Dataset Information

Limited hybridization between introduced and Critically Endangered indigenous tilapia fishes in northern Tanzania.

ABSTRACT: Hybridization between introduced and indigenous species can lead to loss of unique genetic resources and precipitate extinction. In Tanzania, the Nile tilapia (Oreochromis niloticus) and blue-spotted tilapia (Oreochromis leucostictus) have been widely introduced to non-native habitats for aquaculture and development of capture fisheries. Here, we aimed to quantify interspecific hybridization between these introduced species and the indigenous species Oreochromis esculentus, Oreochromis jipe and Oreochromis korogwe. In the Pangani basin, several hybrids were observed (O. niloticus × O. jipe, O. leucostictus × O. jipe, O. niloticus × O. korogwe), although hybrids were relatively uncommon within samples relative to purebreds. Hybrids between the native O. jipe × O. korogwe were also observed. In the Lake Victoria basin, no evidence of hybrids was found. Analysis of body shape using geometric morphometrics suggested that although purebreds could be discriminated from one another, hybrids could not be readily identified on body and head shape alone. These results provide the first evidence of hybridization between the introduced species and the Critically Endangered O. jipe in Tanzania. Given uncertainty regarding benefits of introduced species over large-bodied indigenous species in aquaculture and capture fisheries, we suggest that future introductions of hybridization-prone species should be carefully evaluated.

SUBMITTER: Bradbeer SJ

PROVIDER: S-EPMC6394572 | biostudies-other | 2019

REPOSITORIES: biostudies-other

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Limited hybridization between introduced and Critically Endangered indigenous tilapia fishes in northern Tanzania.

Bradbeer Stephanie J SJ Harrington Jack J Watson Henry H Warraich Abrahim A Shechonge Asilatu A Smith Alan A Tamatamah Rashid R Ngatunga Benjamin P BP Turner George F GF Genner Martin J MJ

Hydrobiologia 20180418 1

Hybridization between introduced and indigenous species can lead to loss of unique genetic resources and precipitate extinction. In Tanzania, the Nile tilapia (Oreochromis niloticus) and blue-spotted tilapia (Oreochromis leucostictus) have been widely introduced to non-native habitats for aquaculture and development of capture fisheries. Here, we aimed to quantify interspecific hybridization between these introduced species and the indigenous species Oreochromis esculentus, ...[more]

PMID: 30880834

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Dataset Information

Limited hybridization between introduced and Critically Endangered indigenous tilapia fishes in northern Tanzania.

Publications

Limited hybridization between introduced and Critically Endangered indigenous tilapia fishes in northern Tanzania.

Similar Datasets

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