color of marine invert light blue

Cuttlefish

more than 20 cm; near 20°c;
species: clams;
color of marine invert: light blue;
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Strombus

5-10 cm; near 25°c;
species: clams;
color of marine invert: light blue;
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Tridacna

more than 20 cm; near 25°c;
species: clams;
color of marine invert: blue, purple, light blue, grey, transparent;
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