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Marine Biology

, Volume 151, Issue 2, pp 629–638 | Cite as

Age, growth and population structure of Modiolus barbatus from the Adriatic

  • M. Peharda
  • C. A. Richardson
  • I. Mladineo
  • S. Šestanović
  • Z. Popović
  • J. Bolotin
  • N. Vrgoč
Research Article

Abstract

Age, growth and population structure of Modiolus barbatus from Mali Ston Bay, Croatia were determined using modal size (age) classes in length frequency distributions, annual pallial line scars on the inner shell surface, internal annual growth lines in shell sections of the middle nacreous layer and Calcein marked and transplanted mussels. The length frequency distributions indicated that M. barbatus attain a length of ∼40 mm in 5–6 years indicating that a large proportion of the population in Mali Ston Bay is <5 years old. Some mussels of ∼60 mm were predicted to be 14 years old using the Von Bertalanffy growth (VBG) equation. Up to the first 6 pallial line scars were visible in young (<6 years) mussels but in older shells the first scars became obscured by nacre deposition as the mussel increased in length and age. The age of the older shells (>6 years) was determined from the middle nacreous lines in shell section, which formed annually in winter between February and March; the wider dark increments forming during summer (June to September). The oldest mussel, determined from the middle nacreous lines, was >12 years, with the majority of mussels aged between 3 and 6 years of age. The ages of mussels ascertained using the growth lines were not dissimilar to the ages predicted from the length frequency distributions. Age at length curves produced using modal size class data were not different from the data obtained using the pallial scar rings and internal growth lines. Taken together these data suggest that M. barbatus attains a length of 40 and 50 mm within 5 and 8 years, respectively. Eighty one percent of individual M. barbatus injected with a Calcein seawater solution (300 mg Calcein l−1), into their mantle cavity successfully deposited a fluorescent line, which was visible in suitably prepared shell sections under ultra violet light. Incorporation of Calcein into the mussel shells was seasonally variable with the lowest frequency of incorporation in mussels marked in February and recovered in May. Seasonal shell growth was observed with significantly higher growth rates in mussels marked in May and removed in August (ANCOVA, F3,149 = 23.11, P < 0.001). Mussels (∼18 to 22 mm) marked in May and recovered in August displayed maximal growth rates of >2.5 mm month−1 compared with a mean mussel growth rate of 1.2 ± 0.6 mm month−1. At other times of the year mussel shell growth ranged from immeasurable to 1.48 mm month−1.

Keywords

Calcein Growth Line Shell Growth Mussel Shell Length Frequency Distribution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This research was financed by the Croatian Ministry of Science and Technology. The authors are grateful to Željko Baće, Marko Žarić, Nika Stragličić, Lovorka Kekez and Mark Prime for technical assistance. Special thanks to Barbara Zorica for help with statistical analysis and Professor C.D. McQuaid for helpful suggestions for Calcein marking the mussel shells. The experiments conducted comply with the current laws of Republic of Croatia.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • M. Peharda
    • 1
  • C. A. Richardson
    • 2
  • I. Mladineo
    • 1
  • S. Šestanović
    • 1
  • Z. Popović
    • 1
  • J. Bolotin
    • 3
  • N. Vrgoč
    • 1
  1. 1.Institute of Oceanography and FisheriesSplitCroatia
  2. 2.School of Ocean ScienceUniversity of Wales – BangorAngleseyUK
  3. 3.Institute for Marine and Coastal ResearchUniversity of DubrovnikDubrovnikCroatia

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