Resumen

SALAZAR, Greys et al. Hibridación entre los Camarones de río macrobrachium rosenbergii (de man) y m. Acanthurus (Wiegmann). ¿Es posible?. INCI [online]. 2005, vol.30, n.8, pp.501-505. ISSN 0378-1844.

Macrobrachium rosenbergii is an exotic freshwater shrimp species found in Venezuelan rivers, and there is concern about the possibility of hybridization with native species affecting the natural biodiversity of the region. In this study, the possibility of hybridization between M. rosenbergii and the native species M. acanthurus was evaluated using controlled mating and artificial insemination. We compared the efficiency of both types of reproduction using intraspecific crosses in both species. Both reproduction methods were equally efficient in both species according to most of the quantified variables. However, the success rate in the production of larvae was lower in the intraspecific crosses of M. rosenbergii using artificial insemination. Ten interspecific crosses were carried out using controlled mating between M. rosenbergii males and M. acanthurus females, as well as ten reciprocal crosses. Neither courtship nor mating attempts were observed, which suggests that ethological reproductive isolation exists between these two species. Nineteen attempts were carried out using artificial insemination between M. rosenbergii males and M. acanthurus females, as well as 21 reciprocal crosses. In every case, fertilized eggs were observed but they did not progress past the blastula stage. The ethological reproductive isolation and the lack of viability of the hybrid zygotes constitute pre- and postzygotic barriers that should preclude the natural hybridization of these species.

Palabras clave : Hibridación; Inseminación Artificial; Macrobrachium acanthurus; Macrobrachium rosenbergii.