Oreochromis mossambicus (Peters, 1852)

Chan, Jeffery C. F., Tsang, Alphonse H. F., Yau, Sze-man, Hui, Tommy C. H., Lau, Anthony, Tan, Heok Hui, Low, Bi Wei, Dudgeon, David & Liew, Jia Huan, 2023, The non-native freshwater fishes of Hong Kong: diversity, distributions, and origins, Raffles Bulletin of Zoology 71, pp. 128-168 : 147

Oreochromis mossambicus × O. niloticus hybrid

Distribution. Tung Chung River, Pak Ngan Heung Stream, Shing Mun Reservoir, Lower Shing Mun Reservoir, Sha Kok Mei area, Tung Tsz Stream, Pui O Stream, Ting Kok area, Wang Tong River, Kai Tak River, Wong Lung Hang Stream, Shan Pui River, Tai O River, Po Toi Island, Lions Nature Education Centre, Big Wave Bay Stream, Tai Chung Hau area (H.T. Cheng, pers. comm., 2021); Sheung Yue River, Ho Chung River, Tai Shui Hang area (current survey).

Remarks. This hybrid is likely more widespread than currently reported, given that its morphological similarity to both parent species increases the likelihood of misidentification ( Van der Bank & Deacon, 2007). While genetic analyses are the most effective mode of verification, hybrids can also be recognised by breeding males that do not turn completely black (usually dark grey), and the caudal fins with black bars and red margins ( Tan et al., 2020).