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All recaptured wels catfish sampled by the authors were euthanized with an overdose of clove oil (1\u2009mL L\n                      \u22121\n                      ) and a gill cut and according to the ordinance on slaughter and killing of animals (Tierschutzschlachtverordnung \u00a7 13).","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval"}},{"value":"The authors declare no competing interests.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"24"}}