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Bandpei M.A.A.,Universiti Sains Malaysia | Mashhor M.,Universiti Sains Malaysia | Abdolmaleki S.,Inland Water Aquaculture Research Center | El-Sayed A.-F.M.,Alexandria University
Cybium | Year: 2010

The population dynamics of Caspian Kutum, Rutilus frisii kutum (Kamensky, 1901), sampled from commercial beach seine catches from the southern Caspian Sea (Iran), was investigated. A random sample of 1360 fish, representing a wide range of fish size (20 to 58 cm FL), was collected from early October 2006 to middle of April 2007. Length-frequency analyses and FiSAT software were used to study the population dynamics. The values of the von Bertalanffy growth function fit to size-at-age data were: L ∞ = 59.85 cm fork length (FL), K = 0.27 yr -1, C = 0.25, WP (winter point) =0.40. Using the seasonalized length converted catch curve, the instantaneous total mortality coefficient Z was estimated as 1.28 yr -1. The instantaneous natural mortality coefficient M was 0.46 yr -1, while the instantaneous fishing mortality coefficient F was 0.82 yr -1, giving the current exploitation rate E= 0.64.The mean length at first capture L c estimated from the analysis of probability of capture of each length class was 36.8 cm FL. The maximum exploitation rate E max predicted from the relative yield per recruit analysis was 0.76, while the current exploitation rate E is less than E max. This indicates that Caspian Kutum is moderately exploited in the southern Caspian Sea.


Ahmadnezhad M.,Islamic Azad University at Tehran | Oryan Sh.,Kharazmi University | Bahmani M.,International Sturgeon Research Institute | Sayad Bourani M.,Inland Water Aquaculture Research Center
Iranian Journal of Fisheries Sciences | Year: 2014

Osmoregulation capabilities of two size groups (1 and 2g) of zander , Sander lucioperca, fingerlings were investigated survival rate, plasma osmolarity, sodium (Na+), chloride (Cl-) ion concentrations and cortisol level within 0, 6, 24, 72 and 240 h after abrupt transfer from freshwater to 7 and 12‰ salinity. Also, some hematological parameters were measured at 240h. The plasma osmolarity and ion concentrations (Na+, Cl-) increased immediately after the transference to 7 and 12‰ salinity, reaching maximum at 72h in 1g and at 24 h in 2g fingerlings, and significantly decreased at 240 h, while the freshwater control group maintained almost constant during 10 days which showed lower than the salinity groups. The pattern of cortisol level changes was similar in two size groups after exposure to different salinities and it reflected stress of handling. There were no significant differences between hematological values of two salinity treatment groups than the freshwater control at 240h. The result showed, not only 2g zander fingerlings acted better than 1g in faced with salinity but also the fingerlings weighing 1g could survived and tolerate Caspian Sea water salinity up to 12‰. It is suggested that the release of zander weighing from 1g would help to restocking management of this species in the southern Caspian Sea.


Fazli H.,Caspian Sea Ecology Research Center | Daryanabard G.R.,Caspian Sea Ecology Research Center | Abdolmaleki S.,Inland Water Aquaculture Research Center | Bandani G.A.,Inland Water Stocks Research Center
Journal of Applied Ichthyology | Year: 2013

Recent changes in the Caspian ecosystem have caused changes in the absolute and relative abundance of the commercially important golden grey mullet (Liza aurata) in Iranian waters. In order to adjust for these changes a more rigorous management of this fishery resource is required. The present study examines the biomass of golden grey mullet during 1991-2010. Estimates of fMSY, yield-per-recruit and spawning biomass-per-recruit are presented for various harvesting strategies of Fmax, F0.1, F35%, and a method is proposed for estimating acceptable biological catch (ABC) that accounts for large differences in the quality and quantity of information and available data. Biomass estimates of golden grey mullet, derived from a biomass-based cohort analysis, increased from 13 527 tonnes in 1991-1992 to 20 100 t in 2000-2001, and declined to the lowest level (11 000 t) in 2007-2008. In 2009-2010, the total biomass was estimated to be 14 400 t. The ABC was estimated at 2200 t in 2010. Golden grey mullet is vulnerable to environmental factors, which should be considered in the stock assessment and management of the fish. © 2012 Blackwell Verlag GmbH.


Ahmadnezhad M.,Inland Water Aquaculture Research Center | Oryan S.,Kharazmi University | Sahafi H.H.,Iranian Fisheries Research Organization | Khara H.,Islamic Azad University at Lahijan
Turkish Journal of Fisheries and Aquatic Sciences | Year: 2013

To assess changes of gonad development and sex steroids hormones of R. frisii kutum, broodfish were captured during spawning season 2010 (March-April) and induced intramuscularly with following hormone treatments: single injections of 1 μg kg-1 b.w. LHRH-A2, combination of LHRH-A2 with two dopamine antagonists as follows: 1 μg kg -1 b.w. LHRH-A2 + 5 mg kg-1 b.w. PIM, 1 μg kg-1 b.w. LHRH-A2 + 2.5 mg kg-1 b.w. chlorpromazine, 1 μg kg-1 b.w. LHRH-A2 + 5 mg kg-1 b.w. PIM + 2.5 mg kg-1 b.w. chlorpromazine, single injections of 5 mg kg-1 b.w. PIM and 2.5 mg kg-1 b.w. chlorpromazine, carp pitatury extract (CPE), saline solution (NaCl 0.7%) and control group (without injection) were used, respectively. The number of ovulated fish was different in each treatment. Ovaries were more progressed in ovulated rather than non-ovulated fish. Also, sex hormones such as testosterone (T) and estradiol (E2) were changed in different hormonal treatments. In ovulated fish, histological analysis revealed six stages in ovaries, while ovaries in non-ovulated ones were developed only in fourth stage. © Published by Central Fisheries Research Institute (CFRI) Trabzon, Turkey.


Jafarzadeh E.,Islamic Azad University at Lahijan | Khara H.,Islamic Azad University at Lahijan | Ahmadnezhad M.,Inland Water Aquaculture Research Center
Comparative Clinical Pathology | Year: 2015

The present study was carried out to evaluate the effects of synbiotic (Biomin IMBO) on haematological (white blood cell (WBC) and red blood cell (RBC) counts, haemoglobin (Hb) concentration, haematocrit (Hct), mean corpuscular haemoglobin (MCH), mean corpuscular volume (MCV) and mean corpuscular haemoglobin concentration (MCHC)) and immunological (immunoglobulin (IgM) and lysozyme activity) components of Russian sturgeon, Acipenser guldenstadti. Five experimental treatments and one control group with three replicates were considered. In treatment groups, fish were fed with diet containing 1 (T1), 1.5 (T2), 2 (T3), 2.5 (T4) and 3 (T5) g synbiotic/kg diet. In control group, fish were fed without supplement of synbiotic. Blood sampling for haematological and immunological studies was done at days 20, 40 and 60 after the beginning of the experiment. Based on our results, synbiotic supplement had no significant effects on values Hb, Htc, MCV and MCHC compared to control group (P > 0.05). Also, in all experimental treatments, these parameters did not considerable changes during the course of the experiment (P > 0.05). The effect of synbiotic supplement on MCH was not significant (P > 0.05); however, this value was higher in synbiotic supplement treatments compared to control group. MCH had no significant changes during the period of the experiment in all experimental groups (P > 0.05). In all synbiotic treatments, the values of WBC count, neutrophils, monocytes and eosinophils were higher than control group (P < 0.05). Only, lymphocytes in synbiotic supplement treatments were lower compared to control group (P < 0.05). Also, WBC count showed a decreasing trend during the period of the experiment in all synbiotic supplement groups (P < 0.05). Synbiotic supplement increased RBCs compared to control group; however, this was not significant (P > 0.05). The values of RBCs in T4 and T5 showed an increasing change over the course of the experiment (P < 0.05). The immunological components, i.e. IgM concentration and lysozyme activity, were found to be higher in synbiotic supplement treatments compared to control group (P < 0.05). These parameters had no significant changes over the course of the experiment (P > 0.05). © 2015, Springer-Verlag London.


Zorriehzahra M.J.,Iranian Fisheries Research Organization IFRO | Nazari A.,Islamic Azad University at Falavarjan | Ghasemi M.,Inland Water Aquaculture Research Center | Ghiasi M.,Mazandaran Fisheries Research Center | And 3 more authors.
VirusDisease | Year: 2014

Mullets are dominant fishes in the catch composition in the southern coasts of the Caspian Sea and after (Rutilus frisii kutum Kamensky, 1901) have a worthy role in production of marine proteins and incomings of north provinces of Iran. Mullets stocks decreased dramatically in recent decades in the Caspian Sea and catch amount reached from 6446 MT on 2002 to 2151 MT in 2012. Mysterious mortalities occurred in wild mullet (Liza auratu) and (Liza saliens) in Iranian waters of Caspian Sea in recent years. Regarding to investigation of causative agent of mentioned outbreak about 322 suspected samples were collected from coastal capture sites of Iranian north provinces in 2008 till 2011. Moribund fish revealed skin darkening, erratic swimming, belly-up at rest and high distension of swim bladder. Target tissues such as brain and eye were removed and then fixed for histopathology and TEM assay. Widespread and massive vacuolation were observed in brain, spinal cord, retina and optical nerve and intracytoplasmic vacuoles and virus particles in retina. So concerning to clinical signs, histopathological and TEM findings, it could be concluded that nodavirus-like agent could be probable cause of mass mortality of wild mullet in Iranian waters of the Caspian Sea. © 2014, Indian Virological Society.


Khara H.,Islamic Azad University at Lahijan | Maghsoodloo E.,Islamic Azad University at Lahijan | Ahmadnezhad M.,Inland Water Aquaculture Research Center | Yalghi S.,Inland Aquatics Stocks Research Center | Rahbar M.,Islamic Azad University at Lahijan
Comparative Clinical Pathology | Year: 2014

The aim of this study was to measure sex steroid levels before and after induction of ovulation using luteinizing hormone-releasing hormone analog (LH-RH-A)2 in female Persian sturgeons. A total of ten females were induced by LH-RH-A2 hormone. Seven females were ovulated successfully, and rest of breeders did not respond to hormonal treatment (non-ovulated fish). The serum cortisol (C), testosterone (T), oestradiol-17b (E2), progesterone (P4), testosterone (T), FSH, and LH concentrations were measured by radioimmunoassay. In ovulated and non-ovulated females, C and P4 levels tended to increase after LH-RH-A2 injection. Serum E2 levels in ovulated and non-ovulated females decreased dramatically after LH-RH-A2 injection. Following hormonal treatment, T levels increased slightly in ovulated and non-ovulated females, but values were not statistically different. An increase was observed in FSH levels of ovulated fish, but this trend was not observed in non-ovulated females. The data clearly illustrated that induction of ovulation in female Persian sturgeons using LH-RH-A2 led to change in steroid hormones. Also, the rise in C levels may indicate an interaction between corticosteroids and gamete maturation in Persian sturgeon. © 2013 Springer-Verlag London.


Khara H.,Islamic Azad University at Lahijan | Noveiri S.B.,International Sturgeon Research Institute | Dadras H.,Islamic Azad University at Lahijan | Rahbar M.,Islamic Azad University at Lahijan | And 2 more authors.
Comparative Clinical Pathology | Year: 2013

The motility and fertilizing ability of Aristichthys nobilis spermatozoa were studied. Activation solutions containing cations (Na+, K+, Ca+2, and Mg+2) were used to investigate the effect of ions on motility characteristics of spermatozoa (sperm movement duration and percentage of motile spermatozoa) and fertilizing capacity of sperm (fertilization rate, hatching rate, larvae length during hatching, larvae length during active feeding, and survival rate). The results showed that highest sperm movement duration is in solutions containing 99 mEq/L NaCl and 27 mg/dL KCl, respectively. Our results showed that solutions containing CaCl2 did not have impact on fertilizing capacity of spermatozoa compared to other ions. Among tested ions, solutions containing NaCl had more influence on fertilizing capacity of spermatozoa than other ions. Understanding the effects of these ions could be useful to the aquaculture industry and subsequently to the improvement of the quality of fish sperm during artificial reproduction. © 2012 Springer-Verlag London Limited.


PubMed | Sturgeon International Research Institute, Iranian Fisheries Research Organization IFRO, Instituto Zooprofilattico Sperimentale delle Venezie, University Putra Malaysia and 3 more.
Type: Journal Article | Journal: Virusdisease | Year: 2015

Mullets are dominant fishes in the catch composition in the southern coasts of the Caspian Sea and after (Rutilus frisii kutum Kamensky, 1901) have a worthy role in production of marine proteins and incomings of north provinces of Iran. Mullets stocks decreased dramatically in recent decades in the Caspian Sea and catch amount reached from 6446 MT on 2002 to 2151 MT in 2012. Mysterious mortalities occurred in wild mullet (Liza auratu) and (Liza saliens) in Iranian waters of Caspian Sea in recent years. Regarding to investigation of causative agent of mentioned outbreak about 322 suspected samples were collected from coastal capture sites of Iranian north provinces in 2008 till 2011. Moribund fish revealed skin darkening, erratic swimming, belly-up at rest and high distension of swim bladder. Target tissues such as brain and eye were removed and then fixed for histopathology and TEM assay. Widespread and massive vacuolation were observed in brain, spinal cord, retina and optical nerve and intracytoplasmic vacuoles and virus particles in retina. So concerning to clinical signs, histopathological and TEM findings, it could be concluded that nodavirus-like agent could be probable cause of mass mortality of wild mullet in Iranian waters of the Caspian Sea.


PubMed | Islamic Azad University at Lahijan and Inland Water Aquaculture Research Center
Type: Journal Article | Journal: Journal of parasitic diseases : official organ of the Indian Society for Parasitology | Year: 2014

A parasitological investigation was done on 175 specimens. Infections of A. brama orientalis were analyzed according to the age and sex. The fish also were examined for evaluation changes of haematological parameters in relation to parasitic infection. Four parasites were found, including-Caryophyllaeus laticeps and Ligula intestinalis (Cestoda), Diplostomum spathaceum (Platyhelminthes) and Trichodina sp. (Ciliophora). Among identified parasites maximum prevalence and mean intensity were related to Ligula intestinalis and Caryophyllaeus laticeps respectively. The values of prevalence and mean intensity showed significant differences among ages. Our results revealed prevalence, mean intensity and abundance had not significant difference between males and females. Parasite infection provoked reduction (P<0.05) in haematocrit, mean cell volume and lymphocyte. On the other hand, significant increase (P<0.05) in white blood cell (WBC), mean cell haemoglobin concentration and neutrophil in blood of infected fish was observed. Significant differences were detected for the WBC, lymphocyte and neutrophil (infected versus uninfected by Trichodina sp., Diplostomum spathaceum and Caryophyllaeus laticeps). In addition to WBC and lymphocytes, significant change was observed for the haemoglobin (Hb) (infected versus uninfected by Ligula intestinalis).

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