Otter
Leech, commonly known as red worms, is a good natural feed for juvenile shrimps. It is rich in protein and oil to promote the growth of juvenile shrimp and increase its resistance to diseases. The leeches have a large amount of breeding, a short growth cycle, a low food level and a rapid growth, and are good natural feeds.
1, culture conditions: water temperature 15-25 °C (the optimum water temperature is 18-20 °C), like low light, the daily light is appropriate for 9-15h, pH value of 6-8, dissolved oxygen saturation of 7% -12% is suitable, oxygen consumption of organic matter is 20mg/l.
2. Cultivation method: Each square meter of the cultured leeches must be disinfected with quicklime 100g. The influent is filtered with 100 mesh mesh. Fertilizer is mixed with compost (animal manure) to make bacteria and algae multiply.
Rotifer
The rotifer is a small aquatic animal, which has the characteristics of fast growth and strong reproduction. Its body size, swimming speed and nutritional value are very suitable for starter feeds. The method of cultivating rotifers is very simple. Common species in the natural world are freshwater rotifers and seawater (brine and freshwater) rotifers.
Large-scale cultivation of rotifers can be used in earthen ponds or concrete pools. The cultivation procedures include clear ponds, algae breeding, daily management or regular collection, etc. Clearing pool is commonly used in bleaching powder of 60 mg/l, or 2 mg/l of rattan extract.
Artemia and its nauplii
Artemia nauplii is rich in protein and a large amount of fat, and its individual size (about 0.5mm) is moderate, which can be used as a good feed for nursery larvae and juveniles. Artemia adults are also good feed for adult shrimps.
1. Preservation of eggs: Storage and storage under dry conditions (with eggs below 9% moisture content). Eggs can be preserved for a long period of time. Hatchery eggs hatch at 2-3 months after incubation at room temperature. It is necessary to reduce, cryopreservation can extend the survival time of eggs, but eggs stored at low temperature must be left at room temperature for 1-2 weeks before hatching, otherwise it will reduce the hatching rate.
2, Artemia nauplii hatching attention to the problem: the eggs before hatching panning and disinfection, to clean the contaminants and parasites. The container was incubated with a conical flask to separate the hatched larvae and egg shells.
3. Conditions required for hatching: temperature 27-28°C, density of seawater 1.010g/ml or more, light intensity more than 1,000 lux, dissolved oxygen is saturated, and the eggs are suspended and churn when inflated, pH value is 8. -9.
4. Feeding newly hatched nauplii in time: The newly hatched larvae are of good quality and contain high energy. For example, the larvae fed with mink skin have a 20% and 27% reduction in their dry weight and energy.
Biological mud layer
The biological mud layer is a special biological community of benthic algae that reproduces and grows on the bottom surface of shrimp ponds. Among them, protozoa, nematodes, mollusk larvae, and autotrophic bacteria often have a comprehensive nutritional value and are ideal for juvenile shrimps. The feed.
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