Except from the Striped Mackerel the other fish in this section are predators. They can be very fast and as many of the fish they hunt are schooling species that stick together it can be an advantage for the hunters also to join forces. Thus you will sometimes see a group of trevallies along the reef.
The silvery look reflects a lot of light, this helps them to stay invisible in the water, and they can come close and surprise. That is why the Milkfish can sometimes make your heart hop. When it comes out of the blue, fast and with a large tail, that at first glimpse may resemble a shark. The good reflection also makes it very difficult to take photos using a light source.
As for all sections of the book, there are many other silvery fish species that you can encounter. They come in different shape and sizes. – E.g. the Giant trevally is also common in some places.
Smooth cornet fish can sometimes be found hidden with camouflage colouring along the reef, and change instantly when swimming up in the Water.