Is it more cloudy or sunny?

There are more spearfish on sunny days.

Spearfishing is a fishing method that uses a harpoon with an iron prong attached to a long bamboo pole. In calm weather, the harpoon is aimed directly at the fish head. In sunny weather, the deviation caused by sunlight refraction needs to be corrected. Fish spearing requires fish to hide at the bottom of the river. There are more and bigger fish in the deep river bottom. On a sunny day, the sunlight can penetrate the water surface, helping fish spearmen to locate the fish more accurately and improve the success rate of spearing fish.