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The plant is planted in ponds and freshwater fish tanks. It is one of the few flowering oxigenators of the water and the delicate foliage is giving shelter to fish and their spawn.
The springtime abundance of algae and the glut of nutritive created by the leaves and residue after the winter season causes some trouble to gardeners. Since the water plants in the pond have not yet sprouted and then would be well equipped to decompose the nutritive, the algae take on this task.
Therefore the aim should be to increase the number of aquatic plants in order to curtail the growth of algae. The sub-aquatic plants are especially well-equipped as competitors. The water violet (Hottonia palustris) is easily grown in almost any pond and is best left to itself once it has been simply thrown into the water. The herb offers valuable oxygen and thereby extract the algae’s necessary basic needs for survival. As this plant has only little capacity for displacement, it is best planted individually.
In fish tanks just as in soil or in natural water bodies a decomposition process takes place converting dead animal or vegetable material and animal excretions firstly to ammonium(pH > 7 ammonia), then to nitrite and finally to nitrate. In doing so, oxygen is affixed to nitrogen residue from amino groups or urea (CHC matter). This process takes place inside the bacteria that exploit ammonium as a nutritive and oxidise it in its metabolism. Likewise we humans metabolise carbon dioxide in producing energy from carbon hydrate (glucose and starch). And so the resulting nitrite (NO2) is a carbon waste of the bacterial metabolism. Other bacteria exploit the nitrite for their own nutritive demands and metabolise the molecule a second time. The resulting nitrate (NO3) therefore has triad. Hottonia pallustris, however, disintegrates in a fish tank with too high a level of nitrate (>10mg/l) (Kramer 2001).
The plant serves the water beetle (Graphoderus bilineatus) in its reproduction cycle.
It makes its appearance exclusively in water bodies. It is nearly always found in large standing waters with a thick ground cover on the banks and in the shallow water reaches.
The water beetle mates in water. The male beetle has developed especially wider front legs to hold the female beetle in place. The oviposition is effected above the water level into the pedicels of the water violet (Hottonia palustris), most likely other inflated parts of the plant also come into consideration.
This species of beetle is ranked as highly endangered and therefore is enlisted in the International Red List in Switzerland.