Diel Feeding Chronologies in Two Sonoran Desert Stream Fishes, Agosia chrysogaster (Cyprinidae) and Pantosteus clarki (Catostomidae)

21 February 1981

journal article
research article
Published by JSTOR in The Southwestern Naturalist

Vol. 26 (1) , 31-36
https://doi.org/10.2307/3671326

Abstract

Diel feeding chronologies in 2 desert fishes, A. chrysogaster (longfin dace) and P. clarki (Gila mountain sucker), were determined by examining the foregut contents of fishes taken from Sycamore Creek, Maricopa County, Arizona [USA]. A comparison of algae in foreguts with algae collected from the stream suggests that these species have distinct feeding chronologies and foraging areas. P. clarki consumes benthic diatoms and small amounts of detritus; A. chrysogaster feeds on filamentous green algae, benthic and epiphytic diatoms, and detritus. Peaks of ingested food volume indicate that A. chrysogaster is a diurnal feeder; P. clarki feeds both day and night, with crepuscular peaks.

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