TRACKING OF SCAVENGING FISHES IN THE ABYSS

In the early nineteenth century it was thought that no life could exist below a depth of 1000 M. A decade ago this limit had been greatly extended but it was believed that deep abyssal fish were largely static, waiting for food to drift their way. Today, thanks largely to the use of deep ocean submersibles and acoustic tracking devices, it has become clear that some such fish are very mobile, foraging over large areas.