Hooo-Hooo Volume 10, nr 4 - Page 22

WildLife Group of the SAVA Vet Diagnostix Blue Green Algal Poisoning in White Rhino Dr Rick Last – BVSc; M.Med.Vet (Pathology) Vetdiagnostix – Veterinary Pathology Services P.O. Box 13624 Cascades 3202 vetdiagnostix@futurenet.co.za Dr Peter Rogers Provet Wildlife Services P.O. Box 692 Hoedspruit 1380 provet@worldonline.co.za Dr Peter Rogers was called out to perform post mortems on four adult white rhino which had died acutely following access to a dam with an active blue green algal bloom (Figure 1). Prevailing winds had driven the algae onto the banks of the dam and the rhino had been observed drinking in these areas (Figures 2 and 3). Figure 1: Blue green algal bloom with greenish tinge to the dam water. Figure 3: Closer view of the heavy accumulation of blue green algal material on the waters edge. Figure 2: Dense accumulates of Microcystis aeruginosa on the waters edge with clear evidence of animals having frequented this area. 22 Gross post mortem findings were dominated by hepatic necrosis and widespread suggilation hemorrhages on serosal surfaces. The most outstanding histopathology was observed in the liver which demonstrated severe pan-necrosis with fragmentation of hepatocellular cords due to cell dissociation and only sinusoidal lining still intact (Figure 4). Extensive sinusoidal hemorrhages with