NIWA
Toothfish primarily eat other demersal (living close to the seafloor) fishes and squid, but in general their diet depends on which species live around them - i.e. they eat anything they can fit in their mouth. However, with the exception of squid and Antarctic silverfish, these species are also caught as bycatch in the toothfish fishery. So, the fishery could potentially change the prey available to toothfish.