Paste code

-(void)animation_left{
    

    [UIView animateWithDuration:10.0 delay:1.0 options:UIViewAnimationOptionAllowUserInteraction animations:^(void){
        [self.first_fish setFrame:CGRectMake(-70, self.first_fish.frame.origin.y, self.first_fish.frame.size
                                             .width, self.first_fish.frame.size.height)];
        [self.first_fish setTransform:CGAffineTransformMakeScale(-1, 1)]; // flip horizontally
         self.first_fish.animati arrayWithObjects:[UIImage imageNamed:@"fish_right1"],
                                         [UIImage imageNamed:@"fish_right2"], [UIImage imageNamed:@"fish_right3"], [UIImage imageNamed:@"fish_right4"], [UIImage imageNamed:@"fish_right14"], [UIImage imageNamed:@"fish_right15"], [UIImage imageNamed:@"fish_right20"], nil];
         
         self.first_fish.animati
        [self.first_fish startAnimating];
        
    }completion:^(BOOL finished){
        [self.first_fish setTransform:CGAffineTransformIdentity];
        [self.first_fish setImage:[UIImage imageNamed:@"fish_right1"]];
        [self animation_right];
    }];
}

-(void)animation_right{
    
    [UIView animateWithDuration:10.0 delay:1.0 options:UIViewAnimationOptionAllowUserInteraction animations:^(void){
        [self.first_fish setFrame:CGRectMake(330, self.first_fish.frame.origin.y, self.first_fish.frame.size
                                             .width, self.first_fish.frame.size.height)];
         self.first_fish.animati arrayWithObjects:[UIImage imageNamed:@"fish_right1"],
                                         [UIImage imageNamed:@"fish_right2"], [UIImage imageNamed:@"fish_right3"], [UIImage imageNamed:@"fish_right4"], [UIImage imageNamed:@"fish_right14"], [UIImage imageNamed:@"fish_right15"], [UIImage imageNamed:@"fish_right20"], nil];
          self.first_fish.animati
        [self.first_fish startAnimating];
        
    }completion:^(BOOL finished){
         [self.first_fish setTransform:CGAffineTransformMakeScale(-1, 1)];
          [self.first_fish setImage:[UIImage imageNamed:@"fish_left1.png"]];
        [self animation_left];
    }];
}