
The first-ever detailed study of the diets of great white sharks off the east Australian coast reveals this apex predator spends more time feeding close to the seabed than expected. This indicates the sharks must spend a good portion of their time foraging just above the seabed,” said lead author Richard Grainger, a Ph. The study, published today on World Oceans Day in the journal Frontiers in Marine Science, is an important contribution towards understanding the sharks’ feeding and migratory habits. Vic Peddemors a co-author from the NSW Department of Primary Industries Fisheries, said: “We discovered that although mid-water fish, especially eastern Australian salmon, were the predominant prey for juvenile white sharks in NSW, stomach contents highlighted that these sharks also feed at or near the seabed. Mr Grainger said: “This evidence matches data we have from tagging white sharks that shows them spending a lot of time many meters below the surface. The scientists compared this with published data elsewhere in the world, mainly South Africa, to establish a nutritional framework for the species. Mr Grainger said: “White sharks have a varied diet. As well as east Australian salmon, we found evidence of other bony fish including eels, whiting, mullet and wrasses. We found that rays were also an important dietary component, including small bottom-dwelling stingrays and electric rays.
How fast can a shark swim? This question may pop into your mind as you calmly watch a shark video or more urgently as you are swimming or scuba diving and think you may have spotted a fin circling you. If you are fishing, you may wonder whether the shark will be able to outpace your boat. Sharks are built for bursts of speed as they attack their prey, much like lions and tigers on land. They need to be able to swim fast enough to pursue their prey for short distances, then make the lunge for the kill. The speed of a shark also depends on the species. Smaller, streamlined species are capable of higher speeds than larger, bulkier sharks. The general rule of thumb is that sharks can cruise at about 5 mph 8 kph —roughly the same speed as the fastest Olympic swimmer. If you’re just a good swimmer, they have you beat. But often they are swimming around at a slower speed of about 1. These fish are predators. Sharks can swim much faster over short bursts when they are attacking prey.
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