TPWD 1959 F-5-R-6 #509: Resurvey and Appraisal of Several Public Waters in Region 3-B, Texas: Job Completion Report, Project F-5-R-6

Report of Fisheries Investigations Resurvey and Appraisal of Several Public Waters in Region 3-B, Texas. by Lawrence Campbell Project Leader Dingell-Johnson Project F-5-R—6, JOb B-22 April 16, 1958 ~ April 16, 1959 H. D. Dodgen - Executive Secretary Texas Game and Fish Commission Austin, Texas Marion Toole Kenneth C. Jurgens & William H, Brown Coordinator Assistant Coordinators rIIIII |I|J JOb Completion Report State of TEXAS Project No. F-g-R—6 Name: Fisheries Investigations and Surveys of the waters of Region 3-B. Job No. B-22 Title: Resurvey and Appraisal of Several Public waters in Region 3—Bz Texas. Period Covered: April 16, 1958 to April 16, 1959 Abstract: Ninety—five gill net collections and fourty-eight seining collections were taken for maintenance of data on waters previously surveyed. Streams were more productive in total fish life, but there was little change in numerical dominance. Improvement of game fish populations in streams is considered to be of a temporary nature. Lakes were not significantly improved and the decline in the fishery yield at Lake J. B. Thomas was particularly significant. The fish population of Mountain Creek Reservoir should be eradicated and the lake restocked with hatchery fish to improve fishing. Excessive veg— etation in Lake Nasworthy should be controlled. Objectives: To determine the present status of waters and fish populations which have been previously surveyed in Region 3-B, under Project F-S-R. Procedure: Two watersheds and eight reservoirs-were resurveyed during the year. Ninety-five netting collections were made. One net set in one location for one twentynfour hour period is recorded as a netting collection. Experimental nylon gill nets, measuring 125 feet in length by eight feet in depth and made up in five 25- -foot sections were used. Mesh sizes of these nets increased progressively in each following section at one- -half inch intervals, beginning with one—inch mesh and terminating with a three-inch mesh section. Seining collections were made with common sense type seines. Findings: Concho River watershed Seining at seven localities in the Conchos indicated that there was a greater abundance of fish life than in previous years, and that game species, primarily large- mouth bass and channel catfish, were increasing in some localities. This favorable trend, however, is entirely dependent upon the longevity of increased rainfall, and the resulting increase in wa_ter volume and stability. Seepage is significant in contributing to this condition and will be of significance only so long as near average rainfall occurs, and is precipitated in a manner similar to that occurring during the present year. Although the annual rainfall has increased during the year, run-off is actually less than in the 1957-58 period. An increase in ground cover resulting from soil utili~ zation practices such as the "soil bank program", and from natural spreading from the increased 1957 rainfall, is responsible.' - Undesirable species have increased numerically if not by percent. The net gain in the total fishery resource is significant, but the basic fishery problem of domination by undesirable species is at best only temporarily relieved. ' San Angelo Reservoir Twelve netting and six seining collections were taken. By percent, undesirable species have not increased during the year. White crappie show significant increases and largemouth bass show a decrease. The gizzard shad population is believed to be more numerous than indicated, and white bass may have increased more than netting results would imply. The present population ratio's are apparently not providing a satisfactory fishery yield, however, the practicality of attempting management procedures at this time is doubted. - Lake Nasworthy Seining was done at six locations on the reservoir. Of the two basic fishery prdblems for this reservoir, domination by undesirable species and excessive vegetation, management effort is recommended for the latter. The construction of a new reservoir appears to be certain. This new impoundment would be above Lake Nasworthy on the Concho watershed and may be completed in the next few years. Until that construction is finally approved it 'is not deemed desirable to attempt to control the fishery populations. Bulrushes and cattails have increased during the past twelve months by more than 37 percent and now prohibit access to about he percent of the lake's shore areas for fishing. For that reason control of this vegetation is_given priority in management and development work. Upper Colorado River Watershed Six seining collections were taken at locations on the river near San Angelo. Rain- fall breaking the drouth in 1957 and a subsequent tremendous increase and expansion of the vegetative cover on the contributing watershed for the Upper Colorado River has re- sulted in ground water increases, seepage contribution to streamways, stability of flow from run-off, and a sustained increase in volume in stream pools. This condition has produced a greater production of fish life. This was especially true for desirable forage species such as redhorse shiners and game species such as flathead and channel catfish. ' There was no noticeable increase percentagewise in the undesirable species, although, river carpsuckers,'carp and others increased in numbers. " & Lake J. B. Thomas Forty—eight netting collections and thirteen seining collections were made. The .rapidity with which desirable game fish populations may reduce to a sub-dominant position to undesirable Species is apparently demonstrated by netting collections from this lake for this year. Fourteen months following the completion of the initial survey work at this reservoir, river carpsuckers had increased numerically from h.60 percent to lh.9h percent, gizzard shad had increased from 36.23 percent to h9.72 percent, and carp had inoreased from 0.2% percent to 2.78 percent. Largemouth bass decreased during the same period from 3.h7 percent to 0.52 percent, white crappie from lh.59 percent to 2.97 percent, flathead catfish from 5.56 percent to 0.82 percent, and sunfishes from 7.76 percent to 1.32 percent. Only white bass and channel catfish showed increases numer— ically, and channel catfish showed a loss in condition. Undesired and excessive populations of gar, shad, carpsuckers, redhorses, and carp made up a total of h2.63 percent of the total fish populations in 1957. In 1958 this game group totaled 67.hh percent. In 1957 channel catfish, flathead catfish, largemouth bass, white bass, white crappie and sunfishes made up 52.09 percent of the total pOpulations. In 1958 this group made up 32.35 percent of the lakes fishery populations. In addition to channel catfish showing a loss of condition over the period, white crappie were also in less desirable condition. Rough fish increased 23.81 percent while game species were being reduced 19.7% percent. Oak Creek Reservoir Twelve netting collections and four seining collections were taken. Significant and relatively rapid increases in river carpsuckers from 15.08 percent to over h2.55 percent as shown in the table may be a result of not having obtained a sufficiently large sample from this reservoir. However,there is little doubt that this species has increased into a critical management problem. The increase in white bass from 1.89 percent to 8.51 percent was about as anticipitated. Although the largemouth bass popu— lation decreased slightly the past twelve months, it has produced excellent fishing for this species,and the general condition of the population is good. Mountain Creek Reservoir Nine gill net sets and five seining collections were made. This reservoir was netted for the first time during the segment with the results shown on the chart. It is recommended that'an eradication program be put into effect as soon as circumstances will permit or justify. ' Lake Brownwood Six gill net sets and five seining collections were made. This reservoir maintains a fairly high fishery yield and there were no significant changes in the fishery popu— lotions. Clear Fork of the Brazos watershed Resurvey work is as included under job completion report for this jOb. Ft. Phantom Hill Reservoir Eight gill nets and five seining collections were taken. Evidence obtained during the segment supported previous findings that this is a borderline case as far as fishery management is concerned. However, the excellent fishery yield from Lake Abilene is regarded as supporting evidence to justify control measures since the area fishermen would not be inconvenienced to the extent previously feared. (i.e. they would have a good place to fish while control measures were in the process of bringing about improvement in Ft. Phantom Hill's fishery populations.) Summary: 1. Ninety—five (95) gill net collections and forty-eight (#8) seining collections were made in waters previously surveyed to maintain data on the fishery populations. 2. Temporary fishery improvement was evidenced in San Angelo Reservoir and in the Concho and Upper Colorado River watersheds. 3. Excessive vegetation has become critical in Lake Nasworthy and in other public waters in Tom Green County. .Control measures are needed and recommended. A. Mountain Creek Reservoir at Robert Lee is dominated by undesirable species and should be eradicated and restocked when time will permit and circumstances justify. 5. Oak Greek Reservoir continues to produce desirable fishing as does Lake J. B. Thomas, however, there is a marked decline in the productivity of the latter reservoir. 6. Lake Brownwood maintaines a desirable fishery yield, however, the lakes production is far below its potential resource. 7. Ft. Phantom Hill.Reservoir is regarded as a borderline case and any increase in undesirable species will warrant serious consideration of a management effort to control these fish. Recommendation: Resurvey work should be continued on as many of the waters previously surveyed as time will permit. Control work on the vegetation in Lake Nasworthy should be done at the earliest possible date. Mountain Creek Reservoir should be eradicated when circum- stances will justify and time will permit. Prepared by Lawrence Campbell Approved by mfl’fl/é Project Leader Director Inland Fisheries Division Date . 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