Research output

Article in Journal ()

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

Alternative title

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.

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

Subject headings
Photoperiodism; Rainbow trout

StatusPublished
AuthorsTaylor John, Migaud Herve
Publication date09/2009
Publication date online01/06/2009
PublisherWiley-Blackwell
ISSN 1355-557X
LanguageEnglish

Journal
Aquaculture Research: Volume 40, Issue 13 (2009-09)

© University of Stirling FK9 4LA Scotland UK • Telephone +44 1786 473171 • Scottish Charity No SC011159
My Portal