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The balancing act: Protein, lipid and seaweed dietary levels to maximize gonad quantity in a wild‐caught sea urchin
journal contribution
posted on 2021-01-01, 00:00 authored by Fletcher Warren‐Myers, Giovanni TurchiniGiovanni Turchini, Stephen E Swearer, David FrancisDavid Francis, Tim DempsterSea urchin gonads (roe) are a prized global sea food commodity, with growing demand driving the need for urchin roe enhancement aquaculture. Effective roe enhancement of urchins using formulated feeds require species‐specific optimization and an understanding of the interactions between key dietary components (e.g. protein, lipid, carbohydrate, energy and/or algal supplements). Here, we tested 18 formulated feeds on the sea urchin Heliocidaris erythrogramma, collected from barrens. The 18 iso‐energetic (~20 MJ/kg) feed combinations contained one of three protein levels (250, 375 or 500 g/kg), three lipid levels (73, 101 or 131 g/kg) combined with a single (45 g/kg Sargassum spp.) or multiple (45 g/kg Sargassum spp., 25 g/kg Solieria robusta, 25 g/kg Ulva lactuca) dried algal supplement. From two consecutive 12‐week enhancement trials, the most optimal feed type contained 375 g/kg protein, 73 g/kg lipid and a 45 g/kg algal supplement (Sargassum spp.) and produced gonad indices of 18.5 ± 0.4% (Trial 1) and 21.7 ± 1.2% (Trial 2). Across feed types, there was no significant difference in the proportion of marketable quality (A and B grade) roe produced (56%–85% Trial 1, 65%–85% Trial 2). We conclude that roe enhancement of H. erythrogramma collected from barrens is highly feasible.
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Journal
Aquaculture NutritionIssue
Online Version of Record before inclusion in an issueArticle number
13243Publisher
Wiley-Blackwell PublishingLocation
Chichester, Eng.Publisher DOI
ISSN
1353-5773eISSN
1365-2095Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2021, John Wiley & SonsUsage metrics
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