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首页> 外文期刊>Lakes & Reservoirs >Effects of river impoundment on body condition and reproductive performance of the Australian native fish, Macquarie perch (Macquaria australasica)
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Effects of river impoundment on body condition and reproductive performance of the Australian native fish, Macquarie perch (Macquaria australasica)

机译：河流蓄水对澳大利亚本地鱼类麦格鲈（ Macquaria australasica ）身体状况和繁殖性能的影响

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摘要

This study attempts to evaluate the influence of the impounding of Lake Dartmouth (36°35′S, 147°31′E; on Mitta Mitta River in Victoria) on the Macquarie perch (Macquaria australasica, Cuvier 1830), an Australian percichthyid fish of riverine origin. In this study the yearly changes in body condition and spawning performance of adult populations in the impoundment were evaluated in relation to lake features, in particular the water level. Body condition of the spawning population of Macquarie perch in Lake Dartmouth, in year n was related to mean annual storage volume of the lake, with a time lag of one year during the post-filling phase of the lake (1991–1997). The influence of condition on the reproductive performance of captive female Macquarie perch from Lake Dartmouth using artificial propagation techniques was evaluated over the period 1991–1997. The mean relative fecundity (mrf), expressed as the number of eggs produced per kilogram of body weight of hypophysed fish, showed a decrease over the period, but the mean weight of hypophysed fish did not decrease over the same time period. The mrf (Ymrf) was positively correlated to yearly mean relative condition factor (XRc), the relationship being:The spawning variables, mean percentage fertilization (Yfn) (1991–1997) and mean larval production (Yln) (1992–1996) in each year (n) were also related to the mean relative condition factor (XRc) of female fish that spawned after hypophysation in each year. It is suggested that the declining success in the artificial propagation of this species is caused by a declining maternal condition of female fish collected from the impoundment, resulting from poor nutrition.
机译：这项研究试图评估达特茅斯湖（36°35′S，147°31′E;维多利亚州的米塔米塔河）的蓄水对麦格理鲈（Macquaria australasica，Cuvier 1830）的影响。河流起源。在这项研究中，评估了水塘中成年种群的身体状况和产卵性能的年度变化与湖泊特征，特别是水位的关系。在第n年，达特茅斯湖麦格理河鲈产卵种群的身体状况与该湖的年均储存量有关，在该湖的后填充阶段（1991-1997年）有一个时滞。在1991-1997年期间，评估了条件对人工繁殖技术对达特茅斯湖圈养的雌性麦格理栖息地繁殖性能的影响。平均相对繁殖力（mrf）表示为每公斤体重不足的鱼类所产生的卵数，在此期间有所下降，但同期体重不足的平均体重并未减少。 mrf（Ymrf）与年平均相对条件因子（XRc）正相关，其关系为：产卵变量，平均受精率（Yfn）（1991–1997）和平均幼虫产量（Yln）（1992–1996）。每年（n）还与每年因水phy不足而产卵的雌鱼的平均相对条件因子（XRc）相关。有人提出，由于营养不良，从该水库收集的雌鱼的母体状况下降，导致该物种人工繁殖的成功率下降。

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  • 来源
    《Lakes & Reservoirs》 |2000年第4期|281-291|共11页
  • 作者

    Scott C. Gray; Sena S. De Silva; Brett A. Ingram; Geoff J. Gooley;

  • 作者单位

    School of Ecology and Environment Deakin University PO Box 423 Warrnambool Victoria 3280 and;

    School of Ecology and Environment Deakin University PO Box 423 Warrnambool Victoria 3280 and School of Ecology and Environment Deakin University PO Box 423 Warrnambool Victoria 3280 and;

    Marine and Freshwater Resources Institute Snobs Creek Private Bag 20 Alexandra Victoria 3714 Australia;

    Marine and Freshwater Resources Institute Snobs Creek Private Bag 20 Alexandra Victoria 3714 Australia;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    body condition; Macquarie perch; reproduction; reservoir;

    机译：身体状况;麦格栖息;繁殖;水库;

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