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Abstract

Early stage phyllosoma larvae of the spiny rock lobster Jasus edwardsii were examined for swimming speed,
feeding, oxygen consumption and nitrogen excretion as instantaneous performance indicators when exposed to
different irradiance levels. Swimming speed was measured in recently hatched Stage I larvae while all other
parameterswere measured in larvae from hatch tomid-Stage V. The swimming speed of recently hatched Stage I
phyllosoma increased logarithmically between light intensities of 2.9×1014 and 1.8×1016 quanta s−1 cm−2
indicating that, within this range, swimming activity was only suppressed at the lowest irradiance level. Larvae
examined under dark (no light) conditions showed lower feed intake, oxygen consumption and nitrogen
excretion than larvae under low (7.7×1012 q s−1 cm−2) and high (3.9×1014 q s−1 cm−2) light intensities, and this
was a consistent pattern observed throughout development from hatch to Stage V. There was no difference in
feeding, oxygen consumption and nitrogen excretion between larvae exposed to low and high light intensities.
However, from mid-Stage I to mid-Stage V, the metabolic feeding efficiency (feed intake:oxygen consumption
ratio) was consistently higher in larvae exposed to low light intensity than in phyllosoma assessed in the dark
and under high irradiance. A light intensity of about 7.7×1012 quanta s− 1 cm− 2 and no higher than
3.9×1014 quanta s− 1 cm− 2 is recommended to stimulate feeding and optimisemetabolic feeding efficiency in
early larval stages of J. edwardsii.
© 2008 Elsevier Inc. All rights reserved.

Item Type:	Article
Authors/Creators:	Bermudes, M and Ritar, AJ and Carter, CG
Keywords:	Light intensity Oxygen consumption Nitrogen excretion Feeding Jasus edwardsii Larvae
Journal or Publication Title:	Comparative Biochemistry and Physiology - Part A: Molecular & Integrative Physiology
ISSN:	1095-6433
DOI / ID Number:	10.1016/j.cbpa.2008.02.023
Additional Information:	The definitive version is available at http://www.sciencedirect.com
Item Statistics:	View statistics for this item

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