Similarly, on the Map of the Hydrographic Division of Poland from October 2007 made by the Department of Hydrography and Morphology of the River Troughs IMGW on the order of the Minister of Environment of the Republic of Poland, the fistula appears under the name Błotnica.

On some map this thud appears under the name Resko Canal.

The other species of fish found in Błotnica and lake Tenement are: weave, white-fin head, thorn, roach, bream, European eel, European perch, pike.

In 2006, an assessment of the quality of the waters at the bridge near the village of Nowogardek was carried out at 4 km from the mouth of the river, where the waters of the river were assessed as 3rd class quality, In 2008, quality studies of mudguard waters were conducted at the estuary point to the Sea Ruska.

The overall two-stage assessment found that the waters of the Mudguard were poor In 2011, a water quality assessment was carried out at the test and measurement point at the estuary to the Nautical Site, where the good potential of biological elements, the good potential of physic-chemical and hydro morphological elements and good ecological potential were assessed.