Hormone Induced Spawning of Summer Flounder Paralichthys dentatus

Hormone Induced Spawning of Summer Flounder Paralichthys dentatus During their first year in captivity, summer flounder Paralicthys denratus were induced to spawn with gonadotropin releasing hormone analogue (GnRHa) implants, injected carp pituitary extract (CPE) or human chorionic gonadotropin (hCG) injections. The percentage of fertile eggs was greatest (69%) in CPE‐treated females. CPE, but not GnRHa or hCG, was capable of stimulating oocyte growth (increased follicle diameter during vitellogenesis) followed by ovulation. Fish with maximum ovarian follicle diameters between 180 and 435 μm at the initiation of CPE injections produced the greatest percentage of fertile eggs. For most females, fertilization rate was greatest for the first batch of eggs ovulated. The mean fertilization rate for the first spawn of CPE‐treated fish was 42% compared with 14% for the second spawn from the same fish. Fish with maximum initial follicle diameters of 585 40 μm that were implanted with GnRHa ovulated the greatest number of eggs, but fertility was low and variable. Approximately 35% of females injected with hCG ovulated a limited number of eggs, but only one hCG‐treated female produced fertile eggs. Only a limited number of spermiating males were available for spawning trials. Hormone treatments used on females were ineffective for inducing or maintaining spermiation in male summer flounder. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the World Aquaculture Society Wiley

Hormone Induced Spawning of Summer Flounder Paralichthys dentatus

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Publisher
Wiley
Copyright
Copyright © 1997 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0893-8849
eISSN
1749-7345
D.O.I.
10.1111/j.1749-7345.1997.tb00964.x
Publisher site
See Article on Publisher Site

Abstract

During their first year in captivity, summer flounder Paralicthys denratus were induced to spawn with gonadotropin releasing hormone analogue (GnRHa) implants, injected carp pituitary extract (CPE) or human chorionic gonadotropin (hCG) injections. The percentage of fertile eggs was greatest (69%) in CPE‐treated females. CPE, but not GnRHa or hCG, was capable of stimulating oocyte growth (increased follicle diameter during vitellogenesis) followed by ovulation. Fish with maximum ovarian follicle diameters between 180 and 435 μm at the initiation of CPE injections produced the greatest percentage of fertile eggs. For most females, fertilization rate was greatest for the first batch of eggs ovulated. The mean fertilization rate for the first spawn of CPE‐treated fish was 42% compared with 14% for the second spawn from the same fish. Fish with maximum initial follicle diameters of 585 40 μm that were implanted with GnRHa ovulated the greatest number of eggs, but fertility was low and variable. Approximately 35% of females injected with hCG ovulated a limited number of eggs, but only one hCG‐treated female produced fertile eggs. Only a limited number of spermiating males were available for spawning trials. Hormone treatments used on females were ineffective for inducing or maintaining spermiation in male summer flounder.

Journal

Journal of the World Aquaculture SocietyWiley

Published: Mar 1, 1997

References

  • The interrelation of the size of the fish eggs, the date of spawning and the production cycle
    Bagenal, Bagenal
  • Egg quality determinates in finfish: the role of overripening with special reference to the timing of stripping in the Atlantic halibut Hippoglossus hippoglossus
    Bromage, Bromage; Bruce, Bruce; Basavaraja, Basavaraja; Rana, Rana; Shields, Shields; Young, Young; Dye, Dye; Smith, Smith; Gillespie, Gillespie; Gamble, Gamble
  • The spawning activity of cod, Gadus morhua L
    Kjesbu, Kjesbu
  • Effects of dietary vitamin C on maturation and egg quality of cod Gadus morhua L
    Mangor‐Jensen, Mangor‐Jensen; Holm, Holm; Rosenlund, Rosenlund; Lie, Lie; Sandnes, Sandnes
  • Reproduction of summer flounder, Paralichthys dentatus
    Morse, Morse

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