Why is it difficult to fish in Hainan in March and April?

Affected by temperature and air pressure.

In March and April in Hainan, the temperature is unstable, the air pressure is low, the temperature is high and low, and the fish can't adapt and won't take the bait.

Whether a fish is good or not depends on the solar terms and the target fish. To sum up, around the vernal equinox, around the autumnal equinox, the temperature is the most suitable time period, and it is the peak season of fishing season in spring and autumn.