scholarly journals Experimental field study on the migratory behaviour of glass eels (Anguilla anguilla) at the interface of fresh and salt water

2007 ◽  
Vol 64 (7) ◽  
pp. 1396-1401 ◽  
Author(s):  
Tammo P. Bult ◽  
Willem Dekker
Keyword(s):  
Field Study ◽  
Salt Water ◽  
Anguilla Anguilla ◽  
Migratory Behaviour ◽  
Glass Eel ◽  
Experimental Field ◽  
Tidal Stream ◽  
Glass Eels ◽  
Selective Tidal Stream Transport ◽  
Stream Transport

Abstract Bult, T. P., and Dekker, W. 2007. Experimental field study on the migratory behaviour of glass eels (Anguilla anguilla) at the interface of fresh and salt water. – ICES Journal of Marine Science, 64: 1396–1401. European eels (Anguilla anguilla) in the glass eel phase migrate using ocean currents and selective tidal stream transport. Conventional fish ladders installed at the interface of marine and fresh water, however, require the fish to swim upstream actively. We question the efficiency of these fish ladders for glass eel immigration, and propose a simple siphon over migration barriers, restoring the original selective tidal stream transport. A conventional trap and our siphon were tested concurrently at two sluice complexes in The Netherlands (Tholen, Nieuwe Statenzijl) in spring 2005. In all but one case, the siphon caught more glass eels than the trap, as well as more sticklebacks and other species. Clearly, the natural immigration process can be restored fairly easily and at low cost and with low intrusion levels of salt. Follow-up studies should focus on optimization, and the effect of a passage on the hinterland stock.

scholarly journals Selective tidal stream transport in silver European eel (Anguilla anguilla L.) – Migration behaviour in a dynamic estuary

2018 ◽  
Vol 213 ◽  
pp. 260-268 ◽  
Author(s):  
Pieterjan Verhelst ◽  
Stijn Bruneel ◽  
Jan Reubens ◽  
Johan Coeck ◽  
Peter Goethals ◽  
...  
Keyword(s):  
Anguilla Anguilla ◽  
European Eel ◽  
Migration Behaviour ◽  
Tidal Stream ◽  
Selective Tidal Stream Transport ◽  
Stream Transport

Challenges to quantifying glass eel abundance from large and dynamic estuaries

2017 ◽  
Vol 75 (2) ◽  
pp. 727-737 ◽  
Author(s):  
Sarah Walmsley ◽  
Julie Bremner ◽  
Alan Walker ◽  
Jon Barry ◽  
David Maxwell
Keyword(s):  
Large Scale ◽  
Anguilla Anguilla ◽  
Commercial Fishing ◽  
European Eel ◽  
Estuarine System ◽  
Glass Eel ◽  
The North ◽  
Adequate Sampling ◽  
South Shore ◽  
Glass Eels

Abstract European eel Anguilla anguilla recruitment into the rivers of the northeastern Atlantic has declined substantially since the 1980s. Monitoring of recruiting juveniles, or glass eels, is usually undertaken in small estuaries and rivers. Sampling of large-scale estuaries is rare, due to the size of the sampling area and the resources needed to provide adequate sampling levels. Here we describe surveys for glass eels in the UK’s largest estuarine system, the Severn Estuary/Bristol Channel. We sampled across a 20 km-wide stretch of the estuary in 2012 and 2013, using a small-meshed net deployed from a commercial fishing trawler, and the surveys yielded over 2500 glass eels. Eels were more abundant in the surface layer (0–1.4 m depth) than at depth (down to 8.4 m depth), were more abundant close to the south shore than along the north shore or middle of the estuary, and were more abundant in lower salinity water. Numbers were higher in the second year than in the first and eels were more abundant in February than April. The difficulties and logistics of sampling in such a large estuary are discussed, along with the level of resources required to provide robust estimates of glass eel abundance.

scholarly journals Migratory Behavior of Ovigerous Blue Crabs Callinectes sapidus: Evidence for Selective Tidal-Stream Transport

1998 ◽  
Vol 195 (2) ◽  
pp. 168-173 ◽  
Author(s):  
R. A. Tankersley ◽  
M. G. Wieber ◽  
M. A. Sigala ◽  
K. A. Kachurak
Keyword(s):  
Callinectes Sapidus ◽  
Migratory Behavior ◽  
Blue Crabs ◽  
Tidal Stream ◽  
Selective Tidal Stream Transport ◽  
Stream Transport

Rhythmic activity of migrating juvenile American eels Anguilla rostrata

1988 ◽  
Vol 68 (1) ◽  
pp. 81-91 ◽  
Author(s):  
Gail S. Wippelhauser ◽  
James D. McCleave
Keyword(s):  
River Estuary ◽  
Rhythmic Activity ◽  
Water Current ◽  
Anguilla Rostrata ◽  
Activity Rhythms ◽  
Tidal Water ◽  
Penobscot River ◽  
Tidal Stream ◽  
Glass Eels ◽  
Stream Transport

Glass eels of the American eel Anguilla rostrata (Lesueur) utilize selective tidal stream transport, a series of semidiurnal vertical migrations in phase with the tide, to migrate up the Penobscot River estuary, Maine, U.S.A., in the spring. Glass eels, freshly collected during their migration, exhibited rhythmic activity with circatidal periodicities when tested in groups in the presence of a water current under constant conditions in the laboratory. Freshly collected groups of eels which had already completed their migration through tidal water did not exhibit circatidal activity rhythms under the same conditions. The activity rhythms of groups of eels freshly caught in tidal water appeared to be entrained by a 12.5 h cycle of water current reversals, but not by a 10.0 h cycle of current reversals. In other entrainment experiments water collected on flood and ebb tides was alternately added to the experimental tanks every 5.0 h. Under these conditions groups of eels freshly caught in tidal water did not display any rhythmic activity. Only 2 of 100 glass eels, freshly collected from tidal and non-tidal water, which were tested individually in static tanks, exhibited rhythmic activity. The activity rhythms would allow an eel to time its vertical migrations in the estuary despite varying environmental conditions.

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