about the worm inside the fish

[Yidiandian]

Last year, I caught few fish, there were some white spot allover the fish's body, inside and outside, some of them size like the dry green beans. the canadian told me they are the worms. if you cook the fish they become harder like little stones.(I tried, he is right)

I just wonder, if nothing you can see such as the white spot, does the fish still have any worms?

The canadians just told me to rent a boat go fishing in side the lake, the water will be cooler, because the water beside the shore is too warm, easliy to have the worms.

Is that right?

 

[Pigeon]

I have similar experience. When I cut and open the egg, I can see a worm is moving.

 

[nov_free]

I found a lot of this "stone" in China

But I didn't find a single one here. I thought it was some kind of "Jie Shi" of fish.