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Pakistan Journal of Biological Sciences
  Year: 2006 | Volume: 9 | Issue: 5 | Page No.: 843-847
DOI: 10.3923/pjbs.2006.843.847
 
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Age, Growth and Shell Morphometrics of the Gastropod Monodonta dama (Neritidae:Prosobranchia) from the Gulf of Aqaba, Red Sea

Naim S. Ismail and Ali Z. Elkarmi

Abstract:
A total of 360 of the midlittoral gastropod Monodonta dama (Phillipi, 1848) from the rocky shores in the Gulf of Aqaba, Red Sea, were studied for age, growth and shell morphometrics. The results show that M. dama may survive for five years. The mean observed length at each of the five age cohorts was 0.605, 0.977, 1.328, 1.568 and 1.934 cm. Theoretically, using Von Bertalaffy`s and Richard`s growth formulae, the maximum length of this snail may reach 2.772 and 2.210 cm, respectively. The annual observed increase in length ranges from 0.240 to 0.372 cm. Theoretically, the increase ranges from 0.180 cm in old snails to 0.472 cm in young ones using the VBGF and from 0.134 to 0.260 cm using RGF. The relationships of the shell length to shell width, aperture length and aperture width are linear. The ratios of the shell length to shell width, aperture length and aperture width increase with age. This may indicate that this snail become more elongate with age.Moreover, the ratio of the shell width to aperture width increases with length. Shell and dry body weights averaged 705 and 475 mg, respectively. The relationships of the shell length to shell and dry body weights are curvilinear. However, the relationships of the shell length to shell width, aperture length and aperture width are linear. The relative coefficient of condition (Kn) which measures the progression of body weight and length was 0.334.
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How to cite this article:

Naim S. Ismail and Ali Z. Elkarmi , 2006. Age, Growth and Shell Morphometrics of the Gastropod Monodonta dama (Neritidae:Prosobranchia) from the Gulf of Aqaba, Red Sea. Pakistan Journal of Biological Sciences, 9: 843-847.

DOI: 10.3923/pjbs.2006.843.847

URL: https://scialert.net/abstract/?doi=pjbs.2006.843.847

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