"Four men died at the scene and four more, also males, died in a hospital during treatment," Joaquin Carrillo Ruiz, chief prosecutor of Oaxaca state, told AFP.
The victims were all fishermen who caught sharks, but the prosecutor`s office said in a statement that investigators were looking at whether they were involved in other activities at sea.
It did not give more details about the investigation. but drugs are moved off the coasts of southern Mexico.
Authorities had earlier confirmed seven fatalities but the eighth victim succumbed to his wounds on Tuesday.
Puerto Escondido is a popular tourist destination and is beloved by surfers worldwide.
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