1 The leech leeches, commonly known as red worms, are a good natural feed for juvenile shrimps. They are 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 for artificial cultivation.
1.1 culture conditions water temperature 15 °C -25 °C (the optimum water temperature is 18 °C -20 °C), like low light, daily light is suitable for 9h-15h, pH value is 6-8, dissolved oxygen saturation 7%-12% is suitable, oxygen consumption of organic matter is 20mg/l.
1.2 Cultivation methods Cultured leeches in the pool must be disinfected with quicklime 100g per square meter. The influent is filtered with 100 mesh mesh and fertilized with compost (horse dung) to allow bacteria and algae to multiply.
The rotifer rotifer is a small aquatic animal that has the characteristics of fast growth and strong fertility. Its body size, swimming speed and nutritional value are very suitable as feed forage. 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.
3 Artemia and its nauplii Artemia nauplii is rich in protein and fat, and its individual size (approx. 0.5mm) is moderate. It can be used as a good feed for nursery larvae and juveniles. Artemia adults are also shrimps. Good feed.
3.1 Eggs are stored and stored under dry conditions (with eggs below 9% water content) under vacuum conditions. 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 decline, cryopreservation can extend the survival time of eggs, but eggs stored at low temperature must be kept at room temperature for 1 week to 2 weeks before hatching, otherwise it will reduce the hatching rate.
3.2 Artemia nauplii hatching attention issues
3.2.1 Eggs are washed and disinfected before hatching to clean contaminants and parasites.
3.2.2 Incubate the container with a conical flask to separate the hatched larvae and egg shells.
3.2.3 The conditions required for hatching are 27°C-28°C, seawater density is more than 1.010g/ml, light intensity is more than 1000 lux, dissolved oxygen is saturated, and the eggs are suspended and churn when inflated. The pH is 8-9.
3.2.4 Newly hatched nauplii should be fed in a timely manner. Because the newly hatched larvae are of good quality and contain high energy, such as larvae fed after molting, their dry weight and energy are reduced by 20% accordingly. 27%.
4 Biological mud layer The biological mud layer is a layer of breeding and growth of shrimp ponds. The special biological communities of benthic algae, among which the common protozoa, nematodes, mollusk larvae and autotrophic bacteria, have a full nutritional value. Juvenile ideal feed.
1.1 culture conditions water temperature 15 °C -25 °C (the optimum water temperature is 18 °C -20 °C), like low light, daily light is suitable for 9h-15h, pH value is 6-8, dissolved oxygen saturation 7%-12% is suitable, oxygen consumption of organic matter is 20mg/l.
1.2 Cultivation methods Cultured leeches in the pool must be disinfected with quicklime 100g per square meter. The influent is filtered with 100 mesh mesh and fertilized with compost (horse dung) to allow bacteria and algae to multiply.
The rotifer rotifer is a small aquatic animal that has the characteristics of fast growth and strong fertility. Its body size, swimming speed and nutritional value are very suitable as feed forage. 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.
3 Artemia and its nauplii Artemia nauplii is rich in protein and fat, and its individual size (approx. 0.5mm) is moderate. It can be used as a good feed for nursery larvae and juveniles. Artemia adults are also shrimps. Good feed.
3.1 Eggs are stored and stored under dry conditions (with eggs below 9% water content) under vacuum conditions. 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 decline, cryopreservation can extend the survival time of eggs, but eggs stored at low temperature must be kept at room temperature for 1 week to 2 weeks before hatching, otherwise it will reduce the hatching rate.
3.2 Artemia nauplii hatching attention issues
3.2.1 Eggs are washed and disinfected before hatching to clean contaminants and parasites.
3.2.2 Incubate the container with a conical flask to separate the hatched larvae and egg shells.
3.2.3 The conditions required for hatching are 27°C-28°C, seawater density is more than 1.010g/ml, light intensity is more than 1000 lux, dissolved oxygen is saturated, and the eggs are suspended and churn when inflated. The pH is 8-9.
3.2.4 Newly hatched nauplii should be fed in a timely manner. Because the newly hatched larvae are of good quality and contain high energy, such as larvae fed after molting, their dry weight and energy are reduced by 20% accordingly. 27%.
4 Biological mud layer The biological mud layer is a layer of breeding and growth of shrimp ponds. The special biological communities of benthic algae, among which the common protozoa, nematodes, mollusk larvae and autotrophic bacteria, have a full nutritional value. Juvenile ideal feed.