Decrease of number of localities and size of populations of Potamogeton praelongus in the Czech Republic was the reason for rescue activities. They started in the late 1990s. The main stimulus was brought by hydrobotanist Štěpán Husák from the Institute of Botany of the CAS in Třeboň (IB, CAS), where a rescue culture of P. praelongus was established in 1998. Data about this species were completed and integrated into a basic text to be used for preparation of the first version of Long-stalked pondweed Rescue Programme (RP) document. After updates, this document was ratified by the Ministry of environment of the CR in May 2003. Activities executed in the frame of the RP included protection of the species and its biotope in situ (i.e. in its original natural localities), and many activities were also carried out ex situ (a rescue culture in IB, CAS, a reserve population in the protected landscape area (PLA) of Kokořínsko, a tissue culture in the laboratory of Mr. Pásek in Ostrava, germination tests and growing experiments at University of Hradec Králové (UHK), an experimental culture in Býšť). Experimental reintroductions of the species into suitable localities with its former occurrence represent an important part of the rescue programme.
Implementation of the Rescue Programme was executed by the Nature Conservation Agency of the Czech Republic (NCA CR); in 2003–2005 by its regional office in Pardubice, in 2005–2007 by Hradec Králové regional office. Since 2007, Central office of the NCA CR in Prague (department of Nature protection) has been coordinating the RP. Main investigators of the RP are UHK, IB, CAS Třeboň and Mr. Kamil Pásek, Ostrava. Funding of activities (monitoring of populations and localities, reintroduction) provides the NCA CR. In 2009–2010 and 2015–2017, the rescue programme was supported by foreign funds (EHP/Norway). Websites provided by the NCA CR (http://www.zachranneprogramy.cz) a UHK (http://www.rdestdlouholisty.cz) continuously inform about the rescue programme.
1) Removal of sediment in the Temporarily protected area of the Orlice River Oxbow near the Stříbrný rybník pond and construction of a sedimentation reservoir on the Stříbrný Stream
2) Management of biotopes with Potamogeton praelongus
3) Rescue cultivations, in vitro cultures, gene bank
4) Selection of potential localities and planting
5) Monitoring of populations
6) Monitoring of site-specific habitat factors in the localities
7) Monitoring ofthe condition and biodiversity of the localities and plant communities
8) Popularisation of the Rescue programme and presentation of the results