NSArray *images=  [NSArray 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];
    int currentImageIndex=0;
    
    [UIView animateWithDuration:2.0 delay:0.0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
        [self.first_fish setImage:[images objectAtIndex:currentImageIndex] ];
    }completion:Nil ];