Bluestreak cleaner wrasse
Encyclopedia
The bluestreak cleaner wrasse (Labroides dimidiatus) is one of several species of cleaner wrasse found on coral reef
s in the Indian Ocean
and much of the Pacific Ocean
, as well as many sea
s, including the Red Sea
and those around Southeast Asia
. Like other cleaner wrasses, it eats parasites and dead tissue
off larger fish
es' skin
in a mutualist relationship that provides food and protection for the wrasse, and considerable health benefits for the other fish.
Cleaner wrasses usually can be found around cleaning station
s. The bigger fishes recognise them as cleaner fish because they have a lateral stripe along the length of the body and their movement patterns. Upon recognising the cleaner and successfully soliciting its attention client fish adopt a species specific pose to allow the cleaner access to its body surface, gills and sometimes mouth. A species of blenny called Aspidontus taeniatus has evolved this behavior as mimicry, in order to tear small pieces of flesh from bigger fish. Another species the bluestreak fangblenny, Plagiotremus rhynorhncos, mimics juvenile cleaner wrasse so that its presence is tolerated by the cleaners and, it is assumed, can take advantage of the concentration of potential victims
All cleaner wrasses start their lives as females. In a group of 6–8 cleaner wrasses there is only one male, the rest are females or juveniles. The strongest female changes its sex when the male dies, an occurrence known as sequential hermaphroditism.
Cleaner wrasses sleep in crevices between rocks or corals, covered in a slime layer that is secreted at dusk. In the morning these can be seen floating on the surface.
Coral reef
Coral reefs are underwater structures made from calcium carbonate secreted by corals. Coral reefs are colonies of tiny living animals found in marine waters that contain few nutrients. Most coral reefs are built from stony corals, which in turn consist of polyps that cluster in groups. The polyps...
s in the Indian Ocean
Indian Ocean
The Indian Ocean is the third largest of the world's oceanic divisions, covering approximately 20% of the water on the Earth's surface. It is bounded on the north by the Indian Subcontinent and Arabian Peninsula ; on the west by eastern Africa; on the east by Indochina, the Sunda Islands, and...
and much of the Pacific Ocean
Pacific Ocean
The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic in the north to the Southern Ocean in the south, bounded by Asia and Australia in the west, and the Americas in the east.At 165.2 million square kilometres in area, this largest division of the World...
, as well as many sea
Sea
A sea generally refers to a large body of salt water, but the term is used in other contexts as well. Most commonly, it means a large expanse of saline water connected with an ocean, and is commonly used as a synonym for ocean...
s, including the Red Sea
Red Sea
The Red Sea is a seawater inlet of the Indian Ocean, lying between Africa and Asia. The connection to the ocean is in the south through the Bab el Mandeb strait and the Gulf of Aden. In the north, there is the Sinai Peninsula, the Gulf of Aqaba, and the Gulf of Suez...
and those around Southeast Asia
Southeast Asia
Southeast Asia, South-East Asia, South East Asia or Southeastern Asia is a subregion of Asia, consisting of the countries that are geographically south of China, east of India, west of New Guinea and north of Australia. The region lies on the intersection of geological plates, with heavy seismic...
. Like other cleaner wrasses, it eats parasites and dead tissue
Tissue (biology)
Tissue is a cellular organizational level intermediate between cells and a complete organism. A tissue is an ensemble of cells, not necessarily identical, but from the same origin, that together carry out a specific function. These are called tissues because of their identical functioning...
off larger fish
Fish
Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...
es' skin
Skin
-Dermis:The dermis is the layer of skin beneath the epidermis that consists of connective tissue and cushions the body from stress and strain. The dermis is tightly connected to the epidermis by a basement membrane. It also harbors many Mechanoreceptors that provide the sense of touch and heat...
in a mutualist relationship that provides food and protection for the wrasse, and considerable health benefits for the other fish.
Cleaner wrasses usually can be found around cleaning station
Cleaning station
A cleaning station is a location where fish, sea turtles, hippo and other aquatic life, freshwater and marine, congregate to be cleaned.The cleaning process includes the removal of parasites from the animal's body , and can be performed by various creatures A cleaning station is a location where...
s. The bigger fishes recognise them as cleaner fish because they have a lateral stripe along the length of the body and their movement patterns. Upon recognising the cleaner and successfully soliciting its attention client fish adopt a species specific pose to allow the cleaner access to its body surface, gills and sometimes mouth. A species of blenny called Aspidontus taeniatus has evolved this behavior as mimicry, in order to tear small pieces of flesh from bigger fish. Another species the bluestreak fangblenny, Plagiotremus rhynorhncos, mimics juvenile cleaner wrasse so that its presence is tolerated by the cleaners and, it is assumed, can take advantage of the concentration of potential victims
All cleaner wrasses start their lives as females. In a group of 6–8 cleaner wrasses there is only one male, the rest are females or juveniles. The strongest female changes its sex when the male dies, an occurrence known as sequential hermaphroditism.
Cleaner wrasses sleep in crevices between rocks or corals, covered in a slime layer that is secreted at dusk. In the morning these can be seen floating on the surface.
Further reading
- Meulengracht-Madsen, Jens: (1976) Akvariefisk i farger, J.W. Cappelens forlag AS
- Labroides dimidiatus at FishBase