T9060 Status of fish stocks in Lake Võrtsjärv in 2009 and prognosis

There were estimated stocks of main commercial fishes: eel, pikeperch, pike, bream, perch and changes in abundance of non-commercial fishes in L. Võrtsjärv on the basis of experimental trawl catches and gill net catches. On the basis of tagging – recapture data migration and stocks of silver eel in Lake Võrtsjärv was estimated.
Project team: Ain Järvalt (project leader), Meelis Kask, Jüri Zirk
Contractor: Ministry of the Environment


L9060 Investigations of fishes and macrozobenthos in L. Ülemiste in connection with biomanipulation

Project team: Ain Järvalt (project leader), Henn Timm, Kristel Panksep
Contractor: AS Tallinna Vesi


T8107 Loading of biogens and dissolved organic matter (DOM) into Lake Võrtsjärv

According to the prognosis concurrently with global warming the rate of fluctuation in the runoff of rivers is increasing. In order to calculate the exact loading of different matters there is need to do extra analysis. It is not enough to consider only the monitoring data taken once per month. We sampled more frequently than were taken the monitoring samples, especially during the high-water-level time. Our investigation is the bases for prognosis of the P, N, Si, DOM loadings into the second biggest lake of Estonia along different hydrological conditions. The result of our investigation is a data base which concord with the monitoring data from the same sites. We passed the database to the Estonian Environment Information Centre of the Ministry of the Environment in October 2009.

Project team: Sirje Vilbaste (project leader), Kairi Käiro, Peeter Pall, Kai Piirsoo, Malle Viik,.
Contractor: Environmental Investment Centre


T9071 Study on the fisheries of Estonian small still waters 2009

The project started in 1996 is goaled to survey the state of Estonian still freshwater fisheries for recreational and professional fishing purposes. In 2009, a comparative overview was given for the occurrence of species and fishing options on waters of Obinitsa, Paunküla, Kaiavere, Vagula, Tamula, Saadjärv, Koosa, and Võhandu. Three fishing methods were applied: gill-netting with several net-types, long-lining, and fyke netting. The spawning peculiarities of more important game fish and according implementations in the ‘Fishing Regulations’ were treated (pdf.format, 117 p, 11 Tables, 75 figures, 9 photos).

Project team: Teet Krause (project leader), Anu Palm
Contractor: Ministry of the Environment


L8156 Monitoring of the inflow channel No 1 of the Baltic EPS

Project team: Rein Järvekülg (project leader), A. Tuvikene, K. Käiro, K. Piirsoo
Contractor: AS Narva Elektrijaamad