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Strontium Chloride (SrCl-6H_2O) as a Mass-Marker for Salmonid Otoliths in Alaska

机译:氯化锶(SrCl-6H_2O)作为阿拉斯加鲑鱼耳石的质量标记

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As the number of thermally marked salmonids released from hatcheries increase, fewer mark patterns become available, and the risk of repetitive mark releases increases. Consequently, there is a need to develop alternative, reliable, and cost-effective methods of mass-marking hatchery-raised salmon. We evaluated the usefulness of strontium chloride hexahydrate (SrCI - 6H_2O) to mass-mark salmonid otoliths in Alaska. In 2000, emergent sockeye fry raised at the Gulkana Hatchery, Prince William Sound, Alaska, were exposed to dilute concentrations of SrCl (500, 1,000 and 3,000 ppm) for a variety of durations (2,4, 8, 12, and 24 hours) to determine which protocol resulted in a clear, unambiguous mark. Voucher specimens were collected spring 2001 from each mark group and held for two weeks in collection boxes to allow additional growth to occur on the otolith beyond the strontium mark to eliminate the potential for edge effects that may occur while viewing the mark.
机译:随着从孵化场释放的带有热标记的鲑鱼数量的增加,可用的标记图案越来越少,并且重复释放标记的风险也增加了。因此,需要开发对孵化场饲养的鲑鱼进行质量标记的替代,可靠且具有成本效益的方法。我们评估了六水合氯化锶(SrCI-6H_2O)对阿拉斯加质量标记鲑鱼耳石的有用性。 2000年,在阿拉斯加威廉王子湾的古尔卡纳孵化场饲养的紧急红鲑鱼在各种持续时间(2、4、8、12和24小时)中暴露于稀浓度的SrCl(500、1,000和3,000 ppm)。 ),以确定哪个协议可产生清晰,明确的标记。从2001年春季开始,从每个商标组中收集凭证标本,并在收集箱中放置两周,以使耳石上的锶晶体上发生其他生长,从而消除了查看商标时可能出现的边缘效应。

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