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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/46065

Title: Threatened fishes of the world: Squalidus banarescui Chen and Chang
Authors: I-Shiung Chenr
Nian-Hong Jang-Liaw
Yun-Ching Chang
Villien Weiyun Zhang
Kwang-Tsao Shao
Contributors: 國立臺灣海洋大學:海洋生物研究所
Keywords: River Habitat
Aquatic Invertebrate
Black Spot
Riparian Habitat
Main Basin
Date: 2010
Issue Date: 2018-04-26
Publisher: Environmental Biology of Fishes
Abstract: Abstract: Common names: Banarescu’s gudgeon; Ba-Shih-Yin-Ju (Mandarin). Conservation status: Critically endangered for governmental conservation-list, but not listed IUCN Red-list. Identification: D 3+7; P 1+13; A 3+6; LL 34–36; PreD10-11; Ph 5.3-3.5. Body elongate, compressed. Eye large. Mouth terminal. Two short barbels present. Body greenish-silver dorsally, silver-white ventrally. Dorsal side scattered with black spots. Snout with lateral black bar. Each lateral-line scale with L-shaped black mark. Dorsal, caudal fins with minute black spots. A longitudinal shiny-green stripe with 6-7 rounded grey spots. Size 4–7 cm, maximum 8 cm (SL) (Chen and Chang 2007). Distribution: Endemic only in middle to lower reaches of Wu River, Taiwan (Chen and Chang 2007). Abundance: An estimated 6–10 adult individuals per 10 m2 of stream in the densest populations. The fish population has dramatically declined since 2006. Habitat and ecology: Habitat somewhat similar to S. iijimae. Freshwater benthopelagic (0.5–2.5 m) species prefers moderate to warm (20–27oC), weakly alkaline (pH 7.2–8.4), well-oxygenated (DO> 60%), slight turbid (0–250 NTU), rather slow flowing (< 30 cm·s-1) waters in lower and middle stream reaches around 10 –150 m of altitude (Chen and Chang 2005; Chen 2009). Adults prefer feeding on small aquatic invertebrates. Reproduction: No distinct reproductive migration observed. Juveniles appear mainly during March to July. Spawning sticky eggs on vegetation (Chen and Chang 2005). Threats: (1) Riparian habitat serious destruction; (2) illegal electro-fishing; (3) water pollution into the main basin; and (4) severe competition for ecological niches with invasive species like cichlids (Chen 2001). Conservation action: This species has just been listed in the governmental conservation-list of Taiwan as “Critically Endangered” in March 2009. Conservation recommendation: Avoid and eliminate exotic species, protect natural river habitats, restore riparian habitats for the species, prohibit illegal fishing. Remarks: It was mistakenly identified as Squalidus iijimae till 2005 (Banarescu and Nalbant 1973).
Relation: 88(1) pp.63-64
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/46065
Appears in Collections:[海洋生物研究所] 期刊論文

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