Effects of restricted feeding regimes on growth and feed conversion on juvenile green sea urchin, Strongylocentrotus droebachiensis
Article first published online: 12 SEP 2011
© 2011 Blackwell Publishing Ltd
Volume 43, Issue 10, pages 1515–1519, September 2012
How to Cite
Siikavuopio, S. I., James, P., Mortensen, A., Samuelsen, T. A. and Dale, T. (2012), Effects of restricted feeding regimes on growth and feed conversion on juvenile green sea urchin, Strongylocentrotus droebachiensis. Aquaculture Research, 43: 1515–1519. doi: 10.1111/j.1365-2109.2011.02954.x
- Issue published online: 5 SEP 2012
- Article first published online: 12 SEP 2011
- Troms Kråkebolle A/S
- juvenile sea urchin;
- Strongylocentrotus droebachiensis;
- feed rations;
- feed utilization
Groups of juvenile green sea urchin, Strongylocentrotus droebachiensis (average wet weight = 3.3 g), were fed five different dry feed rations (0.2%, 0.4%, 0.8%, 1.2% and 2.4% of their body weight per week) under constant light and temperature conditions for 160 days (Experiment I) in groups to examine growth effects, and for 40 days as individual treatments (Experiment II) to examine feeding efficiency. There was 100% survival of the sea urchins during both experiments. In Experiment I, the lowest ration group (0.2%) had significantly lower growth than the rest of the groups. There was no significant differences in growth between the sea urchin fed ration over 0.4% dry feed of the body wet weight per week.
In Experiment II, the lowest feed ration groups (0.2%) had significant lowest growth but had the best feed conversion ratio (FCR), using 0.5 g of feed of dry feed per gram of sea urchin wet weight body growth. The FCR increased with increasing feed ration and the 2.4% group had the poorest FCR, using 1.3 g of feed per gram weight gain. Results from Experiments I and II illustrate that juvenile green sea urchin can grow at a restricted feed ration that is under maximum feed intake, without reduction in growth.