A Overview of the wild type single tail and double tail mutant fighting fish. B Skeleton staining shows the numbers of fin rays of both dorsal fin and caudal fin are significantly higher in double tail than in single tail. C Vista plotting of the genomic locus for double tail mutation among zebrafish, combating fish, and medaka. Zebrafish is used as reference. 006008 of double tail allele. D PCR screening of the deletion in single tail and double tail fish. It also is challenging to totally prove the suppression of the competitive behaviors during this species of fish, i. e. the antiaggressive action of sertraline. That action is obvious as in comparison to the control in our own investigated group. Comparing it with the process aggression in the manage group during 2 weeks of the experiment and 4 weeks after its ending those activities are not so obtrusive. Similarly as other authors , it was noted in the research that during the handle group the aggression of animals higher until the 14th day of the test and then spontaneously but considerably subsided as to the number of assaults.