Showing 5 results for Radkhah
Alireza Radkhah, Soheil Eagderi,
Volume 4, Issue 4 (Spring 2015)
Abstract
This study aimed to the first report of Saw-belly, Hemiculter leucisculus from the Zarinehrud River and investigation of its morphometric and meristic characteristics, length-weight and length-length relationships. A total of 77 saw-belly specimens were caught on September 2013 from the Zarinehrud River. Twenty-one morphometric and 10 meristic characters were examined. The total length and weight ranges were 66-142 mm and 1.7-30.27 g, respectively. The parameter b of 3, indicating its isometric growth pattern. Regarding the observed species diversity and presence of 6 other exotic fish species in this River, the saw-belly has probably introduced to this river with commercially cyprinid species from the Caspian Sea basin.
Alireza Radkhah, Hadi Poorbagher , Eagderi Soheil ,
Volume 5, Issue 3 (Winter 2016)
Abstract
The present study investigated morph metric characteristics of two populations of Alburnusatr opatenae in two rivers on north western Iran. In addition, the role of important ecological factors influencing morph metric features was studied. Ninety three specimens were collected from the Siminehrood (39) and Zarinerood (54) Rivers using electrocution. The specimens were photographed using a digital camera, imported into the software Image J and 21 morph metric characteristics were measured. The two populations had significant differences in morph metric features. Principal component analysis indicated that the distance between the pelvic fin and the snout, and also body height were the most important factor that separated the populations. Two-block partial least square showed that depth and Water flow ratehad the highest influence on morphology of A. atropatenae in the Siminehrood and Zarinerood Rivers.
Morteza Bahremand, Fatemeh Moghaddas, Sadra Mahmoudi, Alireza Radkhah, Asieh Soleimanirad,
Volume 9, Issue 2 (Autumn 2019)
Abstract
This study was carried out to determine the optimal feeding frequency for koi carp (Cyprinus carpio var. Koi). 540 juvenile koi (2.24 ± 0.11 g) were fed with six different feeding frequencies i.e., one, two, three, four, five, and six times a day for 75 days, and the growth performance, survival, and body composition were evaluated. The results showed a significant effect of different feeding frequencies on all measured parameters. The maximum and minimum weight gain, length, and SGR were observed in treatments 5 and 1, respectively (p<0.05). The minimum and maximum FCR were observed in treatments 5 and 1, respectively (p<0.05). Mortality was observed only in treatments 1 and 2. The highest and lowest amount of carcass protein was belonged to treatments 5 and 1, respectively. By increasing the daily feeding frequency, RLG decreased. However, this decline was not statistically significant. According to the results, increasing feeding frequency up to 5 times a day improved all parameters related to growth performance, nutrition, survival, and carcass composition in koi fingerlings. Therefore, a minimum of 5 times feeding frequency a day could be suggested in koi fingerlings in this weight range.
Esmaeil Sadeghinejad Masouleh, Ali Reza Radkhah,
Volume 10, Issue 3 (Winter 2020)
Abstract
The present study aimed to investigate some biological characteristics of Mesopotamian chub (Squalius berak) in the Kashkan River, Lorestan province. 60 specimens of Mesopotamian chub were captured from the Kashkan River using electrofishing equipment in September 2018. Biometry and weight of fish specimens were measured using a caliper and digital scale, respectively. Then, length-length and length-weight relationships (LWR), growth pattern, condition factor, and age of the fish samples were studied. Based on the results, the mean length of males and females were 197.39 mm and 257.88 mm, respectively. Also, the mean weight of males was 101.2 g, and for females was 258.76 g. Results showed that male and female fish follow isometric and positive allometric growth patterns, respectively. The condition factor values for male and female fish were 1.06 and 1.13, respectively, indicating a desirable status for this fish species in the Kashkan River. In addition, the age range of fish was between 2+ to 5+ years and the highest frequency (41.93 %) was in the 3+ age group.
Ali Reza Radkhah, Soheil Eagderi, Hadi Poorbagher,
Volume 12, Issue 2 (Summer 2022)
Abstract
The aim of this study was to identify environmental factors affecting the abundance and biodiversity of fish communities in the Dinor River in Kermanshah province. For this purpose, six stations were selected for sampling fish along the Dinor River in June 2018. In addition, physicochemical parameters and biodiversity indices of fish were determined. Canonical Correspondence Analysis (CCA) was used to determine the environmental factors affecting biodiversity indices and fish species. Based on the results, a total of 2543 fish samples were caught from in Dinor River, which belonged to 20 species. Most fish species belonged to the Cyprinidae family. Alburnus sellal (with 1358 samples) and Capoeta trutta (with 1 sample) showed the highest and lowest abundance in Dinor River, respectively. Medium bedrock diameter with a coefficient of 0.65, water flow velocity with a coefficient of 0.60 and TDS with a coefficient of 0.52 were identified as the most effective environmental variables on fish abundance in the Dinor River. In addition, among the studied environmental variables, river width with a coefficient of 0.64, depth with a coefficient of 0.58, EC with a coefficient of 0.44 and TDS with a coefficient of 0.42 showed the most significant contribution to fish species diversity in the Dinor River.
