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ARTICLE INFORMATION
Author:
David Marshall and Kevin Webb
Title: Mogurnda mogurnda - The Most Popular Australian Goby
Summary: How to keep and breed a small fish found in northern Australia and in New Guinea, which is commonly known as the Northern Purple Spotted Gudgeon, Australian Spotted Gudgeon, Northern Trout Gudgeon, or Chequered Gudgeon.
Contact for editing purposes:
email: davidplaty@davidmarshall5.wanadoo.co.uk

Date first published: March 2003
Publication: Ryedale Reporter, Ryedale Aquarist Society, England http://www.ryedaleaquaristsociety.co.uk
Reprinted from Aquarticles:
February 2003: The Calquarium, Calgary Aquarium Society
July 2004: Translated into Dutch, on Jan Bukkems' Aquavisie web site in Holland, at:
http://aquavisie.retry.org/Database/Artikelen/Mogurnda_mogurnda.html
ARTICLE USE: 
Internet publication (club or non-profit web site):

   1. Credit author, original publication, and Aquarticles.
   2.  Link to http://www.aquarticles.com  and original
        website if applicable.
   3.  Advise Aquarticles
Printed publication:
Mail two printed copies to:

David Marshall,
16 Potter Hill,
Pickering.
North Yorkshire
YO18 8AA
England
And one copy to:

Aquarticles.com
4342 Capilano Road,
North Vancouver.
British Columbia. V7R-4J7
Canada.

Mr. Kevin Webb, who has a near 20 year friendship with Ryedale A.S., is a well known Yorkshire aquarist whose photographic skills are seen on the pages of aquatic magazines throughout Europe and who has also contributed such material, in partnership with David (who writes the articles), to FAMA.

Mogurnda mogurnda - The Most Popular Australian Goby

By David Marshall and Kevin Webb
Written for the March 2003 issue of the Ryedale Reporter, Ryedale Aquarist Society, England
Aquarticles

 

BACKGROUND - Researched by David Marshall

General -The genus Mogurnda contains small substrate dwelling gobies which have shown great boldness, a tolerance to low salinity levels and an ability to survive at oxygen levels many other fish species would find intolerable in order to triumph over a variety of natural and man-made water obstacles thus allowing them to thrive in a variety of freshwater habitats (including boreholes, fast flowing streams and ponds) throughout Australia and New Guinea.

Scientific Name - Mogurnda mogurnda

Common Names - Northern Purple Spotted Gudgeon, Australian Spotted Gudgeon, Northern Trout Gudgeon, Chequered Gudgeon.

Size - 170mm - Usually a little smaller in aquaria.

Range - Mogurnda mogurnda is the only member of its genus with natural populations found in both Australia and New Guinea. Australian populations range in the northwest across Kimberley and Arnhem Land to the Gulf of Carpentaria drainage, Cape York and eastwards towards the Mossman River. New Guinea populations are found in the lower Kikori River system westward to Etna Bay in the Irian Jaya province. Throughout their natural range these fish can be found in a variety of habitats, where they make good use of all available cover and eat any animal or plant material they find edible.

Aquarium Care - Aquarium with a minimum size of 60x40x40cm. Temperature 25 C. pH 7 to 8. Decor of plant pots, plastic/real plants and variously sized rocks. Not for the general tropical freshwater community. Have a reputation as 'fin nippers'. Will eagerly consume all commercial aquarium fish foods. Keep a tight fitting lid on their aquaria as, when frightened, these fish can jump clear of their home (natural predator defence).

Reproduction - In the wild pairs spawn during the rainy season, November to February, with a mature female ripening with eggs to a maximum of 10 times during this short period of time.

BREEDING - By Kevin Webb

Two pairs of M. mogurnda, approx. 5cm in total body length, were added to an aquarium of 60x40x40cm. Resident here were a number of Corydoras. Added to the regular diet of these fish, as a pre-spawning conditioner, were prawns, high protein pellets and frozen bloodworms.

Roughly 8 weeks later one of the males began to show an increase in blue body colouration and began to signal a desire to breed (David - another sign to watch for is the urinogenital area which becomes very pointed). When a female, ripe with eggs, responded, she chose the glass sides of the aquarium on which to lay a batch of eggs (young females lay a maximum of 20 eggs with the number rising to 150 for a mature female, although I would put the figure closer to 200 in some of the spawnings I have witnessed). The male had followed his mate in close proximity, and upon fertilising these eggs, took on the parental duties of egg fanning and keeping all other fish, his mate included, away from the spawning area.

The demersal adhesive eggs are attached, in a cluster of around 50mm in diameter, to the glass by small threads, and waft in the current like those of the tropical marine Clownfish.

Reports from the wild suggest that it takes the eggs between 8 and 10 days to hatch, but I have found that in aquaria they will hatch much quicker than this. On average 5 days is taken for the eggs to hatch, with 7 days my longest recorded time.

Once the eggs hatch any parental care ceases, and thus you must either remove the adults or take a risk that only a small number of fry will survive predation etc. As soon as these particular eggs hatched, they and the resultant fry disappeared very quickly. Fortunately I was quick to conduct a thorough tank search and managed to rescue a small number of fry. Two further spawnings quickly followed, with a small number of fry rescued from each spawning.

Now was the time to experiment, so when two further spawnings occurred I removed the eggs prior to their hatching, and artificially hatched these. In this way I managed to raise between 60 to100 fry.

For my next breeding experiment a group of 20, of equal sex, M. mogurnda were placed into an aquarium of 90x60x40cm. This aquarium was filled with aged aquarium water (which contained no salt) and kept at a stable temperature of 28 C, DH of 61 and a pH of 7.5. Decor consisted of a variety of aquarium friendly rocks and boulders. Much spawning activity followed, but once again all eggs were laid directly onto the side glass.

Once the fry have used up their yolk sac they are fed on brine shrimp and quickly grow.

If you come across these particular fish in your local aquarium store they are interesting little fish to keep.