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Iranian Scientific Fisheries Journal
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  This is an Open Access Journal Open Access journal
ISSN (Print) 1026-1354 - ISSN (Online) 2322-5998
Published by Iranian Fisheries Research Organization Homepage  [1 journal]
  • Investigating the anesthetic vigor and histopathological effects of
           Peppermint (Mentha piperita) essential oils in Common carp (Cyprinus
           carpio)

    • Authors: J. Mirdar Harijani
      Abstract: The aims of this study were to assess the anesthetic vigor and histopathological effects of peppermint (Mentha piperita) essential oils in common carp (Cyprinus carpio). The total number of 70 fish with the average weight and length of 8.52±1.54 g and 8.47±1.16 cm were anesthetized by various concentrations of peppermint essential oils including 200, 250, 300, 350, 400, 450 and 500 ppm using the immersion method. The average amounts of temperature, pH and the hardness of water were 22±2˚C, 7 and 981 mg/L, respectively. The time taken to reach different stages of anesthesia, loss of equilibrium, twilight anesthesia, balance recovery and complete recovery were measured after exposure of fish to various concentrations of peppermint essential oils. In order to determine the effects of various concentrations of peppermint essential oils including 200, 300, 400 and 500 ppm at time 0 and 24 h, the tissue samples that were taken from the liver, kidney and gill of fish were examined by light microscopy. The results showed that the maximum and minimum time taken to reach complete anesthesia were observed after 10±5.11 and 73±16 seconds of exposure to 200 and 500 ppm of peppermint essential oils, respectively. The minimum time taken for recovery was 300±8.4 seconds which belonged to the treatment of 200 ppm peppermint essential oils. Moreover, the results showed that by increasing the concentration of anesthetic substance, the induction of anesthesia was faster and the time taken for complete recovery from anesthesia was increased. Histopathological studies showed that the optimum concentration of 200 ppm peppermint essential oils had no side effects. Therefore, this anesthetic concentration of peppermint essential oils can be safely used.
       
  • Investigating the selectivity of gillnet used for catching the Crimson
           snapper (Lutjanus johni Bloch, 1792) by length-girth relationships in the
           coastal waters of Bandar Abbas

    • Authors: S. Gorgin
      Abstract: Crimson snapper (Lutjanus johni Bloch, 1792) is the most important commercial species in the Persian Gulf and the Oman Sea. This species is caught by gillnets in the coastal waters of Bandar Abbas. In the present study, the gillnet with 17 cm stretched mesh size (knot to knot) is used for investigating the selectivity of gillnet used for catching the crimson snapper by length-girth relationships in the coastal waters of Bandar Abbas. Sampling was performed in May and July 2017. The total numbers of 1107 specimens were caught after 210 times of gillnetting. The weight, total standard length and girth of 4 points of body (locations of eyes, operculum, beginning of the dorsal fin and maximum girth) were measured for all specimens. Regression of length-girth, length-weight and selectivity curve were drawn based the data. Results showed that the total length was increased by increasing the body girth and weight of fish. Based on the body girth of two points including branch girth and maximum body girth, the selectivity of gillnet ranged from 62 to 76 cm in which the optimum length was 69 cm that is higher than Lm50. Therefore, it can be concluded that gillnet with 17 cm mesh size is suitable for catching crimson snapper.
       
  • No title

    • Authors: S. Yeganeh
      Abstract: Finding the suitable substitution for fish meal without any negative effect on fish performance is especially important for aquaculture development. In this research, the effect of substitution of fish meal with different levels of earthworm (Eisenia fetida) meal and garlic (Allium sativum) powder were studied on hematological and serum parameters of rainbow trout (Oncorhynchus mykiss) fingerlings. For this purpose, various diets were prepared containing different levels of substitution of fish meal with 0, 25, 50 and 75% of earthworm meal accompanied by 0 and 2.5% of garlic powder. Fingerlings with the average initial body weight of 30±0.27 g were reared in equal conditions for 56 days in 8 treatments and each treatment had three replicates. At the end of the experiment, the results of blood and serum biochemical indices assessments showed that the highest amounts of hemoglobin, hematocrit and WBC were observed in the treatments containing 25% earthworm meal with garlic powder, 25% earthworm meal with and without garlic powder and 75% earthworm meal without garlic powder, respectively whereas the lowest amount of RBC was observed in the treatment containing 50% earthworm meal without garlic powder. MCV, MCH and MCHC values in the treatment containing 0% earthworm meal with 2.5% garlic powder were significantly higher as compared to those of the other treatments except the control treatment (P
       
  • Evaluating the effects of dietary intake of encapsulated Lactobacillus
           plantarum KC426951 on growth, survival rate, blood and serum factors and
           gut bacterial flora of Rainbow trout (Oncorhynchus mykiss)

    • Authors: A. Valipour
      Abstract: In this study, the effects of Lactobacillus plantarum KC426951 on growth, survival rate, blood and serum factors and gut bacterial flora of rainbow trout were investigated. For this purpose, 90 fish with an average weight of 12.94±0.35 g were fed for 8 weeks with the diets containing different amounts of encapsulated Lactobacillus plantarum including treatment 1 (107 CFU/g), treatment 2 (108 CFU/g) and the control treatment without Lactobacillus plantarum (T0). The results of this study showed that the highest weight gain, percent of body weight gain, specific growth rate and the lowest feed conversion rate were observed in the treatments 1 which were significantly different as compared to those of the control treatment (P0.05). In blood factors, the numbers of white blood cells in the treatments containing bacteria were significantly higher than the control treatment (P
       
  • Effects of enrichment of Artemia franciscana with fish oil and soybean oil
           accompanied with vitamin E on the structure of pyloric caeca in Persian
           sturgeon larvae (Acipenser persicus)

    • Authors: Kourosh Sarvi Moghanlou
      Abstract: In the present study, the effects of enrichment of Artemia franciscana with fish oil and soybean oil accompanied with vitamin E were investigated on the structure of pyloric caeca in Persian sturgeon (Acipenser persicus) larvae. A total of 1500 Persian sturgeon larvae (with the average weight of 51±2 mg) were divided into 15 tanks. Larvae were fed for 17 days in 5 experimental treatments including the treatment C (non-enriched artemia), S15 (enriched artemia with soybean oil and 15% vitamin E), S30 (enriched artemia with soybean oil and 30% vitamin E), F15 (enriched artemia with fish oil and 15% vitamin E) and F30 (enriched artemia with fish oil and 30% vitamin E). From each traetment, 15 larvae were collected and were fixed in Bouin’s solution for histological studies. Histological results showed that both fish oil and soybean oil were the main and effective factors on the total area and histo area indices of the pyloric caeca and the enrichment of artemia with fish oil and soybean oil was significantly increased this factor as compared to that of the control treatment  (P
       
  • Antibacterial activity of Saponin extracted from the sea cucumber
           (Stichopus hermanni) collected from the Persian Gulf

    • Authors: I. Souinezad
      Abstract: Sea cucumbers produce various bioactive compounds especially secondary metabolites including Saponin. The aim of this study was to investigate antibacterial activity of the Saponin extracted from the Persian Gulf sea cucumber (Stichopus hermanni) in some gram positive and negative bacteria. Extraction was first done by ethanol 70% and then Saponins were separated through column chromatography with silica gel. Extracted Saponins were identified through thin layer chromatography (TLC) and high performance thin layer chromatography (HPTLC). Minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were investigated via tubular dilution. Two groups of steroidal and glycosides Saponins with Rf 0.9 and 0.05 were respectively identified in fractions extracted by TLC. HPTLC results for a sample of extracted Saponin confirmed the existence of Saponin in sea cucumber regarding the Rf. The gram negative bacterium Pseudomonas aeroginosa was the most resistant one to steroidal and glycosides- steroidal Saponins with MIC of 500 and 400 micg/ml, respectively. Steroidal and glycosides- steroidal Saponins showed no bactericidal effect in gram negative bacterium Pseudomonas aeroginosa. Among the gram positive bacteria, the highest MBC of 500 micg/ml belonged to glycosides- steroidal Saponin for Staphylococcus aureus. The higher MIC in gram negative bacteria approves the lower antibacterial property of the steroidal and glycosides Saponin extracted from sea cucumber Stichopus hermanni in these bacteria compared to the gram positive ones.
       
       
  • Investigating the influence of different concentrations of sodium nitrate
           and sodium bicarbonate ingredients on biomass and lipids production on
           microalgae (Neochloris oleoabundans)

    • Authors: A. Jafarpour
      Abstract: Carbon and nitrogen sources are considering as the essential substances for microalgae growth. In this study the effects of sodium Nitrate (NaNO3) and sodium bicarbonate (NaHCO3) on the growth rate of N. oleoabundans microalgae in BBM culture medium were investigated. In this regards, different concentrations of NaNO3  as 0, 0.5. 1.0, 2.5, 5 and 10 and NaHCO3 as 0, 0.25, 0.5, 0.75, 1.0 and 1.25 in BBM during 21 days were tested. According to the results, by application of 10 mM NaNO3 the highest number of microalgae as (84.66±0.577)× 106 cells/mL was recorded and in case of nitrogen absence no increase in cell numbers was observed (p
       
 
 
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