Effects of light on trace elements and triiodothyronine levels in plasma of mirror carp (Cyprinus carpio)

• Published in: Biological trace element research Vol. 108; no. 1-3; pp. 147 - 154
• Main Authors: Ayik, Ozer, Hisar, Olcay, Gulcin, Ilhami, Aras-Hisar, Sukriye, Yanik, Telat
• Format: Journal Article
• Language: English
• Published: United States 2005
• Subjects: Animals; Carps - blood; Copper - blood; Iron - blood; Light; Magnesium - blood; Manganese - blood; Photoperiod; Temperature; Trace Elements - blood; Triiodothyronine - blood; Zinc - blood
• ISSN: 0163-4984; 0163-4984
• DOI: 10.1385/BTER:108:1-3:147

The changes of copper, zinc, iron, magnesium, manganese, and triiodothyronine as a result of short- and long-term isothermal exposure to light were determined in the plasma of mirror carp (Cyprinus carpio). Two groups of fish were subject to a 3-mo treatment that consisted of (1) 8 h of light followed by 16 h of darkness and (2) 16 h of light followed by 8 h of darkness at 25 degrees C. No significant changes were recorded between the two groups at the beginning of the study. After 3 mo, the triiodothyronine and elements levels as well as the growth rates of fish in the long-time exposure period were significantly higher than those in the short-time exposure (p<0.05).