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The autecology of the edible oyster Crassostrea cucullata Born, 1778: size related vertical distribution at Mkomani, Mombasa
Okemwa, E. N.; Ruwa, R. K.; Polk, P. (1986). The autecology of the edible oyster Crassostrea cucullata Born, 1778: size related vertical distribution at Mkomani, Mombasa. Kenya J. Sci. (B Biol. Sci.) 7(2): 9-14
In: Kenya journal of sciences. Series B. Biological sciences. Kenya National Academy for Advancement of Arts and Sciences: Nairobi. ISSN 0250-8265, more
Peer reviewed article  

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Keywords
    Saccostrea cucullata (Born, 1778) [WoRMS]; Marine

Authors  Top 
  • Okemwa, E. N.
  • Ruwa, R. K., more
  • Polk, P.

Abstract
    The littoral oyster Crassostrea cucullata occurs between 1.05-3.35 m above chart datum with the highest density occuring between 1.85-2.75m. Its distribution is size-related as demonstrated by computation of correlation coefficients (r) and regression equations. The shell lengths (i.e. maximum linear dimension) decreases in an upshore direction. The analysis show high r-values which are significant at p<0.001. The equations and the r values are as follows: 1. for the lower level oysters between 1-1.85 m: y = 43.64-6.49 x, r = -0.659;2. for the mid-level oysters between 1.86-2.75 m: y = 62.67-17.14 x, r = -0.941; and 3. for the high level oysters between 2.76- 3.35 m: y = 91.44-24.85 x, r = -0.899; where y stands for the mean shell length (mm) and x is the mean height (m) above datum. The elevation and density related effects on the shell lengths of the oysters are discussed.

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