The Distribution of two mosquito-larvivorous fishes, Gambusia affinis and Oryzias latipes, in the Tokyo Metropolitan area.

Wada, Yoshitake; Sawara, Yuji; Niiyama, Junichiro; Fukabori, Yoshikazu; Nakamura, Yoshimichi; Sakaki, Ikuko

doi:10.7601/mez.25.285

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“…In south China, mosquitofish, with their extraordinary survival ability and tolerance to nearly all pollutants, prevailed over the medaka and threatened local amphibians. The situation can hardly be reversed as the mosquitofish shares the same ecological niches with medaka (Chen, 2002), but may be improved if pollution is properly controlled, as Wada et al (1974) found that Gambusia affinis inhabited in the more or less sewage polluted waters in urbanized regions, while Oryzias latipes in cleaner waters in rural regions in the Tokyo Metropolitan area. The chilly winter in north China can impede further invasion of mosquitofish, thus the more or less intact north Chinese medaka races, with the northmost record in Nunjiang River (Zhang, 1995) and a new record in the northwest China (Zhao, 2006), are promising for propagation and exploitation.…”

Section: Discussionmentioning

confidence: 96%

Ecological studies on medaka in a remained habitat in Qinhuangdao, Hebei, China

2009

Front. Agric. China

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Ecological studies were carried out in the remaining habitat for medaka (Oryzias latipes), a marsh in the suburbs of Qinhuangdao City, Hebei Province, China. Sewage released from villages increases the nutrient levels in open water areas of the marsh, while in cattail (Typha angustifolia) and reed (Phragmites communis) beds the nutrient levels are decreased. There are fewer zooplanktons in the cattail and reed beds than in the open water areas. Sampling fishes with trap nets showed that medaka lived in dense populations in the cattail and reed beds, while the other three fish species, wild goldfish (Carassius auratus), topmouth gudgeon (Pseudorasbora parva), and mud loach (Misgurnus bipartitus), occupied the open water areas in the marsh. A little amount of paradise fish (Macropodus chinensis) was also found in the marsh. Japanese freshwater shrimps (Macrobrachium nipponense) were found only in the influx canal from waterworks. Indoor aquarium experiments showed that the wild medaka in this marsh was easily cultured with commercial feed similar to domesticated strains. Some ecological aspects of the medaka were discussed based on the observations of the fish in the marsh.

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Section: Discussionmentioning

confidence: 96%

Ecological studies on medaka in a remained habitat in Qinhuangdao, Hebei, China

2009

Front. Agric. China

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show abstract

The Distribution of two mosquito-larvivorous fishes, Gambusia affinis and Oryzias latipes, in the Tokyo Metropolitan area.

Cited by 1 publication

References 0 publications

Ecological studies on medaka in a remained habitat in Qinhuangdao, Hebei, China

Ecological studies on medaka in a remained habitat in Qinhuangdao, Hebei, China

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