SVIBOR - Project code: 1-08-334


Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69


SVIBOR - Collecting Data on Projects in Croatia

Project code: 1-08-334


Main researcher: ERBEN, RADOVAN (11296)

Type of research: applied
Duration from: 09/29/93.

Papers on project (total): 58
Papers on project quoted in Current Contents: 4
Institution name: Prirodoslovno-matematički fakultet, Prirodoslovni odjeli, Zagreb (119)
Department/Institute: Department of Zoology
Address: Rooseveltov trg 6
City: 10000 - Zagreb, Croatia
Phone: 385 (0) 1 442 604
Phone: 385 (0) 1 442 607
Fax: 385 (0) 1 45 52 645
Phone: 385 (0) 1 442 804

Summary: In controled waters in fishpond Draganići we started with cultivation of autochthonous crayfish Astacus astacus by putting 6500 larvae in the pond with the aim of repopulation of natural waters of Croatia. Aquaculture takes it for granted that habitat is prepared for optimal survival ofcrayfish: water temperature about 20 degrees C, pH=7,8, water hardness 158 Dh, disolved oxygen concentration between 5-6 mg/l, sanitary control of the water and adequate natural and artificial food. The same species and invertebrates from the natural habitats were used as test organisms in laboratory in order to establish water quality of those habitats. Special atention was given to crab diseases caused by viruses, bacteria, parasites and fungi as well as to their timely detection and cure. That is why sanitary water control was continously carried out as well as histopathological analyses of tissues and all organs (especially of hepatopancreas and gonads) of cultivated animals and those cought from among the few populations in natural waters. Apart from these analyses, enzymatic and biochemical analyses were also carried out with the aim of establishing physiological condition of the animals. In controlled laboratory conditions mortality of all crayfish of all ages was followed after their being influenced by various pollutants that have perilous consequences for environment. The results made it possible: a) polycultural cultivation, crayfish-fishes, which allows competitive relationship, b) reintroduction of crayfish in natural habitats and monitoring of dynamics of population and c) timely intervention in the case of diseases appearance, be it in intensive cultivation or in natural waters.

Keywords: crayfish Astacus astacus, pond system, repopulation, histopathology, water quality control, pollution awareness, forage management, test organisms, aquatic toxicity tests

Research goals: The aim of the proposed research and expected yield. The prospects of the development of aquaculture in the first place the cultivation of crayfish in our country and in the world are the following: Planning of possible capacities of cultivation and preventing crayfish from devastation (crayfish is one of the most threatened freshwater representatives) from existing water ecosystems. Along with crayfish breading chosen species of fish in polyculture should be bread as well in accordance with competition in and the quality of the water (carp). To solve the problems of crayfish larvae cultivation in the sense of the development of methodology, especially the time spend with mother leading to independent life and the beginning of teritorial behaviour. The choosing of adequately composed food for separate stages of the development of life cycle. By using preventive measures to prevent and cure possible diseases of organisms in intensive cultivation. To use economically the capacity of hatching grounds in polyculture by cultivating larval stages of different species of fish together with the cultivation of crayfish larvae in accordance with their spawning time. To follow the level of pollution in the aquaculture and possible accumulation in organisms. Proposal of the improvement of cultivation by using new technological solutions in the proces of cultivation (the improvement of hatching ground conditions, selection of adequate habitats and food, control of the population density, age structure and relationship of sexes, genetics, physico-chemical characteristics of the water etc.). To insure satisfactory number of the animals which, owing to their biological characteristics, can exist in natural waters. Reintroduction of autochthonous species in the waters of Croatia, the preservation of these species as well as monitoring of their adaptation in the conditions of natural environment. Results of laboratory histopathological analyses were used in the prevention of the diseases and also in the prevention of the spreading of infectious diseases in autochthounous crayfish populations in natural waters and in the intensive cultivation in mono and polyculture. Listing of subchronical, chronical and lethal concentrations of possible polutants in natural waters and aquaculture. For water quality tests in natural habitats apart from Astacus astacus other aquatic invertebrates were used.


  1. Name of project: sponzor projekta s pokusnim bazenima i mrijestilištem
    Name of institution: Ribnjačarstvo Draganići
    City: Draganići, HR


  1. Name of institution: Zavod za ribištvo
    Type of institution: State institute
    Type of cooperation: Systematic exchange of information
    City: 61000 - Ljubljana, SLO

  2. Name of institution: Dipartimento di Scienze della Produzione Animale
    Type of institution: University/Faculty
    Type of cooperation: Systematic exchange of experts
    City: Udine, I

  3. Name of institution: Dipartimento di Biologia
    Type of institution: University/Faculty
    Type of cooperation: Occasional exchange of experts
    City: Trieste, I

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Last update: 10/09/95