Fræðaþing landbúnaðarins - 08.02.2008, Blaðsíða 530

528 | FRÆÐAÞING LANDBÚNAÐARINS 5, 2008
Þessar niðurstöður eru í samræmi við niðurstöður úr öðrum tilraunum þar sem reynt
hefur verið að breyta hrygningartíma bleikju með ljóslotu (Gillet 1994; Duston,
Astatkie et al. 2003; Frantzen, Amesen et al. 2004).
Stöðugt ljós til lengri tíma virðist ekki koma í veg fyrir kynþroskaeinkenni þó svo að
fiskur sleppi ekki hrognum og sviljum, sem er í samræmi við tilgátur um að fiskar
verði kynþroska án utanaðkomandi áhrifa (Duston and Bromage 1991).
Heimildaskrá
Bromage, N., M. Porter, et al. (2001). "The environmental regulation of maturation in farmed finfish
with special reference to the role of photoperiod and melatonin." Aquaculture 197(1-4): 63-98.
Bromage, N. R., J. Duston, et al. (1990). "Photoperiodic control of teleost reproduction." Progress in
clinical and biological research 342620(6).
Bromage, N. R., J. A. K. Elliot, et al. (1984). "The effects of constant photoperiod on the timing of
spawning in the rainbow trout." Aquaculture 43(1-3): 213-223.
Duston, J., T. Astatkie, et al. (2003). "Long-to-short photoperiod in winter halves the incidence of
sexual maturity among Arctic charr." Aquaculture 221(1-4): 567-580.
Duston, J. and N. Bromage (1991). "Circannual Rhythms of Gonadal Maturation in Female Rainbow-
Trout (Oncorhynchus-Mykiss)." Joumal of Biological Rhvthms 6(1): 49-53.
Eyþórsdóttir, E., Pétursdóttir, et al. (1995). "Comparison of strains of Arctic charr (salvelinus alpinus)
in Iceland, for bodyweight and sexual maturity." Proceedings of the 5th congress of the aenetic
application of livestock production 19(387-390).
Frantzen, M., A. M. Amesen, et al. (2004). "Effects of photoperiod on sex steroids and gonad
maturation in Arctic charr." Aquaculture 240(1-4): 561-574.
Gillet, C. (1994). "Egg-Production in Arctic Charr (Salvelinus-Alpinus L) Broodstock - Effects of
Photoperiod on the Timing of Ovulation and Egg Quality." Canadian Joumal of Zoology-Revue
Canadienne De Zoologie 72(2): 334-338.
Jobling, M., H. Tveiten, et al. (1998). "Cultivation of Arctic charr: An update." Aquaculture
Intemational 6(3): 181-196.
LFH. (2007). "Hagtölur - Eldið." Retrieved 22.01.08, 2008, from http://www.lfh.is/hagtolur-
eldid.htm.
Mortensen, A., O. Ugedal, et al. (2007). "Seasonal variation in the temperature preference of Arctic
charr (Salvelinus alpinus)." Joumal of Thermal Biology 32(6): 314-320.
Sokal, R. and F. J. Rolf (1981). Biometrv. New York, W.H. Freedman and Company.
Takashima, F. and Y. Yamada (1984). "Control of Maturation in Masu Salmon by Manipulation of
Photoperiod." Aquaculture 43(1-3): 243-257.
Tveiten, H., I. Mayer, et al. (1998). "Sex steroids, growth and condition of Arctic charr broodstock
during an annual cycle." Joumal of Fish Biology 53(4): 714-727.