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

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society's policy. Tl.re scale of operations has since varied according'to needs, and lvas n-roclifiecl by transport difñculties in war years. Quantities shifted in different yeafs are variously clescribed as, "ranging from fingerlings to three and four-yearolcls," "yearlings ancl ttplvarcls," ancl "fish of 5 in. to l?in." O¡ the basis of clata given earlier, the survival value of these fish might be frour 1.00 to 200 times that of unled hatcliery fry. Thus, 67,810 salvagecl fish might represent the survival of from between 6,000,000 and 13,000,000 fry. Yet the fish saved were collectecl and transportecl for a flaction of the expenditure of-time ancl r-norley which woulcl be requirecl to procluce even 1,0@,000 hatchery fry. In Marlborough, where sporaclic salvage work had been undertaken earlier, almut 120,000 fingerlings, mostly of 3 in. to 4 in. in length, are reportecl to have been salvage cl in 1937. ldo trout hacl beer-r releasecl from hatcheries ir-r Marlborough f
!r'i11 not necessarily be the optimum for another stock under different conclitio¡s. Yet in designing regulations for a series of waters, several of which may be visitecl by an augler in one clay, it wilLl be probably always necessary to avoid the complexities of law enforcement which would arise from a multiplicity of local r-egulations and, i'stead, to legislate only for the most rlsrlal conditions. Durati,on of Season: The optimunl duration of the close season is not wholly a rnatter of what is best for the fish. There is little cloutrt that most anglers tire of their sport torvar
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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
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CHA}{GE I}f SIZE OF TROUT-SOUTH ISL
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fr) River Lure Period 1880-1890 189
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(¡ of sorle inadequacy of specific
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fallen in inverse proportion to the
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without a corresponding decrease 'o
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the Waipahi, increase in numbers bu
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\iVhile the number of anglers has i
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cent. in the smaller east and west
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Data from the special licensing are
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(Above) I)rought conditions at Quad
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PART II Recent Management of Fisher
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important sources of income in the
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v aim 'is solely one of transfer, i
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the same as the number of eggs stat
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û Exclusive of Taupo and Rotorua t
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handled where eggs are collected, a
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Í- stage.Subsequentlosses,aSgivenl
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L The reports of the Ballarat Fish
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J be seen, when abnormal losses are
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'] as -to losses in two lots of bro
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715,000 fish distributed. This numb
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which those estimates were based an
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CONSTRUCTION OF SPAWNING REDDS OF B
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A con-iparison of losses recorded i
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to time, abnormal flooding, occurri
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It .n,otrlcl appear fronr the facts
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'I'he fìoocl-trrcached rack in thc
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oclies has been devotecl to recorcl
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In 1935, which was a peak collectin
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of the examìnation ol 2,883 birds
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stations in the country in a year.
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fry of rainbow trout recorded as re
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Ë eggs. The "bag" of the other rvh
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(t seasons, have used stationary li
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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
Page 145 and 146: here. At present, it is justifiable
Page 147 and 148: t- of fish from streams. Under tr)r
Page 149 and 150: Setti;rg an cel baskct u'hcrc it is
Page 151 and 152: It will be observed from the forego
Page 153 and 154: d as the present v/fiter has on the
Page 155 and 156: Environment Improvement-Physical LI
Page 157 and 158: (3) \A/here the deficiency of cover
Page 159 and 160: esselltial. Because, r,vith excessi
Page 161 and 162: ,.) in rivers of considerable size
Page 163: ( 1) The relative al,seuce of angle
Page 167 and 168: fo¡gariro lìivcr-Iì¿unous rainL
Page 169 and 170: ¿> lin,it to llin. would result in
Page 171 and 172: egulations can have no general sign
Page 173 and 174: tìature of this iure nc¡r the rno
Page 175 and 176: è organization in the provision of
Page 177 and 178: larger ones. However, larger societ
Page 179 and 180: L G o 4 equitably to obtain a more
Page 181 and 182: ç o ç ,) of negative interpretati
Page 183 and 184: 0 õ o paid in licence fees, can le
Page 185 and 186: I ,} o ê REFERENCES Arrrl, K. R. (
Page 187 and 188: I Jl f Neeouau, Peur, R., & Slerr*.
Page 189 and 190: J I APPENDIX A The 1941 Census of t
Page 191 and 192: !L 't ,APPENDIX B Interference with
Page 193 and 194: fl tf -ì APPENDIX C Injuries to Tr
Page 195 and 196: APPENDIX D Claims of Success of Hat
Page 197 and 198: å t.: I -'l t ta ¡ ,} f (3) Cessa
Page 199 and 200: maxirnum'density. It is possible al
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N.Z. MARINE DEPARTMENT-FISHERIE,S BULLETIN No. .į

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