Cysts production of Artemia salina in salt ponds in Thailand
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Techniques for culturing aquatic animals in freshwater, brackishwater and salt water have been improving rapidly. The feed for aquatic animals such as fish, shrimp, crab, etc. during their larval stages is therefore of vital importance. Up to now, the feeds used are planktonic plants and animals, e.g., diatoms, rotifiers, copepods, etc. which are reared in the hatchery or collected from natural breeding grounds. These practices are greatly handicapped by difficulties in obtaining sufficient quan tities of these foods. Artemia salina is one of the most important feeds. It has to be imported in large quantities from abroad. It is imported as dry Artemia cysts, preserved in vacuum packed tins in such a way that they will last for years. Subsequently, these cysts can be hatched whenever deemed necessary in the required quantity. However, the cost of imported cysts is extremely high. An experimental, research, training and development project for freshwater prawn culture at the Chacheongsa o Fisheries Station has been in operation for over 3 years. This project requires an enormous quantity of Artemia for its work. The Station has developed methods of utilizing Artemia to the fullest by conducting research in techniques for its preservation and establishing technical procedures for a new local Artemia rearing industry to replace the necessity of importing cysts. This report will deal briefly with the value of Artemia production and includes the techniques used and results of exp eriments on cyst production in Thai salt ponds.