TPWD 1959 F-6-R-6 #514: Resurvey of the Waters of Region 8-B, Job Completion Report, Dingell-Johnson Project F-6-R-6, Job B-11

--- Page 1 --- Report of Fisheries Investigations Resurvey of the Waters of Region 8-B. by Charles Menn Assistant Project Leader Dingell-Johnson Project F-6-R-6, Job B-11 July 1, 1958 - June 30, 1959 H. D. Dodgen = Executive Secretary Texas Game and Fish Commission Austin, Texas Marion Toole Kenneth C. Jurgens & William H. Erown Coordinator Assistant Coordinators --- Page 3 --- Job Completion Report State of TEXAS Project No. F-6-R-6 Name: fisheries Investigations and Surveys of the Waters of Region O-B. Job No. Beil Title: Resurvey of the Waters of Region 8-B. Period Covered; July 1, 1958 = June 30, 1959 Abstract: During the period from July 1, 1958 through June 30, 1959, five lakes including Falcon Lake, Lake Corpus Christi, Bentsen State Park Lake, Llano Grande Lake, and Campacuas Lake were resurveyed. In Falcon Lake, rough fish appeared to be increasing in numbers but decreasing in weights. Water levels varied approximately 20 feet during the first half of this seg- ment. This was generally higher than in the previous segment. The rough fish in Lake Corpus Christi appeared to be increasing in numbers although sports fishermen continued to have better than average success in catching black bass ind white crappie. The lake level remained relatively constant during the year, varying less than 10 feet, as compared to the previous year's fluctuation of about 15 feet. The deeper water of the new lake aided in clearing up the water, to some extent, which will be favorable to the black bass population. A total of 164,000 black bass fingerlings and fry and 6,000 channel catfish fingerlings were planted in the lake during the year to supplement the existing population. Three netting collections made on Bentsen State Park Lake during this segment indicate that rough fish at present dominate the fish population as a result of intro= ductions from the Rio Grande River during the fall flood cf 1958. A complete kill of fish should be made and the lake restocked with game fish. Netting samples on Liane Grande and Campacuas Lakes, after rotenone treatment, showed that rough fish were greatly reduced in numbers and weights but a complete kill of fish was not obtained. A total of 10,900 channel catfish fingerlings was stocked in Campacuas Lake and a total of 20,000 channel catfish and 10,500 black bass finger- lings was stocked in Llano Grande Lake. Objectives: To determine the present status of waters and fish populations which have been previously surveyed in Project F-6-R. Procedure: Fish samples were collected By means of standard experimental gill nets and small mesh minnow seines in Falcon Lake and Bentsen State Park Lake; only netting collections --- Page 4 --- were made on Lake Corpus Christi and Llano Grande and Campacuas Lakes. Netted specimens were weighed and measured in the field. Sex, state of sexual development and the occurrence of parasites of the individual specimens were also noted and recorded in the field. Seined specimens were preserved in 10% formalin and taken to the regional fisheries laboratory for identification. Findings: Falcon Lake During the segment period 14 gill net and 4 seine collections of fish spec- imens were made on Falcon Lake. All of the nets were set at the surface in water ranging from 10 to 70 feet in depth. Of the 14 gill net collections, 2 were made in August 1958 and 12 were made in March 1959. The results of the gill net collections are presented in Figures 1 through 4. Those of the seine collections are given in Figure 5 and the variations in lake level are shown on the chart in Figure 6. On the basis of netting data collected in March 1959, compared with comparable data collected in March of 1958 (see Tables XV and XVI, Job Completion Report for Job B-11, Project F-6-R-5) it appears that the relative abundance of those species con- sidered rough fish continue to increase. They comprised 79.29 percent of the fish netted in March 1958 and increased to 82.88 percent of the fish netted in March 1959. The relative weight of these species, however, has decreased. Of the fish species netted during March 1959, there were four noticeable changes compared with the data for netting in March of 1958. Gizzard shad, Dorosoma cepedianun, increased in the net catch from 23.37 percent of the total fish netted to 62.06 per- cent. This was an increase of 38.69 percent of the total fish taken in nets. Similarly this species increased 6.57 percent of the total weight of the netted fish. The long- nose gar, Lepisosteus osseus, increased by 10.81 percent of the total number and 28.91 percent of the weight. The smallmouth buffalo, Ictiobus bubalus, on the other hand, decreased 19.82 percent of the number and 33.04 percent of the weight. The only other significant change was the reduction in the relative abundance of white bass, Roccus chrysops, in the total fish netted. White bass dropped 9.11 percent by number and 12.34 percent by weight compared with data for the same period in 1958. The apparent increases and reductions in relative abundance and weight of the species mentioned may be explained in part by the fact that all of the nets set in March of 1959 were surface sets. This would account for the larger number of longnose gars taken and would be reflected in number and weight figures. Since no comparable data exists for August of 1957 the data collected for August 1958 need not be mentioned except to point out that they also indicate a relatively large number of rough fish in Falcon Lake. In the four seining collections made on Faicon Lake in March 1959, tidewater silversides (Menidia beryllina), the most abundant species collected, comprised 78.59 percent of the total number and threadfin shad (Dorosoma petenense) comprised 18.91 percent. Redhorse shiners (Notropis lutrensis), sea pupfish (Cyprinodon variegatus ) and black bass (Micropterus salmoides) combined comprised only 2.5 percent of fish taken in the seine collections (Figure 5). No earlicr comparable seine collections were available. --- Page 5 --- Water levels varied approximately 21 feet during the period from July through December 1958, Water levels, recorded at 10-day intervals, given in Figure 6, indicate the lake was lowest during the latter part of August and highest in mid- October. The water levels for the second half of this segment will be included in the Completion Report for Job B-11, Project F-6=R-7. Lake Corpus Christi During October and November 1958, a total of 15 experimental gill nets were set in Lake Corpus Christi. The 400 fish, of 15 species, taken in the gill net collections are shown by species in Figure 7. The minimum, maximum and average lengths, as well as the weight ranges (in grams) and "K" factors of these fish are presented in Figure 8. Of the 400 fish collected, game fish comprised approximately 38 percent of the total number and 25 percent of the weight. In comparing these results with comparable data for 1957, game species showed a slight decrease in numbers and weight (see Job Completion Report, Job B-11, F-6-R-5, Tables III and IV). According to the netting samples, two significant changes regarding the rough species occurred. Spotted gar, Lepisosteus productus, increased by 12.36 percent of the total fish netted and gizzard shad, Dorosoma cepedianum, decreased by 7.72 percent. Similarly, channel catfish, ictalurus punctatus, showed an increase of 6.38 percent and white crappie, Pomoxis annularis, decreased 7.48 percent. In spite of the apparent decrease in overall game fish numbers, sports fishermen report taking large numbers of largemouth bass (Micropterus salmoides) and white crappie. Water level data for Lake Corpus Christi, obtained from the Lower Nueces River Water Supply District, were fairly constant as compared with those for the previous year. The lowest level, recorded on July 1, 1958, was 82.61 feet above mean sea level. This was at a time when the new lake was beginning to fill. The highest level, 89.58 feet, was recorded on October 9, 1958. Figure 9 contains water level data for Lake Corpus Christi, recorded at 10-day intervals, for the period from July 1958 through dune 1959. The crest of the new dam, completed in April 1958, is 88 feet as compared to the 74 foot crest of the old dam. The water in the lake, during this segment, was con- siderably clearer than in the previous segment probably cue to enlargement of the Lake, the addition of approximately 14 feet of water, end a relatively constant lake level. The clearer water, within limits, should provide better bass fishing due to better conditions for spawning and growing. Turbidity readings, in terms of light penetration in inches measured with a Secchi disk, were made on the lake at special stations set up for that purpose. Figure 11 gives the Secchi disk readings made in July 1958, and March 1959. After filling and flood silts settled, the lake had a brown discoloration probably due to decaying organic substances of the new lake bottom. A total of 29 readings was made at 17 stations during the year (Figure 10). The minimum reading was 19 inches and the maximum was 44 inches, with a mean average reading of 26.19 inches. In previous work, it was found that the minimum reading was 9 inches and the maximum was 28 inches with an average of 11.56 inches. A total of 16 water analyses were made at five locations on the lake during Jetober and November, 1958 (Figure 10). The water samples, taken from the surface and, where possible, down to 30 feet in depth were analyzed for oxygen, carbon dioxide, methyl orange alkalinity, ph-th alkalinity, and pH. The results of these tests, giyen --- Page 6 --- in Figure 12, are normal for this region and apparently are little different from the old lake. A total of 164,000 largemouth bass and 6,000 channel catfish was stocked in the lake during the year. On July 11, 1958, 14,600 fingerling bass were stocked in the upper part of the lake where sufficient cover and food were available. These fish were obtained from the Medina State Fish Hatchery. On March 10, 1959, 150,000 black bass fry from the Olmito State Fish Hatchery were stocked at four locations on the lake to supplement the existing population. Also, 6,000 channel catfish fingerlings from the Olmito State Hatchery were stocked on October 21, 1958. Bentsen State Park Lake A total of 70 fish of 8 species was taken in three experimental gill nets during this segment. The netting samples showed that rough fish comprised 80.00 percent of the total number and 86.62 percent of the weight. The three gill nets were set in water ranging from 6 to 24 feet in depth. During the basic survey, made in 1954 and 1955, largemouth bass were reported present, but in small numbers. None was taken by gill nets or minnow seines during the present resurvey. In October and November 1958, high floodwaters on the Rio Grande River, less than a mile from the lake, overflowed into this ox-bow lake and probably caused considerable changes in the fish population. Blue catfish (Ictalurus furcatus) was the only game species found in this resurvey, and they comprised 20.00 percent of the total fish netted. Figure 13 presents the results of netting collections including the numbers and weights of the fish taken by species. The minimum, maximum and average lengths as well as the "K" factors of the fish taken in these collections are shown in Figure 14. A total of 430 fish of 9 species was taken in two seining collections using a 20-foot "common sense" minnow seine, 4-feet deep with j-inch mesh. The most abundant species taken was Gambusia affinis which comprised 77-44 percent of the number. Figure 15 shows the numbers and percent of fish taken in the two seining collections made in April 1959. In view of the large percentage of rough fish present, this lake should be chem- ically treated to remove the present fish population and desirable game fish restocked. Since immediate danger of a major flood seems slight, renovation of Bentsen State Park Lake should result in a very good and popular fishing lake. Llano Grande and Campacuas Lakes Two natural lakes lying in the Llano Grande Floodway, Campacuas and Llano Grande Lakes, were chemically treated with 5% rotenone in May 1959 (Project F-14-D, Job léa- 18) to remove the existing fish population which was found to be approximately 89.00 percent rough fish and 11.00 percent game fish (Project F-6-R-6, Job B-12; Table III, page 13). Approximately one month after the treatment of these lakes, nine experimental gill nets were set in Campacuas Lake, which took a total of 24 fish of 8 species. The ten nets set in Llano Grande Lake took 69 fish of 6 species. All fish taken, with the exception of the warmouth bass (Chaenobryttus gulosus), are considered undesirable --- Page 7 --- species. Figure 16 gives the numbers and weights of fish taken in Campacuas Lake in June 1959. European carp (Cyprinus carpio), warmouth bass, and Rio Grande cichlid (Cichlasoma cyanoguttatum) were found to be the most abundant species present in the lake after the chemical treatment. Figure 17 gives the numbers and weight of fish taken in Llano Grande Lake in June 1959. According to this table, alligator gar (Lepisosteus spatula), gizzard shad, and carp were the most numerous fishes taken. It is apparent that a total kill of fish in both lakes was not obtained, but large numbers of undesirable fish were removed. Figure 18 shows the success of netting in Campacuas and Llano Grande Lakes in June 1959. According to this table, an average of less than 5 fish per net were caught as compared to over 25 fish per net before the chemical treatment (Project F-6-R-6, Job B-12; Table VIII, page 18). On June 24, 1959, 20,000 channel catfish fingerlings were stocked at six locations on Llano Grande Lake and 10,000 channel catfish fingerlings (about 1 to 14 inches long) were stocked at 4 locations on Campacuas Lake. On June 25, 1959, 10,500 black bass fingerlings (approximately 2 to 4 inches long) were stocked at six locations in Llano Grande Lake. Black bass for stocking Campacuas Lake were unavailable during this report period. Four Secchi disk readings, which were taken on Campacuas Lake during this resurvey, showed that the water was a little clearer after the treatment but not as clear as had been expected. Wave action and the few remaining fish probably contributed to the turbidity. The Secchi disk readings ranged from 104 to ll inches as compared to 8 inches during the basic survey. No additional water analyses were made on Campacuas Lake. Six Secchi disk readings were taken on Llano Grande Lake during this resurvey; they ranged from § to 26 inches as compared to 54 to 11 inches before the treatment of the lake. Llano Grande Lake had a green, "bloom" appearance during this resurvey. This was probably due to the influx of waste water from the City of Mission sewage treatment plant upstream. Figure 19 shows the success of gill netting on the five lakes resurveyed this segment. According to this table, almost twice as many fish were taken in gill nets as the previous resurvey on Lake Corpus Christi using the same number of nets. Prepared by Charles Menn Approved by Y: VAP COT fr aote- Assistant Project Leader Director Inland Fisheries Division Date January 28, 1960 --- Page 8 --- Species Lepisosteus spatula Lepisosteus osseus Dorosoma petenense Dorosoma cepedianum Ictiobus bubalus Carpiodes carpio Cyprinus carpio *Ictalurus punctatus ¥Ictalurus furcatus *Roccus chrysops *Micropterus salmoides *Chaenobryttus gulosus *Pomoxis annularis Totals Total Rough Fish Percent Rough Fish *Total Game Fish *Percent Game Fish Figure l. Netting Results, Falcon Lake, March 1959. Number 61 301 nN f BM RWO OF OW WW 485 402 83 Percent of Total Number 0.82 12.58 0.41 62.06 4.74 0.62 1.65 Weight (Lbs. ) 112.96 159.58 0.30 62.59 63.57 4.56 6.27 1.87 24.62 16.36 4.28 0.25 0.49 457.70 409.83 47.87 Percent of Total Weight 24.68 34.86 0.07 13.67 13.89 1.00 1.37 O.41 5.38 3.57 0.94 0.05 0.11 100.00 78.89 21.11 --- Page 9 --- Figure 2. Lengths, Weights and "K" Factors of Fish Caught in Falcon Lake, March 1959. Species Lepisosteus spatula Lepisosteus osseus Dorosoma petenense Dorosoma cepedianum Ictiobus bubalus Carpiodes carpio Cyprinus carpio Ictalurus punctatus Ictalurus furcatus Roccus chrysops Micropterus salmoides Chaenobryttus gulosus Pomoxis annularis * Lengths in millimeter - Indicates only one fish Standard Length* Min. 856 WS 130 115 210 2hg el 185 160 220 Max. 1,270 810 170 625 470 300 251 360 350 275 338 148 200 Avg. 1,077.75 676.65 150.00 166.68 326.45 279.33 233.62 360.00 233.47 203.21 289 . 33 148.00 200 .00 To Weight in Grams Min. Ts fit 352 72 avi Max. 21,773 2,296 96 Avg. 12,821.25 1,166.28 69.00 98.94 1,255 45 524.00 356.37 851.00 201.40 241.65 648.00 112.00 200.00 Min. i e oO (eo) — @m fe OD ht oF SO ORD ht fee) (oo) n> \O WA 1.17 2.25 2.38 3.45 "K" Factor Max. Avg. 1.06 0.94 1.45 0.44 2.18 2.01 2.98 2.02 4.0L 3.36 3.17 3.09 3.26 2.64 1,82 1.82 1.70 1.39 2.98 2.63 2.54 2.47 3245 3.45 2075 2.75 --- Page 10 --- Figure 3. Netting Results, Falcon Lake, August 1958. Species Number Percent of Weight Percent of Total Number (Los. ) Total Weight Lepisosteus spatula 9 16.36 110.83 64.66 Lepisosteus osseus 16 29.09 32.18 18.78 Dorosoma cepedianum 8 14.55 1.64 0.96 Ictiobus bubalus 8 14.55 16.17 9.43 Carpiodes carpio 3 5.45 3.68 2.15 *Ictalurus furcatus 6 10.91 5.13 2.99 *Roccus chrysops 5 9.09 1.77 103 Total 55 100.00 171.40 100.00 Total rough fish 4h 164.50 Percent rough fish 80.00 95.98 *Total game fish 11 6.9 *Percent game fish 20.00 4.02 --- Page 11 --- Figure 4. Lengths, Species Lepisosteus spatula Lepisosteus osseus Dorosoma cepedianum Ictiobus bubalus Carpiodes carpio Ictalurus furcatus* Roccus chrysops* ¥Game fish *£Length given in millimeters Weights and "K" Factors of Fish Caught in Faicon Lake, August 1958. Standard Length** Min. Max. Avg.. 760 d15 130 270 210 199 Lod 935 822 210 356 300 a3 879 618 166 299 262 288 179 Weight in Grams Min. 3,742 482 39 620 281 96 71 Max. 7,343 1,843 171 1,588 709 879 423 Avg. Ds091 913 93 917 dot 388 160 Min. 0.76 0.33 1.65 2.79 2.52 1.22 "K" Factor Max. Avg. 0.90 0.81 0.50 0.37 1.91 1.81 3.65 3.33 3.41 2.99 1.69 1.38 2.71 2.32 2.04 --- Page 12 --- de Figure 5. Seining Results, Falcon Lake, March 13-14, 1959. Species Sta. Sta. Sta. Sta. Total Percent A B C D by No. Dorosoma petenense @) ¢) 15 Liy 129 18.91 Notropis lutrensis Q @) 0 1 1 0.15 Cyprinodon variegatus ) 9) 14 1 15 2.20 Menidia beryllina 14 13 209 300 536 78.59 Micropterus salmoides 8) 1 1) 0 1 0.15 Totals 14 14 238 416 682 100.00 --- Page 13 --- Level ot o uw mean t eet Above my A Lie Figure 6, Falcon Lake Water Levels, July, 1958 through December, 1958 296.4! = Spillway elevation - top of Conservation Pool - 78,000 surface acres - 2,400,000 acre-feet 314.2! = Maximum elevation - top of Flood Storage - 113,000 surface acres ~ 4,085,000 acre-feet 310! ws LLL IN FEL PP ING ET eo LTE LLL NEL os LLL | wo LLL ALLE EEE 285 wo EEE EEE EEE oo LITE eo LLL os EET LEE EEE EEE w LLU LUE 1 11 21 31 19 20 30 9 1929 919 29 818 28 8 18 28 July Aug, Sevt, Oct, Nov, Dec, 1958 --- Page 14 --- Figure 7. Netting Results, Lake Corpus Christi, October & November 1958. Species Number Lepisosteus spatula 20 Lepisosteus productus 56 Lepisosteus osseus 14 Dorosoma cepedianum 19 Ictiobus bubalus ks Cyprinus carpio 16 *Ictalurus punctatus 43 *Ictalurus furcatus 34 Ictalurus melas 1 *Micropterus salimoides iL *Chaenobryttus gulosus 1 Lepomis macrochirus 1 ¥Pomoxis annularis 15 Aplodinotus grunniens 70 Cichlasoma cyanoguttatum ye Totals 400 Total rough fish 237 Percent rough fish *Total game fish 163 *Percent game fish 12. Percent of Total Number 5,00 14.00 3.50 4.75 11.25 4.00 10.75 8.50 0.25 0.25 0.25 0.25 18.75 17.50 1.00 100.00 99 25 4O.75 Weight (Lbs. ) 106.19 67.33 18.25 5.97 84.90 35.76 22,38 80.06 0.12 0.62 0.31 0.09 21.83 53.09 0.79 ho7 69 372.49 125.20 Percent of Total Weight 21.33 13.53 3.67 1.20 17.05 7-19 4.50 16.08 0.03 0.12 0.06 0.02 4. 39 10.67 0.16 100.00 7h.85 25.15 --- Page 15 --- Fi Species gure 8. Lengths, Lepisosteus spatula Lepisosteus productus Lepisosteus osseus Dorosoma c Ictiobus b epedianum ubalus Cyprinus carpio Ictalurus Ictalurus Ictalurus punctatus furcatus melas Micropterus salmoides Chaenobryttus gulosus Lepomis macrochirus Pomoxis annularis Aplodinotus grunniens Cichlasoma cyanoguttatum * Length millimeter - Indicate s only one fish 13. Weights and "K" Factors of Fish Caught in Lake Corpus Christi, October and November, 1958. Standard Length*® Min. Max. Avg. 7h 320 Wd 135 185 290 110 150 LOL 170 90 955 625 560 270 426 375 380 215 130 215 14h 102 ahs 345 160 613.20 419.71 504.21 188.57 266.84 310.81 219.58 359-05 130.00 215.00 144,00 102.00 152.01 217.10 106.25 Weight in Grams Min. Max. 851 6,449 190 1,956 380 794 30 395 2ho 2,778 751 1,814 15 1,049 50 3,260 “ op) - 280 = iho ~ Xe) 38 =—-510 95 1,304 30 259 Avg. 241.05 578.23 991.92 146,84 856.53 1,014.56 236.27 92h. .00 55.00 280.00 140.00 40.00 132.11 348.01 90.00 myn Min. 0.68 0.53 0.32 1.54 3.31 2.98 1.30 1.36 2.02 1.96 4.79 Factors Max. Ave. 1.05 0.87 0.94 0.67 0.63 0.46 2.20 1.95 4.90 4.05 3.60 3.25 1.97 1.65 1.89 1.64 2.50 2.50 2.82 2.82 4.69 4.69 3-77 3-77 3.73 3.13 4oAL 3.01 6.22 5.35 --- Page 16 --- Feet Above Mean Sea Level. July ee eee - : N i i if - E : E Figure 9. 14. Leke Corpus Christi Water July, 1958 through June — Dec, 818 28 717 27 Jan, Te aaa vels b, March 1959 --- Page 17 --- 15. Figure 10. Lake Corpus Christi. LEGEND Numbers indicate turbidity stations Letters indicate weter analysis sta. TRACED AND ADAPTED PROM AERIAL PHOTOS OF THE U, &, PRODUCTION MARKETINO ADMINISTRATION --- Page 18 --- Hy Go? Figure ll. Station No. OO MOAANAWU EF ErWWNNHH 16. Secchi Disk Reading in Inches on Lake Corpus Christi. Date 7/16/58 3/23/59 7/16/58 3/23/59 7/16/58 3/23/59 7/16/58 3/23/59 7/16/58 3/23/59 7/16/58 3/23/59 7/16/58 3/23/59 7/16/58 3/23/59 7/16/58 3/23/59 7/16/58 3/23/59 7/16/58 3/23/59 7/16/58 3/23/59 7/16/58 7/16/58 7/16/58 7/16/58 7/16/58 Lake Level (msl) 88.21 87.67 88.21 87.67 88.21 87.67 88.21 87.67 88.21 87.67 88.21 87.67 88.21 87.67 88.21 87.67 88.21 87.67 88.21 87.67 88.21 87.67 88.21 87.67 88.21 88.21 88,21 88.21 88.21 Secchi Disk Reading 19 ee 1g 2g 224 30 22 28 ek 27 32 25 3h 20 28 25 eS 24 305 28 --- Page 19 --- Station No. - Indicates no reading. Figure 1 Date 10/21/58 10/21/58 10/21/58 10/22/58 10/22/58 10/27/58 10/27/58 10/27/58 10/27/58 10/27/58 10/27/58 10/27/58 11/24/58 11/24/58 11/24/58 11/24/58 2. Depth in Feet 10 20 LO 10 15 LO 20 30 LO 20 30 Lake Corpus Christi Water Analysis Results. OF 15 15 76 74 73 70 69 68 66 LT « Oo ppm 8.4 6.8 6.2 Tod 8.8 8.4 8.2 8.2 10.4 10.0 10.0 10.0 10.0 500 6.0 6.4 Ph-th Alk. M.O. Alk. 156 170 170 168 216 20h 196 198 pH ON ° ° ° oO XN XO © HD w Wl --- Page 20 --- Figure 13. Species Lepisosteus spatula Lepisosteus productus Lepisosteus osseus Dorosoma cepedianum Ictiobus bubalus Cyprinus carpio *Ictalurus furcatus Aplodinotus grunniens Totals Total rough fish Percent rough fish *Total game fish *Percent game fish 18. Netting Results, Bentsen State Park Lake, April 1959. Number Percent of Total Number 80.00 5 7.14 5 7 8 \ 5.71 12 17.14 26 37.14 1 1.44 14 20.00 3 4.29 70 100.00 56 1h 20.00 Weight (Lbs. ) 27.66 4.31 7-73 D037 46.62 1.56 14.82 2.69 110.76 95 94 14.82 Percent of Total Weight 2h .98 3.89 6.98 485 42.08 1.41 13.38 2,43 100.00 86.62 13.38 --- Page 21 --- Figure 14. Species Lepisosteus spatula Lepisosteus productus Lepisosteus osseus Dorosoma cepedianum Ictiobus bubalus Cyprinus carpio Ictalurus furcatus Aplodinotus grunniens Lengths, Weights and "K" Factors of Fish Caught in Lake Bentsen State Park, April 1959. Standard Length*® Min. Max. 525 745 360 Ahh 4h5 631 140 360 198 350 = 295 L75 500 230 255 - Indicates only one fish caught. * Lengths are given in millimeters. Avg. 629 .00 395 .80 565.00 212.00 274.23 295.00 274.57 245.66 Weight in Grams Min. 1,162 219 LUT 62 280 80 345 Max. 4,026 539 1,162 360 1,616 709 2,608 488 Avg. 2,511.80 391.40 877.25 203.08 806.26 709.00 480.42 407.66 NK Min. 0.80 0.60 0.46 1.52 3.04 1.03 2. kl Factor Max. L.13 0.65 0.51 2.39 4.00 2.76 2.09 2.94 Avg. 0.92 0.62 0.47 1.96 3.51 2.76 1.53 2.74 --- Page 22 --- pe Figure 15. Seining Collections on Bentsen State Park Lake, April 1959. Species Sta. Sta. Total Percent Rank 1 2 by No. by No. Dorosoma petenense 9 7 16 3.72 Ty Astyanax fasciatus ) 2 2 O.47 6 Hybopsis aestivalis 0 1 1 0.23 7 Notropis braytoni 23 9) 23 5235 3 Notropis lutrensis 2 9) 2 O.47 6 Cyprinodon variegatus 4 (@) 4 0.93 5 Gambusia affinis 121 212 333 77.44 1 Mollienisia latipinna 1 6] 1 0.23 7 Menidia beryllina 26 22 48 1.16 2 Total 186 ehh 4.30 100.00 --- Page 23 --- el. Figure 16. Netting Results, Campacuas Lake, June 1959. Species Number Percent of Weight Percent of Total Number (Lbs. ) Total Weight Lepisosteus spatula 2 8.33 195.82 92.68 Lepisosteus productus 1 4.17 4.18 1.98 Dorosoma cepedianum 2 8.33 0.15 0.07 Cyprinus carpio 10 41.67 9.50 4.50 Ictalurus melas 1 4.17 0.22 0.10 Chaenobryttus gulosus 4 16.67 0.75 0.36 Lepomis macrochirus 1 4.17 0.07 0.03 Cichlasoma cyanoguttatum 3 12.49 0.59 0.28 Totals 2h 100.00 211.28 100.00 --- Page 24 --- Figure 17. Species Lepisosteus spatula Lepisosteus productus Dorosoma cepedianum Cyprinus carpio Cichlasoma cyanoguttatum Gobiosoma bosci Totals Netting Results, Llano Grande Lake, June 1959. Number ah al 12 69 Percent of Total Number 34.78 7.25 30.43 17.39 8.70 1.45 100.00 Weight (Lbs...) 221.07 10.18 8.18 15.32 0.56 0.17 255.48 Percent of Total Weight 86.52 3099 3.20 6.00 0.22 0.07 100.00 --- Page 25 --- 23. Figure 18. Success of Check Netting in Campacuas Lake in Terms of Numbers and Pounds of Fish Caught, June 1959. Stations No. of Number Number Average Average No. Pounds Average Average Nets of Feet of Fish No. of of Fish Per of Fish Pounds of Pounds of Set of Net Caught Fish Per Foot Caught Fish/Net Fish Per Set Net of Net Foot of Net 1 1 125 2 2 016 0.65 0.65 2005 2 1 125 1 1 -008 0.21 0.21 2002 3 1 125 h 4 2032 5.43 5.43 2043 4 1 125 4 h 032 196.51 196.51 1.572 5 1 125 he 4 032 1.42 1.42 eOLlL 6 1 125 5 5 2 O40 5.19 5.19 Oke 7 1 125 2 2 -016 1.82 1.82 015 8 1 125 0 O « OOO 0.00 0.00 2000 9 1 125 2 2 .016 0.24 0.24 -002 Totals 9 1,125 2h = mone 211.47 --- --- Averages 1 125 ~= 2.67 2021 =ee 23.50 . 188 Success of Check Netting in Llano Grande Lake in Terms of Numbers and Pounds of Fish Caught, June 1959. 1 1 125 8 8 . 064 25.94 25 .9h .208 2 1] 125 5 5 2 OO 3k. 73 34.73 -278 3 1 125 5 5 O40 16.54 16.54 -132 4 1 125 2 2 -016 10.62 10.62 085 5 1 125 8 8 064 35.25 35.25 282 6 1 125 8 8 064 61.98 61.98 2496 7 1 125 7 7 056 38.70 38.70 «310 8 1 125 18 18 wldey 6.49 6.49 2052 fe) 1 125 4 4 .032 17.13 17.13 .137 10 1 125 4 4 2032 8.16 8.16 .065 Totals 10 1,250 69 -- ween 255.54 --- -- Averages 1 125 ~- 6.90 .055 === 25.55 2m --- Page 26 --- 2h. of Numbers and Pounds of Fish Caught. Figure 19. Lake and Date Number Number of of Feet Nets of Nets Set Set Falcon Lake 2 250 August 1958 Falcon Lake 12 1,500 March 1959 Lake Corpus Christi 15 1,875 October and November 1958 Bentsen State Park Lake 3 375 April 1959 Llano Grande Lake 10 1,256 June 1959 Campacuas Lake 9 1,125 June 1959 Number of Fish Caught 22 4.85 hoo 70 69 a4 Average Number of Fish Per Net 27.50 ho.4e 26.67 23-33 6.90 2.67 Average Number of Fish Per Foot of Net 0.220 0.323 0.213 0.186 0.055 0.021 Success of Gill Netting on All Lakes in Terms Pounds of Fish Caught 171.56 458.11 498.13 110.85 255.54 211.47 Average Pounds of Fish Per Net 85.78 38.17 33.21 36.95 25-99 23.50 0.145 0.254 0.266 0.295 0.204 0.188 Average Pounds of Fish Per Foot of Net Bs