QUESTION:
I am looking for information on using the spray-dried algae,
(Schizochytrium sp.) otherwise known as algamac-2000 as an enrichment for Artemia and rotifers.
I have the paper by Barclay and Zeller, 1996 but this looks at enriching
very small volumes of live food. I am interested in results on a
commercial scale level. Since enriching live food is affected by such things as temperature and oxygen levels the results for enriching
in one liter tanks will likely be different than that in 1000 liter tanks. We will be harvesting 100-200 million Artemia a day so I would appreciate some response from actual buyers and users of the product.
I am very interested in any comparisons made with oil emulsion products and other enrichments.
How do the fatty acid levels compare, any differences in growth rate,
survival, stress resistance...etc?
Dena Wiseman <dena@morgan.ucs.mun.ca>
COMMENTS 1:
I have been using Algamac-2000 for about one month in the commercial rearing of the gilt-head seabream. I enrich about one billion rotifers a day in 2 - 3 cubic meters of media. Although it is still too early so say anything conclusively, I have not encountered any problems with the Algamac-2000. Larval survival is as good as using oil enrichments. Since there is less oil in the enrichment media, I believe that the water quality in the enrichment tanks and therefore, indirectly, in the larval rearing tanks, is better. This is a subjective observation and I do not have any hard data.
Glen Pagelson
Ardag Ltd.
<GlenPagelson@ardom.ardom.co.il>
COMMENTS 2:
I am very interested by your experience with Algamac-2000. Could you precise if you cultivate the rotifers with the Algamac-2000 or if you only enriched them.
Herve Lucien-Brun
Sepia
Immeuble International - A2
13, avenue de la Gare
78181 Saint Quentin Yvelines Cedex
Tel : (33) 1.30.12.97.75
Fax : (33) 1.30.57.22.69
Email : sepia@worldnet.fr
COMMENTS 3:
I only enrich them
Glen Pagelson
<GlenPagelson@ardom.ardom.co.il>
COMMENTS 4:
Has anyone used Algamac -2000 with bivalve larvae, or for that matter
any other supplements to microalgal diets?
If you have, what have been your experiences, survival / growth
I am interested in trialing some off the shelf additives/emulsified
lipid products with mussel larvae in particular.
Sam.J. Buchanan
Cawthron Institute.
98 Halifax St.
Pvt Bag 2.
Nelson. N.Z.
TEL:03 5482319
FAX:03 5469464
Email: <sam @ environment .cawthron.org.nz>
COMMENTS 5:
Anyone interested in Algamac-2000 can contact the distributor, Aquafauna Biomarine (Mr. Leland Lai) at aquafauna.bio-marine@worldnet.att.net. Mark Freeman and Phil Boing will be presenting a paper on the use of this feed additive in rearing bivalve seed at the WMS meeting. Several field trials have been conducted using this product to enrich Artemia nauplii and Leland could provide this information.
Dennis T. Walsh
Walsh Consulting Phone: (508) 385-2415
21 Pilgrim Rd. FAX: (508) 385-2415
Dennis, MA 02638 Internet: dwalsh@capecod.net
COMMENTS 6:
We have trialed Algamac 2000 as a supplement to raw seawater for pearl oyster spat. We also tried Microfeast L-10 and MB-30. The results for all of the artificial diets were poor, with feeding rates of 0.1 and 0.5 mg/l not promoting growth over unfed controls. In contrast, algal fed spat showed a daily growth rate of 3-4% (live weight). However, pearl oyster spat are generally difficult feeders, and you may have better results with mussel larvae. Dr Paul Southgate at James Cook University (Queensland, Australia) has investigated the use of these artificial diets with pearl oyster larvae with mixed results. I suggest that you e-mail him at paul.southgate@jcu.edu.au.
David Mills
Darwin Aquaculture Centre
GPO Box 990
Darwin NT 0801
phone +61 8 8999 4371
fax +61 8 8999 4193
davmills@ozemail.com.au
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