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Aquaculture Environment Interactions

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AEI 10:487-499 (2018)  -  DOI:

Exploitation of reproductive barriers between Macrobrachium species for responsible aquaculture and biocontrol of schistosomiasis in West Africa

Amit Savaya-Alkalay1, Papa Demba Ndao2,3, Nicolas Jouanard3, Ndeye Diane2,3, Eliahu D. Aflalo1, Assaf Barki4, Amir Sagi1,*

1Department of Life Sciences and the National Institute for Biotechnology in the Negev, Ben-Gurion University, PO Box 653, Beer Sheva 84105, Israel
2Université Gaston Berger - BP 234 Saint-Louis, Senegal
3Biomedical Research Center Espoir Pour La Santé, 263 route de la Corniche, Sor, Saint-Louis, Senegal
4Department of Poultry and Aquaculture, Institute of Animal Science, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
*Corresponding author:

ABSTRACT: Macrobrachium prawns are voracious predators of the freshwater snails that host the flatworms responsible for bilharzia (schistosomiasis), a health burden in many African countries. A novel strategy to decrease the disease in Africa involves the use of prawns as biocontrol agents of the snails. Although the endemic African river prawn Macrobrachium vollenhovenii is a natural candidate for aquaculture and biocontrol, efforts to domesticate it have been unsuccessful to date, and it is not available in the large quantities required for aquaculture and biocontrol. The Asian giant prawn Macrobrachium rosenbergii has been cultured worldwide for decades. Recently, novel biotechnologies were developed to create monosex (all-male) non-breeding populations for aquaculture that we suggest are also ideal for biocontrol in Africa. Since the above 2 prawn species are of the same genus, exhibit similar sizes and require a female pre-mating molt prior to egg fertilization, the potential for cross-breeding between the 2 species must be tested. To assure that all-male populations of M. rosenbergii will not pose such an ecological threat, we carried out cross-breeding experiments with M. vollenhovenii. Both interspecies encounters and attempts at artificial insemination revealed that fertilization does not occur between the 2 species. Our results demonstrate both behavioral and physiological pre-zygotic reproductive barriers between these species. We suggest that all-male M. rosenbergii can be used as an aquaculture species and as a biocontrol agent in areas where M. vollenhovenii occurs without concern for hybridization.

KEY WORDS: All-male populations · Artificial insemination · Bilharzia (schistosomiasis) · Biocontrol · Cross-breeding · Macrobrachium · Reproductive barrier · Aquaculture

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Cite this article as: Savaya-Alkalay A, Ndao PD, Jouanard N, Diane N, Aflalo ED, Barki A, Sagi A (2018) Exploitation of reproductive barriers between Macrobrachium species for responsible aquaculture and biocontrol of schistosomiasis in West Africa. Aquacult Environ Interact 10:487-499.

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