If the DO is low over a sustained period of time - say a 5 to 7 days, you will notice the shrimp changing from a green to reddish. This is reportedly caused by development of an oxygen carrying pigment - hemoglobin or similar pigment. Harvest is done with a standard aquarium net. The larger netting allows immature shrimp to remain in culture. Cultures which are not overharvested will become self sustaining in 4 to 6 weeks.
Brine shrimp are non-selective, continuous filter feeders.
Therefore, brine shrimp can essentially deliver food components or nutrients to your fish through bioencapsulation or bioenrichment. These bioenrichment formulas are primarily available through aquaculture supply companies in one liter sizes for marine shrimp and fish hatcheries. These formulas contain antioxidants as preservatives and may be fortified with vitamins. Add some water to the fish oil and lecithin and blend for around 30 seconds. The fish oil emulsion can be stored in a refrigerater for several weeks.