The Culture technique of mantis shrimp

People in different regions of China have different names for mantis shrimp, such as: mantis shrimp, shrimp crawling seed, climbing shrimp, shrimp tiger, belt shrimp, shrimp po, shrimp male, mantis shrimp, urinating shrimp, urinating shrimp, shrimp dog bomb, bullet shrimp, rich shrimp, pipa shrimp, flower bug, shrimp skin bomb worm, silkworm shrimp, shrimp busai, water scorpion, mantis shrimp. In Penglai Dajijia and other places, it is also called "official hat shrimp" because its tail looks like black gauze hat upside down.

Daily management of mantis shrimp

During incubation, pond patrol is necessary to check water intake and discharge, oratosquilla activity and feeding, water quality, especially larval discharge. Once the parent shrimp is found to discharge pseudoflea larvae, the larvae are collected into the nursery pond for breeding.

The breeding of parent mantis shrimp refers to the breeding process of female mantis shrimp with mature ovary or immature ovary in special breeding pond, so as to make its gonad mature, lay eggs and incubate eggs until pseudoflea larvae hatch. The maturation promotion culture and egg incubation are carried out in a culture pond, and the culture pond has suitable environmental conditions for the oratosquilla, so the maturation promotion effect is good, the egg incubation rate is high, and the incubation rate is also high.

The purpose of parent culture is to synchronize ovary development, lay eggs and larvae neatly, and obtain a large number of pseudoflea larvae to form a certain production scale. There are two kinds of culture ponds for parent crayfish, one is indoor pond and only one is outdoor pond. Indoor pool is generally cement pool, outdoor pool is soil pool. Special attention should be paid to water quality management, food management and daily management in parent crayfish cultivation.

water quality management

The dissolved oxygen in the water body is kept above 5ml/L, the daily water change is 1/4~1/3, and the transparency is 30~50 cm. Oratosquilla is a kind of temperature-changeable crustacean, whose growth and life activities are directly affected by environmental temperature. The water temperature in its living area is roughly 6~31℃, and the optimum temperature is 20~27℃, belonging to the eurythermal species.

Under laboratory conditions, the oratosquilla directly moved from 17℃ to 5℃ seawater, the body immediately arched, slowly straightened after coma. Move it into seawater at 33℃, mantis oratoria first up and down, then side down at the bottom, only swimming limbs can swing, 3 minutes after coma. Therefore, it is considered that its temperature tolerance range is 5~33℃.

In case of water temperature change, the temperature range will increase. Parental crayfish cultivation, special attention should be paid to temperature difference, generally speaking, cultivation, water temperature control at 20~30℃. Water temperature is an inhibiting factor for gonad development of oratosquilla. The higher the water temperature, the faster the gonad development. If the summer temperature is too high, you can increase the water level to prevent the water temperature is too high and affect the parent squilla eggs, hatching, and even cause death. At 25~30℃, it takes 7~15 days for eggs to hatch from fertilization.

Feed management

Oratosquilla can feed on fish, shrimp and shellfish, but it is better to eat fresh small shellfish to avoid polluting water quality. Bait to small pieces as well, to evenly scattered cast, in order to feed, well to improve food consumption half and reduce mutual killing due to food rush.

According to the characteristics of day and night emergence of oratosquilla, feed once a day in the evening, feed amount is 5%~20% of the weight of parent crayfish, and appropriately increase or decrease with the egg holding condition of parent crayfish, water temperature, weather condition, feed type and quality condition.

In the early stage of cultivation, the feeding amount can be increased appropriately to meet the nutritional requirements of adequate gonad development. Parent squilla burrows when holding eggs and basically does not feed, so it is estimated that most parent squilla should reduce the feeding amount when holding eggs. In addition, parent crayfish hatching, into growth, food intake increased, but also interfere with other eggs crayfish, so the best land cage net trap out of the pool.

Selection and transportation of mantis shrimp

Parent squilla can choose artificially cultured or mated female squilla in natural sea area.

Although the body length can be reproduced above 8 cm, in order to ensure the quality and improve the number of eggs, it is advisable to choose a body length of more than 11 cm and a weight of more than 30 g. In addition, when acquiring parent crayfish, we should pay attention to the short time out of water, good gonad development, strong body, complete appendages, no scars, strong vitality, bright body color, sensitive to external stimuli. The parent crayfish should be transported to the nursery plant as soon as possible after acquisition, and put into the pond for temporary cultivation.

Transportation methods include live water ship transportation, nylon bag oxygenated transportation, dry moisture transportation and canvas bucket with water transportation. The parent crayfish is first bathed in 200×10 mL formaldehyde for 3 minutes, then the active and complete appendages are put into a cement pool (9 m ×4 m ×1.2 m) which has been disinfected in advance, and filtered fresh seawater is added for aeration to restore vitality and temporary cultivation. The temperature of parent crayfish in the temporary culture pond should be 1~2℃ higher than that in the sea area 1~3 days before. If the temperature rises too fast and too high, it is easy to make parent crayfish premature or abort.

After 20~30 days, the temperature was raised to 21~22℃ at the rate of 0.5~1.0℃/day, and a small amount of fresh nereis, shrimp and variegated clam meat were fed to further fatten the gonads.

Although the female basically stops feeding and the stomach is almost empty during the reproductive season, when the gonad coefficient reaches more than 14% at 22℃, the eggs in the egg mass are clear and basically in mass shape, that is, mature eggs.

I think everyone is very familiar with mantis shrimp. There are also many people who like to eat mantis shrimp in life. Compared with lobster, mantis shrimp has more meat and is more delicious. Therefore, mantis shrimp lives in the sea and is generally more common in the north.