Indonesian Archerfish: Masters of the High-Speed Water Jet Hunt

The "archerfish" (Toxotes jaculatrix), found in the coastal waters of Indonesia, is renowned for its unique and remarkable hunting technique to capture insects above the water's surface. This fish is capable of accurately shooting high-speed water jets at insects perched on leaves up to two meters above the water. Its prey includes a variety of small insects such as bees, dragonflies, spiders, and flies. The archerfish's hunting prowess extends beyond mere water projection. Despite the light refraction at the air-water boundary, which causes the prey's position to appear different from its actual location underwater, the fish can accurately calculate the target. Research by Lawrence M. Dill in 1977 indicated that archerfish adjust their shooting angle based on the prey's position to compensate for light refraction. Furthermore, they account for the gravitational curve of the water jet's trajectory, ensuring it reaches the target precisely. Another study published in the journal Current Biology in 2014 revealed that archerfish can control the dynamics of their water jets. The rear of the jet moves faster and catches up to the front just before hitting the prey, causing water droplets to merge and deliver a powerful impact. This sophisticated biological adaptation is a crucial survival strategy for archerfish in the shallow waters of the Indo-Pacific region, including Indonesia.