TPWD 1958 F-6-R-5 #423: Resurvey of Waters of Region 8-B: Job Completion Report, Dingell-Johnson Project F-6-R-5, Job B-11

--- Page 1 --- Report of Fisheries Investigations Resurvey of Waters of Region 8-B by Alvin Flury Project Leader Dingell-Johnson Project F-6-R-5, Job B-11 July 1, 1957 - June 30, 1958 H. D. Dodgen - Executive Secretary Texas Game and Fish Commission Austin, Texas Marion Toole Kenneth C. Jurgens & William H. Brown Coordinator Assistant Coordinators --- Page 3 --- Job Completion Report State of TEXAS Project No. F-6-R-5 Name: Fisheries Hetesoo Seat! and Survey of Waters of Region O-B. Job No. B-11 Title: Resurvey of Waters of Region 8-B. Period Covered: July 1, 1957 through June 30, 1958. Abstract: 1. A new dam at Lake Corpus Christi began to catch water during the end of this segment, and the water has cleared to some extent. Most of the water hyacinths have been removed. There seems to be smaller buffalo and more carp than previously. On May 26, 1958, 100,000 largemouth bass fry were stocked. 2. During this segment Casa Blanca Lake came up approximately 11 feet and went over the spillway for the first time. Thermal stratification occurred in deeper waters. “\rpsucker remained the most numerous species netted. Threadfin shad seem to have in- ceased while silversides and bluegills have decreased. Black bass apparently spawned in the spring. 3. The water level on Falcon Lake remained virtually unchanged during this segment. In spite of a good increase in numbers of white bass, from practically nothing to over 15 percent, the general trend of increased numbers of rough fish continued. Procedure: Three bodies of water were resurveyed during this segment: Lake Corpus Christi, Casa Blanca Lake, and Falcon Lake. Netting and seining collections and water analyses were made and general physical and ecological changes were noted. No seining collections were made on Falcon Lake, and water analyses were made only on Casa Blanca Lake. As nearly as possible the netting, seining, and water analyses stations were the same as those used during the original surveys, being changed only as much as necessary to con= form to higher water levels. Turbidity readings by Secchi disk were also made on Lake Corpus Christi at special stations set up for that purpose. t \ Wi Co rol Prepared by Alvin Flur Approved by cg SA ot L- Project Leader Director Inland Fisheries Division te April 13, 1959 --- Page 4 --- Lake Corpus Christi Physical Description: At a spillway level of 74 feet above sea level the lake has an area of about 5450 acres and an estimated volume of 30,000 acre feet when the original survey was made (1953-55). During this segment the Lower Nueces Water Supply District completed a new dam about ¢ mile downstream from the old dam which will raise the water level to 88 feet and produce a lake with an area of about 16,730 acres and a volume of about 185,920 acre feet. The dam is designed so that adjustments and additions to the gates can be made to raise the water level to 94 feet and later to 104 feet. There was no significant change on the lake bottom or shoreline between the original survey and the completion of the new dam. The new dam was dedicated on April 26, 1958, and began impounding water shortly afterward, inundating extensive brush covered flats and plowed fields. By the end of the segment the water had reached a level of 82.26 feet and was still rising rapidly. During the last of February and the first of March a flood occurred on the lake with a crest of 83.89 feet on March first. Although five concrete base slabs were not in place, the new dam restricted the flow and caused this unusually high crest. See Table I for water levels. The water has definitely cleared since the new dam was closed. However, no exact comparison is possible since all measurements made during the original survey were by the Jackson Turbidimeter, while the resurvey data were collected by means of Secchi disk readings. The limits of the Jackson Turbidimeter are 25 ppm., and few of the original survey readings were this clear. All resurvey readings were less than 25 ppm., so the Secchi disk was used instead. Table II shows the turbidity readings and Map I shows the locations of the stations. Aquatic Vegetation: Submerged vegetation is still practically nonexistant, probably due to the high turbidity of the water of the old lake. Emergent rooted vegetation (Scirpus) has grown well, producing several large stands. (See Projects F-6-R-2 and 3, Job E-2.) These will probably be killed by the high water when the lake fills. The most notice- able change on the lake since the original survey is the removal of over 600 of the estimated 700 acres of water hyacinths then present on the lake. Part of this was re- moved by work under Project F-1-D and part by the high water in February and March. Fish Population: The population of fish as shown by gill netting collections has apparently not changed appreciably when compared to the catch during the same months of the original survey. An increase in the number of carp present seems evident from reports of commer- cial fishermen and from our own netting samples. Other apparent changes in numbers of fish are probably due to sampling error inherent in the netting procedure. The small- mouth buffalo is the only species which showed any significant change in average length, --- Page 5 --- eight, or "K" factor. The average weight of the buffalo was about 4 of that found during the original survey, falling from slightly over 23 pounds to slightly over lt pounds. Tables III, IV, and V show the netting results of twelve nets set in the resurvey, and Table VI shows the lengths, weights, and "K" factors of the fish taken. Commercial fish- ing records show 4,951 pounds of buffalo, 160 pounds of carp, and 900 pounds of gar removed during this segment. The seining collections apparently indicate a decrease in numbers of small fish, but no significant change in the relative numbers of the species. Table VII shows the seining collection results. Stocking Records: On May 26, 1958, 100,000 largemouth bass fry from the Tyler Hatchery were released into the upper part of the lake by Game Warden Frank Henze. 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Table VII. Seining Collections on Lake Corpus Christi. Station and Date 1 2 3 4 1 2 3 4 6 7 Species 10-24-57 10-24 10-24 10-29 s11-19)sdl-19)ss1l-19)ss11-19— 11-25 11-25 Total TFS 1 1 71 17 26 - - - 2 = 118 Gs 2 2 1 7 1 1 2 4 1 “ 21 RGT - - 2 1 - - - 6 z- - 9 SMB - - 1 - - - - - - ss 1 Op. em. 36 28 11 30 2 7 23 - ~ - 138 Not. lut. 2 = 13 14 - 8 7 - - - mn Pim. vig. - - - - - - - L - - 1 Gamb. 1 1 2 2 - - - 1 2 - 9 Men. ber. - - 19 14 ac 3 7 5 10 - 65 BGS 1 15 ~ 3 4 - - - - ~ 23 LES - 1 - - - - - - - - 1 WC - 1 - 2 - - - - 2 - 5 RGP 2 - - - - - - - - - 2 Totals ks ke) 120 90 4O 19 39 17 18 fe) 437 --- Page 14 --- le. Casa Blanca Lake . Physical Description: During the original survey (1956-57) the lake averaged about 11 feet below spillway level, and had an area of about 665 acres and a volume of about 5,600 acre feet. On February 18, 1958, the water was two feet below the spillway, and on June 12, 1958, it was at spillway level. At this level the lake has an area of about 1,679 acres and contains about 20,000 acre feet of water. During this segment the water went over the spillway for the first time since the dam was built. The increased water level inundated large areas of new land, most of it sparsely covered with thorny brush, which provides some new cover for fish. The land covered by the lake is mostly caliche, very poor in nutrients, and therefore the shallow water probably will not produce much food but it should provide good spawning grounds. Water Analysis: Water samples taken in June showed a higher oxygen content than before and a lower turbidity. Otherwise there apparently was no change. The difference in turbidity is probably due to decreased wave action on the bottom because of deeper water. At Station No. 1, water from 30 feet down smelled of hydrogen sulfide and contained no oxygen. This, along with a temperature difference of 7° F., indicates that the water was thermally stratified, a condition not found in this lake before. Table VIII shows the results of water analyses. Fish: Population: The river carpsucker is still the most common fish species both by weight and number. It made up 53.90% of the number, and 76.36% of the weight, of fish netted. This is a large increase in percentage by number and a noticeable increase in percentage by weight. Fewer fish per net were caught during the resurvey, probably due to the increased size of the lake letting the fish spread out more. Station No. 2 provided the largest per- centage of fish caught during the resurvey, whereas nets set at Station No. 1 caught more fish during the original survey. Tables IX and X show netting results, while Tables XI and XII show length, weight, and "K" factor. The only seining collections made during the resurvey were in June. Seining Station No. 1 was moved up the same sandy beach with the rise of the water; Station No. 2 moved several hundred yards south and west to find an area free of brush. The sample is too small to be completely reliable, but it seems to indicate that threadfin shad have increased in numbers while silversides and bluegills have decreased. One of the four Rio Grande tetras caught had a hook mark indicating it had been used as bait. The other three were probably released bait also. Thirteen small largemouth bass were sein- ed, indicating a spawn in the spring. Table XIII shows the seining results. --- Page 15 --- bis) €g ‘dway, aty ue uttS AST *Tyooag 0°9 0°9 ‘pd °Q9S6T “ZT aunp ‘sqqnsey stskteuy “qangy, uosyoer 69T O9T 9ST 4ST ZLT O9T “ATV “O “W q fe) g°OT 4 ) Z°OT ) © 0°O 0 - ery fe) ~ Z°tT fe) . 9°6 -aTV -mdd -mdd ‘HaHa ere) 9) Ja7emM BoueTg Bseg oyeT “SCH JO peTTOMS xx "Gg ueyq sseT °s~Teotmayo AYTnNeI ‘7889 ON = €g qh Tg *dmay, “IITA eT9eL ##OE Od OT qydeq uotT}e4g --- Page 16 --- CO*OOT = 00°OOT €9°2 46° HT GL°T St°T 66° 46 TE*6L £9°0 09" t "1M "ON quasieg cugc TTO¢9 00°OOT 00°OOT Seng SOLT RETT TO9T9 Oly 9M Teq4O7, RT El 4g €T Los. 19 €6° 6 geé6tt 6€°6T GO*T2 4 66°9L GT €g°t2 6T *smez3 UT UuaaTS oe SqYyBTOM 3:890N - = 02°€ HE°OT =6Lg’ Le ~=— 0009 std omen % - - gOST 9 ~©6L69 aT USstd sme, ,00°00T O0°OOT 08°96 99°6B EE2S «= C0'0Z_——sSTL ~YBNOY GQ9E S €29sh 2S = Sd, T Ustad ysnoy g9°S hes 19°%. l9o°99 Sere? 4S % uotzeyg S99£ 5 TETLY QS = eQHT S sTe joy, = = ALE S 169 ul OMe = = HETT T = = DHL Ge9E S TOSSh oS Sob T Sou = 2 eel ro - = sp "aM “ON “3M ON °oM “ON € re T satoadg uotyeI1g °9S6T “6T pue QT Atenigeg ‘ayey eoueTg eseg morg S1°N TITO Tequemtsedxy ut usye], ystg Jo sqystem pue sasqunNn ‘XT eTaey “HT --- Page 17 --- 00°0OT 00°O0T HES 69°S T6°S2 LT *OT zg’et = QE" aE On’? 62° OT THT Lit 99°S TH th en QT 69°S 70°SZ = 6SOT 00°2 €S°€T “7M ‘ON queoteg Bed €STtS €6EQT 90° Ly Aa et" gh 9€ 00°O0T 00°OOT ONSE?S 9G2T LOT9 HSe2e “aM 89 TT co te ot ON [e410], ce eh LST 99° LS 996T EQ° HT Ete TEgT LLL SOT “3M Gh Sh ira GS° 4S gt’ gt TT ON a Sh €ett 95° 12 99€ ZE"9 6QuT 99€ “3M suot1e49 29°9S ot et th 00° S2 LT ON oL°6 19°92 T69T 8 O€°06 =EE EL Lyhst ae 90° = cl hh geqLt o€ 9SeT t 926£ 9 961 € Tah q TEE T 4St T LECH a 1695 dL “aM “ON °OS6T ‘€T pue Zl sung ‘ayeyT eoueTg eseg morg S9eN TIT) Lejuemtzsdxg ul usyey, usta jo saustem pue zaquny *smeis UT are 00°Si 00°06 Z8Q 6 00°SZ O0°OT 462 T 66° % OL? HT QLIT OT +62 T gol 9 eT € “OM “ON T °X eTIeL SUUSTOM £840N STA amen % UST A sulepy Ustad ysnoy % Ustad ysnoy % UOTIEIS T2407, doe aM OM#% SDde Raa OD" dieg Sou ey’) satoads --- Page 18 --- Z rf gS°2 Tg@°2 Ge°’]) ge TET SHE 9S 00° LOT Ghz O€T OM € t EE"? €C°~e f°? 00° ETT HETT HETT 00° S9E GOE SOE OHA T T oL°2 62°€ g6°T 12° 269 6SST Z2Qh g9° LTE Gge oLe Sou + € {1 °Z LS*Z gl T 0S°*ZOT OST 09 00° S9T O6T SHT sD qu3stamM ‘ox, Ag ‘Bay “xe “UTW “Bay *xey “UTW “BAY *xey ‘UTH Ssatoadg Ag yuey yuey JOVOBT Ma ‘sus UT 1USTOM yQsue] paepuere "9S6T Azenageg ‘eoueTg ese eye] UT 4ysneD YSTd Jo sxoqoeq ,y,, pue ‘squsTem “yAZueT “IX eTaeL e* --- Page 19 --- Species Gs RCS Carp cc BBH BGS WC RGP Table XII. 17. lengths, Weights, and "K" Factors of Fish Caught in Lake Casa Blanca, June 1958. Standard Length Min. 119 280 305 228 236 106 100 182 180 Max. 145 371 493 320 236 145 280 413 205 Avg. 135.37 322.00 362.50 279«33 236.00 129.00 173.86 274.00 190.00 Min. 33 510 295 200 331 21 33 152 243 Weight in ems. Max. 66 1247 2268 680 3a1 141 539 1531 363 Avg. 92.33 842.43 1084.25 Ahh 67 331.00 80.72 147.91 508.42 314.00 1.95 2.18 1.89 1.69 2.52 1.76 1.87 1.92 4.17 "K" Factor Max. 2.19 2.56 2.25 2.08 2.52 4.62 2.78 2.53 4.88 Avg. 2.07 2.41 2.06 1.88 2.52 3.43 2.36 Rank By No. ime aN ww Rank By Weight --- Page 20 --- Species TFS GS RGT Not. cry. Op. em. Not. lut. Gamb. Men. ber. LMB BGS wc Total Percent 18. Table XIII. Seining Collection Results on Lake Casa Blanca, June 12, 1958. Station 1 2 - 374 a 7 4 = 22 - - 1 1 ws 2 + 56 11 5 8 ~ 4 - 66 90 471 16.04 83.96 Total 374 67 13 66 561 Percent 66.66 1.25 0.71 3.92 0.18 0.18 0.36 11.94 2.32 0.71 11.77 100.00 --- Page 21 --- 19. Falcon Lake Physical Description: The only noticeable change in the physical description of the Falcon Lake is that the water levels were more stable during this segment than during the original survey. The lake stayed nearly full all year, varying approximately eight feet from 284.12 to 291.82 feet above sea level. The minimum variation on any year during the original survey was about 32 feet. Table XIV shows the water levels during the seg- ment. Fish Population: The general trend toward a higher proportion of rough fish noted in the original survey (1954-57) seems to be continuing. Over 79% of the fish by weight and number were rough fish, compared to about 62% for the year ending June 30, 1957, and fewer for the preceding years. This increase seems to be due to a rise in the numbers of freshwater drum and gizzard shad, coupled with a decline of blue catfish. Opposing this trend is the rise of white bass, which have risen from an insignificant 0.32% in the last year of the original survey to over 15% during the resurvey. The white bass are doing extremely well, providing good fishing most of the time. Only seven white bass were caught during the entire original survey, but 51 were caught during the resurvey. Eight of the white bass and one black bass caught at Station No. 9 were caught plug casting. Tables XV and XVI show the numbers and weights of fish caught. Table XVII shows the lengths, weights, and "K" factors. Table XVIII shows the netting success of each lake. --- Page 22 --- Feet Above Mean Sea Level 20. Table XIV, Falcon Reservoir ‘later Levels July 1957 through June 1958 296,4' — Spillway elevation - top of Conservation Pool ~ 73,000 surface acres - 2,400,000 acre-feet, 314,2' = Maximm elevation - top of Flood Storage - 113,000 surface acres - 4,035,000 acre-feet, 2921 eLLEELT LETTE EE DYN em TEUTTTE TET TTT EAT AT eo AN TLL bet TETANY wet NUE EEA EE et HENTAI TTT wt TINE NATE LEENA wt LTTE NET EEE 283 CELE EEE EEE EEE EEE 282 ALLE EEE EEE ELLE EEE EEE EE 1 11 21 31 10 20 309 19 29 9 19 29 818 288 18 28 7 27276 16 26 8 38 28 71727 7 TT 27 6 36 26 July Aug. Sept, Oct, Nov, Dec. Jan, Feb, Mer, Apr. May June 285 1957 1958 --- Page 23 --- 00° OOT 00° O0T 64°22 e}Saae) Lo’? 60° ST 6S°0 99° 2 qT" 96'2 9S°t2 LE*tz bd? 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Ustad omen % USTT emed,y Ustad ysnoy % Ustad ysnoy % uotszeqg TeqOL CM CIM OWI saetoadg --- Page 25 --- Species LNG GS SMB RCS Carp FHC Table XVII. 23. Lengths, Weights, and "K" Factors of Fish Caught in Falcon Lake, March 1958. Standard Length Min. 460 125 180 150 130 157 286 200 209 155 125 Max. 950 273 465 305 275 43 320 275 280 155 336 Avg. 972.50 168.29 264.48 257.60 200.07 231.89 303.00 236.16 2h2.22 155.00 195.62 Min. 320 ho 190 100 71 ho 426 241 193 180 uy Weight in gms. Max. D117 411 3459 680 482 121 709 470 482 180 1134 Avg. 1182.00 107.15 670.95 458.00 231.00 243.00 568.00 372.00 318.00 180.00 201.00 Min. "K" Factor Max. 0.60 2.85 485 2.96 3.23 1.68 2.10 3.44 2.28 4.83 2.99 Avg. 0.37 1.97 3.18 2.56 2.75 1.30 1.96 2.80 2.19 4 83 2.32 Rank By No. 11 Rank By Weight ue --- Page 26 --- ak. Check List of Fish Species Caught Plus Common Names and Abbreviations Lepisosteus | spatula Lepisosteus productus Lepisosteus osseus Dorosoma petenense Dorosoma cepedianum Astyanax fasciatus Ictiobus bubulus Carpiodes carpio Cyprinus carpio Notemigonus erysolucas Opsopoeodus emiliae Notropis lutrensis Pimephales vigilax Ictalurus _ punctatus Ictalurus furcatus Ictalurus melas Pylodictus olivaris Gambusia affinis Menidia beryllina Roccus . chrysops Micropterus salmoides Chaenobryttus gulosus Lepomis macrochirus Lepomis megalotis Pomoxis annularis Aplodinotus grunniens Cichlasoma cyanoguttatum Used in This Report. alligator gar spotted gar longnose gar threadfin shad gizzard shad Rio Grande tetra smallmouth buffalo river carpsucker German carp golden shiner pugnose minnow red shiner parrot minnow channel catfish blue catfish black bullhead flathead catfish mosquitofish tidewater silverside white bass largemouth bass warmouth bass bluegill sunfish longear sunfish white crappie freshwater drum Rio Grande perch AG SG LNG TFS GS RGT SMB RCS Carp Not. cry. Op. em. Not. lut. Pim. vig. CC BC BBH FHC Gamb. Men. ber. WB LMB WMB BGS LES WC FWD RGP --- Page 27 --- Lake and Date Lake Corpus Christi, Oct. and Nov. 1957 Lake Casa Blanca February 1958 Lake Casa Blanca June 1958 Falcon Lake March 1958 Table XVIII. in Terms Number of Number Nets of Feet Set of Nets Set 15 1875 4 500 4 500 10 1250 25. Success of Gill Netting on All Lakes of Numbers and Pounds of Fish Caught. Number Average Average Pounds of Fish Number of Number of of Fish Caught Fish Per Fish Per Caught Net Foot of Net 287 19.13 0.153 261.44 87 21.75 0.174 1h2.97 68 17.00 0.136 51.90 329 32.90 0.263 256.61 Average Pounds of Fish Per Net 17.43 35.74 12.98 25.66 Average Pounds of Fish Per Foot of Net 0.139 0.286 0.104 0.205