Summary

Ernest Young Peeps at Many Lands: Siam — Chapter 13 Fishing (1908)

The reason for the commandment is that, as we have already explained, when a person dies, his soul is reborn again in another body, and this body may possibly be that of some animal. Hence, if you kill a mosquito, you may possibly be killing your own or some one else's long-deceased relative. The rule about not taking life is very generally observed, but is neglected in the case of fish. The Siamese excuses himself for fishing, on the ground that he does not kill the fish. He only pulls them out of the water; they die a natural death.
Source: Wikisource

Ernest Young Peeps at Many Lands: Siam — Chapter 13 Fishing (1908)

In Lower Siam fish forms an important part of the food of the people. In Upper Siam it is looked upon as a great luxury, for the rivers in the north are singularly poor in animal life. The absence of fish in the streams of Upper Siam is probably due to the fact that in the dry season the water is too shallow to allow the fish to live, and that in the wet season the current, swollen by the heavy rains, is extremely rapid, and drives them down-stream.
Source: Wikisource

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