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  • 1
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    Publication Date: 2015-12-01
    Print ISSN: 0920-4105
    Electronic ISSN: 1873-4715
    Topics: Chemistry and Pharmacology , Geosciences , Process Engineering, Biotechnology, Nutrition Technology
    Published by Elsevier
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  • 3
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    Publication Date: 2021-05-19
    Description: In this study, a total of 60 juvenile Acipenser persicus (mean weight 410±267.6, mean length 39.6±19.6 cm and 1 - 2 year old) were captured by trawling method at depths of 20 to 100 meters in the Mazandran province via 7 times surveys during 2009 – 2012, and studied immunologically. Results showed that the mean of red blood cells (RBC) and white blood cells (WBC) were 585000 ± 151000 and 30300 ± 3200 per mm3 of blood, respectively. Mean percentage of lymphocyte, monocyte, neutrophile and eozynophile were 83.1 ± 12, 2.9 ± 2, 8.3 ± 6.6 and 5.6 ± 3.2 %, respectively. Mean concentration of Immunoglobin M (IgM) in blood serum was 25.6 ± 8.7 mg/dl. Samples showed no significant difference in length (P〉0/05). These results showed that the fish by less than the length classes were more sensitive to environmental changes. For this reason, their immune indices improved. Therefore, any change in fish blood immunological factors can lead to the secondary response.
    Description: Published
    Keywords: Acipenser persicus ; RBC ; WBC ; IgM ; Persian sturgeon ; Immunological ; Blood ; Juvenile ; Depths ; Fish ; Length
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.191-202
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  • 6
    Publication Date: 2021-05-19
    Description: Sturgeons are valuable species of the Caspian Sea and the Persian sturgeon Acipenser persicus is an endemic species of the south Caspian Sea. Possessing the highest breeding percentage in sturgeon hatcheries and catch numbers of this species is of particular importance in Iran regarding rehabilitation of stocks and fingerling release. The main aim of this study was to understand the histological structure of this valuable species and to make use of this information in other basic and applied research. The present study was conducted from 1998 through 2001 on a total of 34 A. persicus specimens (18 male and 16 female) with an average weight of 13.75 kg and an average length of 146.3 cm. Fishes under study were caught using gillnets and beach seine in the fishery zones 1 and 2. Biometric measurements of fish specimens were carried out on catch and primary gonadal staging was assessed by means of macroscopic examination. Tissue samples including gill (primary and secondary ray), male and female gonads (anterior, central and posterior), digestive tract (oesophagus, stomach and intestine), liver (different parts of the large and small lobules) and kidney (anterior, central and posterior) measuring a few millimeters in thickness and a few millimeters in width were prepared and fixed individually in buoin solution. Tissue samples were dehydrated in different dilutions of alcohol and chloroform solution until they were clear. They were then embedded in paraffin and sectioned at 5-7 µm using a Leitz microtome and stained following the hematoxylin and eosin (H & E) method. Distinct samples were photographed using a light microcopy in 10 microscopic fields. The microscopic examination of gills revealed the presence of chloride cells, secondary cartilage, erythrocytes, gill lamella, epitheleum, polar cells, respiratory cells and respiratory spines. Ovary in A. persicus was similar in structure with that of other sturgeons and a major part of it was comprised of stroma tissues. Follicles were the main structural and functional indices in ovary. The main distinguishing feature of the ovary in the early stage of growth is the presence of ovarian grooves in gonads. Grooves were observed in stage I of sexual maturity and oogonia were seen in the primary growth of protoplasmic ovary. They are attached densely to the dorsal part of the abdominal cavity and their development is slow. Oocyte cells are observed assembled in ovary sacs. In the II stage of maturity gonads are yellow to pink in color with distinct lateral folds. Fat tissue is the main energy source for oocytes. Duration of this stage is very long. Primary oocytes are single layered, follicle shaped and could be observed with naked eyes as white spots in an ovary section. The III stage of maturity is characterized with trophoplasmic growth of oocytes, reduction in fat reserves, increase in oocyte volume, appearance of pigments under cell membranes and growth of arc cilia on gelatinous part of follicles. Nucleus is located away from the center and surrounded by several nucleoli. The granulosa layer occurs at this stage. In the IV stage of maturity oocytes growth is increased and nucleus is seen migrating toward the animal pole. Tiny yolk granules are observed in the animal pole and larger yolk granules and fat droplets in the vegetative pole. Growth of external layers of oocyte continues while protoplasmic growth is completed at this stage. At this stage germinal vesicle reaches its final growth and oocyte is covered with follicle, jelly coat, zona radiata external, zona radiata internal, fatty layer and pigments. The stage V of maturity is characterized with intensive bleeding in ovaries, residues of non-ovulated oocytes, appearance of stage II oocytes and decomposition of residues of non-ovulated oocytes. In the stage VI of maturity oocytes resembling stage II of maturity are clearly observed. Ruptured follicles, pigment reserves and oocytes representing various maturity stages are also present. Testis in Persian sturgeon in the first stage of maturity includes spermatogony cells in its germinal parts. Male gonads are situated along notochord and attached to the dorsal diaphragm or primary area of kidney formation through short mesenchymes. In stage II of male gonad maturity, spermatogonia cells are situated in gonad channel walls in a single layer without wrinkles. Primary and secondary spermatocytes and sertoli cells are present. In stage III of male gonad maturity, spermatogony cells intensively divide and reproduce. Blood vessels are observed in the form of condensed blood cells. Development and formation of primary and secondary spermatocytes, meiotic divisions and presence of spermatids are characteristics of this stage. Stage IV is distinguished by an active cycle of spermatogenesis, further meiotic divisions and entrance of sperms into the sperm channels. In stage V intensive bleeding occurs in testis. Spermatozoids, sperm channels and numerous blood vessels are also observed in this stage. In stage IV of male gonad maturity large epithelial cells of follicle and emptied sperm channels are observed. Kidney in Persian sturgeon is comprised of three sections; anterior (pronepherose including malpighian bodies and nephritic segments) middle and posterior parts. Nephrons include malpighian bodies, glomerula, Buman capsule, renal tubes or urinary tubes, neck part, spiral section, middle part, distant spiral section and shows various patterns in microscopic histological studies. Liver tissue is composed of hepatocytes, biliary tubes, lymphatic vessels, liver capillaries or sinusoid, kupfer cells and liver cells. Liver cells are roughly circular and polygonal in structure with a single and distinct nucleus and single nucleolus. Endoplasmic reticulum and other essential cell organs are present in its cytoplasm and considerable fat and glycogen reserves are observed in cell cytoplasm. Therefore large numbers of theses vacuoles are observed in a stained liver cells. Pancreas in Persian sturgeon is comprised endocrine and exocrine parts. The exocrine part releases pancreatic excretions and the endocrine section (Langerhans islands) releases hormones. The digestive system is comprised of alimentary canal that includes the mouth, pharynx, esophagus and intestine with epithelial and muscular layers. The epithelial layer sustains epithelial coat, parenchyma, condensed layer, muscular epithelium, sub- epithelial layer, muscular layer including ring and longitudinal layer and serum membrane. The pharynx epithelium is stratified in anterior part and simple in posterior part. Epithelial cells of pharynx include mucus like matrix in cytoplasm. These cells lack muscular epithelium and a complex and condensed connecting tissue is present beneath the epithelium. Stomach has two independent sections of glandular structure for collecting food and commencement of chemical digestion and non-glandular structure with strong muscular layer specified to create stomach movement and mechanical digestion. Epithelial parts are simple or wrinkled in structure. Intestine stretches from the pyloric section of stomach to the anal part and includes duodenum, anterior and posterior intestine and rectum. Duodenum is a part of intestine where biliary canals, pancreas and pyloric ceaca enter. Intestinal epithelium is comprised of a single layer of stretched columnar cells that encompasses epithelial cells. Rectum is the last section of intestine and a sphincter separates it from posterior intestine. Anal is the terminal opening of the alimentary canal. Goblet shaped epithelium cells are observed in epithelial structure of rectum while simple tubular glands without large intestinal branched glands are present in Parin. Results obtained in this study along with characterizing microscopic structure of studied organs in Persian sturgeon facilitated implementation of other related specific researches.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Histology ; Gill ; Gonad ; Kidney ; Liver ; Digestive organ ; Persian sturgeon ; Acipenser persicus ; Species
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 73pp.
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  • 7
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    Islamic Azad University, Science and Research Branch, Tehran, Marine Biology
    In:  http://aquaticcommons.org/id/eprint/20454 | 17408 | 2016-07-18 01:08:03 | 20454 | Islamic Azad University, Science and Research Branch, Tehran
    Publication Date: 2021-07-10
    Description: The ecophysiological effects of stress in female Persian sturgeon, Acipenser persicus brood fishes during catch, transport and their confinement in the Kurenski ponds at the Shahid Dr. Beheshti Fish Propagation and Rearing Center were studied. The brood fishes under study were caught at three catch stations located at the Sefidrud River, Sefidrud River estuary and Gorganrud River estuary and were held in ponds at the Shahid Marjani Fish Propagation and Rearing Center.
    Description: PhD
    Description: Advisors:Sh., Oryan; Counsellors: Gh., Vosoughi; M. Pourkazemi
    Keywords: Aquaculture ; Biology
    Repository Name: AquaDocs
    Type: thesis
    Format: application/pdf
    Format: application/pdf
    Format: 302
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  • 8
    Publication Date: 2021-06-25
    Description: In this study, a total of 60 juvenile Acipenser persicus (mean weight 410±267.6, mean length 39.6±19.6 cm and 1 - 2 year old) were captured by trawling method at depths of 20 to 100 meters in the Mazandran province via 7 times surveys during 2009 – 2012, and studied immunologically. Results showed that the mean of red blood cells (RBC) and white blood cells (WBC) were 585000 ± 151000 and 30300 ± 3200 per mm3 of blood, respectively. Mean percentage of lymphocyte, monocyte, neutrophile and eozynophile were 83.1 ± 12, 2.9 ± 2, 8.3 ± 6.6 and 5.6 ± 3.2 %, respectively. Mean concentration of Immunoglobin M (IgM) in blood serum was 25.6 ± 8.7 mg/dl. Samples showed no significant difference in length (P〉0/05). These results showed that the fish by less than the length classes were more sensitive to environmental changes. For this reason, their immune indices improved. Therefore, any change in fish blood immunological factors can lead to the secondary response.
    Keywords: Biology ; Chemistry ; Fisheries ; Caspian Sea ; Acipenser persicus ; RBC ; WBC ; IgM ; iran ; blood ; immunological ; juvenile ; Mazandaran ; immune
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 191-202
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  • 9
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    In:  http://aquaticcommons.org/id/eprint/24764 | 18721 | 2018-08-05 16:25:52 | 24764 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-15
    Description: The present study was conducted on a large number of oocytes collected from 36 female Acipenser stellatus brood fish caught from fishing grounds in the Guilan province and transferred to the Shahid Behesti Sturgeon Breeding Center during 1997-1998. Physiological assessments were carried out on the microscopic sections prepared from these oocytes. Under normal conditions, 9 distinguishable layers were observed in the sections prepared from A. stellatus oocytes that included the follicle, the outer most layer, followed by a jelly coat, an external zona radiata, internal zona radiata, fat layer, pigments, cytoplasm, nucleus and nucleoli. The presence of erythrocytes and micropyle canal in the oocytes indicate normal embryognesis among them.
    Keywords: Biology ; Acipenser stellatus ; Sturgeon ; Histology ; Oocyte ; Caspian Sea ; Guilan Province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 93-102
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  • 10
    Publication Date: 2021-05-19
    Description: The present study was conducted on a large number of oocytes collected from 36 female Acipenser stellatus brood fish caught from fishing grounds in the Guilan province and transferred to the Shahid Behesti Sturgeon Breeding Center during 1997-1998. Physiological assessments were carried out on the microscopic sections prepared from these oocytes. Under normal conditions, 9 distinguishable layers were observed in the sections prepared from A. stellatus oocytes that included the follicle, the outer most layer, followed by a jelly coat, an external zona radiata, internal zona radiata, fat layer, pigments, cytoplasm, nucleus and nucleoli. The presence of erythrocytes and micropyle canal in the oocytes indicate normal embryognesis among them.
    Description: Published
    Keywords: Physiological ; Acipenser stellatus ; Sturgeon ; Histology ; Oocyte ; Female ; Brood ; Fishing ; A. stellatus
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.93-102
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