IBBEA   24401
INSTITUTO DE BIODIVERSIDAD Y BIOLOGIA EXPERIMENTAL Y APLICADA
Unidad Ejecutora - UE
artículos
Título:
Reproductive aspects of Notothenia rossii and Notothenia coriiceps (Perciformes, Nototheniidae) at Potter Cove, 25 de Mayo (King George) Island during austral summer
Autor/es:
VARELA, M.L.; GENOVESE, G.; FERREIRA, M.F.; ANSALDO, M.; LO NOSTRO, F. L.
Revista:
POLAR BIOLOGY
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2016 vol. 1 p. 1 - 25
ISSN:
0722-4060
Resumen:
Trabajo enviado el 26/6/15 a Polar Biology.Several fish species of the suborder Notothenioidei (Perciformes) predominate in the Antarctic Convergence Zone nevertheless, reproductive studies are scarce due to difficulties on regular sampling. Hence, the aim of this study was to attain a deeper knowledge of the reproductive biology of females of Notothenia rossii and N. coriiceps captured during the Antarctic summer at Potter Cove, Isla 25 de Mayo, through gonadal histology, gonadosomatic index, plasma steroid levels, and detection of vitellogenin, the main nutritional reserve for the developing embryo. Histological analysis revealed that females of both fish possess group synchronous ovarian development with two distinct clutches of oocytes: a more advanced batch of vitellogenic oocytes ready for spawning, and a second batch of previtellogenic oocytes for the next spawning event. Since liver vitellogenin synthesis is stimulated by estradiol produced by the ovaries, gonadal development, estradiol levels, and vitellogenin showed that both species were at a more advance stage of maturation in March than in January. On the other hand and irrespectively of the month, gonadosomatic index and plasma estradiol levels of N. coriiceps were higher than those of N. rossii. Furthermore, females of N. coriiceps showed an advanced stage of vitellogenesis or were ready for spawn, contrary to what was stated in previous studies. These results indicate a successful use of gonadal morphology, estradiol and vitellogenin detection for the estimation of sexual maturity stage of female adults, being this the first report of the presence of vitellogenin in plasma samples of Antarctic fish.