Out-of-season spawning of mountain trout (Salmo trutta macrostigma Dumeril, 1858) by artificial photoperiod manipulation
Abstract
The effects of artificial photoperiod manipulation on spawning time and hatchery success of 3+ old mountain trout (Salmo macrostigma) broodstock were investigated. Broodstock fish in the photoperiod group were exposed to constant long days (18L:6D), from February 1st until May 31st, 2013 and then to constant short days (8L:16D) starting from June 1st, 2013. The fish in the control group were exposed to natural light-dark regimes. Out-of-season milt was observed in males starting from August 15th. Out-of-season spawning of females started in August 30th and reached its peak level in September 13th. Mean values of absolute fecundity, relative fecundity, and egg size were found to be 1242.48±382.55 eggs/fish, 1148.76±336.91 eggs/kg and 4.14±0.19 mm respectively. Mean fertilization, eyeing, and hatching rates of out-of-season eggs were determined as 54.76%, 20.79%, and 12.56% respectively. Regardless of the fact that the mean fecundity of females in the photoperiod group and hatching success (egg diameter, fertilization, eyeing, and hatching rates) of out-of-season eggs were lower than those in the control group, the overall results demonstrate that that regulating spawning time and out-of-season spawning of mountain trout by the use of artificial photoperiod is possible.
Keywords
References
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Details
Primary Language
English
Subjects
-
Journal Section
Short Communication
Publication Date
June 12, 2017
Submission Date
November 21, 2016
Acceptance Date
February 10, 2017
Published in Issue
Year 2017 Volume: 34 Number: 2