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1 December 2014 The Effect of Water Temperature on the Growth of Captive Chinese Giant Salamanders (Andrias davidianus) Reared for Reintroduction: A Comparison With Wild Salamander Body Condition
Lu Zhang, Andrew Kouba, Qijun Wang, Hu Zhao, Wei Jiang, Scott Willard, Hongxing Zhang
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Abstract

Chinese Giant Salamanders (Andrias davidianus) have experienced an 80% population decline since the 1950s. Captive salamander farms in China might provide a source population for reintroduction projects involving this species. To provide recommendations on rearing individuals for reintroduction, we studied the effect of water temperature on the growth of captive-reared juvenile (2–6 yr) A. davidianus and compared their body condition with wild specimens. We reared 240 salamanders in two groups, exposed them to different water temperatures for 7 mo, and monitored their growth over the next 3 yr. Subjects that were exposed to lower water temperatures (0.8–19.4°C) were lighter and shorter than those maintained at higher temperatures (7.8–19.1°C). Furthermore, subjects maintained at lower temperatures had a lower growth rate than those maintained at higher temperatures, except for the interval between the last two measurements. Captive-reared salamanders had lower body-condition indices than wild animals having the same body length during the study period. Captive subjects were 16% and 19% lighter than wild individuals of the same length when maintained in the high- and low- temperature groups, respectively. Our study indicates that water temperature affected juvenile growth, and captive-reared A. davidianus older than 5 yr had a body-condition index approaching that of individuals in the wild.

Lu Zhang, Andrew Kouba, Qijun Wang, Hu Zhao, Wei Jiang, Scott Willard, and Hongxing Zhang "The Effect of Water Temperature on the Growth of Captive Chinese Giant Salamanders (Andrias davidianus) Reared for Reintroduction: A Comparison With Wild Salamander Body Condition," Herpetologica 70(4), 369-377, (1 December 2014). https://doi.org/10.1655/HERPETOLOGICA-D-14-00011R1
Accepted: 1 August 2014; Published: 1 December 2014
KEYWORDS
Aquatic salamander
conservation
Cryptobranchidae
energy allocation
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