Gambusia affinis (Baird & Girard)

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 : 149

Gambusia affinis (Baird & Girard)

( Fig. 43 , [LU])

Distribution. Lamma Island area, Luk Tei Tong area, Luk Keng area, Pui O area, Sham Chung area, Sha Lo Tung area ( Dudgeon & Chan, 1996); Lok Ma Chau area (Environmental Resources Management Hong Kong Limited, 1999a); Lam Tei area (Environmental Resources Management Hong Kong Limited, 1999b); Pun Chun Yuen Stream, Lam Tsuen River ( Mott Connell Limited, 2000); Tai Chung Hau area, Shuen Wan area, Lin Ma Hang Stream, Sandy Ridge Cemetery, Sha Ling area, Loi Tung area, Sheung Wo Hang Stream, Tai Tong area, Cheung Po Stream, Wang Tong River, Sham Wat Stream ( Chan, 2001); Tai O River (Ove Arup & Partners Hong Kong Limited, 2002); Sha Ha Stream, Pak Kong River (Maunsell Consultants Asia Limited, 2004); Kam Tin River (Black & Veatch Hong Kong Limited, 2005; DSD, 2021); Sam Dip Tam Stream, Tso Kung Tam Stream (Mott Connell Limited, 2005); Luk Tei Tong River (Maunsell Consultants Asia Limited, 2005a); Lam Tin area (Maunsell Consultants Asia Limited, 2005b); Siu Ma Shan area (Black & Veatch Hong Kong Limited, 2006); Nam Long Shan area (within Ocean Park) (Maunsell Environmental Management Consultants Limited, 2006); Mai Po Nature Reserve (WWF, 2006; WWF, 2021); Man Uk Pin Stream (Black & Veatch Hong Kong Limited, 2007); Lung Mei area (Halcrow China Limited, 2007); Wo Shang Wai area (Mott Connell Limited, 2008); Fung Lok Wai area ( CH 2M HILL Hong Kong Limited, 2008); Tsang Tsui area (Metcalf & Eddy Limited, 2008); Sha Lo Wan area, Pak Mong area (Ove Arup & Partners Hong Kong Limited, 2009); Big Wave Bay Stream ( DSD, 2010); Hok Tau Reservoir, Kowloon Reservoir, Pok Fu Lam Reservoir, Shek Lei Pui Reservoir, Tai Tam Tuk Reservoir ( Lai, 2011; current survey); Tei Lung Hau area (Ove Arup & Partners Hong Kong Limited, 2011); Kong Nga Po area (Mott MacDonald Hong Kong Limited, 2013); Fanling area, Kwu Tung area (Ove Arup & Partners Hong Kong Limited, 2013b); Cheung Chau Island area (Atkins China Limited, 2013); Tai Sheung Tok area (Ove Arup & Partners Hong Kong Limited, 2014); Muk Kiu Tau Tsuen area, Nam Hang Pai area, Shan Ha Tsuen area, Lam Hau Tsuen area, Shap Pat Heung area, Shek Tong Tsuen area (Ove Arup & Partners Hong Kong Limited, 2017); Tseng Lan Shue area (Black & Veatch Hong Kong Limited, 2018); Nam Sang Wai area (Black & Veatch Hong Kong Limited, 2020a; current survey); Nam Wa Po area (DSD, 2020); Pak Tin area (Tai Wai) (AECOM Asia Company Limited, 2021a); Nai Chung Stream (AECOM Asia Company Limited, 2021b);Tai Po Kau Nature Reserve (AFCD, 2021c); Ma Wat River, Ping Yuen River, Ngong Ping Stream, Ma Tso Lung Stream, Tong Fuk River, Ho Chung River, Pak Ngan Heung Stream, Ngau Tam Mei River, Yuen Long Bypass Floodway, Deep Water Bay Stream, Ping Kong Stream, Wong Lung Hang Stream, Tai Tei Tong Stream, Shek Kong Stream, Sai Kung River, Fo Tan Nullah (DSD, 2021); Tai Po River, Lions Nature Education Centre, Lamma Island area, Kwu Tung Reservoir, San Tin area, Kwun Yam Shan Stream, Kowloon Reception Reservoir (GBIF.org, 2021); Tung Chung River ( Green Power, 2021; current survey); Little Hawaii Stream, Fung Yuen Stream, Tung Tsz Stream, Kau Lung Hang Lo Wai Stream, Heung Yuen Wai Stream, Tsing Tam Tsuen Stream, Yeung Ka Tsuen Stream, So Kwun Wat Stream ( Tsang & Dudgeon, 2021a); Waterfall Bay Stream, Sha Po area, Lau Shui Heung Reservoir, Tai Lam Chung Reservoir, Shing Mun Reservoir, Plover Cove Reservoir, Shap Long Irrigation Reservoir, Hung Shui Hang Irrigation Reservoir, Lam Tei Irrigation Reservoir, Ho Pui Reservoir, Kowloon Byewash Reservoir, Kai Tak River, Aberdeen Lower Reservoir, Aberdeen Upper Reservoir, Wong Nai Chung Reservoir, Tai Tam Reservoir, Tai Tam Byewash Reservoir, Tai Tam Intermediate Reservoir, High Island Reservoir, Wong Nai Tun Irrigation Reservoir, Sham Tseng Settlement Basin, Shek Pik Reservoir, Yi O Stream, Kau Ling Chung Stream (current survey).

Native range. Central and North America.

Remarks. The most widespread non-native fish in Hong Kong, and was released by the Hong Kong Government for mosquito control around 1940 ( Dudgeon & Corlett, 2004).

Figures

Fig. 43. Gambusia affinis, 23.9 mm SL female (top), Lam Tsuen River, 18.2 mm SL male (bottom), Lin Au Stream.