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Oxytetracycline accumulation in the macroalgae Ulva: Potential risks for IMTA systems
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Advisor(s)
Abstract(s)
Oxytetracycline (OTC) is one of the most used antibiotics in aquaculture. With the development of Integrated Multitrophic Aquaculture (IMTA) systems in order to mitigate some aquacultures' adverse effects, attention needs to be shifted to other co-cultured species that can also accumulate such
pharmaceuticals and pose a risk to human consumption. Therefore, the present work evaluated the
exposure of the seaweed Ulva to OTC at two realistic concentrations (0.040 and 0.120 mg L1
). Oxytetracycline degradation rates in seawater were dependent on the initial concentration but were not
influenced by the presence of Ulva. The macroalgae presented good assimilation rates of OTC, with internal concentrations reaching 40.9934 ng g1 WW for the lowest concentration tested and
108.6787 ng g1 WW for the highest, with a steep decrease after 48 and 24 h, respectively. Nonetheless,
concentrations were still half of the Maximum Residue Limit set for fish (100 mg kg1) 48 h after C2
treatment. The highest dosage tested stimulated growth 96 h after the beginning of the trial, although
some signs of decay could also be found in Ulva's fronds.
Description
Financial support was given by FEDER through the project
ReNATURE - Valorization of the Natural Endogenous Resources of
the Centro Region (Centro 2020, Centro-01-0145-FEDER-000007)
and SmarBioR - Smart Valorization of Endogenous Marine Biological Resources Under a Changing Climate (Centro 2020, Centro-01-
0145-FEDER-000018), co-funded by Centro (2020) Program,
Portugal 2020, European Union, through the European Regional
Development Fund. Authors also acknowledge FCT for the grant
attributed to Joao Rosa (grant SFRH/BD/102008/2014) and to Sara ~
Leston (grant SFRH/BPD/91828/2012). The funding source did not
interfere with the study design, or in the collection, analysis or
interpretation of the data. It also had no involvement in the writing
of the report and in the decision to submit the present manuscript
for publication.
Keywords
Oxytetracycline Aquaculture IMTA Macroalgae Accumulation Legislation
Citation
Rosa, J., Leston, S., Pardal, M. A., Freitas, A., Barbosa, J., Ramos, F., … Lemos, M. F. L.. (2019). Oxytetracycline accumulation in the macroalgae Ulva: Potential risks for IMTA systems. Chemosphere, 226, 60–66. https://doi.org/10.1016/j.chemosphere.2019.03.112