DIURNAL UPTAKE OF AMINO ACiDS IN I,AKE BALATON, KOROS BACKWATER RESERVOIR AND "'QUID MANURE FERTIl.IZED FISH POND (IIUNGAHY).

DIURNAL UPTAKE OF AMINO ACiDS IN I,AKE BALATON,
KOROS BACKWATER RESERVOIR AND “‘QUID MANURE
FERTIl.IZED FISH POND (IIUNGAHY).
WAGDY M. EL-SARRAF
National Institute of Oceanography and Fisheries, Anfoushy, A’ex .• Egypt.
AnSTRACT
The importance of organic matter utilization in
naturai waters was indIcated by measuring heterotrophic
activity. Amino acids are important as a source of
organi c nitrogen for heterotrophi c bacteria. The
diurnal uptake of amino acid was measured in situ.
with sing’e concentration, in three aquatic bodies
with different degrees of eutrophication, Keszthely
basin in Lake Balaton, Koros backwater reservoir.
and liquid manure fertilized fish pond. Also
physicochemical parameters and bacterial numbers
were examined. Diurnal uptake of some amino acids
was characterized by dramatic changes of velocity
(increase or decrease) in the three ecosustems
examined, associated with irregular fluctuations
in bacteria’ numbers. The heterotrophic potential
was affected by I ight and, dar~ periods of the day.
Results obtained in Lake Balaton were the lowest.
Mean incorporation rate of amino acids was 2.072
~g dm- 3 h- 1. Mean incorporation rates of the same
amino acids in Koros backwater reservoir and liquid
manure fertilized fish pond were 8.83 and 8.872 Ilg
dm- 3 h- 1 • respectively. Incorporation rate, measured
with short-term interval incubation. was greatly
increased afternoon and earlY morning in Koros
backwater reservoir. whi Ie One peak appeared during
midnight in liquid manure fertilized fish pond. In
Lake Balaton. peaks were recorded with different
trends for amion acids.