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Rio Grande Silvery Minnow Population Monitoring During April 2021

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Rio Grande Silvery Minnow Population Monitoring During April 2021 RIO GRANDE SILVERY MINNOW POPULATION MONITORING DURING APRIL 2021 A U.S. BUREAU OF RECLAMATION FUNDED RESEARCH PROGRAM 50 50 40 40 Fish per 100 m 2 30 30 20 20 2 Fish per 100 m 10 10 0 0 APR MAY JUN JUL AUG SEP OCT Month - 2021 20 May 2021 RIO GRANDE SILVERY MINNOW POPULATION MONITORING DURING APRIL 2021 A U.S. BUREAU OF RECLAMATION FUNDED RESEARCH PROGRAM Contract 140R4019P0048: Requisition 0040488238 U.S. Bureau of Reclamation Albuquerque Area Office 555 Broadway NE, Suite 100 Albuquerque, NM 87102 Submitted to: U.S. Bureau of Reclamation Albuquerque Area Office 555 Broadway NE, Suite 100 Albuquerque, NM 87102 Robert K. Dudley1,2, Steven P. Platania1,2, and Gary C. White1,3 1 American Southwest Ichthyological Researchers (ASIR); 800 Encino Place NE; Albuquerque, NM 87102 & 2 Museum of Southwestern Biology (Fishes), Biology, UNM; MSC03-2020; Albuquerque, NM 87131 & 3 Fish, Wildlife, and Conservation Biology, CSU; 10 Wagar; Fort Collins, CO 80523 20 May 2021 Rio Grande Silvery Minnow Population Monitoring during 2021 Month: April American Southwest Ichthyological Researchers, LLC 20 May 2021 SUMMARY OF APRIL 2021 POPULATION MONITORING The April 2021 population monitoring efforts were conducted at the 20 standard sites and 10 additional sites. Ten sites were located in the Angostura Reach, ten sites were located in the Isleta Reach, and ten sites were located in the San Acacia Reach. For the 2021 monthly trends, data were based on all sites (i.e., standard, additional, and replacement sites) to maintain consistency across all monthly reports. A list of all collection localities is appended (Appendix A). Adult and juvenile fish were obtained by rapidly drawing a 3.1 m x 1.8 m small mesh (ca. 5 mm) seine through discrete mesohabitats. Larval fish were collected with a 1.0 m x 1.0 m fine mesh (ca. 1.5 mm) seine. All fishes were identified to species and enumerated. We used length-age relationships to assign ages (i.e., age-0, age-1, and age- 2+) to all Rio Grande Silvery Minnow collected. Age-0 individuals are only present, however, after annual spring spawning occurs (ca. April–June). Figures illustrating fish densities (i.e., fish per 100 m2) were prepared for the ten focal species to facilitate comparisons across reaches. Angostura Reach From 16 March to 15 April, provisional mean daily discharge in the Angostura Reach (Rio Grande at Albuquerque, NM; USGS Gage 08330000) averaged 620 ft3/s and ranged from 407 to 1,100 ft3/s. Water temperatures ranged from 10.1 to 17.7 ºC during the Angostura Reach sampling efforts (ca. 0830– 1530 h). Secchi disk measurements of water clarity ranged from 8 to 63 cm. Sampling for fishes in the Angostura Reach during April yielded 2,309 individuals with a cumulative fish density of 44.4 individuals per 100 m2 sampled. The overall sampling effort in the Angostura Reach covered 5,204.8 m2 (surface area) of water. Densities of all fish species combined ranged from 4.2 to 92.1 individuals per 100 m2 at the different sampling sites. In April, there were 9 fish species collected in the Angostura Reach. Red Shiner was the most abundant taxon (n = 1,711), followed by Flathead Chub (n = 264), and Fathead Minnow (n = 95). We collected Rio Grande Silvery Minnow (n = 9) in 6 of the 154 seine hauls that yielded fish, and its overall density was 0.17 (range = 0.00–0.80) individuals per 100 m2. Isleta Reach Provisional mean daily discharge in the Isleta Reach (Rio Grande near Bosque Farms, NM; USGS Gage 08331160), from 16 March to 15 April, averaged 480 ft3/s and ranged from 291 to 603 ft3/s. During the Isleta Reach sampling efforts (ca. 0930–1600 h), water temperatures ranged from 12.3 to 19.3 ºC. Secchi disk measurements ranged from 8 to 18 cm during sampling. Isleta Reach population monitoring efforts produced 5,719 individuals in April with a cumulative fish density of 110.4 individuals per 100 m2 sampled. The total sampling effort in the Isleta Reach during April covered 5,178.9 m2 (surface area) of water. Fish densities (all species combined) at the sampling sites ranged from 39.3 to 385.3 individuals per 100 m2 sampled. There were 9 fish species collected in the Isleta Reach during April. Red Shiner was the most abundant taxon (n = 5,308), followed by Western Mosquitofish (n = 315), and Fathead Minnow (n = 40). We collected Rio Grande Silvery Minnow (n = 7) in 6 of the 173 seine hauls that yielded fish, and its overall density was 0.14 (range = 0.00–0.41) individuals per 100 m2. Page 1 of 32 American Southwest Ichthyological Researchers, LLC Funded by U.S. Bureau of Reclamation Contract 140R4019P0048: Requisition 0040488238 - 1 - Rio Grande Silvery Minnow Population Monitoring during 2021 Month: April American Southwest Ichthyological Researchers, LLC 20 May 2021 San Acacia Reach From 16 March to 15 April, provisional mean daily discharge at San Acacia (Rio Grande Floodway at San Acacia, NM; USGS Gage 08354900) was generally higher (average = 436; range = 197–619 ft3/s) than at San Marcial (Rio Grande Floodway at San Marcial, NM; USGS Gage 08358400) during the same period (average = 257; range = 60–403 ft3/s). Water temperatures in April for the San Acacia Reach ranged from 15.3 to 21.3 ºC (ca. 0930–1600 h). Secchi disk measurements ranged from 9 to 22 cm during sampling. Population monitoring efforts in the San Acacia Reach during April yielded 6,031 individuals with a cumulative fish density of 114.2 individuals per 100 m2 sampled. Sampling in the San Acacia Reach covered an area of 5,279.2 m2 of water. Fish densities (all species combined) ranged from 1.3 to 562.3 individuals per 100 m2 at sites sampled in the San Acacia Reach. In April, there were 10 fish species collected in the San Acacia Reach. Red Shiner was the most abundant taxon (n = 5,949), followed by Western Mosquitofish (n = 40), and Channel Catfish (n = 16). We collected Rio Grande Silvery Minnow (n = 3) in 3 of the 140 seine hauls that yielded fish, and its overall density was 0.06 (range = 0.00–0.20) individuals per 100 m2. Standard Sites During April, sampling covered 10,554.5 m2 (surface area) of water and yielded 10,601 fish. There were no dry sampling sites. Cumulative fish density during April was 100.4 individuals per 100 m2 sampled. The three most common species were Red Shiner (n = 10,082), Western Mosquitofish (n = 134), and Flathead Chub (n = 122). The sampling sites yielded a total of 12 fish species. Rio Grande Silvery Minnow was present in 10 of the 304 seine hauls that yielded fish and at 9 of the 20 sampling sites. Densities of unmarked and marked individuals were 0.09 (n = 10) and 0.00 (n = 0) individuals per 100 m2 sampled, respectively. Densities of age-0, age-1, and age-2+ individuals were 0.00 (n = 0), 0.06 (n = 6), and 0.04 (n = 4) individuals per 100 m2 sampled, respectively. Based on all April surveys since 1993, the overall density of Rio Grande Silvery Minnow averaged 1.89 (range = 0.08– 10.84) individuals per 100 m2 sampled. During April 2021, its overall density was 0.09 (n = 10) individuals per 100 m2 sampled. All Sites During April, sampling covered 15,662.8 m2 (surface area) of water and yielded 14,059 fish. There were no dry sampling sites. Cumulative fish density during April was 89.76 individuals per 100 m2 sampled. The three most common species were Red Shiner (n = 12,968), Western Mosquitofish (n = 409), and Flathead Chub (n = 271). The sampling sites yielded a total of 13 fish species. Rio Grande Silvery Minnow was present in 15 of the 467 seine hauls that yielded fish and at 13 of the 30 sampling sites. Densities of unmarked and marked individuals were 0.11 (n = 17) and 0.01 (n = 2) individuals per 100 m2 sampled, respectively. Densities of age-0, age-1, and age-2+ individuals were 0.00 (n = 0), 0.06 (n = 10), and 0.06 (n = 9) individuals per 100 m2 sampled, respectively. Based on all April surveys since 1993, the overall density of Rio Grande Silvery Minnow averaged 1.89 (range = 0.08– 10.84) individuals per 100 m2 sampled. During April 2021, its overall density was 0.12 (n = 19) individuals per 100 m2 sampled. Page 2 of 32 American Southwest Ichthyological Researchers, LLC Funded by U.S. Bureau of Reclamation Contract 140R4019P0048: Requisition 0040488238 - 2 - Rio Grande Silvery Minnow Population Monitoring during 2021 Month: April American Southwest Ichthyological Researchers, LLC 20 May 2021 Cochiti Reservoir Cochiti Dam (USGS Gage-08317400) : Cochiti Reach San Felipe Gage 22.5 mi Jemez River (USGS-08319000) 36.2 km !. Angostura Diversion Dam : 1- Angostura Dam Angostura Reach !.2- Bernalillo !. 40.8 mi New Mexico 3- Rio Rancho 65.6 km Sandoval County 21 !( 22 !( Bernalillo County ALBUQUERQUE 23!( 24 !( 4- Central Ave. !. (USGS Gage-08330000) Santa Fe County !.5- Rio Bravo Blvd. Torrance County 25 !( Bosque Farms Gage Isleta Diversion Dam (USGS-08331160) : Isleta !( 26 Reach !. 53.1 mi 6- Los Lunas 85.5 km Rio 27!( Puerco !. 7- Belen Cibola County Valencia County !. Socorro County 8- Jarales 28 !( Sevilleta !. 9- Bernardo National Wildlife Refuge 10- La Joya !. 29 !( !. :!.!. 11- North of San Acacia 12- San Acacia Dam San Acacia San Acacia Diversion Dam Reach 13- South of San Acacia (USGS Gage-08354900) 30 !( 63.6 mi 102.3 km Rio Grande !.
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