02890ca a2200421 4500
315390
nz
20221208111939.0
171030s1995 nz 000 0 eng d
OI9500273
(Sirsi) 315390
(Sirsi) 315390
B34
A52
Illingworth, J.
(NIWA. Wellington)
Report to the British Council on the third stage of the dredge oyster, Tiostrea lutaria, project /
J. Illingworth and S.D. Utting.
Wellington [N.Z.] :
NIWA,
1995.
15 pages ;
30 cm
NIWA internal report (fisheries) ;
no. 243
"Not to be cited without permission of the author(s)."
5 tables.
Oysters sampled from the Menai Straits on 13th June 1995 and opened between the 14th and 23rd June yielded between 17 and 18% brooding adults carrying larvae ranging from late blastula through to pediveliger. A total of 23 broods of larvae at various stages of development were collected along with data on parent shell dimensions and numbers of larvae. Samples were preserved for the measurement of larval shell dimensions, dry weights and food reserves by biochemical analysis. Eight broods of larvae from veliger to late veliger were divided in half and grown through to pediveliger outside the parents. One batch of larvae from each parent was fed algal food and the other not. The larvae were again sampled for biochemical analysis just prior to settlement and sub-samples settled onto glass plates for spat growth and mortality measurements. Both the biochemical analyses and the spat growth and mortality results showed no apparent benefits in feeding larvae. The high success rate of rearing larvae outside the parent oysters is attributed to the very high levels of stored lipids. A visit was organised to the Seasalter Shellfish commercial oyster hatchery at South Walney Island and two days were spent with the scientific staff at MAFF, Conwy, working on flatfish culture.
DREDGE OYSTERS
49051
TIOSTREA LUTARIA
51568
LARVAE
44788
HATCHERIES
37673
AQUACULTURE
470
LARVAL DEVELOPMENT
32298
ANIMAL PHYSIOLOGY
16581
Utting, S. D.
National Institute of Water and Atmospheric Research (N.Z.)
3541
British Council
50869
201886
382204
Wellington, NZ : [NIWA], 1995-1996.
J05097
NIWA internal report (fisheries)
314127
201886
382205
Wellington, NZ : [NIWA], 1995-1996.
J05098
NIWA internal report (fisheries)
314127
NIWA internal report (fisheries)
no. 243
http://docs.niwa.co.nz/library/private/NIRF243.pdf
For NIWA staff only
BOOK
0
udc
144983
144983