Utilization of the light density to reduce the development of <i>Lyngbya</i> sp. and their growth on <i>Caulerpa lentillifera</i> J. Agardh in a recirculating aquature system

Florian Quemper; Tien Duc Dam; Linh Manh Nguyen; Anh Thi Mai Nguyen; Hoang Nguyen; Hung Manh Vu

doi:10.15625/1859-3097/20/3/14880

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Authors

Florian Quemper lnstitut National Sup4rieur des Sciences Agronomiques, de I'Alimentation et de l'Environrement (AgroSup Dijon). No. 26 Bd Dr Petitjean - BP 87999 21079 Dijon Cedex, France
Tien Duc Dam Institute of Marine Environment and Resources, VAST, Vietnam
Linh Manh Nguyen Institute of Marine Environment and Resources, VAST, Vietnam Graduate University of Science and Technology, VAST, Vietnam
Anh Thi Mai Nguyen Institute of Marine Environment and Resources, VAST, Vietnam
Hoang Nguyen Vietnam Centre of Science and Technology for Sea Culture, Hanoi, Vietnam
Hung Manh Vu Institute of Marine Environment and Resources, VAST, Vietnam https://orcid.org/0000-0003-2927-9677

DOI:

https://doi.org/10.15625/1859-3097/20/3/14880

Keywords:

Caulerpa lentillifera, Lyngbya sp., light density, recirculating aquaculture system, seaweed culture.

Abstract

The release of pollutants is endangering ecosystems, biodiversity and seafood. Therefore, it is of the requirement to create innovative methods in seafood production. Caulerpa lentillifera J. Agardh is a well-known seaweed for its properties and edible. We cultured C. lentillifera in a recirculating aquaculture system under laboratory conditions. However, after 7 days the culture was invaded by epiphyte algae Lyngbya sp. This experiment was designed to remove those algae by using light density as a treatment. Two irradiances were tested including 20 μmol photons m^-2.s^-1 (low light density) and 40 μmol photons m^-2.s^-1(initial light density). Every week we measured the stolon length, thallus weight, and calculated the specific growth rate. Results showed that after 30 days C. lentillifera under low light density regained their healthy green color and Lyngbya sp. was no longer present. Meanwhile, in the initial light density (40 μmol photons m^-2.s^-1) Lyngbya sp. covered almost all thalli of C. lentillifera, and half of them were dead. The measured results of specific growth rate (%d^-1) and weight (g) of C. lentillifera in low light density conditions were better than those of C. lentillifera in the initial condition. The light density, therefore, might be used as a treatment to remove Lyngbya sp. from Caulerpa lentillifera in aquaculture.

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