|Appears in Collections:||Aquaculture Journal Articles|
|Peer Review Status:||Refereed|
|Title:||Influence of tidal cycles on the endocrine control of reproductive activity in common snook (Centropomus undecimalis)|
Main, Kevan L
|Citation:||Rhody N, Davie A, Zmora N, Zohar Y, Main KL & Migaud H (2015) Influence of tidal cycles on the endocrine control of reproductive activity in common snook (Centropomus undecimalis), General and Comparative Endocrinology, 224, pp. 247-259.|
|Abstract:||The aim of our study was to confirm the role of tidal pattern on the coordination of oocyte maturation and spawning in common snookCentropomus undecimalis. To do so, we studied oocyte maturation during the spawning season in relation to the tidal pattern in both males and females by means ofhistologyand hormonal profiling along thepituitary–gonadal axis. PlasmaLHlevels, as well as transcript levels ofgonadotropingenes (fshβandlhβ) from thepituitariesof sexually mature male and female common snook were analyzed using a heterologousELISAandquantitative RT-PCR, respectively. ThefshβandlhβcDNAs were isolated andphylogenetic analysisof the deduced amino acid sequences revealed strong identity with other teleosts (75–90%). A strong link was found between tide and follicular development irrespective of the time of the day: female snook sampled on the rising tide were all found to have oocytes in the Secondary Growth Stage whereas females sampled at high tide or on the falling tide had oocytes in the later stages of maturation and ovulation. In addition, LH plasma and mRNA levels offshβandlhβincreased during the later stages of vitellogenesis peaking at ovulation in females. Plasmaestradiolandtestosteronesignificantly increased in late vitellogenesis (Secondary Growth Stage) and oocyte maturation (Eccentric GerminalVesicleStep) respectively. Among male common snook sampled, no correlation was identified between tide and gonadal development. In addition,lhβmRNA expression in males peaked at the mid germinalepitheliumstage as for testosterone and11-KTin the blood whilefshβexpression and plasma LH levels peaked at late germinal epithelium stage. This study confirms the role played by tidal cycle on the entrainment of the later stages of oogenesis of common snook and provides a better understanding of the link between environmental andendocrinecontrol of reproduction in this species.|
|Rights:||The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.|
|Affiliation:||Mote Marine Laboratory|
University of Maryland
University of Maryland
Mote Marine Laboratory
|Rhody et al_GCE_2015.pdf||1.94 MB||Adobe PDF||Under Embargo until 31/12/2999 Request a copy|
Note: If any of the files in this item are currently embargoed, you can request a copy directly from the author by clicking the padlock icon above. However, this facility is dependant on the depositor still being contactable at their original email address.
This item is protected by original copyright
Items in the Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
If you believe that any material held in STORRE infringes copyright, please contact firstname.lastname@example.org providing details and we will remove the Work from public display in STORRE and investigate your claim.