Effect of photoperiod on plasma thyroxine hormone level of mirror carp (Cyprinus carpio) raised at a low water temperature in a controlled environment

Hisar Ş. A., Kirim B., Bektaş S., Altinkaynak K., Hisar O., Yanık T.

ISRAELI JOURNAL OF AQUACULTURE-BAMIDGEH, cilt.57, sa.1, ss.19-24, 2005 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 57 Sayı: 1
  • Basım Tarihi: 2005
  • Dergi Adı: ISRAELI JOURNAL OF AQUACULTURE-BAMIDGEH
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.19-24
  • Anahtar Kelimeler: mirror carp, photoperiod, thyroxin hormone, weight gain, SALMON SALMO-SALAR, THYROID-HORMONES, FUNDULUS-HETEROCLITUS, CARDIAC-MUSCLE, RAINBOW-TROUT, COHO SALMON, GROWTH, FISH, LIGHT, SMOLTIFICATION
  • Atatürk Üniversitesi Adresli: Evet

Özet

The objective of this study was to examine the effects of various lighting regimes on the plasma thyroxin hormone (T(4)) level of mirror carp (Cyprinus carpio). The carp were kept at the low temperature of 9 degrees C to eliminate any influence of water temperature on feed intake, growth, and the hormone level. Treatments were 8 h light:1 6 h dark, 12 h light:1 2 h dark, and 16 h light:8 h dark. Plasma thyroxin levels were measured every four weeks for 12 weeks. The levels were significantly 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.