Experimenting on food formula for shrimp
H.
Azhdari
author
text
article
1998
per
Since the imported concentrated shrimp food is expensive and hard to provide, this project aimed to produce two types of shrimp food using the available raw in in the country. The ratio of protein, fat, hydrocarbons, fiber, ash and minerals in the produced food corresponded to the nutritional requirement of shrimp. Some 600 shrimps, which ware fed randomly with the shrimp food produced in the project and an imported concentrated food (CP) produced in Thailand, were studied closely. In each treatment beside the type of food, all other factors, i.e. salinity, temperature, pH, the capacity and color of the tanks, dissolved oxygen, how often the water was changed and quantity of the food ingested by the larva were the same. The obtained results based on the statistical analyses revealed that there was no significant difference between the food produced in this research and the control food (imported food) and accordingly these shrimp food can be utilized in shrimp culture......
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
7
v.
2
no.
1998
1
8
https://isfj.areeo.ac.ir/article_116016_10787d256e2288bb21a6b56ebad25799.pdf
dx.doi.org/10.22092/isfj.1998.116016
Phylogenic and systematic study on sturgeons
M.
Bahmani
author
text
article
1998
per
Sturgeons are anadromous and potamodromous species inhabiting the northern hemisphere, which have been existing for almost 100 million years. These species have been caught and processed by human for the past 2500 years. The native habitats of the genus Acipenser include Eastern America, Adriatic - Ponto - Caspian region, Amur River, the Pacific Ocean and Siberia. Some members of this genus, which belong to 120 and 240 Chromosome Group and lack the monophyletic structure inhabit the brackish waters of Adriatic - Ponto - Caspian region. However this region is considered to be the richest and most ancient habitat of the Acipenser genus. The seven sub-genera with common characteristics living in this region can be identified as follows: Subgenus 1- A. Sturio 2- A. Gladostomus 3- A. Sterleta 4- A. Antaceus 5- A. Sinosturio 6- A. Parasinosturio 7- A. Dinectus Beside morphological, biological and ecological knowledge, conducting physiological studies as well as field studie.....
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
7
v.
2
no.
1998
9
30
https://isfj.areeo.ac.ir/article_116322_2a285736a0d1e8301855d0b190c4c828.pdf
dx.doi.org/10.22092/isfj.1998.116322
Dichelyne minutus Rudolphi, 1819 (Nematoda : Cucullanidae) infection in Neogobius fluviatilis and Neogobius kessleri from southern part of Caspian Sea
text
article
1998
per
During a parasitological study on two Goby species, 15 Neogobius kesslerithe and 30 Neogobius fluviatilis caught in the South Caspian Sea and Tajan River (Mazandaran Province) respectively. The fish nematode Dichelyne minutus Rudalphi 1819 was isolated from 15 N kessleri and 2 N. fluviatilis. Both male and female specimen of this parasite, were observed in the intestine of 17 fishes, some of which had penetrated into the mucous membrane of the intestine. The infection rate in N. kessleri and N fluviatilis were 100% and 6.6% respectively......
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
7
v.
2
no.
1998
31
38
https://isfj.areeo.ac.ir/article_116323_583d215da3fb8c63343b6412cf7a9212.pdf
dx.doi.org/10.22092/isfj.1998.116323
Hybridization of Acipenser nudiventris X Acipenser stellatus and Comparing the hybrid species growth to the growth of Acipenser stellatus
M.
Rostamian
author
text
article
1998
per
In the present experiment, which was carried out for the first time in Iran, the crossbreeding of Acipenser nudiventris with Acipenser stellatus was subjected to a study. During the hybridization process, which was carried out using five brooders in one treatment, 633000 ova were obtained and the 174937 produced crossbred larva as well as 27648Acipenser stellatus larva, used as controls, were also studied. The results of this study revealed that the fertilization rate in the hybrid species was 79%, while it was very lower in the control species, only 30%. On the other hand the hatching rate in the hybrid species was only 6%, which was very lower than the hatching rate in the Acipenser stellatus. During the breeding process the hybrid fries grew and survived better than the Acipenser stellatus fries. The average daily growth of the hybrids was 55.22 mg, while the controls grew 34.62 mg daily. The morphometric study on the hybrid fries revealed that they resembled more Acipenser nudivent.....
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
7
v.
2
no.
1998
39
48
https://isfj.areeo.ac.ir/article_116324_8c44d683c1d4aaae1464194462c7c3bc.pdf
dx.doi.org/10.22092/isfj.1998.116324
Sex hormones changes in the reproductive cycle of female Trichiurus lepturus
Sh.
Oryan
author
K.
Parivar
author
A.
Yekrangian
author
H.
Hosseinzadeh
author
text
article
1998
per
Ribbon fish, family Trichiuridae, is one the most important protein resources of the Indian Ocean. The considerable density of these aquatic animals, especially the dominant species Trichiurus lepturus, has drawn many researchers' attention to its biological characteristics and its reproductive characteristics in particular. The sampling was carried out in the Oman Sea from March 95 to November 96 (n=778). Studies on Estradiol - 17 - β, Progesterone and Cortisol hormones in female Trichiurus lepturus indicated that the production of these hormones increases considerably from maturity stage II. The serum levels of Estradiol - 17 - β hormone peaked during September, October and November and it remained high in the other months (1500 pg/ml). High levels of Progesterone occurred from December to March (during the spawning season). The changes in the Cortisol levels from August to December and again from February to March (0.5 - 3.5 mic/100 ml) were significant. The Estradiol - 17 - β flu.....
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
7
v.
2
no.
1998
49
68
https://isfj.areeo.ac.ir/article_116325_9324cc67b953b3c9fc9298767ad6f74d.pdf
dx.doi.org/10.22092/isfj.1998.116325
The lethal effect of detergent on Microcyclops sp.
M.
Fallahi
author
M.
piri
author
text
article
1998
per
Microcyclops sp. was exposed to selected detergents (two dishwasher detergents, one washing-powder, one washing-machine powder and one shampoo) for 24 hours. The results indicated the dishwasher powder had higher lethal effect on Microcyclops sp. than the other examined detergents, especially one containing 17% Linear Alkyl Benzene Sulfonate, 5% Di-Ethanolamine and 2% Lauric Acid. The permissible concentration and the LC50 for the dishwasher powder is 7.84 and 13.32 mg/l respectively. Among the powders the washing-machine powder appeared to be least lethal (LC50 = 43.87 mg/l) and the shampoo with LC50 of 47.27 mg/l had the lowest lethal effect on Microcyclops sp.. Correlation rate of the detergent concentration logarithm and the mortality of Microcyclops sp. ranged between 94-98%......
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
7
v.
2
no.
1998
69
82
https://isfj.areeo.ac.ir/article_116326_892685ba51ea69bc2f3aea22540c3b6c.pdf
The Ichthyofauna of Anzali Lagoon
M.
Karimpor
author
text
article
1998
per
The present study on the Ichthyofauna of Anzali Lagoon carried out from 1992-94 revealed that 13 families, 36 genera and 42 species and sub-species of fish inhabit the lagoon and its connected rivers their whole life, part of it or immigrate to these waterbodies for reproduction purposes. The Cyprinidae family composes 59.5% of the lagoon's ichthyofauna (21 genera and 25 species and sub-species). Species such as Cyprinus carpio and Esox lucius are the native species of the Anzali Lagoon, while other species, e.g. Rutilus frisii kutum, immigrate to the lagoon from the Caspian Sea. Carassius auratus and Hemiculter leucisculus have been introduced to this aquatic ecosystem unintentionally together with Pseudorasbora parva. A number of the observed species in the Anzali Lagoon have been introduced to this aquatic ecosystem for certain reasons, i.e. cambating Anopheles mosquito Gambusia holbrooki, reducing the aquatic plant Ctenopharyngodon idella, increasing the stocks (Silver carp and Big.....
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
7
v.
2
no.
1998
83
94
https://isfj.areeo.ac.ir/article_116327_f84cc534b5a724826d34271cdd11a3ec.pdf
dx.doi.org/10.22092/isfj.1998.116327
The density and distribution of the dominant Phytoplankton in the southern Caspian Sea
A.
Ganjian
author
A.
Hosseini
author
A.
Keyhansani
author
M.
Khosravi
author
text
article
1998
per
The research project was comprised of four sampling cruises, which were carried out in summer 94; spring, autumn and winter 95 in the southern part of the Caspian Sea, where Chrysophyta (Diatoms) and Pyrrophyta were found to be the dominant phytoplankton. The maximum density of phylum Chrysophyta (Diatoms) was observed mainly during the autumn in the coast line (below 20 m) and in the central part of the southern Caspian Sea, while the highest density of phylum Pyrrophyta occurred during the spring in the subcoastal zone (below 50 m.). The dominant species in the phylum Chrysophyta (Diatoms) were Rhizosolenia calcar-avis, Thalossionema nitzschiodes, Sceletonema costatum, Cyclotella meneghiniane and three members of genus Coscinodiscus, among which R. calcar-avis had the highest density. Members of phylum Pyrrophyta, i.e. Exuvialla cordata, Prorocentrum scutellum and Glenodinium penardii had the highest density during the spring in the central part of the southern Caspian Sea, where.....
Iranian Scientific Fisheries Journal
Agricultural Research,Education and Extension Organization
1026-1354
7
v.
2
no.
1998
95
107
https://isfj.areeo.ac.ir/article_116328_389378cb397236592150958dd1b78f71.pdf
dx.doi.org/10.22092/isfj.1998.116328