by Mario Zanolli

Nothobranchius rachovi

 

Meaning of the word:

Notho= shiny, branchius= branchia, rachovi: dedicated to A. Rachow

 

Fish measurement:

D=14-16, A= 15-16, LL= 25-27

 

Chromosome

N=9, a=15

 

Code

RAC

 

Finding place:

It caming from Beira ( Mozambico ) from alluvial plain of Zambesi river and from Pungwe rivers, from seasonal pool along coastal plain from Quelimane in Mozambico to north-east of Kruger National park in the Republic of South Africa, where it often collected together with a N. orthonotus.

 

Measurements:

Male reach 5 cm while female is just a more little.

 

Description:

The male is without any doubt one of the most coloured fish in itís species. The body is orange and blue metallic ; the unequal fins are deeply blue and the caudal fin finishes with two borders, one orange and the other one black.

The colouring of the species in the south area is less intense and the colour base is brownish colour. On the male one of the two colours predominates, depends from the origin : if is predominant the colour orange-red we can talk of ďredĒ stock , while is the blue with turquoise shading  who prevails we can talk of ďblueĒ stock. The different colouring is much more noted on odd fins.

The female is grey-pink and definitely much more pink, shining then the other species of Nothobranchius.

 

Breeding and reproduction:

N.rachovi can not be breed in a community aquarium as it needs of water with a high percentage of  sea salt  so a conductivity from a minimum of 800-1200 mS (micro Siemens ) to over 2000 mS in order to avoid Oodiniumís attack and to maintain a perfect vitality and reproduction.

 We can prepare a tank with 20 litres of water duly filtered for some days with the peat and salt. We donít introduce either gravel or fitting out, itís enough an internal filter, in air order to maintain clear the water. In this way breeding tank can be utilize for the reproduction. In the little tank we can breed both couple or  trio or a numerous group of male and female never two couples as the males will fight until the dead. The breeding doesnít present particular problems, itís very important to respect the two principals rules: deep freeze food and live in big quantities ( please do not use dry food ) frequently partial change of water with a little tube of aerator ( which permit a slowly change of the new water ) with the same temperature of that used for the breeding 26-28 grades.

For the reproduction we utilize a tank of 5-10 litres with the water of breeding tank,; as a substratum we use a sheet of garden peat of 2.5 cm not fertilized.  In order to sink the peat we need to prepare a pail with hot water on which you have to rub the peat with your hands. After one week the substratum is ready for the Notho. The peat has to be rinse in a sieve to clear it from piece extremely thin. After two weeks of reproduction, take off the substratum with the eggs ( before, transfer the reproducing in an another thank with water of reproduction tanks and adding new one).

The peat took off has to be lightly pressed in a sieve with close mesh and gently opened on a paper in order to dry it up ( like humid tobacco ) then we transfer it inside a plastic pocket. If preserve it at a temperature of 24-28 grades eggs will hatch after 3 months but it always better to control them.  Spent the hatching we take a little tank of 5-10 litres, we put inside the peat and we add old water about 4-5 cm with a temperature of 15-18 grades with the same hardest of the deposition. After some hours will start the hatch. The little fishes have to be feeded twice per day with BBS just born. Every three days you have to add old water in order to filled up the little tank in ten days. After 10-15 days transfer the little fishes in a tank of 20 litres with an internal filter in air order filled before with the same water of the little tank and then very carefully with new one. In 40-60 days the young Notho colour up and are able to feed with deep freeze brine shrimp. The peat utilized for the hatching have to by dry several time and itís possible to hatch after 12 months.