Reef fish on a Curaçao coral patch never bolted from a black disk expanding on an iPad below two metres a second, and that threshold sits just under the speeds at which bar jacks on the same reef were filmed attacking

Reef fish on a Curaçao coral patch never bolted from a black disk expanding on an iPad below two metres a second, and that threshold sits just under the speeds at which bar jacks on the same reef were filmed attacking

The threshold sits at two metres a second. Below it no fish bolted. Above it they did, and the bar jacks filmed hunting on the same reef reached fast-approach speeds of 2.7 to 9.0 metres a second.