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H&E (hematoxylin and eosin) stained gill arches from a moribund black seabream (Acanthopagrus butcheri) collected at the Swan River fishkill on April 10, 2005. Note loss of intra-lamellar spacing and secondary lamellar fusion with extensive hyperplasia of gill epithelial tissue. This pathology is identical to that observed when pure KmTx 2 is exposed to fish the laboratory (Deeds et al., 2006).
