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Fluctuating asymmetry of bilateral meristic characteristic is one of the simple methods that can be used to determine the stability of an individual fish development. This study aims to provide quantitative information about the level of asymmetry of red tilapia (Oreochromis niloticus) in Genteng Fish Hatchery Center through bilateral meristic characteristic observation. A total of 100 fish samples (5-7 cm) were measured in this study. Three bilateral meristic characters were calculated i.e. number of soft pectoral fins, number of soft ventral fins, and number of scales on the lateral line. The results show that the highest value of the fluctuating asymmetry of magnitude (FAm) and fluctuating asymmetry of number (FAn) were obtained at the number of scales on the lateral line those are 3.71 and 0.86, respectively. Furthermore, on soft pectoral fins, the FAm value obtained was 1.29 and the FAn value was 0.58. Meanwhile, the lowest FAm and FAn values obtained from the soft ventral fins which were 0.93 and 0.50, respectively. The sum of the total value of fluctuating asymmetry of each bilateral meristic characteristic was observed. The overall FAm value was 5.93 and the overall FAn value was 1.94.

Asymmetric fluctuations function as a measure of organ stability in pairs in an individual. This study aims to determine the value of asymmetric fluctuations in hybrid grouper hybrid fish from Situbondo and Bali. The study was conducted for 3 months, starting from July-September 2018. The grouper used in this study was 100 individuals from each region, with a size of 7-9 cm. Bilateral meristic characters measured include the pectoral fin, ventral fin and lateral line. The results showed that the ventral fin character of the grouper fish from Situbondo and Bali had a higher FA value of 0.6-0.7, while the lateral linea organ had a higher FAm value, 1.1 to 1.9. The FAgb value of the grouper originating from Situbondo has a high value compared to the grouper from Bali, which is 1.5-2.4.