by
Fabián Jijón, Global Species Manager Aquaculture and International Sales
Manager in LATAM, Dostofarm GmbH and Francisca Veinat G, Product Manager,
Dostofarm GmbH
Gregarines are common gut parasites that affects shrimp populations around the
world. This parasite can affect shrimp in any of its life cycle stage. Some of
the negative effects of the gregarine presence in shrimp aquaculture are low
daily weight gain and high feed intake, leading to a high FCR, and secondary
bacterial infections (Vibrio spp.).
Earth ponds, which are the most widespread
building practice for commercial shrimp operations, living vectors (ie clams),
low pond soil bottom management, high feeding rates or low feed quality are
some of the factors that increase the risk of having Gregarines present in
shrimp aquaculture systems.
Feed additives have been used for years to support performance and animal
health. The positive effects of essential oils are well-known from human
medicine and can also contribute to increase performance and health in
livestock and aquaculture. Essential oregano oil is characterised by its
antimicrobial and antiparasitic properties. The effectiveness depends on the
chemical composition of the oregano oil. This is influenced by the origin,
plant species, growth stage and processing method. Important here is a
consistent quality of the essential oil in order to achieve a constant effect
at the recommended dosage.
Origin of oregano oil
In a commercial shrimp operation in Ecuador with a recurring gregarine problem
was tested the potential of DOSTO® Concentrate 500 to control the infection.
DOSTO® Concentrate 500, contains 50 percent oregano oil from a specific
subspecies of Origanum vulgare var. hirtum. After harvesting, the essential
oregano oil is extracted from the plant by gentle steam distillation.
The content of phytochemicals in the essential oil is determined after each
production in order to ensure a consistent standardised composition. Oregano
oil can be used in all livestock and aquaculture species both conventional and
organic production systems.
Read more, HERE.
The Aquaculturists
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