Molluscan ResearchISSN 1323-5818
 An international journal of the Malacological Society of Australasia published by Magnolia Press

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Molluscan Research 25(1): 1-8; published 22 April 2005
Copyright © The Malacological Society of Australasia

The influence of culture conditions on the growth and biochemical composition of an algal feed for juvenile greenlip abalone (Haliotis laevigata)

D. WATSON*1, S. DAUME3, J. PRINCE2, L. BEAZLEY2 AND B. KNOTT2
1 The University of Western Australia, M090 Botany, 35 Stirling Highway, Crawley, W.A. 6009 Australia
2 The University of Western Australia, M092 Zoology, 35 Stirling Highway, Crawley, W.A. 6009 Australia
3 Department of Fisheries, Research Division, PO Box 20 North Beach, W.A. 6920 Australia
*Corresponding author: dwatson@plants.uwa.edu.au

Abstract

The diatom Navicula jeffreyi was cultured in seawater media of low, standard or high nitrate content (2.47, 12.35 and 24.71 mg NO3-N L-1, respectively) in high (22 3 mmol photons/m2/s) and low (4.7 0.8 mmol photons/m2/s) light conditions. The growth, survival and grazing rates of juvenile Haliotis laevigata Donovan, 1808 were monitored in response to the density and biochemical composition of N. jeffreyi cultured in each of the six treatments. Navicula jeffreyi Hallegraeff et Burford grown in high light had a proportionally lower protein content and a higher carbohydrate and fat content (22 0.6%; 17.6 1.5%; 7.5 0.7%, respectively) compared to the content of diatoms grown in low light (30 0.6%; 14.3 2.5%; 4.7 1%, respectively). Under low light, the carbohydrate content of N. jeffreyi was marginally higher in low nitrate treatments (17%) compared to standard (14%) and high (12%) nitrate. Juveniles grazed a larger number of diatoms when the protein content of the diatoms was low, possibly compensating for the lower protein levels. In high light, dense N. jeffreyi biofilms produced elevated pH levels which most likely resulted in the mortality of a large number of juvenile H. laevigata. This study indicates that changes in light intensity and nitrate concentration under which the diatom N. jeffreyi were cultured, affected the growth, survival and grazing rates of juvenile H. laevigata.

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Copyright © 2005 Magnolia Press Published : 22 April 2005