PGF2α and gonadal steroid plasma levels of successful and unsuccessful spawning Piaractus mesopotamicus (Teleostei, Characiformes) females
- 183 Downloads
Gonadal steroid and prostaglandin F2α (PGF2α) plasma levels were evaluated in successfully (SP) and unsuccessfully ovulated (UN) female Piaractus mesopotamicus. Forty-one females were injected with crude carp pituitary extract (0.6 and 5.4 mg kg−1 with a 24-h interval between the doses) and sampled to determine the plasma concentration of 17β-estradiol (E2), 17α-hydroxyprogesterone (17α-OHP), 17α,20β-dihydroxy-4-pregnen-3-one (DHP), PGF2α, and testosterone (T) after each injection (first—A1 and second—A2), and at the time of ovulation for SP and UN. Two clusters were obtained using multivariate analysis: 1—composed of all A1, all A2, and some UN; and 2—composed of all SP and some UN. Median values of E2 plasma levels were similar between clusters; however, plasma levels of T, 17α-OHP, DHP, and PGF2α of cluster 2 (predominantly formed by SP) were higher than those of cluster 1. Since cluster 2 contained all SP and females of this cluster presented higher levels of PGF2α, T, 17α-OHP, and DHP, here we evidently shown in an unprecedented manner that concomitant increased levels of these substances were associated with successful ovulation in this species, but such an increase was not determinant for successful ovulation due to the presence of some UN females in the same cluster 2. These findings highlight the unexplored potential of PGF2α to be used as an accessory tool for inducing successful ovulation for fish farming purposes.
KeywordsPacu Crude carp pituitary extract Successful spawning Gonadal steroid plasma levels Prostaglandin F2α Multivariate analysis
The authors are grateful to Dr. Elisabeth Criscuolo Urbinati (Departamento de Morfologia e Fisiologia Animal/Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal - FCAV) for helping with the initial hypothesis.
The main source of funding was the National Council for Scientific and Technological Development (CNPq, Portuguese: Conselho Nacional de Desenvolvimento Científico e Tecnológico) by Process 458274/2014-3 and 447169/2014-9 and “Programa de Apoio aos Biotérios da Unesp” – PROPE-UNESP-2014. Additionally, the cost of the fish and their maintenance was covered by the Centro de Aquicultura da UNESP – CAUNESP. R.Y.K. was supported by Coordination for the Improvement of Higher Education Personnel (CAPES, Portuguese: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) under the National Postdoctoral Program (PNPD-CAPES).
- Goetz FW (1983) Hormonal control of oocyte final maturation and ovulation in fishes. In: Hoar WS, Randall DJ, Donaldson ΕΜ (eds) Fish physiology. Academic, New YorkGoogle Scholar
- Jalabert B, Fostier A (1984) The modulatory effectin vitro of oestradiol-17β, testosterone or cortisol on the output of 17α-hydroxy-20β dihydroprogesterone by rainbow trout (Salmo gairdneri) ovarian follicles stimulated by the maturational gonadotropin s-GtH. Reprod Nutr Dev 24:127–136CrossRefGoogle Scholar
- Mikolajczyk T, Sokosmallerska-Mikolajczyk M, Chyb J, Szczerbik P, Socha M, Foks M, Duc M, Epler P (2007) LH secretion and 17β-oestradiol concentration in the blood plasma and hypothalamus of goldfish (Carassius auratus gibelio B.) and common carp (Cyprinus carpio L.) treated with fadrozole (aromatase inhibitor) and GnRH analogues. Czech J Anim Sci 52:354–362CrossRefGoogle Scholar
- Moro GV, Rezende FP, Alves AL, Hashimoto DT, Varela ES, Torati LS (2013) Espécies de peixe para piscicultura. In: Rodrigues APO, Lima AF, Alves AL, Rosa DK, Torati LS, Santos VVR (eds) Piscicultura de água doce: Multiplicando conhecimentos, 1st edn. Embrapa, BrasíliaGoogle Scholar
- Yaron Z, Bogomolnaya A, Drori S, Biton I, Aizen J, Kulikovsky Z, Levavi-Sivan B (2009) Spawning induction in the carp. Past experience and future prospects—a review. Isr J Aquacult 61:5–26Google Scholar