TW 2400
12% dry weight Frozen formula. Thalassiosira weissflogi is a large diatom (6-20µm x 8-15µm) that is used in the shrimp and shellfish larviculture industry.
TW 2400 for Bivalves Technical Data Sheet (PDF)
Showing information for Bivalve Larvae, Spat and Broodstock below...
Product Description
12% dry weight Frozen formula
Thalassiosira weissflogii is a large diatom (6-20µm x 8-15µm) that is used in the shrimp and shellfish larviculture industry. This algae is considered by several hatcheries to be the single best algae for larval shrimp.
The large cell size (16 X the biomass of Chaetoceros and 3 X the biomass of Tetraselmis) extends the algae feeding period until the end of the PL stage. During the winter this algae is about 15 microns, but shrinks to about 5 microns during the summer.
The color of TW varies from brown to green to yellow, depending on the amount of chlorophyll in the culture. This color change does not in any way affect the quality of the algae.
Strain: CCMP1051
Applications & Benefits
Bivalve Applications
- Peak Load Supplement
- 100% live algae replacement
- Remote set
- Back-up feed supply
- For use with open tanks, silos, bottle upwellers, header tanks, cultch tanks and depuration tanks
- Effective for many species including artemia, crab, sea cucumber and some copepods
Benefits
- Biosecure
- Exceptionally Clean
- Easy to use
- Always available
- Balanced Lipids (DHA, EPA), protein and carotenoids
- Effective feed supplement and live algae replacement
Directions & Feeding
Bivalve Directions
- Defrost overnight in a refrigerator.
- When water is circulated with a centrifugal pump, such as with an upweller, add in front of the pump intake and the pump will disperse the algae cells.
- When feeding into open tanks or header tanks, pre-dilute the algae 10:1 with system water
a. Add system water to a small bucket.
b. Add TW 2400 and stir.
c. DO NOT BLEND; it is unnecessary and may damage the algae cells.
d. Pour into larvae or spat tank.
e. Pouring through a 20–micron screen can improve dispersion. - Feed according to the table below. Adjust dosage to meet the needs of your hatchery and larvae.
- Refrigerate bottle when not in use 6. Use within 8 days of defrosting
TYPICAL FEEDING RATION
Larvae
Feed according to shell length. Shell length on a given day is an estimate. Larviculture may run up to 20 days.
Daily Feed Rates per million larvae, Crassostrea virginica
(from FAO Protocol ‘Hatchery culture of bivalves 2004’)
| Shell Length | Day | Shellfish Diet (ml) | = | Live Isochrysis(L) @4x106 |
|---|---|---|---|---|
| 75 | 2 | N/A | = | N/A |
| 95 | 3 | N/A | = | N/A |
| 100 | 4 | N/A | = | N/A |
| 115 | 5 | N/A | = | N/A |
| 130 | 6 | N/A | = | N/A |
| 145 | 7 | 4.5 | = | 5.1 |
| 160 | 8 | 5.7 | = | 6.6 |
| 190 | 9 | 8.2 | = | 9.5 |
| 220 | 10 | 10.8 | = | 12.4 |
| 240 | 11 | 12.5 | = | 14.4 |
| 260 | 12 | 14.2 | = | 16.3 |
| 270 | 13 | 15.1 | = | 17.3 |
| 280 | 14 | 15.9 | = | 18.3 |
Spat
Feed by Live Weight
• 0.5ml TW 2400 per gram live weight of spat per day
Broodstock Conditioning and Fattening
Typical Broodstock Feed Rates
- 0.025–0.05 ml TW 2400 per gram wet meat weight per day*
OR:
- 0.24–1.0 ml TW 2400 per adult animal per day (depending on feed ration and size*)
- Provides between 2% and 4% dry weight feed for dryweight of meat
Storage & Technical Data
| Packaging | 1 liter bottle |
|---|---|
| Storage | 2 years shelf life when frozen. Use within 8 days of defrosting |
| Tip | Keep frozen before defrosting, refrigerate after defrosting |
| Physical Properties | |
|---|---|
| Appearance | Viscous brown concentrate |
| Algal cell size | 10 - 15 microns |
| Cell Density | ~0.64 Billion cells per ml |
| Algal Biomass | 120g Dry biomass/L |
| Composition of Dry Algal Biomass | |
|---|---|
| Protein | 54.5 % |
| Lipid | 14.2 % |
| Carbohydrate | 18.0 % |
| Ash | 21.0 % |
| Composition of Liquid Product | |
|---|---|
| Protein | > 9.8 % |
| Lipids | > 2.5 % |
| Carbohydrate | > 3.2% |
| Ash | < 10 % |
| Moisture | < 87 % |
| Microbial Specification | |
|---|---|
| Coliform Bacteria | < 0.3 mpn/mL |
| Salmonella | Negative |
| Known pathogenic marine bacteria | Negative |