Definition. A fibroblast is a cell that manufactures and maintains connective tissue, the structural framework that supports the organs of all animals. Fibroblasts secrete fibrous proteins and ground substance, which together form the extracellular matrix that is the basis of connective tissue. fibroblast is a cell that manufactures and maintains connective tissue, the structural framework that supports the organs of all animals.
Therefore, there is very little chlorophyll in these tropical waters, keeping them clear. (As an aside, corals are symbioses where phytoplankton have evolved to survive in nutrient-poor tropical waters by living inside the bodies of the corals and obtaining nutrients directly from the waste products of the corals.
I have been to many of the Carribean beaches like Martinique and Turks Caicos and have to tell you that in my opinion the sand is not as white and the water not as turquoise and clear here as you are going to find in the beaches of the Carribean Sea and the Gulf of Mexico ( Clearwater / Marco etc).