This study was carried out during two years study from oct. 2005. To sep. 2007 in Bahrekan coastal waters in Northwest of Persian Gulf. Sampling was done from 5 station (4 station in artificial reef site and one station in muddy soft bottom area as a control site). Monthly sampling was done for water, phytoplankton, zooplanktons and Ichtyoplankton fauna and seasonal sampling for benthos, attached benthic animals on reefs and also for fish seasonally. Except for nitrate the mean values of all the physical and chemical parameters didn t show any significant differences between artificial reef stations and control site. Although there were significant differences in some parameters such as salinity, total hardness and po4 3- during two years study. Phytoplankton including 30 genus, and Cheatoceros, Eucompia, Lauderia, from diatoms were the most abundant genus. No significant differences were observed in abundant phytoplankton in two years study. The range of chlorophyll was 0.19- 1.25 (mg/m^3 chl). Values showed variations during two years study and the lowest values in spring and the highest values in autumn were observed. Zooplankton groups were included to crustacean, mollusk larvae, polychaet larvae, protozoa and few numbers of echinodermata larvae, cheatognatha and larvacea. The most abundant zooplankton were copepoda with 81% intwo years study. Copepods were observed with 81 and 71 percent in control and reef site respectively. Zooplankton density in summer and autumn was high than other seasons. Diversity index in reef stations were more than control site and echinodermat larvae were observed only in reef site. Diversity in the first year of study were found more than in the second year of study. Fish larvae in different months were showed same variations in control and reef sites and fish larval abundance in reef stations were more than control site. Soleidae larvae in the first year of study and sparidae larvae in the second year of study were the most abundant fish larvae in area. Other fish larval families were found more abundant in reef stations than control site. Fish larvae were observed more abundant in spring and autumn than summer and winter. 16 and 34 taxa of macrobentos were identified in the first and second year of study respectively. The most dominant groups were bivalue, echinodermata, polychaets and crustacean. Macrobetntos density showed ascending trend in reef stations. Macrobentos density and biomass in control site in the first year of study was more than the reef site, but in the second year of study increased in reef site. Generaly 14 and 74 groups of attached fauna were observed in the first and second year of study respectively, and the most dominant groups were barnacles, anthozoa, spongs, bryozoans, echinodermata, isopoda, polychaets and gastropods. 42 species of decapods crustacean and coelenterate only in reef site and 12 species of mollusk only in control site were observed. 18 species were common between two sites. Biomass variations were observed in different seasons and the highest biomass were found in winter due to barnacle abundance. 16 species of fish were identified and some small ornamental fishes observed in artificial reefs. Sparidae species were the most divers and serranidae species were most abundant in area. The number of economic fish species and individuals. Showed ascending trend in reef site but sever decreasing were observed in summer 2007. This species were much more in mixed reef site (c). The major caught species in reef site were Epinephelus coioides, Acanthpagrus latus, Diagrama pictum and Sepia sp.. The mean weight of Epinephelus coioides in first year of study were more than second year. The number of fish species and caught weight in mixed reef site (c) were more than other stations in two year study. And Epinephelus coioides were the most.
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