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Title: Effect Of Photoperiod On Plasma Thyroxine Hormone Level Of Mirror Carp (Cyprinus Carpio) Raised At A Low Water Temperature In A Controlled Environment 
Author: Hisar, Sükriye Aras; Kirim, Birsen; Bektas, Serdar; Altinkaynak, Konca; Hisar, Olcay; Yanik, Telat
Date: 2005
Publisher: Israeli Journal of Aquaculture - BAMIGDEH
Citation: Hisar, S.A., Kirim, B., Bektas, S., Altinkaynak, K., Hisar, O., & Yanik, T. (2005). Effect Of Photoperiod On Plasma Thyroxine Hormone Level Of Mirror Carp (Cyprinus Carpio) Raised At A Low Water Temperature In A Controlled Environment. The Israeli Journal of Aquaculture - Bamidgeh, 57(1), 19-24.
Abstract: The objective of this study was to examine the effects of various lighting regimes on the plasma thyroxin hormone (T4) level of mirror carp (Cyprinus carpio). The carp were kept at the low tem- perature of 9°C to eliminate any influence of water temperature on feed intake, growth, and the hormone level. Treatments were 8 h light:16 h dark, 12 h light:12 h dark, and 16 h light:8 h dark. Plasma thyroxin levels were measured every four weeks for 12 weeks. The levels were signifi- cantly higher (p<0.05) in the groups exposed to 8 or 12 h light than in the group exposed to 16 h. The T4 levels significantly dropped with time in all photoperiods.
Series/Report No.: The Israeli Journal of Aquaculture - Bamidgeh
Pages/Duration: 6 pages
ISSN: 0792-156X
URI: http://hdl.handle.net/10524/19126
Keywords: mirror carp, photoperiod, thyroxin hormone, weight gain
LC Subject Headings: Fish culture--Israel--Periodicals.
Fish culture--Periodicals.
Aquaculture--Israel--Periodicals.
Aquaculture--Periodicals.

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