Page 6 - tbas-test-1

-6- TBAS September 2018 ....................
the West African genera of killifish coming from the Congo Basin. I have included
water quality data from several locations in West Africa and Argentina so that the
killifish breeder may get a better idea of the requirements for spawning the species
originating in these areas. Water data from a jungle stream in the region of Cribi
in the Cameron gave a pH of 5.2, total hardness of 3.6 ppm and a temperature of
26 C. at 2 p.m. in the month of January (Hafelin, Walter 1976).
o
The genus Aphyosemion has several species requiring water very low in
dissolved salts; these include: A. celiae, A. coelesti, A. cyanostictum, A. ocel-
latum, A . primigenium, A. schmitti as well as the members of the groups A.
cognatum and A. ogoense. Note that in the following that potassium
permanganate demand (KMnO ), is an index of the amount of total organic
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compounds present in the water; the higher the KMnO demand, the higher the
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total dissolved organics present.

A water hole 30 kilometers east from Monila in Gabon gave the following:
pH = 6.6
Total hardness = 20 ppm
Chloride (Cl ) = 1.4
-
KMnO demand = 57
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Conductivity = 54 micro Siemens

A swampy water hole near Lambarene, Gabon gave these results:
pH=6.1
Total hardness= 5 ppm
Chloride (Cl ) = 2 ppm
-
KMnO demand= 63 ppm
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Conductivity= 16 micro Siemens

A clear mountain stream at an elevation of 800 meters between Atogafina
and Mala in Gabon gave:
pH=6.1
Total hardness = 8.6 ppm
Chloride (Cl )=2 ppm
-
KMnO demand = 47 ppm
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Conductivity = 20 micro Siemens
A waterhole by Cape Esterias north of Libreville in the coastal rain forest gave:
pH=4.1
Total hardness = 4 ppm
Chloride (Cl ) = 6 ppm
-
KMnO demand = 426 ppm
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