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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
Sponsored by:Sichuan Society of Zoologists; Chengdu Giant Panda Breeding Research Foundation; Sichuan Association of Wildlife Conservation; Sichuan University
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Your Position :Home->Past Journals Catalog->2017 Vol.36 No.5

Characteristic Re-description of Ricefish Oryzias curvinotus from Guangdong, China
Author of the article:ZHANG Fangfang, JIANG Haochen, JIN Jinjin, QIU Yuping, CHEN Guozhu*
Author's Workplace:National Plateau Wetland Research Center, Southwest Forestry University, Kunming 650224, China
Key Words:Oryzias curvinotus; morphological characteristics; sexual dimorphism
Abstract:The population of ricefish (Oryzias curvinotus) had been significantly declined since the invasive species mosquitofish (Gambusia affinis) widely introduced to China during the recent few decades. As a result, the population of this species in type locality had been extinct. Unfortunately, the researcher had made some big mistake in the description of its holotype, and thus brought big confusions to the researchers during their identification to the Oryzias species in China. In order to rebuild the holotype, relocate the type locality and amend the characteristics descriptions of this Oryzias species, in this paper, we conducted a characteristic re-description of O. curvinotus which were collected from the Huangshanlu National Forest Park and its adjoin zone (Guangzhou city, China), and replenished the chromophotograph of this species. The result showed that the principal identification characteristics of O. curvinotus from other Oryzias species should be as following:anal-fin rays are 19.60±0.80 (19-22), scales in a lateral series are 28.51±0.67 (27-30) and the ratio of pre-dorsal length/standard length is (81.6±1.3)% in total. Meanwhile, the sexual dimorphism of this species also was determined by one way analysis of variance, principal component analysis and discriminant analysis. As the O. curvinotus was greatly threatened by the invasion of mosquitofish, and the invader had also been found in the sites where O. curvinotus populations still remained, we strongly suggest that effective measures are urgently needed to protect the relict populations of this species.
2017,36(5): 564-571 收稿日期:2017-02-21
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