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Role of lipids in the diet of cultured and wild rock lobster larvae

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Nelson, Matthew Morgan (2003) Role of lipids in the diet of cultured and wild rock lobster larvae. PhD thesis, University of Tasmania.

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Abstract

Food web interactions and appropriate forms of feed to promote growth and survivorship
of phyllosoma larvae of rock lobsters in culture were examined. In particular,
the role of key lipid nutrients has been investigated. These important steps are
critical for closing the life cycle of rock lobster in aquaculture. Several protocols for
enrichment of brine shrimp, Artemia, with essential polyunsaturated fatty acids
(PUPA) were trialed. For the first time, Artemia were simultaneously enriched with
essential PUPA [arachidonic (AA), eicos~pentaenoic (EPA) and docosahexaenoic
(DHA) acids] in ratios specific to, and based on analyses of, wild phyllosomata.
Newly-hatched phyllosomata of southern rock lobster, Jasus edwardsii, were fed enriched
Artemia and on-grown to stage V in flow-through aquaria. Larvae decreased
in total lipid from stages 1-V. The major lipid class in all phyllosomata was polar
lipid (PL), followed by sterol (ST), with no triacylglycerol (TAG) detected. Cultured
phyllosomata had levels of AA and EPA similar to wild phyllosomata, although
lowerDHA.
To elucidate feeding capabilities, phyllosomata of packhorse lobster, Jasus verreauxi,
were presented various food items and given chemical/tactile stimulation to
induce feeding response. Phyllosomata are capable of processing hard prey items,
and become entangled and fail to feed on soft tissue, such as jellyfish and mussel gonad.
This represents the first documentation of the ability to process and ingest food
by live phyllosomata.
Results from feeding trials, and analyses of potential prey items and pueruli,
indicate that phyllosomata may require PUPA in PL form, which is largely unavailable
via Artemia. Therefore, J. edwardsii phyllosomata were on-grown from newlyhatched
to stage V, in static culture with antibiotics. Feeding larvae utilizing a PLrich
diet attached to mesh was compared to feeding with Artemia, enriched with a
TAG-rich or an ethyl ester (EE)-rich nutrient source. For Artemia-fed phyllosomata,
survival was high and total lipid remained generally constant to stage V. Both were
notably higher than observed in previous feeding trials. The main fatty acids were
oleic, linoleic, palmitic, EPA, stearic, cis-vaccenic, AA and DHA. Essential PUPA
decreased from newly-hatched to stage V, although phyllosomata had absolute levels
of essential PUP A greater than prior trials. The PL-rich diet displayed potential, as
presence of faecal trails and molting confirmed that phyllosomata were consuming
the diet.
This thesis has furthered understanding of phyllosomata physiology in challenging
traditional ideology that larvae require PUPA in TAG form (i.e. Artemia). It
demonstrated that lipids and PUP A are important nutritional components in rock lobster
larvae. Feeding lipid-enriched Artemia was proven successful in early stages.
The development of diets suitable for later stage larvae, with emphasis on enhancing
PL, is a new and promising approach. Advancement of these concepts will facilitate
successful culture of rock lobsters.

Item Type: Thesis (PhD)
Keywords: Spiny lobsters, Artemia, Lipids in nutrition
Copyright Holders: The Author
Copyright Information:

Copyright 2003 the Author. The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).

Additional Information:

For consultation only. No loan or photocopying permitted until 16 July 2004. Thesis (Ph.D.)--University of Tasmania, 2003. Includes bibliographical references

Date Deposited: 03 Feb 2015 03:06
Last Modified: 11 Mar 2016 05:54
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