Australian Gemstone Nursery Notice
To ensure that the Australian gems, the first larvae of Australian gem larvae have small cracks when they open their mouths, and they cannot eat rotifers. If they cannot feed the first larvae manually, the larvae that did not feed in time will not be able to feed the yolk sac. After absorption, it did not die at the time, but because of lack of nutrition, the vitality gradually weakened and the survival rate was very low. Therefore, timely supplementation of the first food is the key to improving the survival rate of nursery. The current practice is to use oyster fertilized eggs, sea urchin eggs, oyster larvae, or unfertilized germ cells as open bait. Although unfertilized germ cells have the disadvantage of easily contaminating water quality, they are convenient to use, easy to obtain, and nutrient-rich. As long as the control is good, the larvae can smoothly pass through the opening period and enter the stage of feeding rotifers. The specific approach is: larvae in the first two or three days of feeding shellfish eggs or sea urchin eggs, 4 times a day, each time a cubic meter of water per cubic meter of nursery water, spilled the whole pool evenly, and feeding a small amount of larvae on the second day of opening The rotifers gradually transitioned to feeding rotifers. To control the temperature of hatching water and the temperature of the early nursery, it is necessary to ensure that the temperature of the hatching water and the water temperature of the early nursery are moderate. When the water temperature is high, the metabolic consumption of larvae is too fast and exogenous nutrition cannot keep up; when the water temperature is low, the larvae feed slowly and affect their growth. Keep the water fresh In the nursery process, the filamentous algae at the bottom of the pool and at the poolside should be promptly removed to keep the water fresh. If there is too much suspended matter in the water, then the particulate matter in the water adheres to the larvae, which can also weaken the vitality and even cause the death of the fry. Do not turn on lights at night In the late stage of larvae, fish have grown long back spines and ventral spines, internal organs have been further developed, and their external morphology has also undergone major changes. At this time, Australian gemstones have phototaxis. If lights are turned on at night at the nursery pool, they will cluster together due to their phototaxis, resulting in excessive concentration and suffocation. Timely adjustment of the salinity of nursery water When Australian gems develop into late larvae, the salinity of nursery water can be gradually reduced to about 5, without adverse effects on fish; on the other hand, the nursery requires a larger amount of rotifers, copepods At times, rotifers and copepods reproduce better under conditions of lower salinity. If the biological feed derived from a lower salinity water body is fed to a nursery pond with a salinity of 30-33, the bait organism quickly sinks to the bottom and most of them die. In this case, the salinity of the nursery water is gradually reduced, so that it can be adapted to the growth environment of the bio-feed, so that a better seeding effect can be obtained. To prevent the Australian gemstones from juvenile fisheries from staggering each other. After entering the juvenile period, the phenomenon of Australian gemstones encroaching on each other is quite serious. Mutual encroachment has a great influence on the survival rate of seedlings. This is the habit of gemstones and it is difficult to change. Under normal circumstances, the feeding of chironomid larvae at the most serious stage of gems in Australia will reduce the phenomenon of encroaching on each other because this stage mainly feeds on copepods or frozen meat worms, and the size of copepods is not very large. For the caliber of fish, you need to find some foods that are slightly larger, and frozen meat worms are dead baits and cannot be fed all day long. After feeding the chironomid larvae, the fish can ingest palatability food at any time, and the encroachment will be reduced accordingly. The phenomenon of encroaching on each other after the fish grows to 5 cm will naturally decrease. The prudent use of Australian gem eel fry is very sensitive to trichlorfon, copper sulphate, and ferrous sulphate. Be cautious when using drugs to avoid adverse consequences. Industrial Applications Nitrile Gloves Industrial Applications Nitrile Gloves,Industrial Nitrile Gloves,Food Grade Disposable Gloves,Food Grade Nitrile Gloves Puyang Linshi Medical Supplies Co., Ltd. , https://www.linshimedicals.com