Larval Breeding of New Shrimp Shrimp
2019-09-08 00:03:41
1. Cultivation of nauplii The nauplii have a small body, no section, with 3 pairs of shorter appendages, tail pairs of tail spines, no complete mouthparts and digestive organs, and appendages made in water "Skipping" movement. No nauplii have to be molted six times and divided into six phases.
The nauplii rely on its own body yolk as a nutrient, and it should fertilize the breeding alveolar algae according to the biological condition of the feed in the pond for feeding after the larvae metamorphose. The pool water requires a depth of 40 to 70 cm. The amount of fertilizer applied is 2 g of nitrogen fertilizer and 0.2 g of phosphate fertilizer per ton of water. The water color is preferably yellow-green. The nauplii are most afraid of direct sunlight. The illuminance should be controlled within 1,000 lux and the aeration volume should be around 1%. In the case of water temperature of 25-28°C and salinity of 22 ‰-26 ,, the nauplii develop metamorphosis to zoea in 2 to 3 days.
2. The larvae of the zoea are bred by the somatic segmentation of the zoea larvae. There are obvious red pigments around the breastplate, tailbone, and ocular handles. The complete mouthparts and digestive organs will appear. They will ingest phytoplankton, and they will also feed on plankton during the later period. Animals, do "butterfly swimming" campaign. The warty larvae had three times of molting, gradually appearing compound eyes, frontal horns, and tail limbs. The tail section was enlarged and the tail was exposed.
The gravid larvae began feeding, and the density of the monocytic algae should be controlled between 150,000 and 200,000/ml. The water color should be yellowish-brown and later tea brown. The first stage of juvenile zoea can be properly fed with yeast and soya milk every day, and 3-6 grams per ton of water will be fed 4-6 times. For the second period of feeding larvae can be fed egg yolk and a small amount of crab paste, crab meat, with a 150-mesh sieve filter, the daily amount of 4 to 10 grams per ton of water. The amount of animal feed fed to the third stage of zoea larvae was slightly increased and filtered through a 120 mesh sieve. Every day, add 15 to 20 centimeters of water. After filling the water, change the water every day by 15 to 20 centimeters. The inflation rate is slightly more 1%, and the illuminance is controlled within 1,500 lux. At the temperature of 25-30°C and the salinity of 22 ‰ to 26 蚤, the sickling larvae develop metamorphosis to larval prawn after 3 to 4 days.
3, the cultivation of shrimp larvae The larvae of the larvae are thin and small, and the cephalothorax and the abdomen are distinctly bordered. The appendages of various parts are complete and begin to take the shape of shrimp. Feeding plankton, mainly zooplankton, molting 3 times, divided into 3 phases.
The food intake of the larval rearing prawn increased, but the predation ability was poor, and almost no Artemia larvae could be fed (this is different from the prawn and shrimp). At this time, the water color is light brown, the density of monocytic algae is 50,000 to 100,000 per milliliter, the illumination is controlled within 3,000 lux, the amount of water per day is 1/3 to 1/2, and the aeration rate is increased to 1.5%. Under water temperature of 25-30 °C and salinity of 22 ‰ to 26 ‰, the prawn developed metamorphosis to prawn after 4 to 5 days.
4. Cultivation of young prawn New prawn prawn has serrations on the upper edge of the forehead and no teeth on the lower edge. The appendages are short, the whip is long, there are red and white stripes, and there are many gray spots on the body. Prawns swim horizontally, attached to the wall, have latent habits, and have poor mobility. Dietary complexity of young shrimp, especially benthic diatoms at the bottom of the pool is preferred. At this time, the amount of water to be changed is required to be 50% to 100%, the amount of aeration is increased to 2%, and the light gradually transitions to natural light. The water color of the pond is required to be lighter, but there must still be a certain number of monocytic algae with a density of 30,000 to 50,000 algae per milliliter. The daily feed is 10 to 16 grams of crab meat and shrimp meat per ton of water, with 40 objects. Sieve filtration, and then use a 120-mesh sieve to filter out the smaller particles of feed. Under water conditions of 25 to 30°C and salinity of 22 to 26°C, after 8 to 10 days of incubation, the body can grow up to 0.7 cm or more.
The nauplii rely on its own body yolk as a nutrient, and it should fertilize the breeding alveolar algae according to the biological condition of the feed in the pond for feeding after the larvae metamorphose. The pool water requires a depth of 40 to 70 cm. The amount of fertilizer applied is 2 g of nitrogen fertilizer and 0.2 g of phosphate fertilizer per ton of water. The water color is preferably yellow-green. The nauplii are most afraid of direct sunlight. The illuminance should be controlled within 1,000 lux and the aeration volume should be around 1%. In the case of water temperature of 25-28°C and salinity of 22 ‰-26 ,, the nauplii develop metamorphosis to zoea in 2 to 3 days.
2. The larvae of the zoea are bred by the somatic segmentation of the zoea larvae. There are obvious red pigments around the breastplate, tailbone, and ocular handles. The complete mouthparts and digestive organs will appear. They will ingest phytoplankton, and they will also feed on plankton during the later period. Animals, do "butterfly swimming" campaign. The warty larvae had three times of molting, gradually appearing compound eyes, frontal horns, and tail limbs. The tail section was enlarged and the tail was exposed.
The gravid larvae began feeding, and the density of the monocytic algae should be controlled between 150,000 and 200,000/ml. The water color should be yellowish-brown and later tea brown. The first stage of juvenile zoea can be properly fed with yeast and soya milk every day, and 3-6 grams per ton of water will be fed 4-6 times. For the second period of feeding larvae can be fed egg yolk and a small amount of crab paste, crab meat, with a 150-mesh sieve filter, the daily amount of 4 to 10 grams per ton of water. The amount of animal feed fed to the third stage of zoea larvae was slightly increased and filtered through a 120 mesh sieve. Every day, add 15 to 20 centimeters of water. After filling the water, change the water every day by 15 to 20 centimeters. The inflation rate is slightly more 1%, and the illuminance is controlled within 1,500 lux. At the temperature of 25-30°C and the salinity of 22 ‰ to 26 蚤, the sickling larvae develop metamorphosis to larval prawn after 3 to 4 days.
3, the cultivation of shrimp larvae The larvae of the larvae are thin and small, and the cephalothorax and the abdomen are distinctly bordered. The appendages of various parts are complete and begin to take the shape of shrimp. Feeding plankton, mainly zooplankton, molting 3 times, divided into 3 phases.
The food intake of the larval rearing prawn increased, but the predation ability was poor, and almost no Artemia larvae could be fed (this is different from the prawn and shrimp). At this time, the water color is light brown, the density of monocytic algae is 50,000 to 100,000 per milliliter, the illumination is controlled within 3,000 lux, the amount of water per day is 1/3 to 1/2, and the aeration rate is increased to 1.5%. Under water temperature of 25-30 °C and salinity of 22 ‰ to 26 ‰, the prawn developed metamorphosis to prawn after 4 to 5 days.
4. Cultivation of young prawn New prawn prawn has serrations on the upper edge of the forehead and no teeth on the lower edge. The appendages are short, the whip is long, there are red and white stripes, and there are many gray spots on the body. Prawns swim horizontally, attached to the wall, have latent habits, and have poor mobility. Dietary complexity of young shrimp, especially benthic diatoms at the bottom of the pool is preferred. At this time, the amount of water to be changed is required to be 50% to 100%, the amount of aeration is increased to 2%, and the light gradually transitions to natural light. The water color of the pond is required to be lighter, but there must still be a certain number of monocytic algae with a density of 30,000 to 50,000 algae per milliliter. The daily feed is 10 to 16 grams of crab meat and shrimp meat per ton of water, with 40 objects. Sieve filtration, and then use a 120-mesh sieve to filter out the smaller particles of feed. Under water conditions of 25 to 30°C and salinity of 22 to 26°C, after 8 to 10 days of incubation, the body can grow up to 0.7 cm or more.
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