Small rivers in the mountains, south, South Korea

_th place in Biotope Aquarium Design Contest 2020

Volume: 150 L
Dimensions: 150x45x50 cm
List of fishes: Rhinogobius brunneus, Rhodeus uyekii MORI, Gymnogobius urotaenia, Silurus asotus, Mauremys reevesii (Gray), Semisulcospira libertina (Gould)
List of plants: Ceratophyllum demersum L., Acorus gramineus, Pteridium aquilinum, Hydrocotyle sibthorpioides Lam., moss
Description of decorations: Sand, gravel, stones, and water plants were collected from the area. I bought and used soil similar to mud flowing from the mountain to the stream.
Description of equipment: EHEIM professionel 3 1200XL(2080) external-filter*1, Amazon HW-603 subfilter*2, 30W LED전구(6000K)*3, SPARKZOO RAPTISPA Sun-lamp(UVB&UBA)*1
Water parameters: Temperature (summer-32°C, winter-19°C), pH 7.5, gH 8-12
Additional info: Exchange 20% of water per week. Clean the subfilter once every two weeks.


Description of the area surrounding the biotope: The stream flows south of Korea and flows down from a small stream in the mountains into a wide river (about 101km long and 1,421km2 of basin area). Observation areas have slow flow rates and form pools. When it rains, soil enters the mountains, causing dust whenever fish swim. Near the bank where the water falls, there is a high amount of dissolved oxygen, so there are a lot of living things.
Description of the underwater landscape of the biotope: The stream, which is densely wooded in the mountains, is mostly made of round stones. The upper part of the bank has high dissolved oxygen and large stones, and the water is clear compared to the lower part of the lower part. The mud was swept away from the mountains, mixed with sand and soil, and when fish swam, the soil spread and was rather turbid. In areas where the sun shines well due to lack of shade, water plants and moss grow. The water pool is stacked with fallen leaves and broken trees.
Description of the parameters of the habitat: The water is clean, but it has turbidity. The average water temperature is 24°C in summer and 8°C in winter. pH is 8 and dissolved oxygen is 9 mg/L in summer and 12 mg/L in winter.
List of fishes and invertebrates occurring in the nature biotope: Rhinogobius brunneus, Gymnogobius urotaenia, Moroco oxycephalus, Zacco temmincki, Zacco platypus, Barbatula toni, Cottus poecilopterus, Silurus asotus, Silurus microdorsalis, Rhodeus uyekii MORI, Rhodeus notatus, Mauremys reevesii (Gray), Neocardina denticulata, Semisulcospira libertina (Gould), Cambaroides similes, Rana dybowskii
List of plants found in the nature biotope: Ceratophyllum demersum L., Hydrilla verticillata (L.f.) Royle, Vallisneria natans (Lour.) H.Hara., Acorus gramineus, Pteridium aquilinum, Hydrocotyle sibthorpioides Lam., moss
Threats to the ecology: ‘Mauremys reevesii’ is a freshwater turtle representing Korea along with the ‘Trionyx sinensis’, which was common in the past, but is now protected as a second-class endangered wildlife by the Ministry of Environment due to overfishing for food and medicinal use and worsening habitat conditions. In particular, foreign species such as red-eared turtles and bull frogs are threatening the survival of ‘Mauremys reevesii’ (because of the indiscriminate release of the species in the past), and China, which is native to Korea, is also in serious danger of extinction.
(The turtle I’m raising is a cultivated turtle and has no legal problem.)
Sources of information:

Comments of the members of the jury of Biotope Aquarium Design Contest 2020