Growing to immense proportions, even bigger than its relative, which it split off from, the strainbean, the giant shovelhead is a lazy creature that spends most of its life drifting aimlessly through the open oceans simply collecting sunlight. To supplement its diet, it still collect tiny organisms as it breathes in the water, but this is more like a secondary food source now. If you want to see one active, you'll have to come during a sunny day. At night or under clouds they don't move at all, to conserve energy. They can go weeks without any sunlight by just staying still and drifting with the current. Once a year, they will seek out a mate. They use special modified baleen sensors to pick up the scent of the opposite sex and slowly move their huge paddles and drift until they find a mate. Once they have, both mates will release their genetic material and hopefully produce some offspring. They then spend about a month staying near the new babies, which are still the same little filter-feeders to start, until they are larger enough, then they will each drift on their own until it's time to mate again.
Because of how slow they move, and how spread out they can get, individuals may not mate for years because they could not find a mate. Most of the little babies do not make it to adulthood. Because of their slow rate of travel, things tend to collect on them. To prevent things from collecting on the top, which is how where they get most of their food, they use what's left of their electric shocking ability. They don't, however, care about what collects on the bottom of their bodies.
Original image without water effects by Oviraptor