TPWD 1959 F-4-R-6 #487: Inventory of Species in Possum Kingdom Lake: Job Completion Report, Project F-4-R-6

Job Completion Report State of TEXAS Project No: F-hwa6 Name: Fisheries Investi ations and Surve s of the Waters of Region HwB. deb No: B-zh Title: Inventor! of Species in Possum Kingdom Lake: Period Covered: November 12 1958 +_October 31: 1959 Abstract: Following an attempt to selectively control gizzard shed in Possum Kingdom Lake through the use of rotenone, a series of monthly net sets were made to determine the effectiveness of the shad control work: On the basis of these netting collections it was concluded that the shed population had been only partially reduced and that it had rapidly recovered from the effects of the chemical treatment: This recovery was due in part to a spawn of this species which occurred in Octdber 1958, two months after the chemical had been applied: Because the rotenone application had failed to dream tically reduce the numbers of gizzard shad, it was not necessary or possible to learn the time required by the surviving shad to rewestablish a large population. Objectives: To determine the effectiveness of the selective hill of shed and the time required for re-establishment of the shad populationo Procedure: Following the selective hill of shed on August 6, 1958, a series of net checks “were made to determine the extent of the kill: These nets were set in all parts of the lake: The data collected was to be used in evaluating the effectiveness of the chemical treatment: Monthly net checks were continued throughout the segment and the netting stations established dhring the previous segment were read in order that comparative data might be Obtained: Data concerning length, weight, sexy and stage of sexual development were taken for each fish caught in the gill nets: Stomach analyses of food remains in the netted specimens were made to determine the food habits of the various species collected: Seining stations, used during preceeding segments, were rendered useless by changes in the water level: This, combined with submerged tree stumps and brush in shallow water, caused the abandonment of seine collections because comparative data could not be obtainedo Results: The results of net checks made two weeks before the selective kill and again two weeks after the selective kill were included in the report for deb l6a~10, Project FalkeDmBO These indicated little difference in the relative abundance of gizsard shad before and after the attempt to selectively control them: Netting collections obtained between December 1958 and October 1959 indicated that the gizsard shad continues to be the most numerous species in the catch: This species provided h7:85 percent of the total catch of the gill nets (Table 1)n dizzard shad taken were of such size as to allow this species to account for 280h9 percent of the total weight of all fish takeno This was exceeded only by the longnose gar with 33:85 percent (Table 2), During the period from December 1958 through OctOber 1959 a total of 1,12h giszard shad, weighing 559th3 pounds were taken in the netting collections: These averaged 230 millimeters in total length and 2&3 grams in weight: Their length ranged from 150 to 330 millimeters and their weight varied from 70 to 510 gramso On the average 11.02 shad, weighing 5:8h pounds, were taken per 100 feet of gill not, set overnight (Table 3), A comparison of the data obtained during the 1955e1956 survey with that from the present segment shows that the gizzard shad population was somewhat reduced, probably by the selective kill attempted in August of 1958: Shad made up 78:91 percent of the total number and 61:97 of the weight in the 1955m1956 net catch (Table h). The 1958w 1959 net catch was also dominated by gizaard shad but not to such a great extent as previously Observed} Only #7085 percent of the total number and 28:49 percent of the total weight were shad {Tables 1 & 2}: The rate of catch of shad per 100 feet of gill net also indicates that the shed population was reduced by the chemical treatment in 1958: Each 100 feet of not set in i955ml956 took 18081 shad, compared with the 11002 shad per 100 feet of not set in the 1958e1959 netting collections {Tables 3 & h): Game fish showed an increase in the percentage of the fish taken in nets, both in numbers and in weight: They comprised 15:80 percent of the total number and 15:56 percent of the weight in the 1955m56 figures and they increased to 3htfi8 percent of the number and 2&095 percent of the weight in the 1958w59 netting figures: A comparison of the catch of game fish per 100 feet of gill net shows that 3066 were taken in l955e56, while 7:9h were caught during 1958m590 The pounds of game fish caught per 100 feet of net since the attempted selective hill is also higher with 2:32 pounds in l955m56 and 5:02 pounds in 195Bm59o The "K" factors of the fish taken during the two periods show little difference {Table t}: Conclusions: The results of gill netting before and after the application of rotenone to Possum Kingdom Lake, during August of 1958, indicate that the attempted selective hill of shad was only partially successful: There w°s a definite reduction of the shed population but a successful spawn of the surviving, large shad during October 1958 replaced many of the shed which had been killed: The decrease in average weight of shad caught after the rotenone treatment may be due in part to the fact that many of these were youngmofetheeyear shad which had been spawned in October 1958, Following the chemical treatment of Possum Kingdom Lake, fishing success improved but was of short duration: dame fish, however, showed a definite increase in the perm centages of both numbers and weights of fish taken in nets, it appears evident that the selective kill of shad had a desirable effect on the fish population of Possum Kingdom Lake, The overall value of the treatment, un~ fortunately, was reduced by the fact that the shed were not destroyed in sufficient numbers to prevent their continued doninance of the fish populationo Because giszard shad remained well established throughout the attempt to selec~ tively control them, there could he no determination of the time required for the shed population to remestablish itself, The need for selectiwe control of shad in Possum Kingdom Lake is still present and further experimental work is needed to determine an effective means of reducing this population, l I “2% Prepared by‘ Leonard D“ Lamb .. h, dhsrowed by czebteetqhx ns/ ,/ P3936ct leader Director Inland Fisheries Division Date Jenner: El, l960 lb Mi ' mans-am-“- m edem H, mesons moo monomodmmo ow mono mwmowmm ameo ow mHHH mode woos wommos mwomoos beam wmddmmo Umoesvme mem and Goddamn Hmmmo sesame Som swam : so m m we : Rondo umooEGmH Wdedew Boson bwawH mow mono mwmowmm 200 financed 20. wmwomnd 20g monomos moo manhood 20a Madonna Zoe wannabe mmonamm med m oomH r o.mH m memo HOUMDOmm mow H moww H oowH Hm HHowm How mwgor r mowm newsman ammo ma mmuom Hwo mmewp pom mmomw me away: mom smamo mm mo.4s mseooaosaa_aaaamoo m roam m oewo m moms enema seaemsswma w meow H: mama m4 moomm m more HP H040 so omen: meow H oowH m Hora nemesma awesome w moon w womm H cums on Hams m were asses swam 4 ngmm mm magma so mmo m w mass a snow m meme emamsaQsae.emmm H meow ow mfimm we snow m easy 0 ooow w also moodsmm doom fleasooaw menses moomwmw w oomH HH Hooww mw memo spammoee_asssoms w Homm Ho race m were mm seems we meow MmHHosomHHw mobmwmb H moww Hoommms msoflwmo . H Oon asses seasons 4 meow a meow w some Ho some m were meoW osmowwm . m o.mH sass m oowo H claw season so Hooooo mom wooooo mom Hooooo Hem Heoooo men Hooooo me Rococo edem Ho zoSUmn Hoo. Edam 205d? momonm wooedmo mow HemmDOmm mow memmwm mwmm mamHHaoodw.donmHo wH<mw omwwmoowmw omen owoBUmH omdemw anam comm Hmwmmeoodw dmmm moonama dmmm zoosooaw modems moomHmU wHommHHH moomHmw MmHHoaGmHH% monHmw boommmn mmomwmw :deo osmoon meow owmowwo vans HoamHm ”noodwoommv Zoawme mom meomosmmm om meow momowmm amwmo ow mHHH Zoom wOmmoe mHoons Hme wedsomo mmnmsdmw mem mom Condoms memo 20. wmwomod Hom Hoo.oo w bsmomd 20. mmHQmod Hr,mm mH.Hr 4.HH 4.H: i—‘i-WJUIU H doHr H 40H; m Hsamm w MH.r: H: HO0.00 to mmoemswmfl Zoo newness m o.mm Hm m.wo mom Hm.mw m 00mm Hm m,wm . m o.Ho mm Hw,oq H4 w.wa Hr mass m o.Ho w 00mm mm room 4m onmm m 00:0 mow Hooooo Ho Gadodmn 20. Wmsomnd m o.mm Hm m.mo me mm.mH H o.rw H 0.:w Hm mesa m4 HH.mH m comm 4 w.om wH Hwawm H oorw mom Hooooo woos 20. mo mmm HthH MH Hut Hmm mtwrm Hom HoamHm monomod o.mm o.4m rn.mm o.mm muse o.mm worm Ho.0m m.mH 0.0m oon momm 4.Hm ego: 0.0: m.or 0.0m o,mm HO0.00 zmHmwd moo wmwoooammm ow meow mwmowmm amwmo_cw.mHHH_zoflm wade wommoe mHommoe Howe macs wmomade wam I Oododmfi Hmmw. Hdem m. aosdmfi Hoo. zeam r HH m m Boner doomadmw wmcwsmflw zmuow waHH momoHom monomm madness wosbmm wannabe woobmm wmuomnd monomm madness mdefimm.mmH F.4m m.H: boomsomm mma w.oo m.om H.wH o.mm mw.mo m4.44 oHusmam.msma. HH.qo ww.mm 4m.ww m4.Hm 4m.mo om.m4 mm.mo mw.ww mamHHaosas.deameo HH.mo wH.oo wHama amass:QWma m.oo m.wo Ho.mm 4.mm 4w.om wm.m: m.mo m.wo omwo w.r: H.mm osmnsmH.omaanw H.4o :.mm w.wm m.mw 0.40 o.wH esHam ummm w.Ho w.H4 mm.4m maemw Hm.mH mH.mm :.mo :.HH Hmammsosae.dmmm o.mo H.mm m.Hm m.m4 HH.Hm m.ow w.mo w.mo moosamm.¢mmm o.rw o.wH amasosdw.dmmm wmmmmfl mobwwmw o.mo o.mm w.Ho m.mw stmmH H mssaHms o.mw o.H4 m.4: H.m: m.Ho H.mm MmHHoavaHw mooHHmw o.mo o.mr Hoommmw moomew stam nameeHm m.:: H.4m m.mm H.Hm H.oo o.mm mHmow oamseHm o.mm o.mm cams aoamHm w4.Ho Hoo.oo me.mo Hoo.oo mmH.mo Hoo.oo Hom.ro Hoo.oo zmwmwe mom wewomsemmm 0% mean momowmm RHoons bmwm woos wooeedmw Homm adem m. AoooeHoommv zosdme H00. Zmdm Ho Zoos? me momowmm manage wmeomod moonamm.mmw w.mr H.m© Hoomoomm mow www.mm mr.mw ooasman.msma Hmo.mm mm.mm memHHeoodo.dowmeo m.mm H.mo demH omHomoQWmH HH.om H.44 Geno owmnomH omdwwmw mo. 00 w.MH :oHam ammm w mm o.mq boomesocdw_ommm Q. OH H.Hw wooedmo.dmmm Emwsoodw wmamma mssaHms Hr.os m.mm wHommHHH moomwmw m:.wm w.wH MmHHosdeH% msowwmw Hoommmw moowwmw o.wm 0.0m szdm nemoowm w.r4 o.mm meoW oomome sass H.om o.Ha eoamHm www.mm Hoo.oo woooam PS 9% one om.mH MH.m4 r.Hm fimm m.wm 0.4H m.mw : mono wmeomod m.mm m.mm m4.m: mm.H: Hm.mm w.Hm m.om H.4w o.mm m.om o.mH 0.:m HO0.00 m moHM monomm wannabe w.Hw w.mm Ho.m4 Hw.mm mm.mH wm.mm o.mn H.mH wo.mm Wm Hm w.mm H.0m H.m: H.ma H.mH H.mm mo.HH Hoo.oo emeo ow QHHH Zoom woos memmos Condoms mema w homomd wooon wmwomod m. mo m4.40 H. rm m 44 0. mo w. mm m.Hm H:. mm o.wm m.Ho o.mm H.m: o.rq w.om H.MH «.m: Hm.Mm Hoo.oo edem mo assess Hoow Ewen Renew mwmowmm moosemm mew boomSOmm mow QHNNmHm moon msoHHaoodw dfiHHmHo wH<mH omwomsowme Geno QfimobmH omamwmw 26Hem doom Hmnmmsosdw dome weedaem.dmmm Smwsoosm dmmm weaned moomHmo mHommHHH.mcoHHmU KmHHonmeHw moomeU Hoomome moomHmfi szeo osmowwm meoW owmwwwm UHGS HedeHm Howe woos wmomsdme mem s Oodoome Hmmw. so mendmsdms monomm newness Hm.mo w.HH mow.m4 w4.44 HOH.:m Hm.mm m.m4 0.0m Hm.om m.mm H.0H o.Hm me.rm mm.mo Ho.H: H.mm Hm.Hw m.mm H.Hm o.mm o.mm o.H4 :.mm 0.4w mw.mo :.wm w.mH o.mo www.mH Hoo.oo Ho Condoms Wesson wmenmod m.4: H.Ho no.Hm mm.m4 m:.4m m4.mo m.Hm w.Hm m.om H.om m4.mm H:.HH Hm.em m.H4 m.om H.0m H.mm o.mH Hm.HH m.mo o.w4 o,Hm me.mo Hoo.oo Hom aoemHm monomm madness Hm.mr m.H4 non.ms ww.mm mmm.pw mm.:m oo.mH w.ww Hrr.om m.wo m.m4 0.:H mom.Hw HH.Ho Hmr.H: m.mm :m.mm m.mH H.mm 0.0m o.mm o.or Ha.om o.mm we.qm H.mo o.mo 0.0H o.wm 0.0m rm.4w m.ww o.mm o.ow m.Hm o.mm mcomo.m4 Hoo.oo nooodwnoemv ZmHmwa mom wmeomodmmm 0% men: momoHem Hmeo ow mHHH Zoom woos wommsa mHomooa A— emon w. momowmm moooamm mow HOBmBOmm mow QHNNmHo moon msmHHaosfiw dowmeo wH<mH omeomoonH omwo osmoooH.omameU szam doom Hmwmmsoofiw demo moooomm ommm Smwsooaw_dmmm wmoomw moowwmw stmmHHH moomHmU meHoadoHHw moomHmU Hoommmfl moowwmw szdm onoon meow onmonm bass GOHmHm wommos Nwommoe Howe ZodeHom Umam» Umnmeomw mem : Oedoome mem. eOHmH wooden mo moo HcHMH Hmw & ow HoemH _ 0. mm o 4m H4.mm 0 mm m 4o o.mm m.Ho Ho.om m.mH o.oo o.Hw m.mm a. Hm 0. 0H o. oH m 0H o. oo o.mm HO0.00 BoomH Hoot zmHmfio Hm. mH eon m4 mom.Hw ao.oH HHH. oo o m4 mom. Ho H»H.HH Hm.mm H.mm o.mm Ho.mm woaqm o.mo o.wm Ho. no o mm m.Hm m.ooo.mn Sewmwd m .HN bdmemmm Hmdmaw mHm moo moo wow mow mom wmo mHo mom MHo Hmo Hmm HwH Hwo Hmo qu mmm bdowmmm zmwmwd Qwosm Hcomo.m choo.w me.o m ooo H How a 444 m oHa H mom w wmm.o mqo.o Hwo.o HmH.o HHH. w mm o How. 0 HHo.H Hmm.o wm4.o mooonm amem w. mooaomm mow HoomDOmm mmH mwmmmwo momm memHHaoc&u_donmHo deoH.omHomoQWme omwo owmoomH omamwmw fibwam dmmm Hewmmsoodw doom moonsmm.dmmm Smwsoodw dmmm moaned msomwmw wHommHHH_moomHmw MmHHoedeHw moomHmU Hoomnme moomHow sowed osmoon meow nemoowm woos Hedem EonUH wmomm memsm HmHsHmam HHo-mmmw qosmHo mwolHHmo Hoo-HHHm moouHmmo HHm-mmom so-mm4 oo-HmHo moo-mmo Hoo-HHm owuHmm om-me mm-mm Hmw-Hmw mOawmo HHounm Hmm-HmH4 H0. 20. wow Hoo we. om Zoe 0 O H OOI—JOOHOOOOMHOHOHNO aQOU‘lmeWM'OMI‘O cumoonmHoms-o c>c>oak>c>ox oxn3u3+4+axn . mw.om ham. won Hoo as. 0% Zoe 0 \DCDHHWNCDODHKO-F'rm . OOOOOHMOHOWC‘AO ILAJHOO-F'RDIDO-l-VQCDKD-F' O 4:- CO 0.0w mo.Hm Aoooewoommv wOmmos fiHomoos Howe ZodaHom boomu Umomaome mem a Condoms Hmmm. I I I I l l I L» O O O diu-F'F'UJN 00000 I I [0me Q 0 Oxinoo OOC'DOOO WNWNWW—F’WNWW FWCOOOOH O O o I HF‘kO‘OCDHwOGDKO-F'ngml-J I Om OOOOOOO NMHNWWHWHHHHNHNH OEDO (Din c>c> o I 3 m: bdmwmmm mmmmw-P‘ww deOO—QOO F'FWWCDONO