References of "Ecology of Freshwater Fish"
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See detailThe influence of environmental factors on the upstream movements of rheophilic cyprinids according to their position in a river basin
Benitez, Jean-Philippe ULiege; Ovidio, Michaël ULiege

in Ecology of Freshwater Fish (2017)

Throughout their lives, fish accomplish frequent movements between functional habitats that are often triggered by environmental signals. We aimed to determine if rheophilic cyprinids (barbel, Barbus ... [more ▼]

Throughout their lives, fish accomplish frequent movements between functional habitats that are often triggered by environmental signals. We aimed to determine if rheophilic cyprinids (barbel, Barbus barbus and chub Squalius cephalus), living in different places of the same river basin, may develop similar movement periodicities and react identically to environmental cues to carry out their spawning migration. We used the capture data of three modern fish passes that were monitored continuously during three consecutive years (2010 to 2012) in three rivers of the Meuse basin in Belgium. We captured 418 individuals at adult stage, and the capture number per species was greater (80%) in spring (during the spawning migration period). The spawning migration of the barbel occurred earlier (median = 122nd day of the year) and at lower temperatures (median = 14.5°C) in the lowland rivers compared to the upland river (140th day of the year and 18.4°C). For the barbel, migration initiation differed depending on the river but finished under similar environmental conditions. In contrast, for the chub, no significant difference between rivers was observed regarding spawning migration periodicity and environmental cues. Within the same river basin, rheophilic cyprinids demonstrate flexibility in their responses to environmental variables and may optimise the start date of migration to spawning grounds depending on their local environment and individual experiences. This phenomenon was more pronounced in the barbel, which has more specific ecological requirements. [less ▲]

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See detailThe behavioural repertoire of Arctic charr (Salvelinus alpinus (L.)) in captivity: A case study for testing ethogram completeness and reducing observer effects
Bolgan, Marta ULiege; O' Brien, Joanne; Gammell, Martin

in Ecology of Freshwater Fish (2015), 25(2), 318-328

In the last 20 years, research has been directed towards possible differences in the mating behaviour of species belonging to the Salmonidae family that may reproductively isolate wild populations from ... [more ▼]

In the last 20 years, research has been directed towards possible differences in the mating behaviour of species belonging to the Salmonidae family that may reproductively isolate wild populations from escaped hatchery or farmed fish. Despite these studies, a detailed description of the overall behavioural repertoire of Salmonidae species from wild and farmed environments is still lacking. Furthermore, although Arctic charr has been described as the most variable between all vertebrate species, possible behavioural plasticity outside of the breeding season has not been widely investigated, and a complete ethogram for Arctic charr not in breeding condition is currently unavailable. This study presents the first complete ethogram of captive Arctic charr behaviour outside of the breeding season. The completeness of this ethogram was validated based on the Behavioural Accumulation Curves methodology, a reliable and easy to use tool for assessing the best compromise between sampling effort and ethogram completeness. Additionally, a new way of presenting an ethogram has been proposed and validated using a dichotomous key to describe behaviour types. This proved to be a more effective operational tool for identifying Arctic charr behaviour than the ethogram. The dichotomous key of behaviour led to a significantly less ambiguous identification of behavioural units, thus reducing observer, recording errors and enhancing accuracy. This study therefore represents an effective step forward to a more in-depth and rigorous comparison of Arctic charr behavioural adaptation between and within artificial and natural settings. © 2016 John Wiley & Sons A/S. [less ▲]

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See detailEscapement success and patterns of downstream migration of female silver eel Anguilla anguilla in the River Meuse
Verbiest, Hilde; Breukelaar, André; Ovidio, Michaël ULiege et al

in Ecology of Freshwater Fish (2012), 21

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See detailBrown trout fry move inshore at night: a choice of water depth or velocity?
Bardonnet, A.; Poncin, Pascal ULiege; Roussel, J. M.

in Ecology of Freshwater Fish (2006), 15(3), 309-314

The instream positions of brown trout fry differ between daylight and darkness. According to field and laboratory observations, recently emerged 0+ brown trout use shallow and slow-flowing areas close to ... [more ▼]

The instream positions of brown trout fry differ between daylight and darkness. According to field and laboratory observations, recently emerged 0+ brown trout use shallow and slow-flowing areas close to the bank at night and tend to move off-shore during daylight. In laboratory channels, we tested whether the use of habitats close to the river bank could be attributed to a choice of either water depth or velocity. In two complementary experiments, emerging brown trout alevins were given the choice of using shallow-slow or deep-swift habitats (experiment 1), and deep-slow or shallow-swift habitats (experiment 2). At night, a persistent preference for the shallow habitats was displayed, regardless of velocity. It was concluded that swim-up brown trout fry respond to shallowness rather than ambient low water velocity when selecting habitats close to the bank at night. The behavioural significance of this result and implications for river management are discussed. [less ▲]

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