All snakes can swim, their morphology makes it possible for them to hunt both on land and in water, and there are species which surely prefer water as their main life environment. Fresh water snakes are usually waiting for their prey under tree branches fallen in water or underneath overhanging trees. Hence, when on a fishing expedition, you need to do pretty much the same thing as when you go in the wild on land and do your best to stay away from snakes. Some species hang to tree branches and once movement is spotted, they instantly drop; this is rather dangerous if you get one of these poisonous species into your boat. Dealing with a frightened snake in the crammed space of the boat can be scary for anybody.
Some water snakes are harmless to humans while others are a real threat. If we consider for instance water snakes living in open seas, then, keep in mind the fact that they have been rated among the most venomous creatures on earth. The toxic composition of the venom has been adapted to the water environment: every strike should be a kill or they lose the prey that flees or drops on the bottom of the ocean. Nevertheless, there are less chances of becoming the victim of sea water snakes than encountering a water moccasin. Most of the advice given in survival guides consequently refers to the ways to deal with fresh water snakes that live in wetlands, lakes and rivers.
When you go boating don't forget to get a handled reptile grip to in the boat if you have to cross river areas with overhanging branches. Practice with small and large hose pieces before you launch the canoe, so as to be ready for the least friendly of water snakes. Swimming water snakes are not a threat to you, if you are on boat as they cannot jump out of the water. Should there be bites, an identification of the snake would be of much help in case you need to administrate an antivenin.
The bite of nonvenomous water snakes usually looks like a horse shoe-shaped area of tiny punctures that may be bleeding or not. In case you get only two punctured wounds, then you must have been bitten by a venomous snake and an emergency medical intervention is immediately necessary. A venom removal pump should always be present in the first aid kit in the boat as a means of delaying the spreading of the toxin in the blood and thus buy some extra time before the administration of the antidote.
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