|
520 McGlincy Lane #1, Campbell, CA 95008 |
Shipping internationally to over 67 countries. |
|
|
Subscribe to the Reed Mariculture Newsletter | |
| Browse Archives at groups.google.com | ||
|
The current time is 0: 18: 52 AM
|
|
Feeding Shellfish with Instant Algae |
||||||||||||||||||||||||||||||||
|
The most common technique for feeding shellfish is by monitoring water color. Simply add a dose of Instant Algae Shellfish Diet to you tank and watch how long it takes for the animals to clear it. If they clear it in less than 60 minutes, add more. The recommended schedule for juvenile and adult shellfish is 1-2 times each day, but can be as little as once per week. The most scientific information we have for determining feed amounts is from a study done in 1999 on post-set Crassostrea virginica oysters. The study measured feed rates for two objectives: optimal food conversion and optimal growth rate. The determination was that optimal food conversion occurred at 2% daily dry weight and optimal growth rate occurred at 5%. For example, if you had 100 grams of oyster spat and wanted optimal growth rate you would feed them 5 grams of dry weight algae each day. If you were feeding them Instant Algae Shellfish Diet which has a dry weight of 9% you would need to use 55 grams of algae concentrate each day (5 grams / 9%). If you wanted optimal feeding conversion you would use 22 grams of Shellfish Diet (2 grams / 9%). You can also use this formula for broodstock conditioning but you must first subtract the shell weight, leaving only the meat weight. For example, if you have 1000 grams of broodstock and 60% of the weight is shell, calculate the feed for 400 grams of meat weight. You can also reduce the intake to 1% of daily dry weight. We strongly recommend using the Shellfish Diet rather than a single food such as Isochrysis. A mix of algae will usually provide much better results. To download a spreadsheet that will help you calculate the amount of each algae to feed, click here. For information about using Instant Algae please click here. For best results use continuous feeding or in batch several times each day. Since bivalve shellfish are filter feeders good aeration and circulation will improve feeding rates and keep the algae well suspended in the water column.
Wikfors, G.H., J.H. Alix, M.S. Dixon, and B.C. Smith. 1999. Feeding rations and regimes for post-set oysters, Crassostrea virginica, fed cultured microalgae in a land-based nursery. J. Shellfish Res. 18, 279-280 (abstract). |
|||||||||||||||||||||||||||||||||
|
|
|||||||
|
|||||||
|
|
||||||