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  • 1
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    Measurement of some heavy metals concentration in live feed commonly used in aquaculture (2018)
    Details
    Publication Date: 2021-05-19
    Description: The aim of the current investigation was to determine the concentration of some heavy metals in a number of aquatic invertebraes commnly used as live feed in aquaculture. For this goal, samples of blood worm, sludge worm, earthworm, gammarus, shelled snail, freshwater ghost shrimp and tiny marine shrimp were prepared from aquatic environment or from imported live feeds. Samples were digested chemically and the atomic absorption were recorded as µg/g dry weight. Results showed that the highest level of heavy metals concentration were detected in live feeds as follows: iron (213.4±10.2), cadmium (1.15±0.013) and nickel (20.97±3.6) in earthworm; zinc (105.71±5.8), chrome (19.63±5.3) in sludge worm; copper (37.34±4.2) in freshwater ghost shrimp and lead (24.71±4.7) in tiny marine shrimp respectively. It is proposed that high rates of heavy metals detected in some of live feeds in the present study may eventually have a severe negative impact on fish and human health conditions. Therefore, it is suggested that upper limit concentration of these elements be defined as an import health standard for every permission of importation of live feeds.
    Description: Published
    Keywords: Blood worm ; Sludge worm ; Earth worm ; Heavy metals ; Aquatic invertebrates ; Live feed ; Aquaculture ; Measurement ; Freshwater ; Iron ; Cadmium ; Nickel ; Zinc ; Zinc ; Copper ; Lead
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.7-13
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  • 2
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    An investigation on the sustained releasing delivery of GnRHa using Freund's incomplete adjuvant in rainbow trout (Oncorhynchus mykiss) (2021)
    In:  http://aquaticcommons.org/id/eprint/23653 | 18721 | 2018-07-15 00:15:01 | 23653 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-14
    Description: In this study, Freund's incomplete adjuvant (FIA) was used for emulsifying and sustained releasing of gonadotropin releasing hormone agonist (GnRHa) in Rainbow trout (Oncorhynchus mykiss). The hormone [D-Ala6, des GlylO] m GnRHa was diluted in 0.25ml physiological saline and mixed with equal volume of FIA (GnRHa-FIA). A group of Rainbow trout broodstock were injected with GnRHa-FIA and compared with those receiving the treatment in two steps or one acute GnRHa injection. All of the fish that received GnRHa in emulsified form or in two steps injection ovulated in 10 and 11 days after injection respectively. In contrast, only 75% of the control fish and 60% of the fish with an acute injection ovulated up to 36 days after injection.
    Keywords: Aquaculture ; Ovulation ; Fish physiology ; Endocrinology ; Fish Culture ; Sex hormones ; Freshwater ; Induced breeding ; Oncorhynchus mykiss ; ISW ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 145-152
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  • 3
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    A study on methanol extract of garlic (Allium sativum) on immunity level of Mugil cephalus larvae (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25795 | 18721 | 2018-10-13 08:20:21 | 25795 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: This experiment was conducted to evaluate the efficacy of different levels of Garlic (Allium sativum) methanol extract on the growth performances (final weight (FW), daily growth ratio (DGR), feed conversion rate (FCR), voluntary feed intake (VFI) and protein efficiency ratio (PER) and some of hematological parameters (hemoglobin (Hb), hematocrit (Hct), red blood cell (RBC) and white blood cell (WBC) of grey mullet (Mugil cephalus). The experiment was conducted in a completely randomized design with 360 of larvae (with an average weight of 0.75±0.03g) in 4 treatments: control group without using Echinacea extract, another group (treatment 2, 3 and 4) the amounts of this extract were 50,100 and 200 g/kg food. The highest FW (4.22±0.11g), DGI (1.72±0.50%) and the lowest FCR (0.95±0.05) and VFI (1.77±0.05%), were observed in treatment 4. But treatment 4 in all of these growth parameters did not show a significant difference compared with treatment 3 (P〉 0.05). After 60 days, treatments 3 and 4, showed significantly higher RBC, WBC, Hb and Hct than those fed the control diet. Finally, the present results suggest that diet containing 100 and 200 g kg-1 extract could improve growth and hematological parameter of M. cephalus.
    Keywords: Aquaculture ; Health ; Iran ; Mugil cephalus ; Allium sativum ; Methanol extract ; Growth yield ; Hematological parameters ; Immunity ; Larvae
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 52
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  • 4
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    Effects of letrozole, non-steroidal aromatase inhibitor, on serum sex steroid levels, oocyte diameter and gonadosomatic index (GSI) in rainbow trout (Oncorhynchus mykiss) (2021)
    In:  http://aquaticcommons.org/id/eprint/22774 | 18721 | 2018-05-21 20:02:48 | 22774 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-10
    Description: The objective of this study was to contribute to investigate the efficacy of letrozole, a potent non-steroidal aromatase inhibitor, on serum sex steroid levels and oocyte growth in rainbow trout females. Serum steroid levels were measured using an indirect enzyme-linked immunosorbent assay (ELISA) before and 22 days after an initial injection with 1, 2.5 mg kg^-1 and subsequent weekly injection with 2.5 mg kg^-1 letrozole. After the last blood collection, gonad tissues were removed and oocyte diameter and GSI were determined. In all groups treated with letrozole, serum 17β-esteradiol levels (E2) decreased significantly and inversely serum 17α-20ß dihydroxy-4 pregnen-3-one (17α-20ß-P), testosterone (T) levels increased significantly from 6 to 96 h after injection (p〈0.05). The lowest E2 levels, oocyte diameter and GSI were measured in the group treated weekly with 2.5 mg kg^-1 letrozole (p〈0.05). This study demonstrates that letrozole has the potential to interfere in the synthesis of endogenous estrogens from androgens and delay gonadal development.
    Keywords: Aquaculture ; Biology ; Fisheries ; Aromatase inhibitor ; Sex steroid ; GSI ; Oncorhynchus mykiss ; Biology ; Physiology ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 289-301
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  • 5
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    A study on methanol herbal plant extract of Echinacea (Echinacea purpurea) on immunity level of Mugil cephalus (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25774 | 18721 | 2018-10-13 07:56:19 | 25774 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Medicinal plants have been used in oriental medicine for centuries. Echinacea purpurea (Asteraceae), also known as the purple coneflower, is an herbal medicine with positive effects on various immune parameters that has been used customarily as a treatment for the common cold, coughs, bronchitis, upper respiratory infections, and some inflammatory conditions. The aim of this study was to investigate the effect of Echinacea purpurea (EP) extract on a non-specific immunity of Mugil cephalus. Three hundred and sixty Gray mullet larvae with average weight of 0.75 ± 0.02 g and an average length of 4.40 ±0.81cm collected from Ramin port where is located at 5 km far from the Chabahar and finally transferred to lab of trial in Offshore Research Center. This research was designed based on 4 treatment, Each with 3 replicates. The major factors examined containing growth factors mainly consists of average weight, average daily gain, protein efficiency rate, protein productive rate, hematological and biochemical factors including globin, albumin, total protein, lysozyme, ultimately, immunological factors, and respiratory burst and phagocytosis percent. In general, the results of this study showed that the addition of 100 and 200 mg of EP extract per kg of diet led to a significant increase in growth parameters (final weight, food intake, daily growth rate and efficiency of protein), hematology (RBC, WBC, Hb, Hct) and biochemical factors (total protein, albumin, globulin) in gray mullet were compared to control. The highest lysozyme activity, immunoglobulin, phagocytosis and respiratory burst was observed in treatment containing 200 mg EP extract per kg food. Treatment containing 200 mg EP extract per kg food showed a minimal mortality after challenge with bacteria photobacterium damselae compared to the control treatment. Finally, the present results suggest that diet containing 200 200 mg EP extract per kg food could improve growth, hematology, immunity and resistance against photobacteriosis of grey mullet.
    Keywords: Aquaculture ; Health ; Iran ; Echinacea purpurea ; Mugil cephalus ; Photobacteriosis ; Growth ; Gematology ; Immunity ; Photobacterium damselae ; Medicinal ; EP
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 35
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