Are snakeheads poisonous

if you mean by sea snakes, than yes. in fact, sea snakes are the most venomous type of snake in the world. the 10 most toxic sea snakes are the belchers sea snake( world's most venomous snake 100 times more venomous than the common taipan) banded sea snake, yellow bellied sea snake, Dubois's Reef sea snake, stoke sea snake, olive sea snake, elegant sea snake, electic sea snake, Fiji sea snake