Abstract
Site attachment and the ability to maintain hydromineral balance in a hypotonic medium permit juvenile salmonids to live in a riverine environment. Abandonment of such adaptations results in downstream emigration. Numerous morphological and physiological changes have been associated with this seasonal emigratory stage (collectively called smoltification); however, the motivation for the migration is not understood. The seasonality of the migration implies developmental synchrony achieved through perception of photoperiod or thermoperiod change, via the hypothalamo-pituitary target-organ axies. As regulators of hydromineral balance prolactin and corticosteroid hormones are likely to play a prominent role. In this context Meier’s two-oscillator model of migratory behaviour regulation (Meier and Fivizzani 1980), expressed in the seasonal relative phase-changes of the circadian rhythms of these two hormones, is a hypothesis worthy of testing with young salmon. Intraspecific stock discreteness implies genetic control over such phase relationships and needs investigation. Finally, inhibition of emigration through physiological competition by sexual maturation should throw further light on the regulatory mechanism.
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Thorpe, J.E. (1984). Downstream Movements of Juvenile Salmonids: A Forward Speculative View. In: McCleave, J.D., Arnold, G.P., Dodson, J.J., Neill, W.H. (eds) Mechanisms of Migration in Fishes. NATO Conference Series, vol 14. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2763-9_24
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