قراءة لمدة 1 دقيقة Triggerfish

Triggerfish are about 40 species of often brightly colored fish of the family Balistidae.
Triggerfish are native to tropical waters.
A prehistoric pufferfish called "Zignoichthys" bore a resemblance to them.

Most are found in shallow, coastal habitats, especially at coral reefs, but a few, such as the ocean triggerfish are pelagic.
Triggerfish are very popular in the marine aquarium trade.
However, they are often grumpy.

There are reports that triggerfish have attacked humans due to them being territorial, but these attacks are extremely rare.

Description.

Triggerfish have an oblong-shaped, laterally compressed body.
The head is large, having a small but strong mouth with teeth adapted for crushing shells.

They have small eyes set far back from the mouth and at the top of the head.
To protect themselves from predators, triggerfish can erect the first two dorsal spines:
The first (anterior) spine is locked in place by erection of the short second spine, and can be unlocked only by depressing the second, "trigger" spine, hence the name triggerfish.

Triggerfish sizes.

The stone triggerfish ("Pseudobalistes naufragium") reaches 1 m (3.
3 ft) and is the largest of them all.
The titan triggerfish ("Balistoides viridescens") is also relatively large, but it is not the largest ever.

Behavior.

Male territoriality.

Some male species (i.
e.
"Balistes carolinensis" and "Pseudobalistes flavimarginatus") build hollow nests within their territories.
They often like to guard their territories as having a territory is essential for reproduction.

Mating systems.

The species "Xanthichthys mento" and yellowmargin triggerfish have eggs spawned in the morning.
They hatch after the sunset (more specifically, night), which is unusual.

Life history.

A triggerfish lays its demersal eggs in a small hole that has been dug into the seabed.
Off Florida, juveniles of some triggerfish are found in floating sargassums, where they often feed on small shrimp, crabs, and mollusks.

Classification.

There is also an extinct genus:

What they eat.

They'll feed on benthic invertebrates, such as crabs, sea urchins, shrimp, sand dollars, lobsters, and mollusks.

Human uses.

Some species of triggerfish, such as the titan triggerfish, may be ciguatoxic and cannot be eaten.
Others, however, such as the grey triggerfish ("Balistes capriscus"), are edible, meaning you can eat them.

Triggerfish attacks.

Triggerfish can bite and suck blood from its attacker to weaken them.