فصلنامه محیط زیست جانوری
سال یکم شماره 1 (بهار 1388)

Identification, species diversity and abundance of fishes in Markazi province, were studied during years 2004-2006. Nineteen stations were selected that included aquatic resources such as springs, rivers and dam's lakes. Fishes were caught and transferred to the lab on monthly basis. The fish were then identified using reliable references. Results indicated that 13 genus and 18 species belonged to the Osteichthyes class. Species of Alburnoides bipunctatus with 26.7% was the most abundant and Gambosia holbrooki with 0.98% was the least abundant in 19 stations. Also 3 of the exotic fishes (Grass carp, Silver carp & Gambosia) were noticed in this survey.

In order to measure physic-chemical characteristics of Gahar Roud River a total of 7 stations were selected in a 17km of river rout. 252 samples of water collected from the stations and were studied for their characteristics. This part of the experiment was carried out from January 2004 to January 2005. In this study, factors such as temperature, total hardness, calcium, magnesium, electrical conductivity, pH, phosphate, chlorine, BOD5, DO, TDS, TSS, SS, NTU and choliforms of samples were surveyed and analyzed. Due to the meaningful difference in the test results at the levels of 1 to 5, it can be concluded that ecological criteria of the river is in content change in its rout.

This study carried out during April 2007 to March 2008, for identification and determination of abundance of phytoplankton in Park-e-Dolat coastal waters of Bandar Abbas, Persian Gulf. During one year of study and monthly sampling, 19 genera consist of 11 genera of diatoms, 6 genera of dinofelagellata, 1 genus of blue-green algae Oscillatoria and one genus of green algae Zygnema were identified. The maximum and minimum diversity of phytoplankton were in January (13 genera) and in March (3 genera), respectively. The maximum and minimum abundance of phytoplankton were in June (208171666cell/m3 and 47.37%) and in March (212748cell/m3 and 0.04%), respectively. Oscilatoria sp. was the most abundant phytoplankton during one year in coastal waters of Bandar Abbas (209995585.3cell/m3). Environmental parameters including sea surface temperature, salinity, dissolved oxygen and pH were studied monthly during the study period and were 27.08±8.60°C, 39.20±1.16ppt, 5.91±0.22mg/l and 8.30±0.31, respectively. There was not a significant relationship between environmental parameters and diversity, abundance and frequency of phytoplankton during one year (Pearson coefficient, P>0.05), but only, there was a negative significant relationship between salinity and diversity of phytoplankton (r2= -0.77, P<0.05).

Enrichment of live food with HUFA, specially EPA and DHA for marine fish's larviculture is necessary for increasing survival and growth rates. During this research, Artemia urmiana nauplii were enriched with ICES30/4 for 24h. The variables used in this experiment were different salinities of 12, 23 and 33ppt. and temperatures of 22, 25 and 28°C in three replications. The fatty acid contents of Artemia samples from each experiment were measured with GC. Statistic design used was completely randomized design with Dunkan's Test. Results showed rather high increase of fatty acids of EPA and DHA, this increase was from 3.1 in control to 9.18 percent for EPA at 25°C and salinity of 23ppt. (P<0.0098) and for DHA from 0 to 0.8 percent at 22°C and 33ppt. salinity. The best condition for DHA:EPA ratio is 33ppt and 28°C (P<0.11).

Enrichment of live food with HUFA, specially EPA and DHA for marine fish's larviculture is necessary for increasing survival and growth rates. During this research, Artemia urmiana nauplii were enriched with ICES30/4 for 24h. The variables used in this experiment were different salinities of 12, 23 and 33ppt. and temperatures of 22, 25 and 28°C in three replications. The fatty acid contents of Artemia samples from each experiment were measured with GC. Statistic design used was completely randomized design with Dunkan's Test. Results showed rather high increase of fatty acids of EPA and DHA, this increase was from 3.1 in control to 9.18 percent for EPA at 25°C and salinity of 23ppt. (P<0.0098) and for DHA from 0 to 0.8 percent at 22°C and 33ppt. salinity. The best condition for DHA:EPA ratio is 33ppt and 28°C (P<0.11).

Eisenia foetida the species of earthworm is a part of important commercial species that its culture has been considered all over the world in previous years. Also some activities have been carried out in this field during these years. This inquiry has been done because of applying earthworm in rainbow trout fish (Oncorhynchus mykiss) feeding.In this examination the effect of various levels of earthworm in rainbow trout growth in (GFT2) stage was done. At the beginning, the weight of fishes was 140g. Each treatment was consist of 20 number of Rainbow trout fish. The required water for culturing was provided from a spring which was close to the farm with 14 mean temperatures. Four experimental diets on the basic of 38 percent of protein, 3300Kcal amount of energy and 13 percent of fat were containing of 10, 20 and 30 percent of earthworm. And another diet without earthworm was used as a control diet for feeding during a six weeks cultural period. In this examination, the parameters such as weight increasing percentage, total length increasing by the attention of the applied foods were measured. The diets that were consist of diverse levels of earthworm had significant differences (a = 0.5%) on weight increasing, total length increasing, standard length increasing and conversion factor. In comparing between different treatment, the diets which had 20 percent of earthworm had signification differences in the statically sight in weight, conversion factor, FER, total and standard length regarding the other diets and also had the best condition.