Delgado,
I agree with the others, I too think it is from lack of O2. the bump wasn't caused from lack of O2 but like alfon said it could have happened after death. Possbily a sort of bloating like most dead bodies do after death. Since the heat is the trigger decomposition is sped up in the prcoess.
Even if the river has the same temperature as a tank it doesn't mean that the amount of disolved oxygen is the same. Tige come from fast moving waters with lots of turbulence and that helps increase the disolved oxyegn in the water.
Sorry but I agree with armac on this one. Before you give firm wrong advices please do a bit more research first.
I agree with the others, I too think it is from lack of O2. the bump wasn't caused from lack of O2 but like alfon said it could have happened after death. Possbily a sort of bloating like most dead bodies do after death. Since the heat is the trigger decomposition is sped up in the prcoess.
Even if the river has the same temperature as a tank it doesn't mean that the amount of disolved oxygen is the same. Tige come from fast moving waters with lots of turbulence and that helps increase the disolved oxyegn in the water.
Sorry but I agree with armac on this one. Before you give firm wrong advices please do a bit more research first.