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Varroa mites are external honeybee parasites that attack both the adults and the brood, with a distinct preference for drone brood. It was first found in South Africa in August 1997, the first report of this mite in sub-Saharan Africa. An immediate survey revealed that the mite was common and widespread in both commercial and wild honeybee populations in the Western Cape, but absent from the rest of the country.
Vermiculated sailfin catfish
The vermiculated sailfin catfish has rows of armour plating covering its body; the abdomen is almost completely covered in small plates. Colour pattern is generally dark brown with either darker spots or lighter spots (or vermiculations). The adult size can range from about 50–70cm. Environmental impacts of vermiculated sailfin catfish are not fully understood, but in locations where they are introduced and abundant, their feeding behaviours and burrowing activities can cause considerable disturbance.
White garden snail
A relatively small snail with a shell diameter of 20mm. It is similar looking in shape to the common garden snail (also an invasive species from Europe), but much paler in colour with some specimens being chalky white. They often have broken brown lines along the spirals. Agricultural and garden pest – it is known to damage numerous plants as well as economically important crops.
This crayfish can grow 10-20cm but some individuals attain a length of 30cm. Colour is variable and depends on water quality, but most take on a greyish-blue to vivid metallic blue colour. This is not an indigenous species and may have negative impacts on our wetland systems by competing against indigenous species. The burrowing activity may cause damage to dams and riverbanks.