There is no certain leader. They swim in schools because its hard for a bigger fish to catch all then just one.
SWIM!
Fish swim in schools. Other marine species, like whales and dolphins (which are mammals) swim in "pods"
Up and down. All marine mammals swim with vertical motions, and fish swim with horizontal motions.
Because they don't enough oxygen to breath. They are not used to swim in cold waters.
Of course they can swim, that's why they are marine turtles, you know mariners.
Yes. They are Marine mammals. They can live on land, but must swim to find fish to eat.
Plesiosaurus most likely was solitary. With the exception of marine mammals, there aren't any truly social aquatic creatures. Some fish swim in schools, but there is no social structure. Marine reptiles aren't even known to swim in groups, much less to have social interaction.
although the shallow water that the swim in is warmer than the deep sea, the water is mostly cold. they have to chill it at marine parks
Yes fish can swim.
yes. all dogs do. although they have extra body fat, to be able to swim in cold waters to catch fish that escape from nets,they do get cold.
Fish can swim in any direction.