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Production of the Endangered Rio Grande Silvery Minnow, Hybognathus amarus, in the Conservation Rearing Facility at the Los Lunas Silvery Minnow Refugium

Authors

  • Alison M. Hutson,

    1. Los Lunas Silvery Minnow Refugium, New Mexico Interstate Stream Commission, 1000 Main Street NW, Building H, Los Lunas, New Mexico 87031, USA
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  • Louie A. Toya,

    1. Los Lunas Silvery Minnow Refugium, New Mexico Interstate Stream Commission, 1000 Main Street NW, Building H, Los Lunas, New Mexico 87031, USA
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  • Douglas Tave

    Corresponding author
    1. Los Lunas Silvery Minnow Refugium, New Mexico Interstate Stream Commission, 1000 Main Street NW, Building H, Los Lunas, New Mexico 87031, USA
      Corresponding author.
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Corresponding author.

Abstract

This article describes the initial season-long yield trial of raising the endangered Rio Grande silvery minnow, Hybognathus amarus, in the conservation rearing facility at the Los Lunas Silvery Minnow Refugium. Ten thousand fish (90,900/ha) were stocked on June 22, 2010. Production was based on a total of 653 mL (5.936 L/ha) of 11-37-0 N-P-K and 5.5 kg (50 kg/ha) of alfalfa pellets. Fish were harvested in October; almost all were harvested 18–27 October. At stocking, fish averaged 21.7 mm total length and mean weight was 0.10 g. At harvest, fish averaged 48.98 mm and 1.12 g. Fish were sampled monthly, and increased lengths and weights through the study were significant (P = 0.05). Five thousand eight hundred ninety-two fish were harvested (58.92% survival). Yield was 59.99 kg/ha. Temperature, dissolved oxygen (DO), pH, un-ionized ammonia, nitrite, turbidity, alkalinity, and chloride were measured at seven sites throughout the outdoor refugium. Secchi disc visibility was measured in the stream and in the ponds. Only two variables (DO and pH) went outside permitted values, but were easily corrected. Harvest was difficult due to the many different naturalized areas consisting of varying depths, channel widths, and substrates.

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