Rezumatul tezei de doctorat - USAMV Cluj-Napoca

Coker. Fifty percent per year losses have also been reported in elver (Anguilla anguilla)
culture in Japan. In Scotland, saprolegniasis causes important economic losses especially in
salmon fisheries.
In the southeastern of United States, major losses of 50% occur in channel catfish
farming, and the economic loss of 40 million dollars. Every year, the channel catfish
farmers, from United States, have losses of more than 25 million dollars caused by aquatic
diseases.
In Europe, the cyprinid species losses percentage is more than 25%, in the areals
where over the predisposing factors, represented by overpopulation, bad manipulation of the
fish, reproduction stress caused by corticosteroid hormone excess, associated infection
(Jeney and al., 1995), there are cumulating the water and air pollution factors. Losses
between 50 and 100% at spawns, and between 14% up to 30% at larvae and alevins,
between 10 and 15% at young fish are signaled by different authors (Horvath and al., 2005).
Taking in consideration the International and European situation, we observed in our
research areal important losses caused by saprolegniasis (table 4).
Location
Spawns in
hatching
period
The percentage of losses caused by saprolegniasis
at carp species in the studied locations (%)
Larvae Alevins Young
fish
Adults
Table 4
Winter Spring Summer Autumn
Ariniş 70 30 5 3 4 5 5 3
Motiş 40 20 7 5 3 2 3 3
Adrian 58 25 10 5 8 6 6 5
łaga 60 28 10 8 9 5 4 4
Ciurila 30 10 5 5 7 5 4 3
Chiochiş 30 12 10 5 10 6 5 4
Daia 25 15 5 3 5 3 3 3
Iernut 50 25 13 10 10 7 5 5
Cefa 20 5 5 2 3 4 4 4
Ineu 28 7 6 3 4 3 4 3
Average on
total
locations
41,1 16,7 7,6 4,9 6,3 4,6 4,3 4,1
70