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首页> 外文学位 >Environmental manipulations for captive Lahontan cutthroat trout increase hatchery egg survival and survival of yearlings stocked in saline, alkaline Walker Lake, Nevada.
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Environmental manipulations for captive Lahontan cutthroat trout increase hatchery egg survival and survival of yearlings stocked in saline, alkaline Walker Lake, Nevada.

机译：圈养Lahontan cut鳟鱼的环境操作可提高孵化场卵的存活率，以及在内华达州碱性Walker Lake咸水中储存的一岁幼鸽的存活率。

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摘要

I investigated the reproductive temperature requirements of captive Lahontan cutthroat trout (Oncorhynchus clarkii henshawi) brood females, and various acclimation protocols for yearling, hatchery-reared Lahontan cutthroat trout stocked in saline, alkaline Walker Lake, Nevada Survival of eggs to the eyed developmental stage, hatching, and yolk-sac resorption was higher when spawned from brood females held in chilled water (7.2°C) from mid December through spawning compared to eggs spawned from females on ambient well water (12.4°C) regardless of whether females were spawned 0, 4, or 7 d post ovulation. Female holding temperature did not appear to affect the timing of ovulation however, fecundity was higher for females held at 7.2°C versus 12.4°C. The hazard of mortality during a week-long challenge in water from Walker Lake, Nevada for eight-month-old Lahontan cutthroat trout reared at Lahontan National Fish Hatchery was lower for fish acclimated 3 and 8 d by gradually increasing the ratio of lake water to hatchery water compared to un-acclimated fish. Increased fork length also reduced the hazard of death. No fish survived the entire week-long challenge, indicating improvements in the acclimation method are necessary. In a second acclimation study, the hazard of mortality for yearling, hatchery-reared Lahontan cutthroat trout during three replicate week-long challenges in saline, alkaline water from Walker Lake was lower for fish acclimated for 17 d at the hatchery in simulated lake water than for un-acclimated fish however, acclimation for 8 d seemed to have no effect. Fish condition factor and fork length were directly correlated to challenge survival. Blood plasma osmolality was elevated in fish not surviving the challenge however, challenge survivors that had been acclimated for 17 d exhibited normal plasma osmolality. These results will facilitate the recovery of Lahontan cutthroat trout in the Truckee-Tahoe and Walker subbasins.
机译：我调查了圈养Lahontan th鳟（Oncorhynchus clarkii henshawi）雌性雏鸡的生殖温度要求，以及内华达州碱性沃克湖（Walker Lake），内华达州盐碱化孵化的一岁，孵化场饲养的Lahontan th鳟的各种驯化方案，与从雌性在环境井水（12.4＆degC）上产卵相比，从12月中旬开始产卵的雌性卵从12月中旬开始孵化，卵孵化率更高，卵黄囊吸收更高。 ，或排卵后7天。雌性保持温度似乎不影响排卵时间，但是，雌性保持在7.2°C与12.4°C相比，生殖力更高。在内华达州沃克湖中进行为期八个月大的拉洪坦3鱼鳟鱼在内华达州沃克湖的水中进行为期一周的挑战时，通过逐渐增加湖水与孵化场的水与未驯化的鱼相比。货叉长度的增加也减少了死亡的危险。没有鱼在整个一周的挑战中幸存下来，这表明有必要改进驯化方法。在第二次适应性研究中，孵化场饲养了17 d的鱼类在模拟湖水中驯化的孵化场在盐水，碱性水中进行了3次重复一周的挑战，对一岁孵化场饲养的Lahontan cut鳟鱼造成的死亡危险低于在孵化场适应了17天的鱼类但是，对于未适应环境的鱼，适应8天似乎没有任何效果。鱼类状况因素和叉子长度与挑战生存率直接相关。鱼类的血浆渗透压（渗透压）升高，未通过挑战生存，但是，适应了17天的挑战存活者的血浆渗透压（渗透压）正常。这些结果将有助于在特拉基-塔霍和沃克分流盆地恢复Lahontan残酷的鳟鱼。

著录项

  • 作者

    Bigelow, John P.;

  • 作者单位

    University of Nevada, Reno.;

  • 授予单位 University of Nevada, Reno.;
  • 学科 Agriculture Wildlife Conservation.Agriculture Fisheries and Aquaculture.Agriculture Animal Culture and Nutrition.
  • 学位 M.S.
  • 年度 2010
  • 页码 79 p.
  • 总页数 79
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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