فصلنامه آبزیان و شیلات
پیاپی 6 (تابستان 1390)

In order to some morphometric and meristic study of capoeta fusca Nikolskii, 1897 in Qanats of Ferdows city during 2010 to 2011, 90 specimens were collected of three Qanats in Ferdows city. Specimens after fixation in 10% formalin, were transferred to the Razi laboratory of Ferdows city and identiffed by identification key. The maximum and minimum of Total length for C. fusca of Ferdows city Qanats were 19.6 cm and 3/02 cm. The results showed in this species there is in the Dorsal fin 3 unbranched ray and 7 branched ray, in Anal fin 3 unbranched ray and 5 branched ray, in Pelvic fin 1 unbranched ray and 8 branched ray and in Pectoral fin 1 unbranched ray and 16 branched ray. Also were counted, lateral line scales 45 to 53; Above the lateral line scales 8-9, Bottom the lateral line scales 7. The relationships study for this species showed between Total length- Head length, Total length- Body Depth and Head length- Body Depth, is a positive and significant correlation and have are. /99 of correlation coefficient. Also, in The statistical comparison of morphometric and meristic characters of specimens between three locations by F-test, were not significantly different(P>0/05).

This study compared concentration of heavy metal Cadmium, Lead and Mercury in muscle, liver and gill of fish L.abu Dez river Khuzestan province in 2009 was conducted.Sampled in winter by the local Hunters by traditional nets (Gill net) was performed. After the biometric data of 27 specimens were recorded the samples of muscle, liver and gill were obtained. Sample preparation and analysis was done according to Moopam method.The concentration of heavy metals in the dry digested samples of tissues was measured using an an atomic absorption spectrophotometer scholar was (AAS), Perkin Elmer 4100 laboratory alchemy.Results based on the Dez River biometry average fish (L. abu total length, standard length and fish weight, respectively: 21/16 0/82,17/94 0/91, 119/77 21/03. The results of this study showed that the average concentration of heavy metals was negligible and at maximum value in muscle (0.023 0.001) and giil 0.959 0.038) tissues.The highest concentration of Cd, Hg and Pb, respectively: 0.367±0.024, 0.025 0.000, 0.959 0.038 mg/Kg and lowest concentration of Cd, Hg and Pb 0.348 0.031, 0.023 0.001, 0.907 0.33 mg/Kg. The amount of mercury, Cadmium and Lead in muscle, gill and liver were not significantly different (P 0.05).Comparing the results obtained from measuring heavy metals with international standards(WHO, FDA, MAFF, NFA, NHMRC) showed that cadmium levels in the species studied, more than the limit of international standards and the lead was just more of the standard (WHO).

Microalgal growth can be restricted due to low levels of nutrients in the environment. Moreover, there can be changes in their biochemical content. Some microalgae are used for feeding various animal breeds. In spring of the 1390 a study was conducted at the Islamis Azad University of North Tehran Branch, Tetraselmis suecica was grown in f2 Guillard culture in various concentrations of nitrate (6.12 (low), 12.25 (standard), and 24.71 (high) mgL 1) and the effect of different concentrations of nitrate on the amount of protein, chlorophyll, and dried weight of algae Tetraselmis suecica was evaluated. Results showed that increasing the amount of nitrate significantly increased the protein content of algae (p < 0.05). The amount of protein by the 5th day of culture in high concentration of nitrate was at 5.8%, which increased to 10.7% by the 9th day. However, the amount of protein in the 9th day of culture for standard and low nitrate concentrations did not exceed 5.8% and 5.1% respectively. Chlorophyll a decreased significantly (p < 0.05) as a result of decreasing the available nitrate levels for algal cells. By the 9th day, the dried weight of cells grown in low nitrate concentration was measured at 0.18 mgL-1, and in high concentration of nitrate at 0.156 mgL-1.

This study was conducted to increase production per unit area in Persian Gulf Shrimp Site (Bandar Mogham) and took in 2010. 6 earthy ponds of 0.8 hectare were used. Shrimp species tested is Litopenaeus vannamei at PL12 age and stocking density was 38 PL/m2 done at 5-April, simultaneously. All ponds tested in this study were contiguous and all culture conditions are same. After 93 days of culture, 3 ponds harvest with single-batch method in 7- July. 3 other ponds for partial harvest methods selected and only 55 percent of shrimp were caught and 45 percent of shrimp remain for culturing period after partial harvest in this pond.After partial harvesting shrimp density reach to 14 PL/m2. Culture duration after partial harvest was 99 days and final harvest occurred in 16-October. After the final harvest and calculated total production and profit, the results show increased 121% equal in shrimp production (kg per Pond),160% equal in gross profit and 234% equal in net revenue (USD per Pond) took part in the pond with partial harvest than pond with the single-batch harvest. Finally good management took partial harvest must increased survival rate, shrimp production with larger size, shrimp produce more and eventually earned net revenue increases.

The effects of Biomar, Calf heart, Tubifex, Gammarus and Artemia on some blood serum biochemical factors in Pangasius hypophthalmus were studied. This study was counducted during 8 weeks and 5 treatments were included: treatment 1: Biomar, treatment 2: Calf heart,treatment 3: Gammarus, treatment 4: Artemia, treatmeent 5: Tubifex. Amount of food required according to the weight of the biomass and 10 % of body weight four times a day in 8:00, 12:00, 16:00 and 20:00 hours were added to each aquarium. Physico-chemical parameters such as oxygen, hardness, pH, temperature were 5.5 - 6, 70 dh, 8 and 29 2 0C,respectively. Finally, after about weight and length of test fish in each aquarium statistical calculations values of growth indicas were calculated according to the formula. Analyze data and draw graphs respectively by computer software SPSS 13 and Excel 2003 were performed. According to the results of this study there were significant differences in the value of glucose, triglyceride, cholesterol, calcium, albumin, total protein, phosphorus iron and alanin aminotransferase (P< 0.05). However, there were no significant deifferences the value of aspartate aminotransferase and alkaline phosphatise (P > 0.05). Based on the obtained results it can be declared that different diets could improve some blood serum biochemical factors in Pangasius hypophthalmus.

Cultured shrimps is one of the important export in fishries, produces in Islamic Republic of Iran. After catch the shrimp from ponds, they were kept in slurry ice tanks for 30 seconds immediately. sampling was performed before treatment of shrimp with sodium metabisulphite (SMB) and afterward kept in ice boxes using ice and shrimp samples which preserved layer by layer.The samples were transported 130 kilometers, from Tiab (near the Minab city) to Persian Gulf and Oman Sea Ecological Research Institute in Bandar Abbass for laboratory examinations.The estimated means for length and weight of shrimp were recorded 11.5±0.90 cm and 12.2±0.62 gr respectively. In this study, several aspects of SMB treatments for prevention of melanosis were compared in order to produce high quality production for export purposes. The total absorption of SMB in muscle was estimated based of different time (0.5, 1, 2, 4, and 6 Minute), different temperature (0, 5, 15, and 25 centigrade), and different solutions with different Sodium metabisulphite concentrations (1.25, 5, and 10 %) in sea water (38 ppt) as well.Titration method using Iodine treatment was performed in order to determination of the remained concentration of SO2 in shrimp muscle. The results showed that the concentration of SMB, the duration time of keeping the shrimp in solutions and the temperature of solutions had same influence for absorbing the SO2 in our samples. The obtained results showed that the SO2 concentration has increased using treatments from 30 second to 4 minutes but this indice has decreased for a time treatment using 6 minutes for this purpose. The results regarding to estimation of pH for treatments showed that this indice has a contrast level respect to the SO2 concentration for treatments as well. In the other word, the pH level has decrease during increasing the SO2 concentration and increase during decreasing the SO2 concentration. The best records for preserving the samples were recorded using 5% SMB concentration at 4 minutes in zero degree of centigrade. These achieved record could be due to sulfure dioxide absorbtion by samples for 251±7.51 mg/kg. Due to ice melting, a part of sulfure dioxid was released during transportation and the final sulfure dioxide absorbtion were decreased to the expected scale for 100 to 150 mg/kg. Using mentioned concentration would be suggested for shrimp before transportation.

The aim of this study is to evaluate effects of antibacterial and antioxidant bacteriocine Z and vacuum packaging in filleted Caspian roach (Rutilus frisii kutum) during 16 days storage in 4?C was investigated. Changes in some quality indexes of including Microbial parameters (the total viable, psycrotrophic and lactic bacteria counts) and chemical parameters (PV and TVN) were measured at days of 0, 4, 8, 12 and 16 days. Microbial parameters was significantly decreased in bacteriocine treats at the beginning of the period but had slower growth rate than the control samples. Chemical parameters had slower growth than control sample in bacteriocine treats. Results show that using bacteriocine Z causes increase in shelflife of silver carp fillet for 16 days in 4 C

In this study considered the construction of zooplankton population along with features of chemical, physical water such as water temperature, depth water transparency (SD), total phosphorus(TP), Nitrate (NO3 -), total nitrogen (TN), the vision of TN/TP and chlorophyll-a in the form of being monthly from April 2009 to April of 2010 (13months) in three studying Stations.For this aim sampeled zooplankton density, chlorophyll-a concentration and other parameters in three replicates at each station. In this study, identified about 71 genera of zooplankton wich are belong to the 9 phylum, 12 class, 21 orders and 43 family. The whole mean density of zooplanktons Valasht lake estimated 10086 individual per meters. The maximum density of zooplankton observed in April of 2009 with average of 24,506 individual per meters and least of it in January with average of 846 m3. Also, the annual average of chlorophyll-a concentration Valasht Lake estimated 2/87 micrograms per liter with the maximum of 6/47 in March and the least 1/13 micrograms per liter in September. In this period the rate of water chlorophyll-a concentration showed a negative correlation with the nitrate rate and also with density of species with belong to two phylum Ciliophora and Rhizopoda,also with density of species (Chydorus sphaericus) belonging to the cladoceragroup of the phylum Arthropoda.