Results 281 to 290 of about 2,123,623 (331)
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Less anxious salmon smolt become easy prey during downstream migration
Science of The Total Environment, 2019Hatchery-reared salmon smolt used for supplementary stocking often display poor migration behavior compared to wild smolt, which reduces the success of this management action. Oxazepam, an anxiolytic drug, has been shown to intensify salmon smolt migration in mesocosm experiments, and treatment with this drug has, therefore, been suggested as a ...
Jonatan Klaminder +6 more
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Retinal Responses of Pink Salmon associated with its Downstream Migration
Nature, 1959THE seaward migration of juvenile Pacific salmon is usually nocturnal and confined to a relatively brief portion of the night1. It has been suggested that “as the light intensity falls rheotactic responses, which are to a large degree dependent on vision, fail, and these fish pass down stream in shoals.
M A, ALI, W S, HOAR
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Flow design of guiding device for downstream fish migration
River Research and Applications, 2010AbstractDownstream migrating smolt must be guided around hydropower plants to avoid fish mortality due to the turbines. In Piteå River, which is already regulated, open spillways serve this purpose but few fish find this route. Hence, action must be taken to enhance downstream fish migration.
Lundstrom, T S +2 more
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Downstream-migrating fluvial point bars in the rock record
Sedimentary Geology, 2016Abstract Classical models developed for ancient fluvial point bars are based on the assumption that meander bends invariably increase their radius as meander-bend apices migrate in a direction transverse to the channel-belt axis (i.e., meander bend expansion).
GHINASSI, MASSIMILIANO +3 more
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Downstream fish migration from two regulated lakes monitored by hydroacoustics
Fisheries Management and Ecology, 1998The migration of fish from two large northern Finnish lakes to their outflowing rivers was studied by echosounding and exploratory fishing. Both lakes are regulated for hydroelectric purposes. In both rivers, two sonar stations with stationary up‐ and down‐looking transducers were used to collect data for one year.
null VEHANEN +2 more
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Downstream migration of radio-tagged silver eels
No abstracts are to be cited without prior reference to the author.The catadromous eel leave the feeding grounds in fresh water during late autumn to migrate to the spawning grounds in the Sargasso Sea. During the last decades the European eel population Anguilla anguilla (L.) has decreased to a historic low population level (Dekker 2004).Pedersen, Michael I., Jepsen, Niels
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Hot Streak and Vane Coolant Migration in a Downstream Rotor
Volume 6: Turbomachinery, Parts A, B, and C, 2008This paper describes a method of improving the cooling of the hub region of high-pressure turbine (HPT) rotor by making better use of the unsteady coolant flows originating from the upstream vane. The study was performed computationally on an engine HPT stage with representative inlet hot streak and vane coolant conditions.
Jonathan Ong, Robert J. Miller
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Downstream Migration of Silver-Phase Anguillid Eels
2003Downstream migration of adult anguillid eels in freshwater habitats marks the end of a long, generally slow growth phase, abandonment of a home range, and initiation of a seaward spawning migration. Although different species of Anguilla exhibit variation in characteristics of this migratory phase, some generalized traits in migration are common to ...
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The random downstream migration of molecules in chromatography
Journal of Chemical Education, 1958This articles outlines a theory of chromatography based on the classic random-walk problem that involves more physical intuition and less difficult mathematics than current theories.
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Downstream migration of juvenile fish in the Krasnaya River (Vietnam)
Journal of Ichthyology, 2010The first material is presented on downstream migration of fish juveniles in the Krasnaya River, one of the largest rivers in South-East Asia. The spatial-temporal structure of distribution of downstream-migrating fish juveniles in the Krasnaya River has traits usually characteristic of migration in rovers with turbid water.
V. K. Nezdolii +4 more
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