-
Detailed Explanation of the Latest Key Points on Soft-Shelled Turtle Hatchling Farming Techniques
In recent years, hatchling soft-shelled turtles have frequently appeared on our dining tables. Compared with the previous recipes using a whole soft-shelled turtle, hatchling soft-shelled turtles are more appealing to consumers - one per person, and they taste even better. As consumer demand for hatchling soft-shelled turtles rises,
-
How to Raise Mantis Shrimp? Master These Farming Techniques
The official name of the mantis shrimp in mainland China is "squilla." The squilla is fierce in temperament and has very sharp eyesight. It feeds on meat, preying on small invertebrates. The mantis shrimp is a seafood product rich in nutrients, with fresh juice and tender meat. Let's learn about it together with the editor below. ⟦4 <p>The official name of the mantis shrimp in mainland China is “squilla&rdquo. The squilla is fierce in temperament and has very sharp eyesight. It feeds on meat, preying on small invertebrates. The mantis shrimp is a seafood product rich in nutrients, with fresh juice and tender meat. Let's learn about the farming techniques for mantis shrimp together with the editor below.</p><p></p><p><strong>Mantis Shrimp Farming Techniques</strong></p><p>1. Water Quality Management</p><p>Keep the dissolved oxygen in the water body above 5ml/L, change 1/4 to 1/3 of the water daily, and maintain transparency at 30 to 50 cm. The squilla belongs to the temperature-changing fierce crustaceans, and its growth, development and life activities are directly affected by the ambient water temperature. The water temperature of its living area is roughly 6 to 31°C, with the optimum temperature at 20 to 27°C, so it belongs to the eurythermal species. Under laboratory conditions, when the squilla is moved directly from 17°C into 5°C seawater, its body immediately arches up, slowly straightens out and then goes into a coma. When it is moved into 33°C seawater, the squilla first darts up and down, then falls sideways at the bottom, with only the swimming legs able to move, and goes into a coma after 3 minutes. Therefore, its temperature tolerance range is considered to be 5 to 33°C. Under conditions of gradual temperature change, the temperature tolerance range will increase.</p><p>2. Bait Management</p><p>The squilla can feed on fish, shrimp and shellfish, but live small shellfish are best, as they can avoid polluting the water quality. Bait should be in small pieces and scattered evenly for feeding, so as to improve bait consumption and reduce mutual killing due to competition for food. According to the squilla's habit of hiding by day and coming out at night, feeding once every evening is sufficient, with the feeding amount at 5% to 20% of the weight of the parent squilla, and appropriately increased or decreased according to the egg-carrying situation of the parent squilla, water temperature, weather conditions, and the type and quality of bait. In the early stage of cultivation, the feeding amount can be appropriately increased to provide sufficient nutrition for gonadal development. The parent squilla burrows when carrying eggs and basically does not feed, so when most parent squillas are estimated to be carrying eggs, the feeding amount should be reduced. In addition, after the parent squilla hatches its young, it shifts to growth, its food intake greatly increases, and it also disturbs other egg-carrying squillas, so it is best to trap them out of the pond with cage nets and the like.</p><p></p><p>3. Daily Management</p><p>During the cultivation period, patrolling the pond is essential work: checking the water intake and drainage, the activity and feeding of the squilla, and the water quality, especially the release of larvae. Once it is found that the parent squilla has released pseudozoea larvae, the larvae are immediately collected into the nursery pond for rearing.</p><p>4. Hatching</p><p>The spawning and reproduction of the squilla have strict requirements for environmental conditions, especially the substrate, burrows and light. Without suitable conditions, it will not spawn, or even if it spawns, it will not hatch. Therefore, soft mud collected from the intertidal zone (20 to 30 cm thick) should be placed at the bottom of a fiberglass round tank (diameter 2 m × 1.0), spread flat, seawater added to 30 cm above the mud surface, soaked with sodium hypochlorite for 24 hours for disinfection, then neutralized and washed, and the pH value of the seawater in the tank made consistent with that of filtered seawater, then covered with black cloth for later use.</p><p>Select 16 parent squillas that are large, lively and have complete appendages with mature gonadal development (gonadal coefficient above 15%), disinfect them with formaldehyde, and then place them into the above hatching tank. The squilla has a very strong ability to dig burrows. As long as the substrate and environmental conditions are suitable, sexually mature parent squillas can complete the construction of a “u”-shaped burrow in a very short time, and it has two openings, one large and one small, with the large opening 5 to 7 cm in diameter and the small opening about 2 cm in diameter. When the water temperature is raised to 24 to 25°C, the parent squilla begins to spawn and carry eggs inside the burrow.</p><p>The egg mass produced by the squilla is yellow, with a diameter of 1.5 to 3 cm. The mature egg cells are round, about 410 to 450 microns in diameter, released all at once, and held at the mouth with the maxillipeds and constantly rotated. As long as the egg mass is not broken or stimulated by the outside, it will be held continuously, from a few hours to several days. If there is external stimulation such as strong light, rapid flowing water, or a large water temperature difference, the egg mass will be quickly thrown off. The cleavage form of the fertilized egg of the squilla is superficial cleavage. Under a water temperature of 26 to 28°C, after about 20 days of flowing-water incubation, it is cultivated to the squilla pseudozoea larva (that is, the squilla larva). During this period, the water flow should be controlled so as not to stir up and cloud the tank. The outflow and inflow should be equal, and water should be changed with 100-mesh silk. The dissolved oxygen content in the tank should be greater than 5 mg/L. Spawning, hatching and the larvae are all completed together with the mother in the burrow. When the larvae leave the burrow and the mother and float in the water, they are the metamorphosed squilla larvae. It takes 3 to 4 months for the squilla larva to metamorphose into a juvenile squilla. At this time, the larvae should be separated from the original cultivation tank.</p><p></p><p><strong>Breeding Techniques for Mantis Shrimp Farming</strong></p><p>The spawning period of the mantis shrimp is from April to September, with June to July being the peak season. In the peak season, egg-carrying shrimp account for about 73% to 87% of the total number of female shrimp. Mating of the mantis shrimp occurs just before spawning. The female shrimp molts first, and at this time the male shrimp follows to mate. After mating, spawning usually occurs within 24 hours, mostly at night.</p><p>In the same reproductive period, the mantis shrimp can spawn 2 to 3 times consecutively. When the eggs from the first spawning hatch, eggs again enter the mature stage, followed by molting, mating and a second spawning. The interval between the two spawnings is 20 to 25 days. Shrimp of the current year generally do not mature and spawn; shrimp of the following year are mostly 4 to 6 cm in body length, with a brood amount generally of 600 to 5,000 eggs.</p><p></p><p><strong>Reproductive Habits of the Mantis Shrimp</strong></p><p>The mantis shrimp lives in water layers 5-60 m deep, and prefers to inhabit U-shaped burrows in shallow-sea mud bottoms or crevices in gravel and reefs. It is dioecious, but male and female mantis shrimp are relatively similar in appearance; the difference is that the male is slightly larger, and the last pair of walking legs on the chest is differently shaped between male and female. The male's second maxilliped is thick and strong, and on the inner side of the base of the last pair of walking legs on the chest there is a pair of rod-shaped copulatory organs, and in very rare cases the 7th thoracic limb also has one copulatory organ. The female has none.</p><p>During the reproductive period, a white “”-shaped gelatinous gland appears on the ventral surface of the 6th—8th thoracic segments of the female. It reaches sexual maturity at 1 year of age. Most scholars believe mating occurs in September—November before the female mantis shrimp molts; some believe it is just before spawning; others believe mating has already occurred several months before spawning. Generally mating occurs once, though a second mating also occurs from time to time.</p><p>Its reproductive period is April—September, with the peak in May-July. In the reproductive season, the 4th thoracic segment to the tail segment of the ovary is yellow-brown, with melanin distributed on the dorsal side, and the pigment is more concentrated on the midline of the body axis. At the 5th and 6th segments the ovary is thickest, and at the tail segment it expands, filling the tail segment and appearing fan-shaped. The testis is milky white. The mantis shrimp has an average spawning amount of 30,000—50,000 eggs, with a maximum of 200,000 eggs. The spawning amount is related to its carapace length. According to reports, the biological minimum size at first sexual maturity of the mantis shrimp is about 80 mm. The ovarian development of the mantis shrimp is asynchronous, so seedling rearing can be carried out multiple times during its reproductive season.</p><p></p><p><strong>Nutritional Value of the Mantis Shrimp</strong></p><p>The squilla, the attacking appendage of various stomatopod animals, is a seafood product rich in nutrients, with fresh juice and tender meat. Its meat contains relatively more water, and the meat tastes fresh, sweet, and smooth, light and soft, and has a special attractive umami flavor. Every spring is its spawning season, and eating it at this time is best. A plump squilla's head is full of roe and fat, the meat is very tender, and the taste is delicious, but unfortunately there is more shell and less meat.</p><p>However, its protein content is as high as 20%, fat 0.7%, as well as vitamins, inosinic acid, aminopropionic acid (the editor is advised to carefully consult the materials; alanine is one of the 20 natural amino acids and can serve as a nutritional component, but aminopropionic acid has a different structure from alanine, which would lead to different biochemical effects for them; please consider whether it can serve as a nutritional component, author) and other nutrients needed by the human body. The squilla is warm in nature and sweet in taste. It has the effects of tonifying the kidney and strengthening yang, promoting lactation and removing toxins.</p><p>According to measurements, the dry weight of the body of the squilla contains 72.12% protein, 7.88% fat, 7.91% ash, 0.38% calcium, and 2.21% phosphorus; the amino acid content is comprehensive, reasonably composed, and easy for the human body to digest and absorb, especially the content of essential amino acids such as lysine is relatively high, and it is rich in glutamic acid and glycine, so the taste when eaten is delicious.</p><p></p><p>The mantis shrimp is also a common seafood product on the market. Live mantis shrimp cannot live more than three hours once away from seawater. If you want to eat fresh mantis shrimp, remember to keep it fresh well.</p><p>The mantis shrimp is currently very popular in the domestic market. Farming mantis shrimp is a good entrepreneurial project, but the farming of mantis shrimp has very high requirements for the environment and technology, so farming mantis shrimp can only be carried out on the premise of first proficiently mastering the farming techniques. All farming carries risks, and everyone must study the market conditions well before deciding whether to farm.</p>
-
Detailed Explanation of Key Points for Polyculture Techniques of Rice Field Eels and Loaches
Polyculture of rice field eels and loaches - that's right, both rice field eels and loaches are something we often see, they can be polycultured together, and polyculture can produce greater benefits and higher yields. Below we discuss the polyculture techniques for rice field eels and loaches. Polyculture Techniques for Rice Field Eels and Loaches
-
Detailed Explanation of Key Points on Black King Kong Shrimp Breeding Techniques
Black King Kong shrimp generally refers to the Black King Kong crystal shrimp. If crystal shrimp are the nobility among shrimp, then Black King Kong shrimp are the nobility among crystal shrimp. Let's take a look at how the nobility among nobility are kept. Black King Kong shrimp breeding techniques. 1. Equipment: all use silent
-
How to farm mantis shrimp? Mastering these aquaculture techniques is key
Autumn weather is cool, and nighttime activity is in full swing, making it the perfect season for late-night snacks. For a foodie like me, it basically means late-night snacks going down every single night. Counting up these late-night snack varieties, the one I always have to order is shrimp. There are so many varieties of shrimp, and the cooking methods
-
How to Raise Centipedes? A Detailed Guide to Scientific Breeding Techniques
The centipede is a very aggressive animal, with relatively strong venom, and it crawls extremely fast. However, this highly venomous centipede also has relatively high utility value, and it can even be eaten, with good effects on certain related medical conditions. Below we explain
-
Key Technical Points and Detailed Methods for Greenhouse Farming of Cicadas
The cicada is a very common insect, and it is also a delicacy sought after by many people. Cicadas are especially rich in nutritional value, and the market demand for cicadas exceeds supply, which has given rise to cicada farming projects. Below, the editor will guide everyone through cicada farming; friends who want to farm cicadas
-
How Are Earthworms Raised? A Detailed Explanation of Scientific Breeding Techniques
The earthworm is an annelid that likes to live in moist, dark soil. Recently, earthworm farming has also become an emerging industry. Earthworms have certain medicinal value and edible value, can also improve soil, and have high utilization value. Below, the editor gives everyone a popular science introduction
-
How to Raise Scorpions? A Detailed Guide to Scientific Breeding Techniques
The scorpion is a venomous animal that likes to live in dark, damp places. Despite being venomous, the scorpion is an animal with high nutritional value and a wide range of uses. That is why more and more people are raising scorpions. Below, the editor will introduce
-
A Detailed Explanation of Porcupine Farming Techniques and Management Methods
The whole body of the porcupine is a treasure; both its meat and its quills can generate profit, making it a highly valuable animal. Because porcupine profits are so high, the porcupine farming industry has gradually become an emerging industry in our country. The editor has compiled some knowledge on porcupine farming techniques to share here
条件筛选