Selection for disease resistance in Indian white shrimp
The Indian white shrimp (Fenneropenaeus indicus) is an important species in the aquaculture industry of Egypt, and it has been negatively affected by various major diseases. Several selective breeding programs for farmed shrimp have succeeded elsewhere in improving disease resistance against specific pathogens, indicating that genetic improvement in resistance to several diseases is feasible.
However, for optimal implementation of selection for improved disease resistance in a breeding program, it is critical to investigate if significant genetic correlations exist between disease resistance and other traits of importance included in the breeding objective.
The selection for disease resistance is a sustainable method for developing aquaculture production by offering ways to develop more disease resistant stocks. It is well documented that there is large additive genetic variance in resistance to common diseases in aquaculture, and this may facilitate high response to selection. Efficient breeding programs for shrimp should include improved disease resistance through selection.
Our research work implemented selection for increased disease resistance as a part of the selection program for Indian white shrimp at a private shrimp farm in the AL Dibah Triangle Zone (DTZ) in Egypt. Our research is based on controlled challenge test experiments in which shrimp from each of the individual families produced in the breeding nucleus are exposed to WSSV, IHHNV and Vibrio (EMS) using infected cohabitants (disease carriers).
The overall objectives of our project – supported by Science & Technology Development Fund (STDF), Egypt under grant No. 5661 – were to develop a selection program for increased resistance to major shrimp pathogens in Indian white shrimp, to investigate the level of additive genetic variation for resistance to a combined infection of WSSV, IHHNV and Vibrio (EMS) in challenge tests under commercial rearing conditions, and to develop a single, all-purpose, strain or breed rather than several breeds specialized for particular environments (e.g. particular diseases).
We hope our work has direct economic benefits for shrimp farmers, by reducing shrimp losses due to diseases outbreaks. Here we review some of the project’s main activities since late 2013.
– See more at: http://advocate.gaalliance.org/selection-for-disease-resistance-in-indian-white-shrimp/#sthash.B38FAf29.dpuf