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Master Thesis

Study of an economical shrimp farming protocol aiming at improving control over water quality

Abstract : For a first cycle at Skretting Vietnam new validation farm with Penaeus vannamei, several bioremediation techniques were assessed to improve control over water quality. For the nursery phase, a protocol meant to enhance nitrogen assimilation from heterotrophic bacteria was tried. A biofloc system was set up with a carbon/nitrogen ratio of 12:1. The resulting heterotrophic system appeared to be efficient in controlling ammonia levels, and featured very stable pH and oxygen values. However, low oxygen issues quickly appeared inside the pond as the bacterial biomass was not removed. Nevertheless, this trial gave good results in terms of survival and feed conversion ratio. The second part of this study is focused on the grow-out phase and investigates the potential of fermented rice bran to balance heterotrophic and photosynthetic activities. A large scale trial in shrimp ponds was performed, where two protocols either based on the regular addition of sugar cane molasses or fermented rice bran were compared. The application of fermented rice bran appeared to have significantly reduced oxygen and pH variations. Furthermore, rice bran also appeared to have a beneficial impact over the mineralization of organic matter, and shrimps in ponds fertilized with fermented rice bran showed better performance results. However due to a disease outbreak, the experiment had to be terminated early and was therefore incomplete.
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Master Thesis
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Jean-Benoît Darodes de Tailly. Study of an economical shrimp farming protocol aiming at improving control over water quality. Life Sciences [q-bio]. 2019. ⟨dumas-02364683⟩

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