Okay, so I’ve tried this. I really haven’t had much success or luck with this, especially compared to a classic pole and line; but if you are desperate with no other resources available, or you’re bored, have some fun and give it a try. This is a method for employing when the water is waist deep or shallower and the fish are big; small fish are especially difficult to catch with a spear. The method above provides a nice spread and multiple points to increase the chances of a good strike.
If you are baiting the fish you need to consider the most likely places the fish will be feeding, around the perimeter of their natural habitat. This can be around flooded wood cover and debris, near shore lines, and especially along the edges of weed beds. Fish also tend to enjoy locations currents intersect and water temperatures change.
If you are in North America you will likely find bamboo scarce, but in an emergency situation any type of narrow straight wood rod that is not to dead and brittle. Below are some great examples of fish spears used BCE (Before the Common Era), and into or modern world by primitive peoples.
Check out the sight below, it is where I grabbed the historic photo and has a list of valuable resources for people new to the trade. If you have a method for fish spears that have worked and is worth sharing, please do.