Skip header navigation

University of Stirling

×

Article

Timing and duration of constant light affects rainbow trout (Oncorhynchus mykiss) growth during autumn–spring grow-out in freshwater

Citation
Taylor J & Migaud H (2009) Timing and duration of constant light affects rainbow trout (Oncorhynchus mykiss) growth during autumn–spring grow-out in freshwater. Aquaculture Research, 40 (13), pp. 1551-1558. https://doi.org/10.1111/j.1365-2109.2009.02260.x

Abstract
Photoperiod enhancement of growth is becoming an area of increasing interest as a means of enhancing rainbow trout production efficiency in commercial practice. This paper examines the possible implications of shortening periods of constant light (LL) exposure on rainbow trout growth during autumn-spring grow out under ambient water temperatures in freshwater to portion size. Triplicate groups of juvenile all-female rainbow trout were permanently exposed to LL in October, November, December or January. Growth was monitored and compared to those maintained under a simulated natural photoperiod (SNP) until the following May. Permanent exposure to LL (all treatments) resulted in significantly greater weight gain of rainbow trout than those under SNP. Furthermore, greatest growth was achieved when fish were left permanently exposed to LL from October. These findings suggest there may be implications for fish farmers if the period of photoperiod exposure is reduced, or timing of application is not considered with regards to ambient water temperatures.

Keywords
photoperiod; timing; growth; duration; Oncorhynchus mykiss; Photoperiodism; Rainbow trout

Journal
Aquaculture Research: Volume 40, Issue 13

StatusPublished
Author(s)Taylor, John; Migaud, Herve
Publication date30/09/2009
Publication date online01/06/2009
URLhttp://hdl.handle.net/1893/1690
PublisherWiley-Blackwell
ISSN1355-557X
Scroll back to the top