HISTOPATHOLOGICAL CHANGES IN JUVENILE CARP Cyprinus carpio L. CONTINUOUSLY EXPOSED TO HIGH NITRITE LEVELS FROM HATCHING
Michał Korwin-Kossakowski*, Teresa Ostaszewska**
*The Stanisław Sakowicz Inland Fisheries Institute in Olsztyn, Pond Fishery Department, Poland
**Warsaw Agricultural University, Poland
ABSTRACT. Carp were cultivated (from day 3 to 30 after hatching) in water with a nitrite concentration of 7 mg NO2-N dm-3. The results of histological studies confirmed pathological changes in the throat, gills, heart, blood, swim bladder, liver and kidneys. These changes mainly had an adverse impact on respiration and growth. The total length and weight of fish from water with nitrites was lower by 30 and 75%, respectively, and their survival rate was 62% (97% in the control group).
Key words: COMMON CARP (CYPRINUS CARPIO), NITRITE, HISTOPATHOLOGICAL CHANGES, INTERNAL ORGANS
CORRESPONDING AUTHOR:
Michał Korwin-Kossakowski, Instytut Rybactwa Śródlądowego, Zakład Rybactwa Stawowego Żabieniec, ul. Główna 48, 05-500 Piaseczno; Tel./Fax.: +48 (22) 756-2044;
e-mail:mkk@infish.com.pl