Queen parrotfish (Scarus vetula)

The male queen parrotfish (Scarus vetula) is one of the most striking fish in the Carribean and happens to be my 2nd favorite fish. Females are a drab blue brown color while males are green-blue. This is an example of sexual dimorphism. Both sexes have plate-like beaks which give them the name parrotfish. They use these beaks to break off coral covered in algae. they then chew that mass and excrete the matter that isn’t algae. This process creates sand from the coral they ingest and is actually a major way in which sand is produced. This grazing also opens up space for coral to grow back in areas overtaken by algae. In areas without parrotfish reefs have been shown to shrink because coral can’t out-compete algae. They also feed on sponges and other creatures that may be attached to the reef. The fish is also known by the names blownose, blue chub, blueman, blue parrotfish, Joblin crow parrot, moontail, Okra peji, and slimy head. They are native to reefs in the Carribean, and thus also restricted to shallow water. 1622-parrotfish_0

The fish breed throughout the year but typically restrict breeding to mornings. The fish exercise harem polygyny, which means that one male mates with a harem of females. They school in groups with one male and 3-4 females. However, the fish are also protogynous hermaphrodite which means that they can change their sex from female to male. In fact, all queen parrotfish are born as females. As they mature the largest in the school becomes male. The male that mates with the females is called a supermale and is identifiable by his bright coloration. The male chases the females and they swim in tighter and tighter circles until they release their gametes and the eggs are fertilized through external fertilization.

queen_parrotfish_scarus_vetula_initial_phase_28345847526929
A female queen parrotfish (Scarus vetula)

The species has stable populations and is listed by IUCN as a species of least concern. However, in areas of Haiti and Jamaica that are heavily populated the species has had declines. Tourism and presence of the fish are closely linked. The fish is not commercially fished but locals do spearfish the species as it will not take a baited hook. Fisheries for parrotfishes are permanently closed in Bermuda.  Grouper, eels, and sharks also prey upon the fish. During the night time, the fish find a crevice to sleep in a secrete a mucous membrane around themselves for protection. The declines in coral reefs are also a concern for the survival of the fish.

fmib_38155_scarus_vetula_bloch_26_schneider

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s