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Lethbridge Herald Newspaper Archives

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Lethbridge Herald, The (Newspaper) - May 2, 1973, Lethbridge, Alberta 38 THE LETHBRIDGE HERALD Wednesday, May 2, 1973 Another statement attempt- ii.U to establish that putting hatchery trout Alberta in unreasonable, lias bet-u put out In the fish and vildiile people of the Alberta eminent There is still n deal of rifjuinciH OUT this issiif, but tne following, from the u-sher- jo- biologies in Lothbridgc, be taekn into account angles often as' intcrferred v ith natural reproduction. This policy is based on the results of a numb.r of stud- ies on the effects of stocking font in Alberta streams and rli-cu here Ft imariab'} been that the use of En, or hrtcerhngs is of no significant 1 r.iv.e in improving the catch trout streams contairmg lid tiout The use of caich- a'-Me-iue trout isix. or more, viches in length1 has also gen- eralU not impiosed the sport dshing opportunities of a stream except in spscial cu- ou instances which vill bs inenuoned later.'1 The late Or Richard Mil- of the Lni', ersuy of Al- berta, found that tno-three A ear old hatchen. reared cut- throat trout, stocked on a res- ident population of the same i-Deciea, in Gorge Creek a tributary of the Sheco River) a general inability to Minr.e unless thrn v ere lars- than the natue trout Vuld t: out Ubed in the same man- ner showed a little bet- 'er reaction than tne hatchery However, if hatcnery- reared fish vere planted in a section of a trout stream fiom which the resident pop- ulation had been remo'. ed the degree of survival was gen- erally pood, probably because Competition from resident was lacking Dr Martin Paetz chief f.shery biologist, found that returns of rainbow trout year- lings planted in the Carbon- diie River in Southern Al- berta in 1939 and I960 were orvh l-l and 1-f per cent, res- pectively: he concluded that the recovery in neither case v as sufficiently large to jus- the stocking of catchabie trout in the Carbondale Rher unless fishing pressure in- c-eased considerably. Recov- ery of these rainbow trout the after stocking was low only 5.6 per cent of the num- ber of trout In another Alheita resigned to measure the ef- fect of stocking both finger- ling and yearling rainbow trout in a stream. B. Cuiv ringham (then working as a fishery biologist ou: of Cal- gary i found that the planting of about hatchery fish iii 1160 and V361 in Jumping Pound Creek, west of Calgary, had little effect on the ang- ler's catch. Only 3.2 cent of all fish caught were of hatchery origin. Only 2.8 pet- cent of the yearling trout planted in 1961 and 0.2 per rent of the hngerling rainbow trout planted in 1980 were ered by anglers "He connludcd that the low rate of return makes the cost of stocking programs, such as this, extremely high. The re- sults of a survey Cun- ningham conducted on the Jumping Pound in 1959 show- ed that even a relatively poor quality trout stream heavy fishing pressuie can maintain an adequate fish population the addi- tion of hatchen- fish. In an additional study concerning stocking yearling rainbow trout in the Jumping Pound in 1963 and Cunningham noted that hatchery fish com- prised 16.8 and 19.5 per cent of the catch in each >ear. respectively. These better rates of recovery were atlri- to the time of stocking. The best recoveries occurred when plants were made after mid-July when stream flows were .stable and angling pres- sure greatest. Other fishery biologists have also found thai slocked in this manner cenernlK ucldod the rccwrrv raict "Dennis McDonald, former- ly also the regional fishery al Calgary, recorded a per cent degree of re- of lagged catchablf- tioii' stocked m HI I'n T I -I- lilcnmore Reservoir in Cal- gary. Carry-over to the next of tl't- study was insigni- ficant. This high re- turn could be attributed to factoiv This sec'ion ot the Elbow River was sub- jected to extensive angling pressure because tlu fact large trout h id been stocked was well public- ized, the Elbow docs contain a large number of native trout which compete with the hale-hen- rearod catchablcs and the riv er flows through the heait of a citv with a population of over 030.000 people ''However, in a study on the effects of slocking catchabie trout (sev- c-i inches or longer) in wild trout streams in Montana, Vincent (a fishery bio- logist working for the Mon- tana Stale Fish and Game has found that I his pracltc? is a waslo of sportsmen's dollars and actu- ally provides fewer year- round fisliing opportunities for anglers. Vincent has con- cluded that, although Mon- tana's catchabie program does put more fish into the angler's creel, it does so bv decreasing the number of more desirable, w-ild trout in the stream and the creel, reducing both tha total pounds of trout taken and their aver- age size. "The reason for this pheno- menon seems to be that hat- chery fish, because of (heir sheer numbers, displace na- tive (rout from their territor- ies, thereby decreasing their chance for survival. Because hatchery fish do not usually !he long after release in streams (70 per cent die within four weeks, 95 per cent vithin 12 weeks) what eventu- ally results Is a net loss of catchabie fish. The wild trout population is reduced and the hatchery fish suffer high mor- tality resulting in less fishing potential on an annual basis. "The foregoing is a brief re- view of some of the experi- mental work on which our present stream management policy is based. There are, however, some exceptions made, under the circum- stances previously described, in which better fishing oppor- tunities can be created in cur streams through the use of hatchen- trout." Jupiter mission may fail BOSTON (AP) Two United States spacecraft are racing to- ward Jupiter and one of the chief scientists involved in the project says there's a "real pos- sibility" the mission will fail. Ur. James A. Van Allen, chairman of the physics and as- tronomy department at the Uni- versity of Iowa, said in an in- terview that the intense radi- ation bells believed to exist around Jupiter could knock out o1' disorient the spacecraft elec- trical systems so the signals could not be beamed back. "All of us are mentally pre- pared for the spacecraft to drop Van Allen said. "Tha judgment of the moment says the radiation won't disable tha spacecraft, but it's a real possi- bility." Van Allen's experiment con- ducted in 1958 by the first U.S. satellite, Explorer I, discovered the earth-circling radiation belts which are named after him. 2025 MAYOR MAGRATH DR. "COLLEGE MALL" 324 MAYOR MAGRATH DR. 420 STREET SOUTH "DOWNTOWN" Open .Daily 9 a.m.-6 p.m. Thursday and Friday 9 a.m.-9 p.m. Saturday 9 a.m.-6 p.m. RAINBOW FACIAL TISSUES 100s 2 Ply Pkgs. MIA-LING, WHOLE OR SLICED, 10 fl. 01. Tins YORK FROZEN CONCENTRATE fl. oz. tins SCOTT VIVA, ASSORTED COLOURS 2 Roll Pkgs. BLACK DIAMOND MUSHROOM, PIMENTO, SAMS OE, DANISH BLUE, ONION or CAMEMBERT 4 oz. Net Wt. Pkgs WITH CHEESE CATELLI, 7U oz Net Wt. Pkg. SNOWCAP FROZEN 2 Ib. Net Wt. Pkgs. POWDER FOR LAUNDRY, 5 Ib. Net Wt. (King Size) Pkg. APPLE-STRAWBERRY REGAL, 48 fl. oz. Tin BATHROOM TISSUE 69c PEPSODENT m. 99c COFFEE abobe 1.39 FSSH CHIPS Fra5Crvoltl Turbot (u'69c LIQUID DETERGENT 59c PEANUT BUTTER Jcck nnd Jiil RIFAfH Power P'UI 24 oz. net wl. jar RED, LUSCIOUS NEW CROP CALIFORNIA OR HALF ROASTING Of PORK CANADA NO. 2 GRADE GEM POTATO SUNKIST ORANGES RED GRAPEFRUIT Sweet and Juicy. Small Sue 1 1 O 1 doz Sweet and Juicy for WE RESERVE THE RIGHT TO IIMIT QUANTITIES TO NORMAL FAMILY PURCHASES WHOU, QUARTER ;