Hubbard Creek Reservoir - 2003 Survey Report
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Prepared by Spencer Dumont
Inland Fisheries Division
District 1-B, Abilene, Texas
This is the authors' summary from a 22-page report. For a copy of the complete report, use the download link in the sidebar.
Hubbard Creek Reservoir was surveyed in 2003 using electrofishing and trap nets and in 2004 using gill nets. This report summarizes the results of the surveys and contains a management plan for the reservoir based on those findings.
Hubbard Creek Reservoir is a 15,250-acre reservoir, at conservation pool, on Hubbard and Sandy Creeks, tributaries of the Brazos River, and was constructed in 1962 to provide water for municipal and industrial purposes and flood control. Water level steadily declined from 1998 to 2001. Since 2001, water level has remained low and stable at approximately 16 feet below conservation pool. Habitat at time of sampling consisted of rocks, mud flats, standing timber and some aquatic vegetation. Size of reservoir at time of sampling was approximately 7,000 acres.
- Prey species: Electrofishing catch rates of bluegill and sub-stock gizzard shad were 59.0/h and 84.5/h, respectively. Index of vulnerability (IOV) for gizzard shad was good, indicating that 86% of gizzard shad were available to existing predators; this was similar to the IOV estimate in 2001. Electrofishing catch rates of forage-sized gizzard shad were low in 1999, 2001, and 2003 surveys. Bluegill CPUE in 2003 was low, and size structure continued to be dominated by small individuals.
- Catfishes: The gill net catch rate of blue catfish was 2.5/NN, similar to catch rates in 1999 and 1996. Proportional stock density has declined from 39 in 1996 to 20 in 2004. However, the percentage of all blue catfish collected that were 12 inches long or greater has increased since 1999 and was 100% in 2004. The gill net catch rate of channel catfish was 0.83/NN, similar to the catch rate in 1999 and down from the catch rate in 1996. The channel catfish population appears to maintain a low relative abundance with good size structure.
- White bass: The gill net catch rate of white bass was 2.1/NN. Catch rates have been low and variable since 1996. Overall size structure is good as 56% of the fish collected were legal size or bigger.
- Largemouth bass: The electrofishing catch rate of stock length largemouth bass was 30/h in 2003, which was similar to the catch rate in 2001 (26/h) but considerably lower than 1999 (87/h). The PSD has varied considerably since 1999, but the RSD-14 has steadily increased from 7 in 1999 to 23 in 2003. Growth of stock- to quality-sized largemouth bass was good. However, growth of stock- to preferred-sized fish indicates some potential stunting problems as seven age groups are represented in this size group. Body condition was poor (under 90) for preferred-length and smaller fish, but there was some improvement in body condition since 2001. Electrophoresis in 2001 indicated a 50% frequency of Florida largemouth bass alleles with 8% having a Florida largemouth bass genotype.
- White crappie: The trap net catch rate of white crappie was 7.5/NN in 2003. Trap net catch rates of white crappie have been very consistent since 1996. However, the majority of the catch in 1996 was sub-stock fish. The PSD declined from 73 in 1999 to 43 in 2003, with no change in RSD-P. Mean relative weight was over 95 for nearly all size classes. Growth of white crappie was good as the mean length at age 2 was 10.5 inches.
Monitor hydrilla abundance and distribution throughout reservoir.
Performance Report as required by Federal Aid in Sport Fish Restoration Act Texas Federal Aid Project F-30-R-28 Statewide Freshwater Fisheries Monitoring and Management Program