The moulting problem of larvae may be encountered during rearing, but usually occurs during the large postlarvae stage and may include the larvae being unable to get out of the old corpse, stain and other deformation contaminants.
Moulting is a common feature of larval rearing, any imbalance in the culture medium, the health of the larvae, or the increase of pathogens can all influence the moulting process. larval.
All recommendations for the prevention and treatment of Vibrio should also be used to support moulting.
Initiation of the ArtPost, which has been shelled, sterilized and frozen prior to Mysis 1 to Postlarvae1, has been started to ensure that Mysis larvae have adequate nutrition to overcome the molting stage of Mysis 3 through Postlarvae1. The usual procedure at some hatcheries in Bangladeshi is to just start fresh Artemia supplies from Postlarvae1 onwards. This may not provide for healthy larvae to overcome the stress-strain stage from Mysis to Postlarvae.
Remove and disinfect Artemia to try to reduce bacterial contamination from Artemia, which is a major source of microbial contamination in the hatchery.
Frozen NauPostlarvaeii Artemia (hatched each) for 24 hours to ensure that they are dead; otherwise, Mysis larvae may not catch them. Artemia balance, if still alive, then grows in larval rearing tanks and causes problems by eating algae, interfering with the larval growth.
Unbalanced pH and not enough alkalinity in water (especially in early larval stage) can cause molting. This is particularly serious when hatcheries are entering fresh water during the rainy season. At these times, it is necessary to maintain a pH of 8.2 – 8.4 through the addition of lime (Ca (OH) 2 or CaCO3), and maintain the alkalinity at> 150ppm (preferably 150-170ppm) Sodium Bicarbonate (NaHCO3)
Make sure that the water temperature is maintained continuously and within the optimum limits by using a heat pump and covering the tank to prevent the temperature drop causing the milling problem.
Make sure that the larvae are well nourished, especially with HUFAs (2g / kg), Lecithin PC (1-2%), cholesterol (0.1%), astaxanthin (0.1g / kg) and vitamin Ppm).
Heavy metals must be removed by using EDTA from 10-30 ppm / day depending on severity.
Add some molten stimulants, such as copper sulphate or iodine (1-2 ppm per day), but minimize the use of unnecessary chemicals that can stress the larvae.
Low quality (and malformed) larvae are remo