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.
Also, these species are best kept in groups, not pairs. The water in Lake Victoria is much less clear than that in Lakes Malawi and Tanganyika. Transparency has been measured between less than 4 and 10 feet in inshore areas. The pH is alkaline, ranging from 7.2 to 8.6, and carbonate hardness is between 2 and 8 dH.