CARP ADVANCED FRY POND WATER OXYGEN AND BOD5 DYNAMICS

CARP ADVANCED FRY POND WATER OXYGEN AND BOD5 DYNAMICSDownload file(Article is in Croatian)original scientific paper
CARP ADVANCED FRY POND WATER OXYGEN AND BOD5 DYNAMICSDebeljak, L.Keywords:
carp advanced fry pondsoxygen quantitybod5

Volume: 56
Issue: 4
Pages: 131 - 142

Summary

Changes and dynamics of Oxygen and BOD5 quantity in 3 carp advanced fry ponds of 8-10 ha-1 was examined during 6 growing seasons (from 1990 to 1995). Carp fry was grown semiintensely cultured with 3 days old carp larvae in amount of 200.000 ind ha-1.Oxygen quantity inadvanced fry ponds during growing seasons varied from min. 1.9 mg l-1 to 12.48 mg l-1, and saturation with O2 from min 22% to 142 %.BOD5 varied within the amplitude of min 0.37 mg 02 l-1 to max. 9.93 mg 02 l-1.The average oxygen quantity dissolved in advanced fry ponds water compared to the average oxygen quantity in the inflowing water was 2% to 43% lower. There has been a significant decrease (p<0.05) in August and September, totalling 37%. to 43%.In all the advanced fry ponds there has been a significant increase of BOD5 (p<0.05). Compared to inflow water the average BOD5 increase in advanced fry ponds was 200% to 350%.