Time filter

Source Type

Sarpanah Sarkohi A.,Iranian Fisheries Research Organization | Ghasemzadeh G.R.,Iranian Fisheries Organization | Nezami S.A.,Iranian Fisheries Research Organization | Shabani A.,Gorgan University | And 3 more authors.
Iranian Journal of Fisheries Sciences | Year: 2010

Neogobius caspius is an endemic species of the Caspian Sea which plays an important role in food chain as a predatory fish. The main aim of this study was to investigate selected feeding characteristics of Neogobius caspius in the south west coasts of the Caspian Sea. Monthly sampling was carried out using a bottom trawler at three stations (Astara, Anzali and Chabuksar) in three depths (0-5, 5-10 and 10-15m) on a monthly basis from October 2004 to September 2005. Relative gut length (RLG) was less than one suggesting that this species is carnivorous. RLG was significantly lower in older fish but gut length was longer (P<0.05). Intensity of fullness was below the favorite degree (IF<400) from October to March, however, it was higher (400


Saghali M.,Iranian Fisheries Organization | Hoseini S.M.,Gorgan University of Agricultural Sciences and Natural Resources | Hosseini S.A.,Gorgan University of Agricultural Sciences and Natural Resources | Baqraf R.,Azerbaijan Oil Company
Bulletin of Environmental Contamination and Toxicology | Year: 2014

The aim of the present study was to determine zinc (Zn), chromium (Cr), cadmium (Cd) and lead (Pb) content of benthic fauna in the southeast coast of the Caspian Sea, where the major fish restocking programs are conducted. Seasonal sampling was performed in three sampling sites: north Miankaleh (NM), south Miankaleh (SM) and Gharesoo coast (GC). Results showed that sampling sites, sampling seasons and sampling sites × sampling seasons interaction had a significant effect on the heavy metal levels (p < 0.05). The yearly heavy metal concentration order was as follows: Zn > Pb > Cd > Cr. Yearly Pb levels of the NM site were significantly higher than the other sites. Also, yearly Cr levels of the SM site were significantly higher than site GC. Comparison of the benthos heavy metal levels with the available reference values suggests that the benthos tissues might be highly polluted which can intoxicate the fish feeding on them. © 2013 Springer Science+Business Media New York.


Kazemi S.H.,Gorgan University of Agricultural Sciences and Natural Resources | Paighambari S.Y.,Gorgan University of Agricultural Sciences and Natural Resources | Aydin C.,Ege University | Sensurat T.,Ege University | Naderi R.A.,Iranian Fisheries Organization
Turkish Journal of Fisheries and Aquatic Sciences | Year: 2016

Square mesh windows (SMWs) with 75 (75SMW; 37.5 mm bar length) and 90 mm (90SMW; 45 mm bar length) nominal mesh size were tested for determining size selectivity in dhow prawn fisheries of the Persian Gulf (Hormuzgan province). Fishing trials were conducted on the commercial fishing grounds of Hormuzgan province of the northern Persian Gulf by commercial dhow trawler. Covered codend methods were utilized for collecting data during October and November 2012. Totally 21 and 16 valid hauls were performed with 75SMW and 90SMW, respectively. The mean L50 values of 75SMW and 90SMW were fond as 3.6 ± 0.03 and 3.7 ± 0.02 cm carapace length for banana prawn (Penaeus merguiensis) 2.9 ± 0.03 cm and 2.9 ± 0.05 cm carapace length Jinga shrimp (Metapenaeus affinis), 8.0 ± 0.08 cm and 9.5 ± 0.11 cm ork length for Indian ilisha (Ilisha melastoma), and 8.1 ± 0.04 and 8.4 ± 0.03 cm fork length of sulphur goatfish (Upeneus sulphurous), respectively. This study clearly shows that there is not any notable different in size selectivity of square mesh windows with different mesh sizes for investigated species. Future studies on different by-catch reduction methods such as full square mesh codends or grids should improve size selectivity of the species and efforts to reduce by-catch in this fishing system. © Published by Central Fisheries Research Institute (CFRI) Trabzon, Turkey.


Peykaran Mana N.,International Sturgeon Research Institute | Vahabzadeh H.,Islamic Azad University at Lahijan | Hafezieh M.,Iranian Fisheries Research Organization | Seidgar M.,Iranian Artemia Reference Center | And 2 more authors.
Iranian Journal of Fisheries Sciences | Year: 2011

In order to introduce the best strain of Iranian Artemia cyst to larvicultural feeding of aquatic animals, biometrical characteristics of Artemia cysts and newly hatched nauplii of four different geographical regions of Iran (Maharloo Lake, Fars province, Meyqan Lake, Central province Urmia Lake and Fesendooze pond West Azarbaijan province) were determined. Whole cysts and decapsulated cyst diameters, chorion thickness, dry weight and total length of newly hatched nauplii were measured under stereomicroscope equipped with Motic 2000 software MLC - 150C, attached to a monitor. The obtained data were statistically analyzed by one way ANOVA and tested with multivariate Duncan test. The results showed that Artemia urmiana cyst has a significantly larger diameter and nauplius total length than the other cysts (P<0.05) (285.4 ± 0.53 μm and 511.8± 1.27 μm, respectively). Although the chorion thickness of the Meyqan cyst is higher than the others there are not any significant differences between them (P>0.05). The smallest cyst diameter (276.8± 0.58 μm), nauplii total length (491.2±1.17 μm) and consequently the largest number of cysts per gram were obtained from Fesendooz. Due to the suitable size of Artemia samples for shrimp post larvae, ornamental and marine fish larval stage feeding it could be a good candidate for replacing imported expensive cysts.


Ghanbari M.,University of Natural Resources and Life Sciences, Vienna | Ghanbari M.,University of Zabol | Shahraki H.,Iranian Fisheries Organization | Kneifel W.,University of Natural Resources and Life Sciences, Vienna | Domig K.J.,University of Natural Resources and Life Sciences, Vienna
Symbiosis | Year: 2016

This study addresses the biodiversity profile of bacterial community in the intestinal lumen and mucosa of snow trout fish by applying 16S rRNA gene 454-pyrosequencing. A total of 209,106 sequences with average length 689 (±53) were filtered, denoised, trimmed, and then sorted into OTUs based on 97 % sequence similarity using the USEARCH software pipeline. Bacteria representing 10 phyla were found in the samples investigated. Fimicutes ribotypes were present in intestinal-mucosa and lumen in all fish and often dominated the libraries (average 43 and 38 %, respectively). Proteobacteria were also prevalent, but at a lower relative abundance, at 22 and 29 % in mucosa and lumen, respectively. The autochthonous microbiota was dominated by sequences belonging to the Bacilli (mean sequence abundance 24 %), in particular the Lactobacillaceae, with Lactobacillus and Pediococcous being the most abundant genera. Fewer Bacilli (mean sequence abundance 22 %) and Actinobacteria (2 %) were present in the lumen, and allochthonous communities consisted of a more even split among the bacterial classes, with increases in sequences assigned to members of the γ-Proteobacteria (16 %) and Fusobacteriia (8 %). The principal bacterial genera recorded in the lumen belonged to the lactic acid bacteria group, Cetobacterium, Clostridium and Synechococcus. Results obtained suggest that the lumen and mucosal layer of the snow trout intestine may host different microbial communities. Moreover, both regions harbour a diverse microbiome with a greater microbial diversity in the intestinal mucus compared with the luminal communities of the fish. Many of these microbes might be of high physiological relevance for the fish and may play key roles in the functioning of its gut. © 2016 Springer Science+Business Media Dordrecht


Sahafi Hosseinzade H.,Iranian Fisheries Research Organization | Khaje Rahimi A.,Islamic Azad University | Askari F.,Islamic Azad University | Bashti T.,Iranian Fisheries Organization | Zargham D.,Iranian Fisheries Organization
Advances in Environmental Biology | Year: 2011

In many species of finfish, females exhibit higher growth rates than males and achieve larger sizes. In addition, in some species, males mature before reaching marketable size. Therefore, there is great interest from the fish farmers to produce all-female stocks. In this project tried to reversing the sex of rainbow trout larvae by 17β estradiol and direct method, further more finding the optimum dose of this natural estrogen for endocrine sex reversion of Rainbow trout (O. mykiss). Four experimental treatments were designed with doses of 10, 20, 30 and 40 mg/kgf. Trout which treated with 40 mg/kgf yielded 96% female and greatest growth.


Hosseinzadeh Sahhafi H.,Iranian Fisheries Research Organization | Negarestan H.,Iranian Fisheries Research Organization | Nafari Yazdi M.,Islamic Azad University at North Tehran | Shakouri M.,Iranian Fisheries Organization | Farahani R.,Iranian Fisheries Organization
Advances in Environmental Biology | Year: 2011

A Twelve-month(January 2010 to December 2010) trial was conducted to compare the important water chemical parameters between inlet and outlet of rainbow trout farms, to assces their effects on fish growth and production. There were 12 sampling stations in(Inlet and outlet of rainbow trout) six fish farms along the Haraz river. Nitrite, nitrate, ammonium, sulphide and phophate were measured by a digital portable photometer and weight of fishs were measured by a digital balance sheet and farm product in by quastionary. The results show, concentration of nutrients in outlet were more than inlet of farms and there are significant different between Twelvestations (p<0.05).Exception phosphate, upstream farms had lower value than downstream. Growth biological indexes were measured for estimating correlation and relationship between concentration of nutrients and growth biological indexes. We observed farm 5th had the lowest FCR and the most SGR. Correlation between Daily growth, SGR, FCR, production and chemical parameters of water were analysed by SPSS and Pearson Correlation. The results revealed, there are negative correlation (at the 0.01 level) between nitrite and Daily growth (P=0.004, Pearson Correlation= -0.24),ammonium and SGR (P=0.0001, Pearson Correlation= -0.272), but for FCR and production and chemical parameters there aren't any correlation (P>0.05).


Hosseinzadeh Sahhafi H.,Iranian Fisheries Research Organization | Nafari Yazdi M.,Iranian Fisheries Organization
Iranian Journal of Fisheries Sciences | Year: 2014

Monthly samples of six fish farms from January 2010 to December 2010 in the northern Iran, Haraz River, were used to determine relationship between chemical parameters of main water, inlet and outlet and their effects on fish growth and production. Results revealed that concentration of nutrients in outlet was more than that of inlet of farms and statistical analysis showed that there were significant differences between stations (p<0.05). The amount of phosphate in upstream farms was lower than that of downstream. There was statistically significant difference between nitrite nitrates, concentrations in different months. Total sulphide, phosphate and ammonium in inlets were 0.002±0.009 (mg/l), 0.215±0.113 (mg/l) and 0.022±0.018 (mg/l) respectively. In outlets there was 0.003±0.009 mg/l sulphide, 0.302±0.193 mg/l phosphate and 0.037±0.026 mg/l ammonium. Ammonium concentration, showed no significant difference (p>0.05) in different months Correlation between daily growth, SGR, FCR, production and chemical parameters of water were analyzed by Pearson Correlation. The results revealed negative correlation (á= 0.01) between nitrite and daily growth (P=0.004, Pearson Correlation=-0.24), ammonium and SGR (p=0.0001, Pearson Correlation=-0.272), although there were no correlation for FCR, and nutritional parameters (p>0.05).

Loading Iranian Fisheries Organization collaborators
Loading Iranian Fisheries Organization collaborators