Stručni rad
RESULTS OF A 5-YEAR STUDY OF CAGE-CULTURE OF SHEAT FISH (SILURUS GLANIS) IN LAKE MODRAC
Ivan Stević
; Poljoprivredni fakultet, Osijek
Ivan Bogut
; Poljoprivredni školski centar, Osijek
Anđelko Opačak
; Poljoprivredni fakultet, Osijek
Sažetak
Presented are the results of a 5-year study and the problems of cage-culture of the sheat fish in the hydroaccumulation Modrac. The lake has a surface area of about 1700 ha, a depth of 18 m, and was created by the building of dams on the river Spreča near Tuzla. Physico-chemical water parameters varied in acceptable limits, except in the first year of culture, when because of a sudden lowering of temperatures water inversion occurred, which caused a drastic oxygen decrease and death of the fish. Depending on the water temperature the feeding period for the fish ranged from 155 to 174 days. Differing from the culture on fish farms the feeding lasted from mid-May to mid-October. The stock density in cages was 9-32 per/m3, and stock weight from 2.35 to 6.39 kg/m3. The total growth rate of fish per m3 varied between 2.77 to 5.83 grams. This kind of modest production results is due to a range of problems which occurred during the culture, the most significant being unsatisfactory food and not enough quality fry.
Fish losses ranged from 1.54 to 34.1%, and came about due to the ichtyophirosis, cannibalism, asphyxiation and because of fish escaping from the cages after damage to the nets from rats and otters. Despite high losses and a lower growth rate than on the fish farms, the production of the sheat fish in cages, because of the quality of meat and export to the western market, ensures an economic rentability.
Ključne riječi
Hrčak ID:
70554
URI
Datum izdavanja:
29.6.1993.
Posjeta: 2.303 *