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

O TABLE XIT
Pre-eyed Ova of Brown Percentage
Trout-Loss.
otago, er annum.
/32
*tl|î*:
P::ffti;á ,.. -- --: -- Í3 ig::lll:
North Canterbury, /34 ._". _-.. -ã.ä å., ..n,.
N:::,1 t:::e\b$y, '/3s. _- - - íö f", ..,,,
District Mean for
mean. species.
8.3
20.3
6.9 per cent.)
Otago, /35
12.7 il' ;;i.t e.8
\-/LdBU, /JJ 72.7 per cent.
South
-à.7
ruLrLrr Canterbvy, L,anrerDlJry, /34x /ó+4 ...... 6.7 per l-,", cent.] ..n, cent.
South Canterbury,'¡35* 9.9
ó.9 6.9 per cent. I
Sotrtl, Canterbwy','136* ...... 10.7 per 10.1
cent.
Soutlr Canterbury,'/32*
i
I6.3 per cent.j
)./
7.9
10.5
figures ro, ro55s5 of brown i-ri L'õ:;"';;t:" to eggs vbsr tarre, L.!¡\Lrt rt rr.or¡ urrt
fr91 the Tio _ttîtu ]rcl
Leith stream. I' 193g they incrucre also rosses at r.ake
Lil,..':.,t',!.:,:jl?] g?*" where i' *.*r-r.*,-';i..r"" -¡l ;;ï. .rs ö;..ï;:
ùtrlJlrrrCS WcLs
8.3 per cent. wourcl
:::ï:*; ::^0.1-lt{
u"ro* the average fc¡r VT the LITç te'_year
LçTI-J UdI
losses are saicr to have occurrecr when trre prese't rratchery
i::î1"::"Ïavy
was first usecl.
- In,southland, eggs of brow' trout were corlectecr from the upper portions of
tlle Waiau River system.
.North-canterbury clrew its supplies very easily from trre
will
Selwy'
be
River. As
shown later, these figures åre basecl o. résults in ab'ormally favouraSle
operational years.
In South Canterbury,
prececling clistricts. This
outside districts.
operations were on a smaller scale than in the three
society, unlike the i-rther three, clicl not usuallv supply
The great bulk of the rainbow eggs collres flom a clistrict which clicl 'ot publis¡
clata on losses. 'rrre figures given ì-ãrate to rerativery smalr cluantities. Trre otag;
rai'bow ova i. 1935 hacr traverlecl an unusualry lor-rg way i' tl-re ,,gree',, st:rtc.
The losscs, as given ror 1929 there, are excrusive otãn "á¿itrorat 16.7 per cc't.
lost tl.rrough soltìe unspecifiecl mishap.
It rvoulcl apPear fror.n the foregoir-rg that losses oi pre-eyecl ova of L¡rorvn trout
vary tttlder the clifferent couclitiots encounterecl in the three n:rain supplvirrg
clistricts fronr possibly as little as 5.5 to 14 per cent., even i' the 'rost satisfactory
'v*ears' usually, losses in tliflerent rlistricts l-arìg'e rlp to at least 20 per ce't.
possibly fro'r
1-figurc
as low as 8 per cc't., lrut certainly higher than
North
that
canterl]ur)"
shown for
J3ecause a nurubeL c¡f cases of héavy-loss have
tlre gereral
bee' exclt*le