Record of Blue tilapia Oreochromis aureus (Steindachner, 1864) in the Eerste River catchment, Western Cape province, South Africa

SM MarrSouth African Institute for Aquatic Biodiversity, Grahamstown, 6140, South Africa;DST/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South African Institute for Aquatic Biodiversity, Grahamstown6140, South Africa;Centre for Invasion Biology, South African Institute for Aquatic Biodiversity, Grahamstown, 6140, South AfricaCorrespondence[email protected]

http://orcid.org/0000-0001-8655-5522

G GouwsSouth African Institute for Aquatic Biodiversity, Grahamstown, 6140, South Africa

S AvlijasRedpath Museum, McGill University, 859 Sherbrooke Street West, Montreal, QC H3A 0C4, Canada

D KhosaSouth African Institute for Aquatic Biodiversity, Grahamstown, 6140, South Africa;Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown, 6140, South Africa

ND ImpsonScientific Services, CapeNature, Stellenbosch, 7599, South Africa

M van der WesthuizenConservation Services, CapeNature, Stellenbosch, 7599, South Africa

OLF WeylSouth African Institute for Aquatic Biodiversity, Grahamstown, 6140, South Africa;DST/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South African Institute for Aquatic Biodiversity, Grahamstown6140, South Africa;Centre for Invasion Biology, South African Institute for Aquatic Biodiversity, Grahamstown, 6140, South Africa

http://orcid.org/0000-0002-8935-3296

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Abstract

Oreochromis aureus was imported from Israel into South Africa in 1959 but data on its current status in South Africa are lacking. Genomic DNA was extracted and the COI gene amplified at the South African Institute for Aquatic Biodiversity. The identity of the sequences and specimens was determined using the Barcode of Life Data Systems and GenBank. Morphological and genetic assessment demonstrated that 11 specimens collected from two farm dams in the Eerste River System, Western Cape province, were Oreochromis aureus. A MaxEnt model compiled using global distribution, rainfall and temperature data predicted that large areas of southern Africa were climatically suitable for this species, indicating considerable invasion debt in southern Africa. As a result, surveys to assess for the extent of the invasion in South Africa and eradication of existing populations, if feasible, are recommended management actions.

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Record of Blue tilapia Oreochromis aureus (Steindachner, 1864) in the Eerste River catchment, Western Cape province, South Africa

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Record of Blue tilapia Oreochromis aureus (Steindachner, 1864) in the Eerste River catchment, Western Cape province, South Africa

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