The weedy seadragons (Phyllopteryx taeniolatus) physiology is fascinating. They have a long snout that they use to catch their prey and have a close vision of focus that extends a little beyond this. It could be the reason they hunt their prey in such close proximity. They continually feed on mysids, small shrimp like crustaceans and from juvenile age to being fully-grown they increase by 10 times their weight. Researchers have tagged weedy seadragons and have determined that their life span is approximately six to seven years, which is longer than most seahorses of the Syngnathidae family.