Stomach contents regularly contained whole specimens of Patagonian toothfish, and discarded fish heads of that species (fishery waste), which were most likely eaten directly in trawls and scavenged at the bottom, respectively. Other prey items were demersal fishes (mainly the skates Bathyraja irrasa and B. eatonii, and the nototheniids Notothenia rossii and Lepidonotothen squamifrons), benthic invertebrates (e.g. sea stars, ophiurids) and carrion. The stomach of nine sharks contained big chunks of flesh (up to 30 kg), which, in 2 cases, were identified as belonging to fur seals (probably the Antarctic fur seal Arctocephalus gazella).
Clem said:What sticks out from Cherel & Duhamel’s benthic model for Somniosus is the presence of big Architeuthis, up to 220cm mantle length as indicated by recovered beaks. If Archis become more ammoniacal as they mature, and “sink up” when they die, then it seems unlikely that these very large specimens found in Somniosus were scavenged off the sea-floor. Does Archi spend time in the mud, then, or is something else happening?
Steve O'Shea said:I don't know what effect temperature would have on buoyancy; anyone want to comment?