Feeding and gut evacuation of cultured juvenile spiny lobsters, Jasus edwardsii.

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dc.contributor.author Simon, CJ en
dc.contributor.author Jeffs, Andrew en
dc.date.accessioned 2012-05-09T23:01:28Z en
dc.date.issued 2008-08 en
dc.identifier.citation Aquaculture 280(1-4):211-219 Aug 2008 en
dc.identifier.issn 0044-8486 en
dc.identifier.uri http://hdl.handle.net/2292/17818 en
dc.description.abstract Low feed consumption has been suggested as a major impediment for the development of effective formulated diets for spiny lobsters. To seek an explanation for the low feed consumption, this study compared the feed consumption, appetite revival, foregut evacuation and fecal production of different sizes of spiny lobster Jasus edwardsii juveniles fed a fresh natural diet (i.e. mussel flesh) and a dry formulated diet. In addition, the effect of feeding frequency was determined by feeding juvenile lobsters the same ration of formulated diet at different time intervals. i.e., same ration delivered 3 week− 1, 1 day− 1, 2 day− 1, 5 day− 1 and 5 night− 1. Lobster (10–15 g) growth and feed consumption (1.15% BW day− 1) was maximized when receiving a single ration daily of the formulated diet. A slow appetite revival (AR > 18 h) on the formulated diet was consistent with the negative effect of increasing feeding frequency on growth and consumption. In addition, there appeared to be no major advantage in dry matter intake by providing the nutrient dense dry formulated diet to Jasus edwardsii. Lobsters fed fresh mussel flesh (79.8% moisture) consumed similar levels of dry matter as those lobsters fed the dry formulated feed (7.3% moisture). This appears to be due to high moisture gain and expansion of the dry feed in the lobster foregut. Foregut evacuation lasted 10 h for the two diets but a delay in initial foregut evacuation and processing of the formulated diet was evident, and may have negatively affected feed consumption, appetite revival and dry matter digestibility (61.2%) of the dry formulated diet compared to the mussel flesh diet (89.2%). Appetite revival on mussel flesh was almost complete by 12 h after a satiation ration and was governed primarily by the rate of foregut evacuation. Differences in the timing of foregut evacuation and fecal production between the two diets suggested that a greater proportion of the formulated diet entered the midgut directly. The results indicate that J. edwardsii cannot achieve high levels of feed consumption on formulated diets because gut throughput is reduced due to a small foregut capacity, expansion of the feed post-ingestion, lengthy foregut filling time (1–2 h) and clearance time (10 h), combined with slow gut throughput time (34–42 h) and appetite revival (> 18 h). A slow appetite revival and difficulties in processing and digestion of formulated diets appear as major issues to be resolved to improve the performance of formulated diets required for the commercial aquaculture of J. edwardsii and possibly other spiny lobsters. en
dc.publisher Elsevier en
dc.relation.ispartofseries Aquaculture en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained form http://www.sherpa.ac.uk/romeo/issn/0044-8486/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Feeding and gut evacuation of cultured juvenile spiny lobsters, Jasus edwardsii. en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.aquaculture.2008.05.019 en
pubs.issue 1-4 en
pubs.begin-page 211 en
pubs.volume 280 en
dc.rights.holder Copyright: Elsevier en
pubs.end-page 219 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 90163 en
pubs.org-id Science en
pubs.org-id Marine Science en
pubs.record-created-at-source-date 2010-09-01 en

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