No fishing in March, no bird hunting for several months.

"March" in this sentence refers to the whole spring. There is also a folk saying that "don't hit three spring birds". Sanchun refers to Meng Chun, Zhongchun and Ji Chun.

Spring blossoms, birds and flowers are fragrant, which is the most active season for migratory birds. Bird migration needs to find a mate, build a nest, mate, hatch and brood when it comes to the breeding ground, which is a critical period for bird breeding. If they are killed at this time, the number of birds will drop sharply, which will do harm to the survival and reproduction of bird populations.

There is also a folk saying that "no fishing in March, no bird catching in March", and spring is also a very important period for fish. That's why there is such a statement.