TPWD 1963 F-2-R-10 #868: Fisheries Resurvey of Lake Inks, Job Completion Report, Project F-2-R-10

. JOB COMPLETION REPORT As required by FEDERAL AID IN FISHERIES.RESTORATION ACT TEXAS Federal Aid Project No. F-Z-R-IO FISHERIES INVESTIGATIONS AND SURVEYS OF THE NATERS 0F REGION II-B . Job No. 3—24: Fisheries ReSurvey of Lake Inks Asst. Project Leader: Richard L. White H. D. Dgggen Executive ecretary Texas Game and Fish Commission Austin, Texas Marion Toole Eugene A. Walker D-J Coerdinator Director, Program Planning March 22, 1963 ABSTRACT Lake Inks was resurveyed during the segment. A lake drawdown during February and March of 1962 has retarded the growth of submerged vegetation, notably Myrio- phyllum Sp. A selective treatment for gizzard shed with liquid rotenone was done on Lake Inks under Job 16a35, F-lA-D-S. Rough fish Species decreased 17 per cent by number and 5 per cent by weight of the total fish netted in Inks Lake, presumably because of the reduction in shad following the selective kill. This job will be continued on Inks Lake to aid in the evaluation of the selec— tive treatment. JOB COMPLETION REPORT STATE OF Texas Project No. FeZ-R-lO Name: Fisheries Investigations and Surveys of the waters of Region Z-B Job No. 8-24 _ Title: Fisheries Resurvey of Lake Inks Period covered: February 1, 1962 to January 31, 1963 ' Objectives: To conduct fisheries resurvey of Lake Inks regarding_the fish species present, their relative abundance and ecological factors influencing their distribution. Justification: A resurvey of Inks Lake was conducted during the past segment of Project F~2—R. The resurvey is being continued this segment in order that data collected can be used to evaluate the results of experimental Job E-6, Rough Fish Population Control on Inks Lake. ' I Procedure: Physical and chemical data for Inks Lake, located in Burnet County, are avail- able under Job 8—14, F-2-R-4 (Basic Inventory). Factors which would influence fish distribution, movement, spawning activities, and angling success on Inks Lake were noted during this resurvey period. ' ' Netting Collections were made with 125-foot experimental gill nets. These nets consist of five, 25-foot sections ranging between one-inch and three-inch square mesh, increasing in size by one-half inch per section. During the project period, 96 nets were set at stations established during the basic inventory. Except for February, sets were made each month of the segment. Table’Z shows the catch per net, per foot of net, etc. - I Seining collections were made in June and July of 1962 to determine the survival rate of bass fry in the lake. Inks Lake was stocked by both Federal and State hatcheries as a follow—up to the selective treatment of the lake for gizzard shad with liquid rotenone under Job 16a35, F-14—D—6. The selective treatment was done on March 1, 1962. A checklist of the fish Species mentioned in this report is given in Table 1. Findings: Lake Inks was selectively treated for gizzard shad with liquid rotenone on March 1, 1962 under Project F-14-D—6, Job 16a35. The shad comprised 48.88 per cent by number and 10.57 per cent by weight of the fish collected during the 1961 resur— vey as opposed to 11.11 per cent by weight and 2.34 per cent by number of the fish collected through extensive nettnugimmediately after the selective treatment. This resurvey shows that shad comprised 34.18 per cent by number and 17.11 per cent by -2- weight of the fish collected during this project period. It should be also noted that there was an extensive kill of freshwater drum although this Species was rarely collected in nets. Netting collections for the project period are summarized in_Table 3, and the netting summaries by month are illustrated in Table 4. AS can be seen from these tables, rough fish dominate the catch in both weight and number. The table below Shows the per cent of rough fish by weight and number as deter- mined by experimental netting over the past eight years. The seventeen per cent drOp by number and 5 per cent drOp by weight in the rough fish is presumably corre— lated with the selective Shad treatment. LAKE INKS ROUGH FISH RATIO,_ 1955 - 1962 1955 1956 1957 1958 1959 1960 1961 1962 Per cent rough fish (number) 63 78 63 71 65 70 73 56 Per cent rough fish (weight) 74 74 78 71 74 79 85 80 gSeining collections tended to indicate a fair rate of survival through the fingerling stage of largemouth black bass. A large number of Shad were collected through seining operations during June and July of 1962 indicating a heavy Spawn following the selective kill. The Lower Colorado River Authority, in reSponse to public request, lowered Inks Lake approximately ten feet for a fifteen day period in late February and early March. This drawdown did much to curb the growth of submerged vegetation principally Myriophyllumgsp., which has complicated efforts to fish Inks Lake before. The udrawdown, if it could be done annually and earlier in the year could reduce the vegetation to a desirable level. Recommendations: Although fishermen's reports tend to indicate that the bass fishing on Inks Lake is improved, it is still not at its peak level of 1955. Crappie fishing success is_also much worse than previous years. - It is recommended that this job be continued to further evaluate the results of the selective kill and the massive stocking of largemouth bass. \ Prepared by Richard L. White Approved: 2 EZQZZL; Jfl—f’é _ Asst. Project Leader X Coordinator John'Tilton Regional Supervisor- Date: March 22, 1963 - ' -3- TABLE 1 CHECKLIST OF SPECIES MENTIONED IN REPORT _________________a________________________________________________.________L__*__L_ Scientific Name Common Name .___________a_____________________I_______________a______________in__.___n_am__m______._ Lepisosteus osseus lbngnose gar Dorosoma cepedianum gizzard shad Ictiobus bubalus smallmouth buffalo Carpiodes carpio river carpsucker Notemigonus crysoleucas golden Shiner Cyrpinus carpio ' carp Ictalurus punctatus channel catfish Ictalurus furcatus blue catfish Pylodictis olivaris flathead catfish Roccus chrysops ' white bass Microgterus treculi Texas Spotted bass Micropterus salmoides largemouth black bass Chaenobryttus gulosus warmouth Lepomis cyanellus green sunfish Lepomis microlophus redear sunfish Lepémis macrochirus bluegill sunfish Lepomis megalotis longear sunfish Lepomis humilis orangespotted sunfish] Pomoxis annularis white crappie Aplodinotus grunniens freshwater drum noz.um no. uoz no. uoz “oz usunmu ofiunmo comm .mQH swam .mnH comm nod Hod swam amnmwm.ammmmmow com uoz poem pom muoz .oz ommno>< .oz ommno>< .oz owmno>4 .oz owmno>¢ .mnH nonenz nomenz mo nonenz mo nonsnz noumz mo hoom Noma ho>nnmom Josh mo monnom one mnonanz mo mEHoH cw wcfiuuoz HHHQ mo mmooosm N Mdde -5- TABLE 3 LAKE INKS NETTING RESULTS, 1962 _____________________a________a_________Aa_____—___H___.______u_______________u__ Per Cent Per Cent Species Number of Weight of Number Weight ________________a______________n_______________.______________L_______________a__n__ Longnose gar 50 3.86 222.44 13.31 Gizzard Shad 443 34.18 285.99 17.11 Smallmouth buffalo 99 7.64 447.56 26.78 River carpsucker 101 7.70 288.49 17.26 Golden Shiner 1 0.08 70.16 0.01 Carp - 29 2.24 100.37 6.01 Channel catfish 131 10.11 134.17 8.03 Blue catfish 1 0.08 4.25 0.25 Flathead catfish 4 0.32 17.76 ' 1.07 White bass 52 4.01 49.67 2.98 Texas spotted bass 6_ 0.46 9.51 0.57 Largemouth black bass 64 4.94 59.45 3.56 warmouth 21 1.62 6.24 0.38 Green sunfish 19 1.47 2.19 0.13 Redear sunfish 18 ' 1.39 3.57- 0.22 Bluegill sunfish 206 15.80 24.38 1.45 Longear sunfish 36 2.78 2.80 0.17 Orangespotted sunfish. 1 ' 0.08 0.11 0.01 White crappie 13 1.00 11.47 0.68 Freshwater drum 1 0.08 0.51 0.03 TOTALS 1,296 100.00 1,671.09 100.00 % 00.00H.NON 00.00H he 00.00H Nh 00.00N 00H 00.00N mm 00.00N mm 00.0 IIIIIII 0N mod 00.00H HGH 00.00H NQN 00.00H 00H 00.00N «NH manuOH . .III III! 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