Are sea snakes poisonous in nature?

The sea snakes have evolved from terrestrial ancestors, most are extensively adapted to a fully aquatic life and are unable to move on land. Most of the sea snakes are poisonous in nature so good suggestion is to handle ever sea snakes with much caution. They can remain submerged for as long as a few hours, possibly depending on temperature and degree of activity. Bites of sea snakes are usually painless and may not even be noticed when contact is made. Teeth may remain in the wound. There is usually little or no swelling, and it is rare for any nearby lymph nodes to be affected. The most important symptoms are rapid breakdown of skeletal muscle tissue and paralysis. Paralysis of muscles involved in swallowing and respiration can be fatal. After 3–8 h, myoglobin as a result of muscle breakdown, may start to show up in the blood plasma, which can cause the urine to turn a dark reddish, brown, or black color, and eventually lead to acute renal failure. After 6-12 h, severe muscle breakdown, can lead to cardiac arrest or even to death in some cases.