BREEDING AND AQUACULTURE SCIENCES QUARTERLY
Year:2017 | Volume:4 | Issue:13 |Papers Count:6

The aquatic ecosystem of Arasbaran lake in Kliber city was developed in 2003 in the geographical location of the ' 11º39 ' north latitude and the ' 18º47 eastern centuries. In this research, in 2010 for biological and non-biological sampling, 4 stations were located in the lake aquatic zone and one station at the entrance channel site. The location of the Arasbaran dam is such that it is a suitable place for rest and winter migration of migratory birds and during this research, species of them were observed. In this study, six species of native and non-native fish were identified. The study of bedding characteristics in the Arasbaran dam showed that fine grain granules and clays make up more than 74% of the bed. The mean of Benthos seedlings in studied months is 0.37 ± 0.44 g / m2 and due to the dominant presence of two groups of Chironomidae and Tubificidae, the amount of fish production is variable from 0.2 to 1.7 kg ha-1. In general, the highest phytoplankton populations belong to the Cyanophyta branch with the genus Aphanothece, Oscillatoria and Anabaenopsis and the mean of the total number of Cyanophyta was 23455960 per liter. The largest variety of zooplankton belong to the Rotatoria branch with the genus Polyarthra, Synchaeta, Brachionus, Keratella, and Trichocerca. The average water temperature was 15.8oC, with a range of 6.8 to 24.4oC, an average dissolved oxygen of 8.4 mg /l, an average electrical conductivity of 863 mm/s with a range of 717 to 1073mm/s and a mean pH of 8.28 with a range of 7.62 to 8.75 was measured. Regarding the dominant presence of two groups of Chironomidae and Tubificidae, the amount of aquarium fish production varies from 0.2 to 1.7 kg ha-1, varying from 160 to 200 hectares of the lake at different times up to 60 k.

In this study, in order to assess qualitatively the status fish ponds, three fish ponds in northern Iran were investigated. Water and fish samples were collected in the mid-June, August and October, 2014. Some parameters (temperature, pH, dissolved oxygen, electrical conductivity, transparency (SD), nitrate and phosphate) were measured on the sites while the others (Chlorophyll-a, Fe, Zn, total weight, total length, K and phytoplankton identification) were estimated at the laboratory using standard methods and procedures. The principal component analysis (PCA) and One-Way ANOVA were conducted to statistical analysis. The result showed that, during the study period, in the three fish ponds, the phytoplankton population was dominated by Bacillariophyceae (25%) followed by Chlorophyceae (23%) and Cyanophyceae (22%). Among Cyanophyceae, Chroococcus (35%) and Merismopedia (25%) were dominant. The results obtained from PCA indicated, the first three axes explain more than of 80 % of the total variance. The first axes (PC1) include EC, Chl-a, pH and SD. Also, significant differences were observed in temperature, DO, No3, Chl-a concentration, total weight and total length over the period of three months (p<0.05). The observations in this study suggest that based on the determined desirable limits for water quality in fish ponds, and based on obtained results from the fish biometry and K, generally, studied ponds are suitable for fish farming and can supply optimum and healthy production.

This research was conducted for 45 days at the Caspian Sea Aquaculture Research Center (Aquaculture Research Institute). Treatments included autumn and spring form, which were randomized and three replications. A total of 6 tests planes were used. Water was supplied from pumping water from the Caspian Sea coast. The meal was started with SFC1 Concentrate. The feeding rate was considered to be 4% of total weight. The results showed that the maximum and minimum amount of weight gains were occurred in race, autumn treatment (mean=42.66±1.82) and spring race (mean=31.92±8.24), respectively. The minimum average of FCR (4.13±0.11) was referred to race, autumn treatment and the maximum of that (5.18 ± 1.41) was referred to spring race.

Salmo trutta fario is a vulnerable population and usually upstream of most of the rivers in the Southern Caspian Sea and inland waters. The fish which is in the rivers of Havigh Astara and Shafaroud Rezvanshahr population and hence, respectively, 41 and 32 with a fishing device, electric, tour throw the hook in the years 2009 and 2010 catches and characteristics of morphometric and meristic were studied. Studied fish in the river of Shafaroud weighs 7.54 to 78.4 (29.65 ± 16.7) gr and fork length 85 to 184 (125.8 ± 22.4) mm and has weight in the river of Havigh 11.3 to 73.8 (26.17 ± 16.4) gr and fork length of 94 to 176 (121.6 ± 22.8) mm, respectively. The number of scales on the lateral line is 104 to 139, the number of scales between the adipose fin and lateral line is 14 to 19, the number of rays soft. The results show that the significant difference between the head length and head height, the length of the upper jaw, eye diameter, height maximum and minimum body height of the dorsal and anal fins, the pectoral and ventral fins.

The man- made Chitgar lake is located in the north-western of Tehran and was received its from Kan river in 2012. The water quality was investigated on 5 sampling sites during 2013-2014. Standard methods (APHA, 2005) were used for Analysis of water parameters. The results indicated that the mean monthly temperature of water were measured 18.4 °C with minimum 6.3 °C and maximum value 27.1 °C. The mean EC level was 373 ± 30 ms/cm. The mean monthly dissolved oxygen and total phosphorous were 7.8 ± 1.2 and 0.035±0.010 mg/l, respectively. The mean of chlorophyll-a was 1.59 ± 0.810 mg/l. In fish assessment eighteen species were identified in the lake, while 11 species were from Cyprinidae family and one species was native (Capoeta bohsei). The exotic fish species were dominant in the Chitgar lake.

Five groups of Astronatus ocellatus were fed with the average mean of 0.8 gr in 90 days in aquariums 30´30´60. The amount of amino acids existing in the muscle of the fish for control treatment and treatment 4 ml/gr was compared. The result showed that there was a meaningful difference between control treatment and treatment 5 (p<0.05). The amount of Lysine, Methionine, Valine, Phenylalanine, proline, glycine, threonine, glutamic acid was respectively 14.95, 3.14, 9.54, 30.84, 7.01, 11.31, 8.74, 30.18.ml/gr of the muscle of the fish with 4 ml Cobalt chloride in 1 kg of food which was more than the other rations such as treatment ration.