N.Z. MARINE DEPARTMENT-FISHERIE,S BULLETIN No. .į

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that a year aftet fingerlings of about three inches had been released in a streanr only possibly as many as 6.3 per cent. were alive, whereas24.r per ce't. of 'ativeborn fingerlings of the same ãge survivecJ. on the question of relative growth of hatchery fisl-r and wild fish, Neeclham ancl Slater (1943) fou.cl that the growth of the latier ln nn.quuiperiocl i' the same water u¡as, in length, about twice that of fish r-eleased at ï length of 3.7 inches. The comparison is not au ideal one, as the hatchery fish were rai*bolv arcl rnost of the r'vilcl-fish were l¡rown trout, álthough the growth of two wil¿ rair-rbor,r, *.as llì,,iï:rlo with that of 'the w'cr b'ow, trout rather than that of trre rratchery to thrive a.ci to ,..r,r, nuroil.lince suggest that the survival of rvil
'I'he fìoocl-trrcached rack in thc Upukerora River-a Lakc Tc Anau (Southlancl, Sth. Is ) trihutan' u'hcre '\tlautic sal- :rorr. l,rou n tloul atlrl rairrlrorv trout ( ìn that seclucucc) spa\\'n Thc fìoocling rvas a rli:aplìoirttlttettt to tltr' ( !19 collectors but possibly a bcnefit to local stocks, as, itìciclentally to tire collection of a nrilliorr or two eggs, thtlìr-oduccr: of scvt t'al tiltlr. that quantity \\-crc usrtalll confìnecl l¡r' thc rack tc¡ a lestricte
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.ç N.Z. MARINE DEPARTMENT-FISHERIE
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Ito -il ,A f { I { tIô i N E W ZEA
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t ta t CONTENTS Part L-Historical I
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? e CONTENTS-Continued' DNiInonuBNr
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Plate t, Text LIST OF' ÍLLUSTRATIO
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PART I Historical INTRODUCTION 1.ur
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(15)Hitherto,restrictionsonangling,
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the transference of fish and had to
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187G80-Releases of brown trout were
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have been successfully introducecl
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poltv'ef, alx1 have clisclntgecl wa
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Reference to forest fires causing h
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shadowed urater, and that the penet
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occurred fairly generally, may be n
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ö drainage has led, it is said, to
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The existing laws, which are a strr
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years ago" from the Lee. In 1883 he
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Orcti Ri 11 (St|. Is.) bct¡-een Di
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eaches of the Oreti the fish were o
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iÀr River !Vaipa.hi ....'. tt Slia
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N) \o River Lure Period 1880-18m' 1
Page 43 and 44: CHA}{GE I}f SIZE OF TROUT-SOUTH ISL
Page 45 and 46: fr) River Lure Period 1880-1890 189
Page 47 and 48: (¡ of sorle inadequacy of specific
Page 49 and 50: fallen in inverse proportion to the
Page 51 and 52: without a corresponding decrease 'o
Page 53 and 54: the Waipahi, increase in numbers bu
Page 55 and 56: \iVhile the number of anglers has i
Page 57 and 58: cent. in the smaller east and west
Page 59 and 60: Data from the special licensing are
Page 61 and 62: (Above) I)rought conditions at Quad
Page 63 and 64: PART II Recent Management of Fisher
Page 65 and 66: important sources of income in the
Page 67 and 68: v aim 'is solely one of transfer, i
Page 69 and 70: the same as the number of eggs stat
Page 71 and 72: û Exclusive of Taupo and Rotorua t
Page 73 and 74: handled where eggs are collected, a
Page 75 and 76: Í- stage.Subsequentlosses,aSgivenl
Page 77 and 78: L The reports of the Ballarat Fish
Page 79 and 80: J be seen, when abnormal losses are
Page 81 and 82: '] as -to losses in two lots of bro
Page 83 and 84: 715,000 fish distributed. This numb
Page 85 and 86: which those estimates were based an
Page 87 and 88: CONSTRUCTION OF SPAWNING REDDS OF B
Page 89 and 90: A con-iparison of losses recorded i
Page 91 and 92: to time, abnormal flooding, occurri
Page 93: It .n,otrlcl appear fronr the facts
Page 97 and 98: oclies has been devotecl to recorcl
Page 99 and 100: In 1935, which was a peak collectin
Page 101 and 102: of the examìnation ol 2,883 birds
Page 103 and 104: stations in the country in a year.
Page 105 and 106: fry of rainbow trout recorded as re
Page 107 and 108: Ë eggs. The "bag" of the other rvh
Page 109 and 110: (t seasons, have used stationary li
Page 111 and 112: t PART III Recent Investigational W
Page 113 and 114: LAKE ALEXANDRINA_SOUTH CANTERBURY O
Page 115 and 116: TABI-E XIX Duration of Species Size
Page 117 and 118: ti 't becoming available. The short
Page 119 and 120: - is nothing to srlggest that any s
Page 121 and 122: S-inch fingerlings can be pr:oducec
Page 123 and 124: -ì has shown that the estimated to
Page 125 and 126: ,t Its contributiori to the èatch
Page 127 and 128: Discussion The various overseas stu
Page 129 and 130: there are fundamental biological re
Page 131 and 132: lnanagement to leave well alone anc
Page 133 and 134: f of the lakes, where, in the absen
Page 135 and 136: RIVER POLLUTION-Thc photographs ill
Page 137 and 138: If man is to improve the fertility
Page 139 and 140: excess, but to the quantity of t.he
Page 141 and 142: with incligenons forms only where t
Page 143 and 144: -È-' e tial increase of trout. Con
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here. At present, it is justifiable
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t- of fish from streams. Under tr)r
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Setti;rg an cel baskct u'hcrc it is
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It will be observed from the forego
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d as the present v/fiter has on the
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Environment Improvement-Physical LI
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(3) \A/here the deficiency of cover
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esselltial. Because, r,vith excessi
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,.) in rivers of considerable size
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( 1) The relative al,seuce of angle
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!r'i11 not necessarily be the optim
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fo¡gariro lìivcr-Iì¿unous rainL
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¿> lin,it to llin. would result in
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egulations can have no general sign
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tìature of this iure nc¡r the rno
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è organization in the provision of
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larger ones. However, larger societ
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L G o 4 equitably to obtain a more
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ç o ç ,) of negative interpretati
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0 õ o paid in licence fees, can le
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I ,} o ê REFERENCES Arrrl, K. R. (
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I Jl f Neeouau, Peur, R., & Slerr*.
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J I APPENDIX A The 1941 Census of t
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!L 't ,APPENDIX B Interference with
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fl tf -ì APPENDIX C Injuries to Tr
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APPENDIX D Claims of Success of Hat
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å t.: I -'l t ta ¡ ,} f (3) Cessa
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maxirnum'density. It is possible al
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N.Z. MARINE DEPARTMENT-FISHERIE,S BULLETIN No. .į

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