“…(Becalski, Lau, Lewis, & Seaman, 2006;K Hoenicke, Gatermann, Hartig, Mandix, & Otte, 2004;Stadler et al, 2004). SEM is also believed occur naturally in some crustaceans such as prawns, crabs and shrimp (Katrin Hoenicke & Gatermann, 2006;Pereira, Donato, & De Nucci, 2004). As a result, the use of SEM as a definitive marker for the monitoring of nitrofurazone misuse is debatable.…”