The effects of photothermal manipulation on reproductive development in female haddock Melanogrammus aeglefinus L.

Haddock (Melanogrammus aeglefinus L.) were maintained on either simulated natural (SNP) or advanced, phase-shifted photoperiods (ADV) and reproductive characteristics of female fish were measured throughout two reproductive cycles. By advancing the seasonal photoperiod 8 weeks, relative to ambient conditions, follicle development, peak levels of estradiol and initiation of spawning were all accelerated compared with fish maintained on an SNP. Profiles of steroid synthesis and follicular development were similar between the two groups but the spawning period was protracted by 40 days in the fish maintained on ADV. Ultrasound imaging proved to be an effective and non-invasive tool for accurately assessing ovarian development throughout the reproductive cycle. These results suggest that photoperiod manipulation has significant potential for extending the availability of eggs and larvae for haddock aquaculture.

[1]  J. Specker,et al.  Changes in gonadal hormones during oocyte development in the striped bass,Morone saxatilis , 1991, Fish Physiology and Biochemistry.

[2]  B. Mourot,et al.  Reproductive performance of common dentex, Dentex dentex, broodstock held under different photoperiod and constant temperature conditions , 2001, Fish Physiology and Biochemistry.

[3]  Y. Nagahama,et al.  Diurnal rhythm of serum steroid hormone levels in the Japanese whiting, Sillago japonica, a daily-spawning teleost , 1990, Fish Physiology and Biochemistry.

[4]  N. W. Pankhurst,et al.  The relationship between plasma and ovarian levels of gonadal steroids in the repeat spawning marine fishesPagrus auratus (Sparidae) andChromis dispilus (Pomacentridae) , 2004, Fish Physiology and Biochemistry.

[5]  T. M. Bradley,et al.  The effects of photoperiod manipulation on the reproduction of black sea bass, Centropristis striata , 2003 .

[6]  Y. Zohar,et al.  Effects of Phase-Shifted Photoperiod Regimes on Oocyte Growth and Hormonal Profiles in Female Striped Bass Morone saxatilis , 2002 .

[7]  N. Bromage,et al.  The environmental regulation of maturation in farmed finfish with special reference to the role of photoperiod and melatonin , 2001 .

[8]  D. Martin-Robichaud,et al.  Assessment of sex and evaluation of ovarian maturation of fish using ultrasonography , 2001 .

[9]  N. W. Pankhurst,et al.  Effect of consecutive 9- or 12-month photothermal cycles and handling on sex steroid levels, oocyte development, and reproductive performance in female striped trumpeter Latris lineata (Latrididae) , 2000 .

[10]  T. M. Bradley,et al.  Production, Quality, and Low Temperature Incubation of Eggs of Atlantic Cod Gadus morhua and Haddock Melanogrammus aeglefinus in Captivity , 2000 .

[11]  G. Ankley,et al.  Effects of Photoperiod Manipulation on Brook Trout Reproductive Development, Fecundity, and Circulating Sex Steroid Concentrations , 2000 .

[12]  H. Johnsen,et al.  Temperature experienced during vitellogenesis influences ovarian maturation and the timing of ovulation in common wolffish , 1999 .

[13]  Christopher L. Brown,et al.  Photoperiod control of sexual maturation of the Atlantic halibut (Hippoglossus hippoglossus): plasma thyroid hormone and calcium levels , 1998 .

[14]  A. Canario,et al.  Plasma concentrations of ovarian steroids in relation to oocyte final maturation and ovulation in female plaice sampled at sea , 1998 .

[15]  O. S. Kjesbu,et al.  Oocyte size and structure in relation to blood plasma steroid hormones in individually monitored, spawning Atlantic cod , 1996 .

[16]  L. A. Helfrich,et al.  Sex steroid hormone and vitellogenin levels in striped bass (Morone saxatilis) maturing under 6-, 9-, and 12-month photothermal cycles. , 1994, General and comparative endocrinology.

[17]  Joseph A. Brown,et al.  Seasonal Reproduction and Plasma Levels of Sex Steroids and Vitellogenin in Atlantic Halibut (Hippoglossus hippoglossus) , 1992 .

[18]  K. G. Waiwood,et al.  Reproductive Biology of Southwest Scotian Shelf Haddock (Melanogrammus aeglefinus) , 1989 .

[19]  N. Bromage,et al.  The effect of modifications in photoperiod on spawning time, ovarian development and egg quality in the sea bass (Dicentrarchus labrax L.) , 1989 .

[20]  D. Clay.  Oogenesis and fecundity of haddock ( Melanogrammus aeglefinus L.) from the Nova Scotia shelf , 1989 .

[21]  H. Gordin,et al.  Sequence of gonadal events and oestradiol levels in Sparus aurata (L.) under two photoperiod regimes , 1985 .

[22]  C. Schreck,et al.  Steroid and thyroid hormones during sexual maturation of coho salmon (Oncorhynchus kisutch) in seawater of fresh water. , 1982, General and comparative endocrinology.

[23]  A. P. Robb.  Histological observations on the reproductive biology of the haddock, Melanogrammus aeglefinus (L.) , 1982 .

[24]  L. Crim.  Environmental Modulation of Annual and Daily Rhythms Associated with Reproduction in Teleost Fishes , 1982 .

[25]  Kelly Selman,et al.  Cellular and dynamic aspects of oocyte growth in teleosts , 1981 .

[26]  J. Wingfield,et al.  Seasonal changes in plasma cortisol, testosterone and oestradiol-17beta-in the plaice, Pleuronectes platessa L. , 1977, General and comparative endocrinology.