An investigation on abundance and distribution of Mnemiopsis leidyi in Guilan waters, southwest Caspian Sea
S.
Bagheri
Anzali
author
text
article
2005
per
The alien ctenophore Mnemiopsis leidyi which was transported from the Black Sea into the Caspian Sea by the end 1990s has since affected this new ecosystem. We studied the spatial and temporal distribution of the ctenophore from July 2001 to July 2002 in three transects located in Lisar, Bandar Anzali and Sefidroud, in Guilan province. Four stations were established in each transect at a 5, 10, 20 and 50 meter bottom depth contours. Maximum observed biomass of the organism was 221.3±91g/m2 in October 2001 and the minimum was 8.3±3.8g/m2 in December 2001. The highest biomass of the organism was detected in the upper 0-20m water layer in areas 50 meters deep achieving 145.36± 67.33g/m2. The lowest biomass was in the 20-50 layers in areas 50 meters deep amounting to 1.9±0.95g/m2. Small specimens less than 10 mm comprised about 97% of the sampled population and the maximum length measured at 51-55mm. The largest average biomass was 112.3±48g/m2 detected in Lisar and the smallest biomass in the range 67.17±46.8g/m2 was seen in Anzali region. It was concluded that temperature, depth, salinity and food availability affected the distribution of Mnemiopsis leidyi in the sampled areas. It is also expected that the high biomass of the organism detected in the region may have significant effects on pelagic ecosystems of the Caspian Sea.
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
14
v.
4
no.
2005
1
16
https://isfj.areeo.ac.ir/article_113869_21f007d01953617f5c982280302c0fe7.pdf
dx.doi.org/10.22092/isfj.2005.113869
Cryopreservation of carp spermatozoa by different extenders
Sh.
Baradaran noveiri
Rasht
author
M.
Porkazemi
Rasht
author
P.
Kochinin
Ahvaz
author
V.
Yavari
Ahvaz
author
text
article
2005
per
Production and storage of the best gametes are practices undertaken by fishery managers and researchers to improve fish reproduction technology and obtain the best spawners. The male spawners of carp (Cyprinus carpio) were chosen from two warm-water fish hatcheries near Rasht, Guilan Province. For the study, duration of motility of sperms, sperm density and fertilization rate were considered.
The best samples were chosen for cryopreservation with four different extenders and were checked by fertilization tests after seven days preservation in liquid nitrogen. Results showed that by 1:1 dilution rate, the Alsever’s solution had the best results. The fertilization rate, production of eyed eggs and larvae by this extender in a multistage cooling experiment were 45%, 47.81 and 22.63% respectively.
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
14
v.
4
no.
2005
17
30
https://isfj.areeo.ac.ir/article_113870_b8df6d078724c1bcd0858c00ca7c5a0e.pdf
dx.doi.org/10.22092/isfj.2005.113870
A new method for artificial breeding of Acipenser stellatus
M.
Bahmani
Rasht
author
R.
Kazemi
Rasht
author
M.
Pordehghani
Rasht
author
A.
Halajian
Rasht
author
Y.
Vahhabi
Rasth
author
M.
Mohseni
Rasht
author
R.
Malakzad
Rasht
author
S.
Dazhandian
Rasht
author
H.
Mohmmadi parshokohi
Rasht
author
text
article
2005
per
A new formulation of GnRH and synthetic compound of anti-dopamine domperidone was used for the first time in Iran to determine suitable physiological indexes for reproduction and to resolve the present problems of artificial reproduction in stellate sturgeon Acipenser stellatus. The study was conducted on 60 breeder Acipensers including 40 female and 20 male specimens. The fish were caught at stations in the vicinity of the SefidRud River in Guilan Province. Male spawners were treated using single injection method while females received dual injection (Bio-physiological control).
Propylene glycol (PG) was administered after the muscular injection near the second dorsal scute to increase the viscosity of the solution during absorption. Depending on the stage of sexual maturity in the fish, GnRH at doses of 5, 10, 15, 20, 30 µg/kg BW was used in combination with a dose of I or 2 mg kg of domperidone.
The position of G V was used as an index to determine sexual maturity in females while in males sexual maturity was determined on the basis of testis and sperm quality. The female fish showed GV in a range of 3.64 to 14.30. The results indicated that reduction of stress during catch, transportation, maintenance and handling and selection of breeders with suitable morphology will result in increased reproduction success.
It was also found that male breeders given a dose of 20 and 30 µg/kg BW GnRH along with 1 and 2 mg kg of domperidone respectively were the most successful in spermiation. For female breeders, those received a dose of 10, 15 and 20 µg/kg BW GnRH along with 2 mg/kg of domperidone exhibited the most suitable conditions in ovulation. These females responded well to artificial breeding provided they possessed G V in the range of 3.64 to 14.30 depending on the water temperature until the germinal vesicle broke down (in vivo).
Alleviating stress during capture, handling, transport and confinement, selecting breeders with suitable morphology and identifying correct stage of sexual maturity are the factors that help achieve higher production by substituting GnRH with a combination of GnRH and domperidone. Therefore, this compound is recommended as a suitable substitute for pituitary extract and other gonadotrophic analogues in the artificial breeding of Acipenser stellatus.
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
14
v.
4
no.
2005
31
48
https://isfj.areeo.ac.ir/article_113873_85d1f559167f18a04591b5121a18ea17.pdf
dx.doi.org/10.22092/isfj.2005.113873
An investigation on fish infection with Diplostomum spathaceum in Amirkalayeh Wetland
H.
Khara
Lahijan
author
Sh.
Nezami
tehran
author
M.
Sattari
Guilan
author
F.
Mir hashemi nasab
Anzali
author
A.
Mosavi
Anzali
author
text
article
2005
per
Infection Diplostomum spathaceum parasite is studied in 660 fish specimens from Amirkalayeh wetland of Guilan Province. We collected samples of fish belonging to Esox lucius (78 pieces), Perca fluviatilis (163 pieces). Tinca tinca (105 pieces), Silurus glanis (64 pieces). Carassius auratus 64 pieces. Blicca bjoerkna (95 pieces) and Rutilus rutilus (91 pieces) since spring to winter 2001 We found the highest infection rate in Rutilus rutilus (63.33%) while the lowest was seen in Silurus glanis (3.13%). The highest and lowest average infection severity were detected in Rutilus rutilus (13.49±10.82), and Tinca tinca (l respectively. The highest parasite abundance was related to Rutilus rutilus (7.04±0.93), and the lowest abundance was observed in Tinca tinca (0.06±0.27). Parasite count range was most in Rutilus rutilus (1-49), and least in Tinca tinca (1-2). Statistical analyses revealed significant differences in species, age, sex and season as related to the infection with the parasite.
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
14
v.
4
no.
2005
49
66
https://isfj.areeo.ac.ir/article_113874_5a32a89824bbd92fc8af1d44b371abe3.pdf
dx.doi.org/10.22092/isfj.2005.113874
Economic analysis of sturgeon fingerling production in Iran
H.
Salehi
tehran
author
text
article
2005
per
This study was conducted to provide procedures for increasing the productivity and profitability of sturgeon culture in Iran. We designed a questionnaire covering economic and ecologic aspects of the activity and distributed it to an expert team comprised economists, statisticians and aquaculturist experts. The team completed the questionnaires to determine the costs of production ofa single sturgeon fingerling in Iran, considering all sturgeon centers. Also, documents available in different sections of Iranian Fisheries, specially, accounting, budgeting and stock enhancement offices were resorted to. Cost of labour comprised 55% of expenditures whereas costs of feeding and fertilizer were found to be 14%. The maintenance cost was assessed as 7% and fertilized eggs cost was 6%. Results showed that on average, the production cost of a single sturgeon fingerling in Iran in the year 2000 was 992 Rls. Among all of the sturgeon breeding centers in Iran, Shahid Rajaee Aquaculture center had the lowest cost of production with 477 Rls. while Shahid Beheshti center had the highest cost amounting to 1224 Rls. The cost of labour has a large share in total expenditures, somewhat caused by the center not being active for six months each year. Tasking the labour force with other activities might reduce the total costs in such hatcheries.
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
14
v.
4
no.
2005
67
80
https://isfj.areeo.ac.ir/article_113875_12f73bdfe1004d029125cf59afd72a72.pdf
dx.doi.org/10.22092/isfj.2005.113875
Effects of weight on osmoregulatory ability of Salmo trutta caspius juveniles
M.
Sayad borani
Rasht
author
B.
Abtahi
Noor
author
M.
Bahmani
Rasht
author
R.
Kazemi
Rasht
author
S.
Dazhandian
Rasht
author
J.
Daghigh rohi
Rasht
author
A.
Amiri
Rasht
author
text
article
2005
per
Salmo trutta caspius is a commercial migratory fish species in the Caspian Sea. Over fishing and deterioration of natural spawning grounds of the species are two major causes depressing stocks of the fish in the Sea. Thus, artificial breeding and release of salmon juveniles into the Caspian Sea is now considered an urgent need towards the rehabilitation of the stocks of the fish.
This study was conducted in early 2004 to determine the ideal weight for the release of salmon fry in order to increase fishery return coefficients in the species. For this research, we used facilities of the Marine Fisheries Breeding and Research Center in Ghazian, along the coastal areas of the Bandar Anzali. Salmon juveniles used in this study belonged to the same generation. Fishes belonging to different weight classes (5, 10, 15 and 20g) were selected in a random design and stocked in two groups of sea water at 7% salinity and freshwater. Osmosis was studied using blood samples collected at 0, 3, 6, 12, 24, 72, 168 and 240 hours. Heparin tubes were used for sampling blood which was centrifuged to separate blood plasma. Osmotic pressure was determined using osmometer.
Statistical analysis of the results on variations in osmotic pressure showed that after 10 days of stocking fish in seawater (7%), fishes in all weight classes were capable of osmoregulation. Also fishes in weight classes 10, 15 and 20g were capable of osmore-gulation in the Caspian Sea water.
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
14
v.
4
no.
2005
81
96
https://isfj.areeo.ac.ir/article_113876_01229be1c1821bbe2feb049661321d79.pdf
dx.doi.org/10.22092/isfj.2005.113876
An audit of sturgeon reproduction in Iran over the years 1998-2002
H.
Abdolhai
tehran
author
H.
Baradaran tahori
tehran
author
R.
Amini
tehran
author
text
article
2005
per
Iranian Fisheries Institutes in the north of the country are involved in the reproduction, culture and release of five species of sturgeon fingerlings into the Caspian Sea. The species are Acipenser persicus, A. guldenstadti, A. nudiventris and A. stellatus and Huso huso. Shahid Beheshti Fisheries Centre as the first commercial hatchery started its activities in 1972 in Rasht, Guilan Province of Iran. The center achieved a production ceiling of 21.6 million fingerlings in 1997 and increased it to 24.5 million fingerlings in 1998. It is anticipated that the center will achieve a threshold of 45 million fingerlings in the next few years. During 1997-2002, the center has increased its extent from 377 hectares to 887 hectares.
For Huso huso production, 17 specimens were caught in 1998, of which 10 were injected that produced 1.08 million fingerlings and in 2002, the number of caught and injected Huso huso were 29 and 21 respectively, that resulted in production and release of 2.4 million fingerlings.
A number of 1062 A. persicus breeders were caught in 1998 of which 581 individuals were injected with hypophysis extract resulting in production and release of 22.5 million fingerlings. Of 538 injected individuals from among a total 802 breeder fish caught in 2002, a number of 12.3 million fingerlings were produced and released into the sea.
The catch for Acipenser stellatus in 1998 was 193 breeders that produced 623000 fingerlings. In 2002, the catch increased to 290 breeders, of which 67 received injections to produce 1.3 million fingerlings.
A total number of 0.67 million fingerlings of A. guldenstadti was produced in 1998 which was increased to 1.78 million in 2002. For Acipenser nudiventris, the number of fingerlings produced in 1998 was 0.4 which was increased to 1.56 million in 2002.
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
14
v.
4
no.
2005
97
112
https://isfj.areeo.ac.ir/article_113877_3648132f57e3277e005e661b89f611eb.pdf
dx.doi.org/10.22092/isfj.2005.113877
Comparative study on gonad development in Rainbow Trout (Oncorhynchus mykiss) reared in fresh and brackish water in the Yazd Province
A.
Falahti marvast
Bushehr
author
B.
Majazi amiri
Karaj
author
M.
Alizadeh
Tonekabon
author
B.
Abtahi
Noor
author
text
article
2005
per
Rainbow trout (Oncorhynchus mykiss) weighting 200±5 grams were used in this study to compare their gonad development in fresh and brackish water in Yazd Province.
The culture period lasted 140 days from October to March 2003 during which time the temperature (13.8±0.6), pH (8.18±0.12) and dissolved oxygen (6.2±0.1 1) of fresh and brackish water were kept nearly constant. The salinity of fresh and brackish water was 0.4 -0.5 and 14.3-14.7ppt respectively. The fish were fed common commercial trout food (Chineh GFT2) based on temperature and biomass.
Histological studies indicated that the gonad development is accelerated in brackish water where the males mature two month earlier than those reared in freshwater. The Gonadosomatic index (GSI) also affirmed the gonad development (P<0.05).
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
14
v.
4
no.
2005
113
126
https://isfj.areeo.ac.ir/article_113878_165875377935a28dc2c5323a97806d0b.pdf
dx.doi.org/10.22092/isfj.2005.113878
Isolation and identification bacteria and fungi of spoilage in Kilka meal production in Guilan Province
M.
Faeid
Anzali
author
N.
Amir mozafari
Lahijan
author
A.
Shojaei arani
Lahijan
author
text
article
2005
per
We Collected 75 samples from fish meal factories in Guilan Province (codes: 1,2,3,4,5,6,7) based on two times per month during June to December 2001. Standard reference are used in bacterial and fungous identification. The isolated bacteria are E. coli Proteus spp., Citrobacter spp., Shigella spp., Enterobacter Aerogenes Salmonella spp., Klebsiella spp., Hafina Alvei Yersinia Enterocolitica, Edwardsiella spp., Staphylococcus spp., Bacillus spp., Pseudomonas spp., Clostridium spp., Aeromonas Hydrophila Streptococcus spp. The highest and lowest bacterial contamination observed in E. coli and Hafina Alvei respectively. The most important isolated fungi were Aspergillus spp., Penicillium spp., Yeasts Rhizopus spp. The maximum and minimum fungi decay in samples were Penicillium spp., and Rhizopus respectively. The most and the least microbial spoilage have been seen in factories 1 and 2 respectively.
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
14
v.
4
no.
2005
127
138
https://isfj.areeo.ac.ir/article_113879_758b0aa5d53575650553829db964aba9.pdf
dx.doi.org/10.22092/isfj.2005.113879
Effect of synthetic juvenoid hormone (Pyriproxyfen) on the larval stages and survival rates of fresh water prown (Macrobrachium rosenbergii)
F.
Ghasemzadeh
Mashhad
author
A.
Moghimi
Mashhad
author
A.
Lotfi
Mashhad
author
text
article
2005
per
We Collected 75 samples from fish meal factories in Guilan Province (codes: 1,2,3,4,5,6,7) based on two times per month during June to December 2001. Standard reference are used in bacterial and fungous identification. The isolated bacteria are E. coli Proteus spp., Citrobacter spp., Shigella spp., Enterobacter Aerogenes Salmonella spp., Klebsiella spp., Hafina Alvei Yersinia Enterocolitica, Edwardsiella spp., Staphylococcus spp., Bacillus spp., Pseudomonas spp., Clostridium spp., Aeromonas Hydrophila Streptococcus spp. The highest and lowest bacterial contamination observed in E. coli and Hafina Alvei respectively. The most important isolated fungi were Aspergillus spp., Penicillium spp., Yeasts Rhizopus spp. The maximum and minimum fungi decay in samples were Penicillium spp., and Rhizopus respectively. The most and the least microbial spoilage have been seen in factories 1 and 2 respectively.
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
14
v.
4
no.
2005
139
150
https://isfj.areeo.ac.ir/article_113880_01aecb820bd2ae05e250f2a5ac9ab285.pdf
dx.doi.org/10.22092/isfj.2005.113880
Comparison of genetic variation of Ship sturgeon (Acipenser nudiventris) in the southern Caspian Sea and Ural River using PCR-RFLP
A.
Ghasemi
Rasth
author
M.
Porkazemi
Rasht
author
M.
Kalbasi
Noor
author
text
article
2005
per
Genetic variation of ship sturgeon (Acipenser nudiventris) from the Caspian Sea was investigated using NADH5/6 gene and PCR-RFLP analysis. A total of 80 specimens of the fish were collected from the south Caspian Sea and the Ural River from Kazakhstan. mtDNA ND5/6 gene was amplified by polymerase chain reaction (PCR) digested using 39 Endonucleases Restriction Enzyme. Of the 39 enzymes, five showed polymorphism. Totally, ten composite haplotypes among 80 specimens were detected. Haplotype AAAAA showed maximum frequency (57.5%) whereas haplotypes BBAAA and BABAA showed minimum frequency (1.2%). Haplotype AAAAB was recognized specifically in Ural River specimens. Average haplotype and nucleotide diversity was 0.8516 and 0.007 respectively. Compared to other sturgeon species living in the Caspian Sea, nucleotide diversity of Ship Sturgeon was much lower (0.007). This may be due to smaller population size of this species. Monte-Carol simulation using 1000 interaction did not show any sig.....
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
14
v.
4
no.
2005
151
164
https://isfj.areeo.ac.ir/article_113889_58ae9355f163499d8b1942686a51b3f8.pdf
dx.doi.org/10.22092/isfj.2005.113889
Determination of the best feeding ratio in Huso huso meat production cultured in fiber glass tanks
M.
Mohseni
Rasht
author
M.
Bahmani
Rasth
author
M.
Porkazemi
Rasht
author
H.
Porali
Rasht
author
A.
Arshad
Rasht
author
text
article
2005
per
A two-phase random growth test was conducted to evaluate the effects of feeding rate on growth performance, food conversion ratio (FCR), specific growth rate (SGR), feeding efficiency and price index of reared Huso huso fingerlings in fiberglass tanks (2x2x0.53 cm). Rearing conditions such as diet, dissolved oxygen, light, water flow, fish density and feeding frequency were kept similar for the tanks. In the first phase, 180 fingerlings with a mean weight 867.86±17.42g were fed for 100 days in four treatments and three replications at feeding rates 1, 2, 3 and 4 percent of their biomass. In the second phase, also four treatments and three replications were applied to 84 Huso huso with a mean weight 2096.1±35.6g. In this phase, the fish were fed for 125 days with 0.75, I .5, 2.5 and 3 percent of their biomass. During rearing period, water temperature was 25.52±1.78 and 14.82±0.48 degrees centigrade and dissolved oxygen was 7.6±0.3 and 7.89±0.18 mg/lit, for the two phases respectively. T.....
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
14
v.
4
no.
2005
165
180
https://isfj.areeo.ac.ir/article_113890_680df20594ae0ed4ef21f21aa028f83f.pdf
dx.doi.org/10.22092/isfj.2005.113890
An investigation on artificial reproduction of Mugil cephalus
A.
Mirhashemi rostami
Gorgan
author
K.
Amini
Gorgan
author
M.
Jorjani
Gorgan
author
H.
Gholi ghezel
Gorgan
author
A.
Shafeei
Gorgan
author
text
article
2005
per
Cultured nine years old breeder M. cephalus specimens were subjected to eight artificial breeding treatments from December till February 2003. In treatments 1-5, breeders received two injections of CPH and LIIRFI—A2 coupled with Domperidone or a mixture of CPH and HCG in an interval of 24 hours. Female breeders in treatments 6-8 received a gradual daily injection of 500 1U HCG per kilogram of body weight for 5 days. Male breeders in treatments 6-8 were given 5-10mg of MT-a-17 in addition to HCG and then subjected to two injections similar to that of treatments 1-5. Results showed that male breeders in stages +2 and +3 of all treatments that had received HCG produced more milt than those injected with MT-a-17, such that each male was used 2-6 times for milting purposes. Of 27 female breeders, 22 spawned 1-2.6 million eggs among which eight females' eggs were fertilized 10-95%. Hatching rate was between 0.008 to 88.9% and a maximum of 2 million larvae were produced. The best time for art.....
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
14
v.
4
no.
2005
181
196
https://isfj.areeo.ac.ir/article_113891_7cd3bbad31d8b77a0816e7d1548fbc20.pdf
dx.doi.org/10.22092/isfj.2005.113891
The effects of Glycerinate Hypophysis injection on the fluctuation of steroid hormones on Persian sturgeon (Acipenser persicus)
M.
Norozi
Tonekabon
author
Sh.
Oryan
tehran
author
M.
Bahmani
Rasht
author
text
article
2005
per
Using glycerin as a solvent of hypophysis powder for inducing ovulation in Acipencer persicus was studied at Shahid Beheshti Sturgeon Fish Reproduction Complex and Internatinal Sturgeon Research Institue. The experiment was done using four treatments in five replications. In treatment one, the female fish were injected with glycerin, whereas in treatment two, physiologic serum was used for injection. The females in treatment three were given two injections of glycerin, while those of the treatment four received two injections of physiologic serum. The evaluated factors in the blood serum included 17- 13 estradiol and 17-a hydroxy progesterone. The biometry factors were measured as well. The fish in treatment one showed higher frequency of fertilization, more concentration of estradiol and progesterone hormones compared to other treatments, although insignificantly. Treatment with one injection of physiologic serum caused the lowest amount of these factors. The fluidity of ovules in the.....
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
14
v.
4
no.
2005
197
214
https://isfj.areeo.ac.ir/article_113894_317ae67d511ff9965e898ece4fb05bd7.pdf
dx.doi.org/10.22092/isfj.2005.113894
Frequency distribution of Penaeus semisulcatus and Penaeus merguiensis in the catch of breeder shrimp trawlers in Jask and Sirik area, Oman Sea
Gh.
Zarshenas
tehran
author
Sh.
Ghasemi
tehran
author
text
article
2005
per
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
14
v.
4
no.
2005
215
222
https://isfj.areeo.ac.ir/article_113895_5f8baf9ba4f2e13bd41ce381fcd0d1f2.pdf
dx.doi.org/10.22092/isfj.2005.113895