-(void)animate : (CGFloat )duration {
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:duration];
    [UIView setAnimationCurve:UIViewAnimationCurveLinear];
    [UIView setAnimationBeginsFromCurrentState:YES];
    //[UIView setAnimationDelegate:self];
    [UIView setAnimationRepeatCount:2];
    [UIView setAnimationDidStopSelector:@selector(myCallback:finished:context:) ];
    CGRect frames =fishFall .frame;
    frames.origin = CGPointMake(100, 600);
    fishFall.frame = frames;
 //   NSLog(@"My view frame: %@", NSStringFromCGRect(frames));
    [UIView commitAnimations];
}

-(void)animateFromStart
{
[self.animate:1.5];
}