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Timing and duration of constant light affects rainbow trout (Oncorhynchus mykiss) growth during autumn-spring grow-out in freshwater
- Source :
- Aquaculture Research. 40:1551-1558
- Publication Year :
- 2009
- Publisher :
- Hindawi Limited, 2009.
-
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 with 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.
- Subjects :
- endocrine system
animal structures
growth
animal diseases
Aquatic Science
Biology
photoperiod
digestive system
Animal science
Aquaculture
Spring (hydrology)
timing
medicine
Juvenile
Constant light
photoperiodism
geography
geography.geographical_feature_category
urogenital system
business.industry
duration
Aquatic animal
Fishery
Rainbow trout
Oncorhynchus mykiss
Photoperiodism
medicine.symptom
business
Weight gain
Subjects
Details
- ISSN :
- 13652109 and 1355557X
- Volume :
- 40
- Database :
- OpenAIRE
- Journal :
- Aquaculture Research
- Accession number :
- edsair.doi.dedup.....1ef0972d913e6906d0d7f710f163f5ab