Description

This article is from the ReefKeepers FAQ, by several authors (see the Credits section).

5.4 Shelled things

a Clams

          Tridacna Maxima (expensive)
                       Purple, blue, green, pink, or combination.
                       cdf=3, fll=5-9, dff <18, mhl=1-7, dfm= >8
                       wcu=1-5, hac=5, fod=sym, add=cal/str
          Tridacna crocea
                       Purple, blue, green, or combination.
                       cdf=5, fll=5-9, dff <6 mhl=1-7, dfm= >5
                       wcu=1-5, hac=5, fod=sym, add=cal/str
          Tridacna squamosa
                       brown, yellow, usually with green rim, black and red??.
                       cdf=3, fll=5-9, dff <18, mhl=1-7, dfm= >5
                       wcu=1-5, hac=5, fod=sym, add=cal/str
          Tridacna derasa
                       brown, sometimes with green strips.
                       cdf=1, fll=5-9, dff <18, mhl=1-7, dfm= >5
                       wcu=1-5, hac=5, fod=sym, add=cal/str
          Tridacna gigas 
                       almost always brown with tiny blue dots,
                       very rarely green, blue or combination.
                       cdf=3, fll=5-9, dff <18, mhl=1-7, dfm= >5
                       wcu=1-5, hac=5, fod=sym, add=cal/str
	  Hippopus hippopus
		Very light cream-color mantle with many short tan
		lines.  Shell is lighter in color and much smoother
		than Tridacna clams.  I believe the H.h clams are
                at least as hardy has the hardy T. clams.  They are also 
		supposed to be tank-raised.  They are certainly the 
		cheapest costing at most 1/3 to 1/2 that of a similiar-sized 
		Tridacna (excepting derasa which are almost as cheap).
		The mantle of Hippopus sp clams does not extend beyond
		the shell as it does in Tridacna sp (Delbeek).

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