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Second, the water conditions of pearl farming Water conditions of cultured pearls can be summarized as water depth, water flow, water pH, inorganic salt and food organisms.
1. The water depth of cultured pearls should be 1.5 meters to 3 meters deep.
2. The flow of water at a certain speed is of great significance to the growth of pearls and the cultivation of pearls. The spinnaker bream grows well in a well-ventilated river. Production practices have proven that pearl luster developed in flowing water is better than pearl luster developed in still water and yield is high.
3. Water quality Neutral pH water (PH7 ~ 7.5) is most suitable for the growth of pearl oysters and the secretion of nacre. Most freshwater waters have a pH of 6.5-8.5; hard waters tend to be alkaline. A pH above a certain limit will affect the growth and survival of the eel. If it is acidic, you can apply lime to water; if it is alkaline, you can apply organic fertilizer to change it.
4. Inorganic salt water is a very good solvent, dissolved in water in a variety of inorganic salts. These salts have a direct and indirect effect on the growth of pearls and the formation of pearls. Calcium is the main component of pearls, shells and pearls (present as calcium carbonate). Therefore, the breeding grounds for the eutrophication require a certain amount of calcium, which is generally more than 10 milligrams per liter.
In addition, magnesium, silicon, manganese, iron, etc. are all required to have a certain content.
5. The bait in the biological water is rich in food, and the nutrient rich in the pearl oysters grows well, so the pearl grows faster and the quality is higher. The main food organisms are phytoplankton and zooplankton. The spinnaker is mainly eaten with diatoms, and eats protozoa and organic detritus.
The amount of plankton and sediment in the water determines the color and transparency of the water body. From the depth of the water, you can estimate the amount of food organisms in the water. There are many food creatures with low transparency and deep water color. Yellow-green water is generally the most suitable for breeding pearls. The transparency of aquaculture waters is preferably 30 cm.
6. Light and ventilation light directly produce thermal effects, thus providing an energy source for the survival of the euplus and food organisms; light affects the physical and chemical properties of the water environment; light is of great significance to the color, reproduction, and behavior of the eupatorium. It is also good for rich pearls.
The wind fluctuates. The ventilated environment is rippling with water, which increases the dissolved oxygen in the water. It also promotes the movement of upper and lower water masses and the transfer of heat.
7. Water temperature has a close relationship with the metabolism of living things. The growth, development, reproduction, and distribution of the eubacterial oysters are directly affected and controlled by the water temperature. The formation and growth of pearls are also constrained by the temperature of the water. The tolerance range of the temperature of the larvae is three. Basic, but also of great ecological significance.
(1) The optimum temperature range is 15 degrees to 30 degrees: In this water temperature range, the growth and development of the pearl oysters are normal, the secretion of nacre is strong, and the pearl grows fast.
(2) The minimum temperature is below -10 degrees: below this temperature, the metabolism of the eubacterial eel is stagnant, its activities are weak, and the secretion of nacre basically stops.
(3) The maximum temperature is above 35 degrees: when the temperature exceeds 35 degrees, the growth of the eel is impeded, and the alienation in the metabolism is greater than the assimilation, resulting in the debilitation or death of the eel.
The bottom of the aquaculture waters should be used to produce vascular plants without water, because aquatic plants not only compete for inorganic salts with food organisms, but also produce toxic substances after the death of plants, affecting the growth of the nymphs.
How to choose pearl aquaculture waters
I. Types of Water Cultured by Pearls The water environment has a direct impact on the growth of pearls and the breeding of pearls. In general, pearls can be cultured in any area where fish can be raised.