My experience in fly fishing would say yes. Fish are generally nervous when the conditions are calm and the water surface quiet, because the birds such as osprey (predators) can clearly see them. During a rainstorm, the surface is broken up and visibility is reduced. Also there is generally an increase in food nearer the surface, such as a hatch occurring resulting in nymphs, stoneflies, mayflies, etc. This can result in fish that wouldn’t normally go near the surface in bright skies, go and hit that buffet near the surface. Now the rain backs off, the fish may still stay near the surface to continue to feed for a period of time. I can easily see an early bird osprey or eagle having their choice of fish to choose from.