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Spawning and Captive Propagation of Blackside Dace, Chrosomus cumberlandensis

机译：黑边D（Chrosomus cumberlandensis）的产卵和圈养繁殖

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摘要

Chrosomus cumberlandensis (Blackside Dace) is a federally protected stream fish endemic to the upper Cumberland River drainage of Kentucky and Tennessee. Captive propagation of the species has been conducted in only one previous study. Here we report new findings from spawning and rearing the species for the past three years, 2011-2013, at the Conservation Fisheries, Inc. (CFI) facility in Knoxville, TN. Brood stock (n = 80 adults) were collected in 2011-2012 from Big Lick Branch in Pulaski County, KY. Spawning at the CFI facility occurred in April and May of each year when CFI water temperatures were between 16 and 21 ℃. We compare CFI spawning dates and temperatures to those measured in a 2006 field study. We also provide video footage of spawning behavior, which conformed to that previously described in the literature. Per capita production of fry (i.e., number of juveniles reared per breeding adult) in 2012 was more than twice that achieved in the previous study. We progressively reduced the presence of (and cues from) other fish species in 2011, 2012, and 2013, with the eventual achievement of having Blackside Dace spawn completely independent from any heterospecific cues. Our results collectively increase the capacity to propagate Blackside Dace in captivity to support ongoing recovery efforts for this threatened species.
机译：Chrosomus cumberlandensis（Blackside Dace）是肯塔基州和田纳西州的坎伯兰河上游流域特有的受联邦政府保护的stream鱼。该物种的圈养繁殖仅在先前的一项研究中进行过。在这里，我们报告了过去三年（2011-2013年）在田纳西州诺克斯维尔的Conservation Fisheries，Inc.（CFI）设施产卵和饲养该物种的新发现。 2011-2012年从肯塔基州普拉斯基县Big Lick分支收集了亲鱼（n = 80只成年）。 CFI工厂的产卵发生在每年的4月和5月，CFI水温在16到21℃之间。我们将CFI的产卵日期和温度与2006年现场研究中测得的温度和温度进行了比较。我们还提供了产卵行为的录像，与先前文献中描述的相符。 2012年人均鱼苗产量（即每个繁殖成年饲养的幼鱼数量）是前一项研究的两倍以上。我们逐步减少了2011年，2012年和2013年其他鱼类物种（以及其他鱼类的线索）的存在，最终实现了Blackside Dace的产卵完全独立于任何异源线索。我们的研究结果共同提高了人工繁殖黑边Black的能力，以支持这一受威胁物种的持续恢复工作。

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