| Autor: |
Kolega, Matko, Čolak, Slavica, Barić, Renata, Mejdandžić, Danijel, Vrkljan, Josip, Mustać, Bosiljka, Petani, Bruna, Župan, Ivan, Šarić, Tomislav |
| Jazyk: |
angličtina |
| Rok vydání: |
2018 |
| Předmět: |
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| Popis: |
The cymothoid isopod (Ceratothoa oestroides, Risso 1916) is protandric hermaphroditic parasite. It is parasitizing in the buccal cavity and can cause significant production losses in cage reared sea bass (Dicentrarchus labrax). Biology of this parasite is often studied in laboratory conditions, while the literature data on the biology of this parasite in farming conditions are scarce. Therefore, the aim of this study is to collect data on the biology C. oestroides in the sea bass cage farming conditions in the Adriatic Sea. The experiment was carried out at farm within 14 commercial net cages of 16 m diameter stocked with 200.000 fingerlings. Visual control of the entire population of fish in each cage was carried out consecutively between 2300 and 4700 degreedays (DD) of production. Total of 100 infected individuals were excluded at each sampling. Afterwards, biometric analyses were performed on infected fishes and on C. oestroides males and females. Sexual maturity and fecundity on C. oestroides females was determined. In addition, sea temperature were recorded daily. Fish infected with C. oestroides were found in all cages. Overall, the percentage of infection ranged from 0.19% to 2.53%. Also, mature females were found in all cages, in range from 2% to 18%. Pearson correlation coefficient showed that there was a statistically significant and moderate positive correlation between DD and length of female parasites (r = 0.512, p |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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