Thayeria boehlkei, Weitzman, 1957
Origin:Brazil, Rio Araguaia, Peru, Amazonas.
Etymology: Named in honour of Dr. James E. Boehlke.
Synonyms: Thayeria obliqua, Auct (non Eigenmann), until 1957.
First European import: Netherlands, 1935, as Thayeria obliqua.
Description: See pictures
Care:Peacefull and quiet fish that are well suited for the average community tank.Pretty indifferent to water types, the fish can even be kept in brackish water. Regular waterchanges are required, the fish are somewhat sensitive if kept in dirty water. The fish almost always swim at an angle, and moves around the tank gracefully. A small shoal of these fish can be quite attractive and interesting, and add some variation to the community tank. In it's original habitat the fish can be found in densely planted waters, which are soft and receive only indirect sunlight. Other factors that attribute to the fish' beauty are a dark soil and some floating plants.
Feeding:Omnivorous, all food is taken.
Size:Up to 6 cm.
Breeding: Very productiv, 1-3000 eggs are laid by a single female. Every time the fish spawn 10-50 eggs are deposited. The fish spawn near the surface. To get the fish to spawn the tank should have a lowered waterlevel 15-20 cm, and be densely planted. A bit higher temperatures(27 degrees), and after that a couple can be added. Tempered light is necessary as well, bright light can damage the eggs and fry. The fry hatch in 12-15 hours, are free swimming after a day, and can grow quite fast. After approximately a month start to show the typical dark line.
Both by Pinter and Baensch and Riehl it has been described that after spawning the waterquality in smaller tanks can decrease rapidly because of rotting sperms and unfertilized eggs. Waterchanges,or trypaflavine and/or larger tanks (100liters or more) are necessary
Sexual dimorphism:Can only be observed if in breeding condition, the females have a more developed belly at that time.
Prices:Netherlands: 1.5-2 €
Additional: Thayeria obliqua has a similar appearance, only the dark line on the side and in the caudal tail starts beyond the dorsal fin.
The fish swim at an angle because of the way the caudal fin is built, and due to it's muscular structure. This makes the tail of the fish heavy, and causes it to swim at an angle.
Picture references:Picture 1 + 2 : E. Naus
References:Baensch, H. A., Riehl, R.(1982): Aquarien Atlas I. Mergus Verlag, Melle, Germany.Pinter, H.(1966): Handbuch der Aquarienfischzucht. Alfred Kernen Verlag, Stuttgart, Germany.
Hoedeman, J. J.(1969): Aquariumvissen encyclopedie 3. Elsevier Nederland B. V., Amsterdam, The Netherlands.
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