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1 December 2009 Foods of Age-0 Rio Grande Silvery Minnows (Hybognathus amarus) Reared in Hatchery Ponds
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Abstract

We examined contents of alimentary canal from pond-reared Rio Grande silvery minnows (Hybognathus amarus; n  =  183) to determine frequency of occurrence for foods consumed among small (9–20 mm), medium (21–35 mm), and large fish (36–75 mm). Among 183 fish, 19% (n  =  34) of alimentary canals were empty. Of those with food items (n  =  149), insects were the most common and were present in 66% of fish, followed by formulated feed (60%), diatoms (40%), cladocerans (36%), rotifers (35%), filamentous algae (32%), bryozoan statoblasts (19%), copepods (11%), protozoa (9%), plant material (9%), ostracods (6%), detritus (5%), and sand (4%). Among size groups, small and medium fish consumed a greater variety of foods than large fish. Information on contents of alimentary canal of pond-reared Rio Grande silvery minnows will aid in refining culture techniques for this federally listed endangered species.

Jacqueline M. Watson, Catherine Sykes, and Timothy H. Bonner "Foods of Age-0 Rio Grande Silvery Minnows (Hybognathus amarus) Reared in Hatchery Ponds," The Southwestern Naturalist 54(4), 475-479, (1 December 2009). https://doi.org/10.1894/GG-33.1
Received: 28 March 2008; Accepted: 1 May 2009; Published: 1 December 2009
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