Influence of Photoperiod on Growth of Juvenile Atlantic Salmon and Development of Salinity Tolerance during Winter–Spring
- 1 July 1990
- journal article
- Published by Oxford University Press (OUP) in Transactions of the American Fisheries Society
- Vol. 119 (4) , 689-697
- https://doi.org/10.1577/1548-8659(1990)119<0689:iopogo>2.3.co;2
Abstract
Underyearling Atlantic salmon Salmo salar were subjected to extended day length beginning in early August or early September; the photoperiod was 18 h light and 6 h darkness (LD 18:6) during August-October (A–O), September-October (S–O), and September–November (S–N). A control group experienced simulated natural photoperiod. The LD 18:6 regimes stimulated growth and, by fate October, treatment fish were significantly larger than the controls. The 3-month S–N and A–O regimes promoted growth more effectively than the 2-month S–O regime, Stimulation of growth from August through October was not as effective as that from September through November. Thus, duration (2 versus 3 months) and time of onset of extended day length and return to simulated natural photoperiod appeared to influence photostimulation of growth. Bimodality in length-frequency distribution in the S–O and control groups was clearly developed by mid-December. Photostimulation of growth and continued entry offish into the upper modal ...Keywords
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