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

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Ito -il ,A f { I { tIô i N E W ZEALAND FISHERIES MARINE DEPARTMENT BULLETIN No. 9 TROT]T FISHERIES t\Ew IN ZEALAI\D Their Development and Management by DBRISLEY F. HOBBS . Senior Fishery Officer [fresh'water] Wellington New Zealand 1948 Fisheries bulletin (N.Z. Marine Dept.) no. 9 (1948) Marine Department
Page 1: .ç N.Z. MARINE DEPARTMENT-FISHERIE
Page 5 and 6: t ta t CONTENTS Part L-Historical I
Page 7 and 8: ? e CONTENTS-Continued' DNiInonuBNr
Page 9 and 10: Plate t, Text LIST OF' ÍLLUSTRATIO
Page 11 and 12: PART I Historical INTRODUCTION 1.ur
Page 13 and 14: (15)Hitherto,restrictionsonangling,
Page 15 and 16: the transference of fish and had to
Page 17 and 18: 187G80-Releases of brown trout were
Page 19 and 20: have been successfully introducecl
Page 21 and 22: poltv'ef, alx1 have clisclntgecl wa
Page 23 and 24: Reference to forest fires causing h
Page 25 and 26: shadowed urater, and that the penet
Page 27 and 28: occurred fairly generally, may be n
Page 29 and 30: ö drainage has led, it is said, to
Page 31 and 32: The existing laws, which are a strr
Page 33 and 34: years ago" from the Lee. In 1883 he
Page 35 and 36: Orcti Ri 11 (St|. Is.) bct¡-een Di
Page 37 and 38: eaches of the Oreti the fish were o
Page 39 and 40: iÀr River !Vaipa.hi ....'. tt Slia
Page 41 and 42: 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 and 94:
It .n,otrlcl appear fronr the facts
Page 95 and 96:
'I'he fìoocl-trrcached rack in thc
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
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 and 164:
( 1) The relative al,seuce of angle
Page 165 and 166:
!r'i11 not necessarily be the optim
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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