no. cartilaginous fishes are sharks and rays.
Fur seals eat fishes, squid, krill and tuna.
sharks, whales, dolphins, sea birds, larger fishes like tuna, sea lions, seals
The predators of the blue tang are Tuna, Bar jack, Tiger grouper, and other large carnivorous fishes.
tuna
Yep. That is how sharks get to eat tuna.
There are between 360 and 400 known species of sharks, and their diet is not all the same. In general, sharks prefer live fish. However, they have been known to eat dead fish, and some species are considered valuable for how they clean up the sea of dead and wounded fish. Great white sharks have been known to feed on dead whales (which are mammals, not fish).
Fishes, tuna, and plankton
humans and sharks
Salmon and Tuna are most known fishes for yielding the fish oil.
tuna fish
Some tuna species (such as yellowfin tuna and skipjack tuna but not albacore tuna) associate with dolphins in the ocean. This helps themto avoid being eaten by sharks, which are one of their predators. Sharks are strongly attracted to tuna fish, even if the tuna fish are not injured or bleeding. However, examination of the contents of the stomachs of various sharks indicates that tuna fish have evolved to swim too fast for sharks to catch up to them and end up being eatenby sharks only occasionally.Other predators of tuna fish include orcas (killer whales), false killer whales, pilot whales, bottlenose whales, bottlenose dolphins, and marlins but the giant, filter-feeding whales and sharks can only eat small fish, which are usually not small tuna fish. Also, sperm whales occasionally eat tuna fish but like sharks, they tend to be too slow to catch up to tuna fish in most situations.However, because of man's strong appetite for tuna fish, humans are the only real possible threat to the sustainability of tuna fishing.Interestingly, blue sharks can swim as fast as tuna fish. Also, seals can swim faster than great white sharks but end up being frequently eaten by great white sharks because great white sharks wait patiently and then ambush them from deep below by surprise. All predatory sharks like to pretend that they are just harmless filter feeders when a large school of fish approaches them.