LONG-TERM PRAXIS OF FISHERY MANAGEMENT OF LAKE VÕRTSJÄRV AIN JÄRVALT Centre for Limnology Institute of Agriculture and Environmental Sciences Estonian.

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Presentation transcript:

LONG-TERM PRAXIS OF FISHERY MANAGEMENT OF LAKE VÕRTSJÄRV AIN JÄRVALT Centre for Limnology Institute of Agriculture and Environmental Sciences Estonian University of Life Sciences

LAKE VÕRTSJÄRV 270 km 2, shallow (mean depth 2,8 m), eutrophic lake 32 native fish species Main commercial species: eel, pikeperch, pike, bream, perch Total catch 350 t or 13 kg/ha ( t, 18 kg/ha) Only passiv gears - trap or fyke net 324, gillnet trap net per 83 ha and 1 gill-net per 75 ha

Peculiarities of fishery L. Võrtsjärv Water level changes Native fish species Eel stocking - annual investments EUROs Main problem: Balance between sustainable catch of native fish species (pikeperch, pike) and maximal catch of eel (changes according to EMP since 2008)

Fishery management of Lake Võrtsjärv since 1920

Management in 2008 State waterbody Responsible manager - Ministery of Environment and Ministery of Agriculture 46 professional fishermen (2008) –324 fyke nets (length 150 m), annual tax 300 EUROs per fyke net (100% for restocking of eel) –360 gill nets (min mesh size 65 mm), 20 EUROs per net –by the historical right (mean number of gears during last 3 years) low recreational fishing annual state support for restocking of eel –in up to EUROs per year, since 2007 = 0 Cost of total annual catch – 0,5-0,6 million EUR (2 EUR/ha)

Total number of professional fishermen in Lake Võrtsjärv

Average annual catch of main fish species in L. Võrtsjärv

Stocking of eel Anguilla anguilla annual investments EUROs glass eels (7 cm, 0,3 g) since 50s farmed eels (15 cm, 5 g) 1988, 1995, since 2002

The stocking and catch of eel in L. Võrtsjärv

Class-eels Klaasangerjad

Restocking of farmed eels into Lake Võrtsjärv in 2006

PIKEPERCH Legal size 45 cm (SL), 51 cm (TL) >1,3 kg

The commercial catch ( t ) of pikeperch and CPUE (kg per trawl/hour) in Lake Võrtsjärves

The commercial catch ( t ) of pike and CPUE (kg per trawl/hour) in Lake Võrtsjärves

Winter gill net catch - divides activities and incomes of fishermen 90 % of total –pikeperch –pike second-rate abundant –bream and burbot

Main problems connected of fishery caused by hypoxia in L. Võrtsjärv Decrease of moving activity –lower winter catches (pikeperch and pike) Fishkill Disturbing the overwintering of eel –emigration –easy prey for pike

Foto: A. Tuvikene THANK YOU !