Diadema Fish, Pseudochromis diadema Culture in Closed Water Circulation System

Abstract

               This research study was to study methods of cultivating ornamental marine fish species, Diadema, Pseudochromis diadema which are not cultivated. Therefore, they are raised in a closed water circulation system at the Institute of Marine Science, Burapha University. The information obtained is collected during routine work (2022) to find a way to breed them to survive and can be used as a baseline for further research studies in the future. The results of the study revealed that the parent fish had a total length of between 2-2.3 inches and lived in pairs in the hiding place laying a bunch of eggs in a tube The number of eggs is between 450-3,500 (n=3). The incubation period is 3 days after the laying date. Ovulation frequency every 5-14 days (n=10) (water temperature 25-29 °C, water salinity 30-34 ppt, pH 7.8-8.0, alkalinity 95-110 mg/L). The hatchlings range from 2-3 mm (n=10) to feed and feed from hatching to 8 days, fed nursery with rotifers Brachionus rotundiformis, 45-50 µm, density 10 ind./ml, age 7-18 days. The rotifers of 45-120 µm were mixed with primordial newly hatching Artemia sp. at a density of 15 ind./ml and 1 ind./ml respectively, Aged 18days - Metamorphosis, newly hatching Artemia sp., density 2 ind./ml During nursery, cultures were mixed with phytoplankton (Nannochloropsis oculata and Isochrysis galbana) at 50,000 cells/ml density throughout the experiment. At the age of 33 days, the larvae have a changes in morphology and behavior (Metamorphosis).Keywords :  Pseudochromis diadema; Culture ; Ornamental fish