Age, growth and condition index of Ruditapes decussatus (Linnaeus, 1758) in the eastern Adriatic Sea (CROSBI ID 575463)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa
Podaci o odgovornosti
Bušelić, Ivana ; Jurić, Ivana ; Ezgeta-Balić, Daria ; Mudnić, Vinko ; Vrgoč, Nedo ; Peharda, Melita
engleski
Age, growth and condition index of Ruditapes decussatus (Linnaeus, 1758) in the eastern Adriatic Sea
Age, growth and condition index of commercially important grooved carpet shell Ruditapes decussatus (Linnaeus, 1758) were studied in Pag Bay - one of the most important harvesting locations in the eastern Adriatic Sea. Samples were collected monthly from commercial catch in a period from January to November 2007. Age and growth were determined from internal growth bands of 135 shells ranging in length from 17.72 to 43.46 mm (mean±st.dev=29.39±5.53 mm). Growth rings were not visible in 5% of analysed specimens and these were omitted from further analysis. Marginal increment analysis performed on 68 shells (26.43±3.39 mm) confirmed that growth bands are annual and are formed in February. Condition index as indicator of reproduction cycle was determined monthly on 30 specimens (33.90±1.63 mm). Maximal value of condition index was recorded in April. Formation of growth bands corresponded to a period of slow growth which was recorded prior to the increase of condition index, indicating that during that period R. desussatus invests more in tissue biomass than in shell deposition. In order to ascertain growth parameters, distance from the umbo to the each visible growth ring was measured and Gulland – Holt plot was constructed. Obtained modified von Bertalanffy equation describing shell length growth was: Lt=38.73(1-e^-0.52(t-t0). Majority of analysed specimens were two years old and the oldest specimens analysed in this study had six years. In conclusion, age and growth data suggest that R. decussatus is a short – living species with the most intensive growth occurring during the first two years.
age ; growth ; Ruditapes decussatus ; condition index
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Podaci o prilogu
72-72.
2011.
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objavljeno
Podaci o matičnoj publikaciji
Book of abstract from 46th European Marine Biology Symposium
Travizi, Ana ; Iveša, Ljiljana ; Fafanđel, Maja
Rovinj: Institute Ruđer Bošković
Podaci o skupu
46th European marine Biology Symposium
poster
12.09.2011-16.09.2011
Rovinj, Hrvatska