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

areast much fished by visitors, the highest proportion of local resident
anglers is in the south and south-eastern parts of the South rsrand.
(5) rn most districts the greater part of revenue has been invested in
hatchery work.
(6) In the initial acclimatization phase of fisheries work, hatcheries
served a useful purp'ose in_ permitting the proper reception of eggs from
abroad and the assembly of stocks toi ¿istribuiiorr.
- (7) From very small seedings, made in most cases very long ago, stocks
have developed weil or poorry, according largery as the Jnrrironmerrts have
been suitable or otherwise for the trãtut""t irãprg",;", survivar, and
growth of trout. To-day distribution and densiiy of ãto"Ls reflect in ¡nost
cases the suitabirity of waters for naturar pr,ópagation rather than the
extent of releases of artificially propagated fish.
. (Ð A':tificial propagation, as pr4ttised for the maintenance of stocks
in New zealanð,, does not add silnificantry, if at ail, to the totar quantity
of trout, and is not usuaily an appreci"Lly -or" "ffi"i"rrt process than
natural propagation.
(9) Eggs have been colrected from wild stocks where they have been
most easily obtainabre, rathe' than from otherwise unexproited stocks or
from stocks in waters where it was known that eggs rraa " particurarly
poor,expectation of survival.
(10) the exploitation of different stocks for their eggs incrudes cases
where not only the fish stripped, but many more, were denied access by
these operations to good spawning grounds; but it includes one case where
most eggs removed have been in excess of what could have been accommo_
dated by available spawning ground.
(11) Artificial propagation, even
for maintenance of fisheries, cannot
fraction of,the total eggs produced.
to eggs taken solely from waters
expectation of loss, it could not effec
(12) Quantities of eggs handled in h¿tcheries have comprised small
fractions of those availabre in a very r*io *"t"r., ""iinìt,
transfer has
not effected more than a nominar reduction of stocks
collected in districts
or where
more than nominar additions to stocks
resulting i' aistricts
young
where
fish have been released.
(13) rn particular \Maters-namery, certain lakes
favoured
where conditions have
survival exceptionalry-sÁall but useful fisheries
maintained
have been
by transfers of fish, some of which have been hatcheries.
drawn from
(14) Preoccupation with the artificial propagation ol the fragmentary
part of the totar eggs handled in the hatcheiies has red to the negrect of
the reasonabre protectio" .g{ _"1a"ral spawners and of their progeny and
the neglect of other possibilities of füheries manage*"ri, certainl5r not
more,. and,possiþly less, speculative than artificiat prîpagation,
2l
Fisheries bulletin (N.Z. Marine Dept.) no. 9 (1948)
I