Technical Report

Summary of the Rio Grande Silvery Minnow Population Monitoring Program Results From April 2005

URL: https://webapps.usgs.gov/mrgescp/documents/Dudley%20et%20al._2005_Summary%20of%20the%20RGSM%20Population%20Monitoring%20Program%20Results%20from%20April%202005.pdf

Date: 2005/05/12

Author(s): Dudley R.K., Platania S.P., Gottlieb S.J.

Publication: Report prepared for U.S. Bureau of Reclamation, 27 p.

Abstract:

The fourth sampling effort of the 2005 Rio Grande silvery minnow population monitoring program was conducted between 12-14 and 19-20 April 2005 at 20 sites throughout the Middle Rio Grande. Five sites were located in the Angostura Reach, six sites in the Isleta Reach, and nine sites in the San Acacia Reach. A list of collection localities is appended (Table A-1).

Adult and juvenile fish were obtained by rapidly drawing a 3.1 m x 1.8 m small mesh (5 mm) seine through discrete mesohabitats. Rio Grande silvery minnow were counted and identified to ageclass. Other fishes were identified to species and enumerated, but age-class was not determined. Figures illustrating catch rates (number of fish per 100 m2 sampled) were prepared for the ten focal species, including Rio Grande silvery minnow, for the purpose of comparisons between reaches.