Reproductive and brood cycles of Artemia persimilis Piccinelli & Prosdocimi from Colorada Chica Lake (Province of La Pampa, República Argentina), under laboratory conditions

X.I. Pastorino, E. Marschoff, R.G. Cohen-2002

Hydrobiologia, 486 (1): 279-288

Abstract:

The brood cycle in anostracans results from the overlapping of two successive reproductive cycles in the genital tract of females. While a clutch of oocytes begins to mature at the ovaries (ovarian period), the nauplii, cysts or unfertilised products of a previous clutch are developing in the ovisac or being released to the medium (oviduct-ovisac period). Models are proposed for the sequence of stages and their duration in a complete brood cycle under two treatments, i.e., females with males (1:1 ratio), and isolated virginal females of Artemia persimilis in laboratory conditions. The whole brood cycle in both treatments took 6 days, however, they differed in the duration of some stages. The differences are discussed and observations on amplexus are added.

(Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, C 1428 EHA Buenos Aires, Argentina, E-mail of R.G. Cohen: cohen@bg.fcen.uba.ar)

home