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STATE OF STRESS IN FISH POPULATION IN CULTIVATION CENTRES - CAUSES AND CONSEQUENCES

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Author(s): Ljubomir Kajgana

Journal: Ribarstvo : Croatian Journal of Fisheries
ISSN 1330-061X

Volume: 57;
Issue: 1;
Start page: 37;
Date: 1999;
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Keywords: stress | wild fish | water chemistry | water plants | fish growth | polyculture | technological interventions

ABSTRACT
By placing the term of stress in the centre of our attention, we wanted to warn of problems and failures that caused decrease in growth, high perish rate and high food conversion. With more professional and scientific engagement necessary optimal technological terms would be met and actions would be taken to stop production decrease, establish stabilization and crate conditions for production revival. After that one could think of ways and possibilities of further intensification and sequence of procedures in order to achieve this. Water brought into ponds is more and more polluted; very adaptable wild fish develops in it and enters the fishponds. This fish causes the decrease of growth and transmits the diseases and parasites. Due to thin plantations and monoculture water plants develop. They also cause the decrease of growth, and their decay causes deterioration of the environment for the fish-fry and food utilization level. Except for the usual intervention standards, spring lime and dunging were skipped so that green and bluegreen algae appear and turn the fishponds into pools and non-productive ponds. By market opening conditions for polyculture are being introduced, production and growth conditions as well as production stabilization are being improved. Through work organization conditions for meeting optimal technological interventions are created which are basic for every biological production.
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