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Common galaxias
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Actinopterygii
Order: Osmeriformes
Family: Galaxiidae
Subfamily: Galaxiinae
Genus: Galaxias
Species: G. Chordates ( Phylum Chordata) are a group of Animals that includes the Vertebrates together with several closely related Invertebrates Vertebrates are members of the Subphylum Vertebrata, Chordates with backbones or spinal columns The grouping sometimes includes The Actinopterygii (the plural form of Actinopterygius) comprise the class of the ray-finned fishes. Osmeriformes is an order of Ray-finned fish that includes various kinds of Smelts Noodlefishes and the odd-looking Barreleyes The The Galaxiids are a family of mostly small freshwater Fish. Representatives occur throughout the southern hemisphere including South Africa, South America Galaxiinae is a subfamily of fishes It contains four genera maculatus
Binomial name
Galaxias maculatus
(Jenyns, 1842)
Synonyms

Mesites maculatus Jenyns, 1842

The common galaxias, Galaxias maculatus, is a species of fish from the galaxiid family that is very widespread in the southern hemisphere. Year 1842 ( MDCCCXLII) was a Common year starting on Tuesday (link will display the full calendar of the Gregorian Calendar (or a Common In Scientific nomenclature, synonyms are different Scientific names used for a single Taxon. The Galaxiids are a family of mostly small freshwater Fish. Representatives occur throughout the southern hemisphere including South Africa, South America Southern Hemisphere is the half of a Planet that is South of the Equator —the word hemisphere literally means 'half ball' It is a slim narrow fish with a forked tail and as an adult it lives in freshwater rivers and lakes. Common galaxias grows to a length of 40 to 120 mm, but can grow up to 180 mm. The Millimetre ( American spelling: millimeter, symbol mm) is a unit of Length in the Metric system, equal to

Common and local names

Contents

Distribution and habitat

Common galaxias are one of the most widely distributes freshwater fish in the world and can be found around throughout New Zealand; in coastal streams in south eastern Australia, Tasmania and some parts of south west Western Australia; in Patagonia Argentina; in the Falkland Islands; and, in some Pacific Islands such as New Caledonia. This article discusses the Māori people of New Zealand For their language see Māori language, and for other meanings see Māori (disambiguation. New Zealand is an Island country in the south-western Pacific Ocean comprising two main landmasses (the North Island and the South Island For a topic outline on this subject see List of basic Australia topics. Tasmania is an Australian island and state of the same name It is located south of the eastern side of the Continent, being separated from it by Bass Western Australia is a state occupying the entire western third of the Australian continent. Llao LLaojpg|thumb|250px| Lake Nahuel Huapi, near Bariloche, Argentina For a topic outline on this subject see List of basic Argentina topics. The Pacific Ocean contains an estimated 20000 to 30000 Islands (the exact number has yet to be precisely determined For the former North American fur-trading district see New Caledonia (Canada, and for the Scottish colony in Panama see Darien scheme.

Adults mainly occur in still or slow moving water in the lower parts of coastal streams and rivers. They are also found around the edges of lakes and lagoons. It is often found in schools that are not very large. A school (from Greek σχολεῖον - scholeion) is an Institution designed to allow and encourage Students (or "pupils" They can tolerate a wide range of natural conditions.

Life history

Unless within a lake which is landlocked, the common galaxias spawns downstream in rivers and streams amongst vegetation on the banks of the estuary regions during a spring tide mainly in autumn. Spawning is the production or depositing of large quantities of eggs in water An estuary is a semi-enclosed Coastal body of Water with one or more Rivers or Streams flowing into it and with a free connection to the open Characteristics A tide is a repeated cycle of sea level changes in the following stages Over several hours the water rises or advances up a beach in the flood The eggs remain on the bank (out of the water) until the next spring tide when they hatch into larvae which are swept out to the ocean. In Roman mythology, the larvae or lemures (singular lemur) were the spectres or spirits of the dead they were the malignant version of the For the next 5-6 months the larvae live in the sea and develop into juvenile fish, often referred to as whitebait. A juvenile is an individual Organism that has not yet reached its Adult form Sexual maturity or size This article is concerned with whitebait as the juvenile of various species of fish around the world for other uses of the term see Whitebait (disambiguation. When they are about 30 mm in length and 3-4 mm in width they swim up a river on the incoming tide until they reach a suitable habitat where they develop into the adult form. As adults they eat insects, crustaceans, and molluscs. Insects ( Class Insecta) are a major group of Arthropods and the most diverse group of Animals on the Earth with over a million described Structure of crustaceans As Arthropods crustaceans have a stiff Exoskeleton, which must be shed to allow the animal to grow ( Ecdysis or molting Molluscs are animals belonging to the phylum Mollusca. There are around 250000 extant Species within the phylum with an estimated 70000 In other words they share the diet of introduced trout. Trout is the common name given to a number of Species of Freshwater Fish belonging to the Salmonidae family Indeed introduced trout are a major threat to these fish and in areas where introduced Trout has become naturalised galaxias are scarce. Introduced Trout not only compete for food but also readily eat this species. Common galaxias, therefore, are mostly found in stretches of streams and rivers that are not suitable for introduced trout.

This species lives for about twelve months and usually dies after spawning.

In New Zealand, Deretrema philippae (=Limnoderetrema minutum) is known to parasitize the intestine (and possibly gall bladder) of the common galaxias. Parasitism is a type of symbiotic relationship between Organisms of different Species. In Anatomy, the intestine is the segment of the alimentary canal extending from the Stomach to the Anus and in humans and other mammals consists The gallbladder (or cholecyst sometimes gall bladder is a small organ whose function in the body is to store Bile and aid in the digestive process Similarly, the intestinal parasite Steganoderma szidati has been reported from this species' Argentinian population. These are digenean flatworms (Etchegoin et al. Digenea (Gr Dis - double Genos - race is a subclass within the Platyhelminthes consisting of Parasitic Flatworms with The flatworms (Phylum Platyhelminthes from the Greek πλατύ platy, meaning "flat" and ἕλμινς (root ἑλμινθ- helminth- 2002).

Fishing

The juveniles are caught as whitebait while moving upstream and are much valued as a delicacy leading to their protection with licensing and controlled fishing seasons in order to preserve adult populations. This article is concerned with whitebait as the juvenile of various species of fish around the world for other uses of the term see Whitebait (disambiguation. Fishing may be both for recreational and commercial activity depending on the geographic location and size of the populations.

Some jurisdictions permit fishing of the adults but again under regulation or licence in order to preserve the adult population but others ban it altogether unless the fisher belongs to an indigenous people (e. g. , New Zealand Māori). New Zealand is an Island country in the south-western Pacific Ocean comprising two main landmasses (the North Island and the South Island This article discusses the Māori people of New Zealand For their language see Māori language, and for other meanings see Māori (disambiguation. For instance, in Tasmania, the adult common galaxias may only be caught using a pole of a specified maximum size (one metre). Tasmania is an Australian island and state of the same name It is located south of the eastern side of the Continent, being separated from it by Bass

References

External links

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