With the exception of families Mullidae and Tetraodontidae that were represented by two species, all fish families were represented in the collection by one species.
The analysis of the diversity indices showed that Hamata mangroves had the highest diversity index (2.24) whereas, Qula’an mangroves has the lowest value of diversity index. The number of species was also much higher in Hamata than both Qula’an and Sharm Al-Bahary as indicated by the richness values (Fig. 3). Evenness values were almost the same for Hamata and Sharm Al-Bahary (0.79 and 0.8 respectively) (Fig. 3).