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Evaluation of common carp (Cyprinus carpio Linnaeus, 1758) breeding in the cages located in the Caspian Sea based on its health and pathology status
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Javad Daghigh Roohi *   , Mohammad Sayad Boorani , Abdolreza Abkar , Mohaddeseh Ahmadnezhad , Monireh Faeed , Adel Hosseinjani |
| Education and Extension Organization |
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Abstract: (449 Views) |
In order to evaluate the possibility of common carp culture, Cyprinus carpio, in cages located in the Caspian Sea, 700 common carp with an average weight of 50±10 gr were introduced in two floating cages (each cage contains 350 fish) in Anzali Free Zone. The fish were fed daily based on the fish biomass on two occasions using extruded pellet food. After 2 months of introduction of fry, the loss of 2-3 fish per day started. The biometrics also showed that the fish just reached to average weight 85.64±12.07 and do not grow properly. In order to identify the reasons for the lack of proper growth and gradual death of fish, sampling was done to investigate the bacterial pathogens and the pathological condition of the gill tissue. By bacterial tests Aeromonas hydrophila from internal organs including liver and spleen and Pseudomonas sp. was isolated from the gills of investigated fish. The pathological examination of gill tissue also showed extensive histopathological effects such as bleeding, hyperplasia of the epithelium, twisting and adhesion of the secondary blades, destruction of the pillar apparatus and gill chloride cells, etc. Probably, some of these injuries are the result of infection with bacteria and others are the result of environmental conditions, especially the relatively high salinity of seawater. At the end of four months of rearing, the fish survival rate was about 30% and the average final weight was 350 ± 150 gr. In general the biological characteristics of common carp showed that although this fish is able to tolerate salinity to some extent and sometimes can be seen in the composition of sea catch, it is basically considered a freshwater fish and its cultivation in floating cages in the Caspian Sea where salinity varies between 7-13 ppt is not reasonable and economic and it is not recommended.
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| Keywords: common carp, Fish cage culture, Caspian Sea, pathology |
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Full-Text [PDF 760 kb]
(81 Downloads)
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Type of Study: Applicable |
Subject:
Special
Received: 2024/01/24 | Accepted: 2024/02/3 | Published: 2024/03/29
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