrating juvenile lampreys were only caught in the cooling water of the powerplant of Doel. In addition the fish monitoring of the cooling water in Doel started in 1991 which allows us to investigate long-term trends. The subtidal fyke nets that were deployed underneath the migration barriers proved to be efficient in catching the fishes during their spawning run. During their upstream migration anadromous fishes accumulate underneath the barriers where they can be caught in large numbers. migration of diadromous fishes data from the river Scheldt Unit of abundance = IndCountInt, Unit of biomass = NA