Food restriction prior to release reduces precocious maturity and improves migration tendency of Atlantic salmon (<i>Salmo salar</i>) smolts

Vainikka, Anssi; Huusko, Riina; Hyvärinen, Pekka; Korhonen, Pasi; Laaksonen, Tapio; Koskela, Juha; Vielma, Jouni; Hirvonen, Heikki; Salminen, Matti

doi:10.1139/f2012-119

Cited by 40 publications

(57 citation statements)

References 55 publications

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“…The reason may have been that the effect of water discharge where fish at a lower energetic state appear more motivated to migrate and migrate faster compared with fish at a higher energetic state (Lans et al, 2011;Norrgård et al, 2014;Persson et al, 2018;Vainikka et al, 2012). The reason may have been that the effect of water discharge where fish at a lower energetic state appear more motivated to migrate and migrate faster compared with fish at a higher energetic state (Lans et al, 2011;Norrgård et al, 2014;Persson et al, 2018;Vainikka et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

The effect of physiological and environmental conditions on smolt migration in Atlantic salmon Salmo salar

Persson

Kagervall

Leonardsson

et al. 2018

Ecology of Freshwater Fish

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Hydropower development has negatively influenced Atlantic salmon (Salmo salar)populations. Compensatory hatchery-rearing programmes exist, but released fish suffer from high mortality that may be related to the lack of experience from natural environments in hatchery-reared smolts and their large body size and high energetic state. Here, we used acoustic telemetry to test how body size, energetic state, and the environmental conditions of the river affect migration in hatchery-reared smolts.The study was conducted in three consecutive years between 2011 and 2013 in the lower part of the River Umeälven, Sweden. For individual fish, there was no effect of body size but the energetic state of the fish had a negative effect on sea entry. The most important factor affecting sea entry rate was the water discharge in the old river bed that differed among years. Smolts were more likely to enter the sea in years when the discharge was high or when the discharge increased substantially shortly after release. Hatchery-reared fish had higher migration speed at a slower flowing section compared with a faster flowing section, which was likely a result of large hesitation to enter the rapid section. The increase in water discharge led to an increase in fish migration speed disproportional to the increase in water velocity. Our results highlight the importance of water discharge for the smolts during smolt migration, and we argue that concern should be given to migrating fish when managing regulated rivers. K E Y W O R D Sbody length, condition factor, discharge, river migration, sea entry, water velocity

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Section: Discussionmentioning

confidence: 99%

The effect of physiological and environmental conditions on smolt migration in Atlantic salmon Salmo salar

Persson

Kagervall

Leonardsson

et al. 2018

Ecology of Freshwater Fish

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show abstract

“…The reader collected data non-stop during the study period and a higher number of detections indicate higher migration intensity. A similar circular migration-pool setup has successfully been used in earlier studies of migration behaviour in Atlantic salmon with regards to swimming intensity and speed, and motivation to migrate5254555657. After the experiment, all fish were released into the Ume River.…”

Section: Methodsmentioning

confidence: 99%

GABAergic anxiolytic drug in water increases migration behaviour in salmon

et al. 2016

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Migration is an important life-history event in a wide range of taxa, yet many migrations are influenced by anthropogenic change. Although migration dynamics are extensively studied, the potential effects of environmental contaminants on migratory physiology are poorly understood. In this study we show that an anxiolytic drug in water can promote downward migratory behaviour of Atlantic salmon (Salmo salar) in both laboratory setting and in a natural river tributary. Exposing salmon smolt to a dilute concentration of a GABAA receptor agonist (oxazepam) increased migration intensity compared with untreated smolt. These results implicate that salmon migration may be affected by human-induced changes in water chemical properties, such as acidification and pharmaceutical residues in wastewater effluent, via alterations in the GABAA receptor function.

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“…The wire net gates between the sections A-B and B-C were equipped with two PIT antennas, one at both sides of each gate. The antennas were connected to computers that recorded signal detections nine times in a second (9 s −1 ; see Vainikka et al 2012b for details). The individual position in each of the zones was calculated at 1-min precision using the PIT Data: Software for analyzing data from PIT tags (http://www.pitdata.net).…”

Section: Behavioural Measurementsmentioning

confidence: 99%

Behavioural variation in Eurasian perch populations with respect to relative catchability

et al. 2015

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Animal personalities, i.e. consistent individual differences in behaviour, are currently of high interest among behavioural and evolutionary biologists. The topic has received increasing attention also in fisheries science because selective harvesting of certain behavioural types might impose fishing-induced selection on personality. Here, we ice-fished wild Eurasian perch (Perca fluviatilis) from three native populations and investigated whether differences in relative catchability would explain behavioural differences observed in experimental conditions. We inferred relative catchability differences indirectly by fishing each location first with generally inefficient artificial bait and then by more efficient natural bait. The captured, individually tagged fish were tested in groups for their exploration tendency, activity and boldness under authentic predation risk in semi-natural stream channels. Fish that were easily captured first with artificial bait expressed fast exploration and acute activity, whereas the fish captured with natural bait showed less active and explorative behaviour. Differences in relative catchability did not explain variation in boldness or body size. In conclusion, we found that (1) Eurasian perch differing in relative catchability differ in certain behavioural traits, (2) fast explorers are more common among fish that get easily caught compared to fish that are more difficult to catch, (3) relative catchability explains more behavioural variation in a novel environment than in a familiar one and (4) selectivity of recreational angling on fish behaviour may depend on applied angling method and the effort spent on each location.

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Food restriction prior to release reduces precocious maturity and improves migration tendency of Atlantic salmon (Salmo salar) smolts

Cited by 40 publications

References 55 publications

The effect of physiological and environmental conditions on smolt migration in Atlantic salmon Salmo salar

The effect of physiological and environmental conditions on smolt migration in Atlantic salmon Salmo salar

GABAergic anxiolytic drug in water increases migration behaviour in salmon

Behavioural variation in Eurasian perch populations with respect to relative catchability

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