Meanders of a forest stream, a tributary of the Chodelka River near Bełżyce, Poland

_ place in Biotope Aquarium Design Contest 2019

Volume: 225 L
Dimensions: 150x50x30 cm
List of fishes: Gobio gobio, Orconectes limosus
List of plants: N/A
Description of decorations: For the decoration were used: limestone, sand, roots. the riverside was made of sand and epoxies. Making it from natural materials would not be permanent.
Description of equipment: filtration: unimax 250. Water circulator 2000l / h. 150W light. Aquael OXYPRO 150.
Water parameters: Temperature 17-22°C, pH 7,5, ppm 160.
Additional info: Water changes once a week 30%. In cold water aquariums, additional aeration of water is more important than low temperature. In cold water there is more oxygen, if we can not lower the temperature, we must provide more oxygen. (Aquael OXYPRO 150.)


Description of the area surrounding the biotope: A small stream originating in forests to the southwest of the city of Bełżyce. These are mixed forests, the most common tree species are: Quercus, Carpinus betulus, Pinus silvestris, Alnus glutinosa. The biotope is located in a temperate cold climate. The driest month is January. There is a rainfall of 24 mm at this time. The greatest precipitation appears in July, with an average of 77 mm. July is the hottest month with the average temperature of 18.5 ° C. The lowest average temperature in the year occurs in the month of January and is about -5.6 ° C.

Description of the underwater landscape of the biotope: The stream’s sources flow from a small hill. The silty bottom is overgrown with algae. After about 20 meters, the bottom is covered with limestone and sand, the banks are overgrown with roots, mosses and dead wood.

Description of the parameters of the habitat: Transparent water, pH 7,57, ppm 179, temp. in summer 14-15 ° C

List of fishes and invertebrates occurring in the nature biotope: Barbatula barbatula, Gasterosteus aculeatus, Gobio gobio, Gammarus pulex, Orconectes limosus (Invasive species)

List of plants found in the nature biotope: Algae

Threats to the ecology: Due to global warming, the stream dries up. In the summer about 200m from the sources the depth of water was 1cm !!! Despite the harsh conditions, there are fish there, probably their last years in this biotope. Also people who ride off-road vehicles contribute to the destruction of the biotope. One of the local small miracles of nature dies.

Sources of information: I researched the biotope myself because there is no information about this river:

Comments of the members of the jury of Biotope Aquarium Design Contest 2019