{"id":6358,"date":"2022-05-09T13:42:28","date_gmt":"2022-05-09T13:42:28","guid":{"rendered":"https:\/\/artemia.inveaquaculture.com\/?p=6358"},"modified":"2024-10-01T10:42:05","modified_gmt":"2024-10-01T10:42:05","slug":"patrick-sorgeloos-interview","status":"publish","type":"post","link":"https:\/\/artemia.inveaquaculture.com\/vi\/patrick-sorgeloos-interview\/","title":{"rendered":"Interview with AquaCulture Asia Pacific"},"content":{"rendered":"
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\u200bThe world of Artemia cysts as live feeds in marine shrimp hatcheries: insights on current trends in Artemia nauplii production, usage and technologies<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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In the January\/February<\/span><\/a> issue of AquaCulture Asia Pacific<\/span>,<\/a> Patrick Sorgeloos (Emeritus Professor at Ghent University), discusses Artemia cysts as live feeds in marine shrimp hatcheries and shared his knowledge of the history, importance, and potential of Artemia in supporting a sustainable aquaculture industry at a webinar organized by NACA<\/span><\/a> (Network of Aquaculture Centres in Asia-Pacific).\u00a0<\/p>

In his short introduction<\/a><\/span>, Patrick touched on several fundamental parameters to ensure optimal hatching and preparation of Artemia for use in fish\/crustacean hatcheries.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Understanding biology<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Artemia cysts are dry embryos, commonly referred to as eggs, they are approximately 0.2mm in diameter. Cysts have less than 10% water content but are very hygroscopic. They have zero metabolism but contain viable embryos: upon hydration embryonic development resumes.<\/p>

Patrick describes how the outer cuticular membrane acts as a molecular sieve. Molecules of oxygen, water and carbon dioxide can go in and out, however, any molecule bigger than carbon dioxide cannot get through this sieve.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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\u201cOnce fully hydrated, a light trigger resumes metabolism and initiates the carbohydrate metabolism. As a result, trehalose is converted to glycogen and glycerol which accumulate in the cysts. The more glycerol being produced, the more water absorbed, which ultimately results in a pressure build-up. This induces the breakdown of the chorion and the release of the embryo to the umbrella stage. Further incubation will allow the embryo to continue to develop into a free-swimming nauplius. This will subsequently molt into Instar I stage, and then into Instar II stage. All of this can happen within less than 24 hours.\u201d<\/em><\/p>

Patrick added that at the instar II stage, Artemia has an open mouth and a functional digestive system. This means from that moment onwards the animals can start to accumulate small particles through filtering, allowing them to be enriched with nutrients and bacteria.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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