Aquatic Ecology
Year:2012 | Volume:1 | Issue:3|Papers Count:6

Based on important role of mangrove forests as nursery ground for juvenile species in tropical and subtropical areas; aquatic species and their biomass were determined in Sirik mangrove forest of Hormozgan Province. For the survey, we used of trawl net to catch species in mangrove habitat, The speed and duration of putting trawl net were respectively 4.5 Km/h and 32 minutes. Images of IRS Satellite (2004) using Arc Gis 9.2 software were used for estimation the area of species distribution. Results showed that there are 13 fish species, 2 shrimp species (Penaeus indicus & Penaeus merguiensis) and one crab species (Porutnus pelagicus) in Sirik mangrove ecosystem. Families of recognized fishes were Leognatidae, Gerridae, Polynemidae, Platycephalidae, Pomacenteridae, Sparidae, Scomberidae, Soleidae, Clupeidae, Trichiuridae, Chanidae, Engraulidae and Carangidae. Also two recognized shrimps were belonged to Penaeidae family and crab family was Portunidae. The main habitat of all recognized species were open sea and they used of mangrove ecosystem for temporal habitat and completing their grows. Finally the total biomass of these species was 16.828 ton ha-1. Results showed that the biomass of two shrimps was higher than other species that shows mangrove ecosystems are the best nursery ground for juvenile shrimps.

The mean sea level is defined as the mean of total effects of tides and storm surges, and it changes under the influence of factors such as tide, storm surge, wind, atmospheric pressure changes, global warming, Coriolis effect, sea bed topography and etc. The purpose of this study is to analyze the monthly mean sea level water variations of Persian Gulf, using mean sea level data analysis in Bushehr, Bandar-Abbass and Imam Hassan port stations by a period of 10 years (1999-2008). The difference of the monthly min and max points in the abovementioned stations is 34.cm, 20cm and 30cm, respectively. The highest sea levels are reported for June, July, August, and the lowest sea level is reported for February. The most significant factor for the rise of sea level in Persian Gulf is the water thermal expansion. Consequently, as a result of thermal expansion, the sea level rise in the summer and the autumn and it decreases in the winter and the spring. According this analysis mean rate of sea level rise in Bandar-Abbass is 3 mm/year, In Bushehr 9 mm/ year and in Imam Hassan 12 mm/year Considering the data reported from Bandar-Abbass station, the sea level rise is expected by the year 2050.

An important measure of the votes of tourists in the selection, planning and design of the promenade that productivity is outing in areas with tourism potential. Origin and duration of travel was visitors to the mangrove forests, Qeshm is very large radius of visitors to this area. According to this survey, 79 percent of visitors, tourists are outside the province and most of them were long distance to reach the area. Survey respondents indicate that the number of questions referring to the pattern once a year for most visitors to the region. Enjoying the outing of high demand such as mangrove forests and sea water is required. The main reason for visitors to visit the beautiful landscape of the region’s mangrove forests has been subject. Improved methods for managing and implementing successful programs, maintenance and development of mangrove forests, Qeshm outing tourists to use behavioral patterns should be considered.

This study was designed for understanding reproductive biology of major shrimps in northeast of Qeshm island with adjacent Mangrove area. sampling was carried out monthly since March 2008 to June 2010. The analysis showed that the sex ratio was not 1:1either seasonally or annually for all species (p<0.05). The peak of spawning was obtained for P.merguiensis, M.stebbingi and P.stylifera in spring season but for Jinga shrimp (M. affinis) is able multiple spawner per year.

Forty fishes of a recently described species, Alburnoides petrubanarescui, from Orumiyeh Lake basin were investigated based on morphometric and meristic characteristics. Twenty three morphometric traits including total length, standard length, fork length, body depth and sixteen meristic traits including Dosal fin rays, Anal fin rays, Ventral fin rays, Pectoral fin rays, number of Lateral line scales and total vertebrae were surveyed. Age using annual growth circles of scales and weight were also determined. Excel 2007 and SPSS 18 were applied for statistical analyses. Pearson and spearman correlation coefficients were respectively used to determine the correlation between Morphometric and Meristic traits and also the correlation of age with standard length. Total length, standard length, fork length and body depth were 56.76±7.78 (mm), 47.40±6.91 (mm), 53.0 5±7.53 (mm), 11.90±1.97 respectively. About meristic traits, Dorsal fin rays, Anal fin rays, Ventral fin rays, Pectoral fin rays, number of Lateral line scales and total vertebrae were 7-8 (7.28±0.45), 8-10 (9.1 3±0.72), 6-7 (6.55±0.50), 13-15 (14.0 8±0.92), 43-51 (48.93±2.44) and 40-41 (40.50±0.51) respectively. Weight and age of fishes were determined 0.70-5.80 (1.73±0.99) gram and from +1 to+3 years, respectively. All morphometric traits showed significant correlation (0.05) with standard length. There was no significant correlation between meristic traits and standard length except for Scale below Lateral line, Predorsal scales and Caudal vertebrae (0.05).

Persian and Oman Gulfs are very important especially for the existence of great oil sources and its particular environmental conditions. Strategic sensitivity of this area and political, martial and economical-related tensions has overshadowed important issues like sea environmental pollutions and has transformed the Persian Gulf to one of the most polluted marine areas. Whilst the protection of natural sources as the base of development and the infrastructure of construction, plays an important role for the achievement to the sustainable development. In this respect, executive methods of the government's vast and extensive programs related to the protection of natural sources in the form of constitution and executive bylaws in domestic arena and joining to the related international documents, is an evident matter.