2024-03-28T18:15:23+03:30 http://jifro.ir/browse.php?mag_id=48&slc_lang=en&sid=1
48-3192 2024-03-28 10.1002
Iranian Journal of Fisheries Sciences IJFS 1562-2916 10.18869/acadpub.ijfs 1999 1 2 A prelimenary study on fecundity of fresh water crayfish (Astacus leptodactylus) in Arass water reservior, I.R. Iran N. Hosseinpour M. Karimpour A research study was conducted to investigate the number of ovarian eggs and estimate potential egg production of A. leptodactylus. In this study, mean number ovarian eggs 420.41±42.51 with the average total length to 121.93±4.27 mm (n=58). The mean pleopodal eggs were 322.04±29.61 with average total length of 119.14±3.94 mm (n=67). Comparison of the fecundity rate in different population of A. leptodactylus in different areas revealed that the Arass crayfish has a greater fecundity rate than others. The discrepancy between ovarian eggs and pleopodal eggs were 21% in Arass reservoir. Crayfish Astacus leptodactylus Fecundity Monitoring programms 1999 7 01 1 9 http://jifro.ir/article-1-3192-en.pdf
48-3193 2024-03-28 10.1002
Iranian Journal of Fisheries Sciences IJFS 1562-2916 10.18869/acadpub.ijfs 1999 1 2 Effect of chemical herbicides and insecticides on mortality and feeding of silver carp (Hypophthalmichthys molitrix) M. Piri V. Ördog Fingerlings of Silver Carp (Hypophthalmichthys molitrix) were used in an ecotoxicological investigation. The fish were exposed to (0.3-10 mg/l) Machete, (3-5 mg/l) Saturn, (1.5-13 mg/l) Diazinon and (1-10 mg/l) Malathion to measure the toxicity effect of these chemicals on mortality, feeding and ingestion rate. Methods for investigation on mortality were according to TRC (1984) and feeding behavior, according to Gould Equation (1951). Porbit analysis was used for evaluation of obtained data. LC10 of these toxic compounds were 0.17-0.23, 2.85-3.73, 0.6-0.95, 0.87-1.34 mg/l for Machete, Saurn, Diazinon and Malathion respectively. Experiments showed that Machete and Diazinon in comparison with Saturn and Malathion were highly toxic for fingerlings of silver carp. At first fish showed to be disturbed, then moved rapidly and exhausted. A secretion of excess mucus was also noticed and eye-ball became expanded. There was also blanching of the skin. The fish surfaced sometimes on their side and became unbalanced which resulted in death. Abnormal behavior of fish became greater with the increase of pesticides concentration. In these exposures pH was decreased, in contrast with the amount of water hardness. LC10, LC50 and LC90 form 24 to 96 hours were mostly decreased. Feeding experiments showed that 8 hours exposure below the LC50 values reduced 50 percent of feeding and ingestion rates. Herbicide Insecticide Silver carp Feeding Mortality 1999 7 01 11 21 http://jifro.ir/article-1-3193-en.pdf
48-3194 2024-03-28 10.1002
Iranian Journal of Fisheries Sciences IJFS 1562-2916 10.18869/acadpub.ijfs 1999 1 2 Distribution and biomass of macrobenthic fauna in the Chabahar Bay (North Eastern Sea of Oman) N. Nikouyan A. Saravi Population density, distribution and biomass of macrobenthic fauna in Chabahar Bay were investigated from May 1995 to March 1996 on a bimonthly basis. The most abundant groups were Amphipods (21%), Polychaetes (19%), Gastropods (15.7%) and Bivalves (10.6%). Maximum (13000 individuals/m2) and minimum (4600 individuals/m2) were observed in May and July respectively. The changes in density were influenced by monsoon season of the Indian Ocean. Spatial and temporal variations in biomass were recorded for all groups separately. The lowest biomass was observed during monsoon period (July-September) with a mean of 51.5 g dry wt/m2 and the highest in permonsoon period (March-May) with an average of 164.8 g dry wt/m2. The results are discussed in terms of understanding secondary production of Chabahar Bay.  Macrofauna Distribution Biomass Monsoon Chabahar Bay 1999 7 01 23 39 http://jifro.ir/article-1-3194-en.pdf
48-3195 2024-03-28 10.1002
Iranian Journal of Fisheries Sciences IJFS 1562-2916 10.18869/acadpub.ijfs 1999 1 2 New records of trematode parasites (digenea) in the banded frog (Rana camerani) and marsh frog (Rana ridibunda ridibunda) (Anura: Ranidae), from southwest of Iran N. Masahaii Fourteen adult frogs including six banded frog, Rana camerani and eight marsh frog, Rana ridibunda ridibunda were collected from two sites of Chahar Mahal-o-Bakhtiari province at the southwest of Iran and then were examined for helminth parasites. Only Dolichosaccus rastellus  (50%) was found in R. camerani, Skrjabinoeces similis (50%) and metacercarian cysts of Codonocephalus urniger (12.5%) were found in R. ridibunda ridibunda. This is both the first report of Dolichosaccus rastellus in R. camerani as a new host for this parasite, and of Codonocephalus urniger in Iranian frogs; also a first report of Skrijabinoeces similis in south west of Iran. Trematode Parasite Digenea Frog Iran 1999 7 01 41 48 http://jifro.ir/article-1-3195-en.pdf
48-3196 2024-03-28 10.1002
Iranian Journal of Fisheries Sciences IJFS 1562-2916 10.18869/acadpub.ijfs 1999 1 2 An investigation on the micropyle number in the ova of the strugeon species in Caspian Sea A. Hallajiyan M. Pourkazemi M. Kalbasi K. Amini The micropyle number in the ova of sturgeon species from the South Caspian Sea was investigated. The study was conducted on female broodfishes of three species of sturgeon (Persian sturgeon Acipenser persicus, Stetates sturgeon A. stellatus and great sturgeon Huso huso) included 44 Persian sturgeon, 13 stellate sturgeon and 8 great sturgeon specimens. Fifty eggs were randomly collected from each broodfish and the micropyle number of totally 3250 eggs was determined. Out of 44 Persian sturgeon used, 14 specimens were collected from the south-east Caspian region (Golestan Province, Shaid Marjani Center) and 30 were from the south-west Caspian region (Guilan Province, Shahid Dr. Beheshti Center). The stellate sturgeon specimens were taken from the south-west and the great sturgeon specimens from the south-east Caspian region. The obtained result showed that the mean micropyle number in Persian sturgeon caught from the south-east Caspian region was 8 whereas in those caught from the south-west region was 9. There was no significant difference (p>0.95) in the micropyle number of Persian sturgeon collected from the south-east and south-west regions. The mean micropyle number determined for stellate and great sturgeon was 5. The outer diameter of the micropyle in the Persian, stellate, and great sturgeon were 22 μm, 17 μm and 19 μm respectively. Micropyle Oocyte Sturgeons South Caspian Sea 1999 7 01 49 59 http://jifro.ir/article-1-3196-en.pdf
48-3197 2024-03-28 10.1002
Iranian Journal of Fisheries Sciences IJFS 1562-2916 10.18869/acadpub.ijfs 1999 1 2 Comparative study of biochemical and hematological features in reared sturgeons M. Bahmani R. Kazemi P. Donskaya Suitable physiological condition in fishes for the selection of broodfishes can be achieved through hematological studies. The present study aimed to examin the hematological indices in Juvenile Sturgeons at different stages of growth. Total albumin content in blood serum, hemoglobin concentration, the erythrocyte and leukocyte count of 54 sturgeon specimens (Persian sturgeon Acipenser persicus and Great sturgeon Huso huso) were determined at the age of 1, 2 and 6 years reared fish. In the Persian sturgeon specimens studied, total albumin concentration increased from 26.1 to 52.5 gL-1, hemoglobin from 42.2 to 65.8 gL-1, erythrocyte count from 240 to 452.5 thousand cells/ μL-1, and leukocyte count from 17.4 to 46.7 thousand cells/ μL-1. The total leukocyte was composed of 73.2-82.7% lymphocytes, 12.3 to 20% neutrophils, 2.2 to 6.5% eosinophils and 0.2 to 2.5% monocytes with the increase of age.  In the great sturgeon specimens studied, total albumin concentrations in blood increased from 20 to 42.4 g L-1, hemoglobin from 46.3 to 78.6 g L-1, and erythrocyte count from 495 to 735 thousand cells μL-1. The total leukocyte was composed of 54.5 to 67.5% lymphocytes, 6.1 to 26.9 % neutrophils, 6.6 to 13.25% eosinophils and 0.6 to 2.5% monocytes with the increase of age. This research revealed the evolutionary trends of hematological features in the natural growth and development of sturgeons in the South Caspian Sea, reared in artificial conditions and shows that with the increase in age, the hematological indices also increased.    Biochemical Hematological Juvenile sturgeon Rearing condition 1999 7 01 61 73 http://jifro.ir/article-1-3197-en.pdf