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Experimental farming of great mediterranean scallop(Pecten jacobaeus) in the area of Boka Kotorska Bay

Overall objective: The development of mariculture sector in Montenegro through introduction of new native species in farming process.

Main activities and results:

  • In order to estimate of abundance and diversification of shells in the BokaKotorska Bay area and collection of young scallops for farming process, during december 2016 the collection of scallops was carried out using a special fishing tool –dredge (pulling fishing gear intended exclusively for the shelling of shells). In the laboratory, shellfish was determined to the level of the species, while in the case that it was not possible to, it determine to the level of the genus.
  • A total of 12 species of shellfish from 12 families were found in Krtole (Tivat), where no living species of mediterranean scallop were found at this site, nor were any shells found.
  • Total of 18 species of bivalves from 11 families were found in Sveti Marko (Tivat), where no living species of the mediterranean scallop was found, but harmful remains of two individuals were found.
  • In Sveta Neđelja (Herceg Novi) a total of 43 species of shellfish from 21 families were found where no living species of mediterranean scallop were found at this location, but there were found shells remains of eight individuals.
  • In Kostanjica (Kotor) a total of 17 species of shellfish from 12 families were found where no living species of the mediterranean scallop were found at this location, but the shells remains of two individuals were found.
  • In Ljuta (Kotor) a total of 13 species of shellfish from 10 families were found where no living species of mediterraneanscallop were found at this site, but found were the shell residues of an individual.
  • In Kamp (Kotor) a total of 22 species of shellfish from 16 families were found where no living species of the mediterraneanscallop were found at this location, but the shells remains of two individuals were found.
  • A few individuals of Mediterranean were collected from maternal stock and set for farming near the Institute of marine biology using special farming constructions -system of plastic cage and lantern nets, while for imported individuals the quarantine was made in accordance with the regulations of the Veterinary Administration, in order to prevent our sea from some disease that shells may have where individuals stayed in for 15 days. Measurement of length, width, height and weight carried out and after marking them the individuals were set in farming constructions on 3 different farms.
  • Collectors were set at three locations followed by the collection of younger ones and placement in installations for further breeding stages. Imported individuals did not survive a very long transport and high water temperature, so mortality was around 97% due to the primarily a very long transport and lack of water during transport. The species caught from natural populations with which experimental breeding started at a farm in front of the institute are still alive and progressing, which indicates that there are conditions for the cultivation of the species Pecten jacobaeus in the Boka bay.
  • During the entire period of experimental farming of PectenJacobaeus, every month sampling for hydrographic analyses was taken).
  • Regularly monitoring of possible predator species was at shellfish farm sites carried out. So far, it has been found that the biggest problem is the type of bream (Sparus aurata). Monitoring is done monthly in two ways- through diving and underwater visual census method.
  • An analysis of the stomach contents was also performed, in order to detect predatory over Pecten Jacobaeus, as well as quantities. Samples of phytoplankton for period from beginning of project are in progress. After 24h of sedimentation, it is done qualitative and quantitative analysis of phytoplankton. Samples for phytoplankton investigation are analyzed on Leica DMI4000 B inverted microscope according to Utermöhl 1958.

The results of the experimental breeding of scallops in the Boka Kotorska Bay have shown that there is a good possibility of commercial breeding of this species. Very long period required from the collection phase of the spat to reaching a commercial size (minimum 3 years), this project has determined that individuals collected from natural populations are successfully developing at experimental sites, and the subsequent phase (the younger-spat stage of collection) will additionally point to the intensity of spawning. If it turns out that the individuals have successfully matured, we expect that during the next year young scallops will be ready for the final farming phase.

 

In order to capitalize the project and the results we received, in cooperation with the Ministry of Agriculture and rural development of Montenegro, it was agreed that the project should be continued with their partial support, which would ensure the achievement of the final stage of experimental cultivation and achievement of certain goals of the Fisheries Development Strategy 2015-2020.

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Budget:
22.473,79 €
Project beneficiary:
Institute of Marine Biology (University of Montenegro)
Duration:
15 months (09/09/2016-09/12/2017)
Type of contract:
Grant contract