This is fried peacock eels, in the west this is a fish for the aquarium, it has pretty coloured spots on it's tail, but in Thailand, it's just another small fish. We like to dry it out in the sunshine, and fry it off. It has some sharp spines on back, but these become brittle once you hard fry it.
Below is a picture of the raw fish, spread them out on a tray, put them out in the sun, I have a net to cover them, otherwise the flies get to them. Once they're dry, after a day or two, drop them into hot oil for a few minutes till brown and crispy. They're a crunchy snack for serving with beer, you eat them whole, with perhaps a nice hot chilli dipping sauce on the side for a bit of bite.