New Zealand Journal of Marine and Freshwater Research abstracts
Development and metabolic rate of stage I spiny lobster (Jasus edwardsii)
larvae under constant and fluctuating salinities
Michel Bermudes*
School of Aquaculture
Tasmanian Aquaculture and Fisheries Institute
University of Tasmania
Locked Bag 1-370, Launceston
TAS 7250, Australia
Arthur J. Ritar
Marine Research Laboratories
Tasmanian Aquaculture and Fisheries Institute
University of Tasmania
Nubeena Crescent, Taroona
TAS 7053, Australia
*Present address: 1 Minilya Avenue, White Gum Valley WA 6162, Australia.
email: m_bermudes@hotmail.com
Abstract The effects of fluctuating salinity on the
development and metabolic rate of stage I Jasus edwardsii larvae were
investigated. J. edwardsii larvae were reared from hatching through
to stage II under continuous salinity regimes at 28, 31, 34, and 37 psu,
and under repeated exposure to 28, 31, and 37 psu from a salinity of 34 psu.
Continuous exposure to salinities between 28 and 37 psu did not affect the
duration of larval development. In the repeated exposure treatments, only
larvae subjected to 28 psu developed slower than those in the 34 psu continuous
exposure group. Although post-moult growth to stage II was not suppressed
by fluctuating salinity in the 31 and 37 psu groups, larvae repeatedly exposed
to 28 psu and larvae under continuous salinities of 28, 31, and 37 psu were
significantly smaller than those from the 34 psu continuous treatment. The
effect of salinity acclimation on the respiratory response of mid-stage I
larvae was examined in a second experiment. The reduced oxygen consumption
of acclimated larvae at subnormal salinities (i.e., 28 psu) was characteristic
of stenohaline organisms, and overall there was little relationship between
metabolic rate and larval growth performance. From the results obtained in
this study we recommend the monitoring and control of environmental salinity
for the propagation of J. edwardsii larvae to prevent prolonged exposure
to suboptimal salinities.
Keywords Jasus edwardsii; larvae; salinity; growth;
oxygen consumption
M04060; Online publication date 31 May 2005 Received 22 March 2004; accepted
13 September 2004
New Zealand Journal of Marine and Freshwater Research, 2005, Vol. 39:
243-249
0028-8330/05/3902-0243 © The Royal Society of New Zealand 2005
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