Gonadal steroid fluctuations and reproduction results of European grayling (Thymallus thymallus L.) from broodstock farmed in a recirculation aquaculture system

Szmyt, Mariusz; Piech, Przemysław; Panasiewicz, Grzegorz; Niewiadomski, Piotr; Pietrzak-Fiećko, Renata

doi:10.1016/j.anireprosci.2020.106648

Cited by 11 publications

(1 citation statement)

References 60 publications

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“…However, T tended to decrease later than E2 in all groups. The trend was also observed in Atlantic salmon (Dickhoff et al 1989;Taranger et al 1998) and European grayling Thymallus thymallus (Szmyt et al 2021). Similar results were observed in wild brown trout, in which the highest concentration of plasma E2 occurred 30 days prior to ovulation, while, in cultured brown trout, the peak level was 14 days before ovulation (Norberg et al 1989).…”

Section: Discussionsupporting

confidence: 79%

Efficacy of poly (lactic-co-glycolic acid) microparticles as a gonadotropin-releasing hormone analogue delivery system to stimulate ovulation of peled Coregonus peled

Knowles¹,

Vysloužil²,

Muselík³

et al. 2021

CZECH J ANIM SCI

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The aim of the study was to determine the efficacy of poly (lactic-co-glycolic acid) microparticles as a carrier of gonadotropin-releasing hormone analogues (GnRHa) for induction of ovulation in peled Coregonus peled. Female peled were injected intraperitoneally with 1) saline solution only (control), 2) mammalian GnRHa at 25 µg/kg body weight, 3) GnRHa in 753-type microparticles at 50 µg/kg, or 4) GnRHa in 653-type microparticles at 50 µg/kg. Blood plasma samples were taken on days 0, 4, 8, and 12 post-injection. All hormone treatments induced synchronous ovulation and higher cumulative ovulation compared to controls. Hormone treatments did not affect relative fecundity or the percentage of eyed eggs. Testosterone level decreased toward the onset of ovulation. On day eight of the trial, the testosterone level was significantly lower in hormone-treated groups compared to the control group. The level of 17β-oestradiol showed a decreasing trend post-injection, with the lowest observed level on day eight. Our results demonstrate that ovulation can be induced in the peled by the sustained – release of GnRHa in poly (lactic-co-glycolic acid) microparticles, but the treatment does not improve reproductive performance.

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