EXPERIMENTAL HISTOTOXICOLOGICAL INVESTIGATIONS OF FISH POISONING
Main researcher
: KOZARIĆ, ZVONIMIR (95893) Assistants
KEZIĆ, NIKOLA (20862)
SREBOČAN, EMIL (101566)
NOVAK, RENATA (177510)
Type of research: basic Duration from: 01/01/91. to 12/31/95. Papers on project (total): 0
Institution name: Veterinarski fakultet, Zagreb (53) Department/Institute: Department of anatomy, histology and embryology Address: Heinzelova 55, 385 (0) 41 29 02 45 City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (0)41 290 245
Phone: 385 (0)41 205 825 home
Summary: Investigation will be carried out on the carps (Cyprinus
carpio L.). Experimental part of the investigations will be done in glass
aquaria with dechlorinated tape water physical and chemical characteristics
of which are exactly known. The effects of various toxic supstances (haevy
metals, agrochemicals, industrial chemicals) on fish will be observed under
acute and chronic exposure to chemicals. During each experiment a control
group of fishes will be established. Histological methods will be used for
examination of changes in in the organs and tissue structure after the fish
is exposed to the toxic supstances. The histopathological changes of toxic
supstances will be examined on various organs, particularly on the gills,
liver, kidney and brain. Histochemical methods will be used for
determination of enzymes' activity as well as glycogen and lipid amount in
the fish organs and tissue. The investigating enzymes include the enzymes
of glucose metabolism (glucose-6-phosphatase, glucose-6-phosphate
dehydrogenase, lactic acid dehydrogenase and hexokinase) and the enzymes of
citric acid cycle which included succinic acid dehydrogenase, isocitric
acid dehydrogenase and beta-hydroxybutyric acid dehydrogenase. In some
cases, when it is important, activity of the other enzymes will be involved
in the investigations. Except above-mentioned enzymes some of hydrolytic
enzymes (alkaline and acid phosphatase, non-specific esterase and ATP-ase)
which are involved in transport across cell membranes or in the
intracellular demolishing processes will be included in investigations.
Using the analytic methods the distribution of toxic supstances and their
metabolites in organs and tissue will be determined. The above-mentioned
methods include AAS, HPCL and ELISA.
Research goals: The mentioned investigations will be carried out in
two ways. In the first period, the effect of toxic supstances on the
structure and metabolism of carps organs will be investigated with
described methods under experimental conditions with the exactly determined
concentrations of toxicants. As the experiment will be carried out in the
strictly experimental conditions, where all relevant parameters are known,
the obtained results will point at the specific changes in the structure
and metabolism of particular organs of carps. These results could
contribute to understanding the mechanism of toxic action. On the other
hand, the results of mentioned investigations will be improved
histopathological diagnose of poisoning with particular toxic supstance. As
there are few data about this in the scientific reports, the results of
this part of investigation represent a significant contribution to
ecotoxicology. In the second part of the investigations, which will be
carried out parallely with the above-mentioned investigations, is the
investigation of dissemination of the particular histopathological changes
in the organs of the fish from Adriatic sea. These investigations are the
part of general pathology of the marine animals. As we consider these
observations to be very important as serious developmental programs for
fishery as well as the increase of fish population are not possible if we
are not acquinted with presen pathology and possible causes of this
pathology. Every such attempt on a particular area of Adriatic sea will not
give successful results without former investigations. The samples for
these investigations will be taken during the fishing in particular area.
Preliminary investigations have been done on the fish caught in the
vicinity of Primošten and neighboring islands. Other information about the project.