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Articles by A. Matinfar
Total Records ( 4 ) for A. Matinfar
  F. Askarian , A. Matinfar , A. Kousha , M. Bahmani , K. Khorshidi , A. Shenavar and E. Ringo
  The composition of lactic acid bacteria (LAB) in intestine of two species of sturgeon, beluga (Huso huso) and Persian sturgeon (Acipenser persicus), was analyzed. LAB in the gastrointestinal (GI) tract of the two sturgeon species was not similar as LAB population levels in beluga was significantly higher than Persian sturgeon. Six strains of lactic acid bacteria isolated from the GI tract of beluga and Persian sturgeon were characterised by 16S rDNA. Two species of LAB including Enterococcus seriolicida and Leuconostoc mesenteroides were isolated from GI tract of Persian sturgeon and the predominant species was L. mesenteroide. Furthermore, Lactobacillus curvatus, Lactococcus raffinolactis, Lactococcus lactis and Streptococcus sp. were isolated from the GI tract of beluga and the counts of L. curvatus was significantly higher in the GI tract of beluga than other species.
  M. Bahrekazemi , A. Matinfar , M. Soltani , B. Abtahi , I. Pusti and A. Mohagheghi
  The effects of egg retention time in the abdominal cavity after ovulation on egg viability were studied in Caspian brown trout (Salmo trutta caspius). Eggs were retained in the parental abdominal cavity for 40 days post ovulation. Partial volumes of eggs stripped from 10 individually identified females and fertilized with fresh semen obtained from 8 males at 10 days intervals for 4 stages. The biochemistry of the eggs and ovarian fluid were studied to investigate possible links with post-ovulatory oocyte aging. The eyeing and hatching rate of the eggs declined with over-ripening time: that is, the expected amounts (90.60±6.28% for eyeing and 86.33±6.82% for hatching) in newly ovulated eggs (0-10 days post ovulation) decreased to 0.67±1.34% and 0.49±0.98%, respectively, in over-ripened eggs (30-40 days post ovulation). However, larval abnormalities remained constant for 30 days after ovulation. Over the course of post-ovulation oocyte aging, the pH of the ovarian fluid significantly decreased and the concentration of glucose, protein, calcium, iron and aspartate aminotransferase activity significantly increased. Moreover, the concentration of protein, triglycerides and aspartate aminotransferase activity in the eggs also changed. The present study demonstrated that the best time to take Caspian brown trout eggs after ovulation at 7±0.6°C was up to 10 days post ovulation. Also, egg viability was related to both ovarian fluid parameters (e.g., pH, protein, aspartate aminotransferase, glucose, cholesterol, triglycerides, iron, calcium) and egg parameters (e.g., cholesterol, triglycerides, iron, aspartate aminotransferase) which can be used to detect egg quality defects associated with oocyte post-ovulatory aging.
  F. Mohammadizadeh , T. Valinassab , S. Jamili , A. Matinfar , A.H. Bahri-Shabanipour and M. Mohammadizadeh
  The present study investigated feeding habits and diet composition of Sawtooth barracuda (Sphyraena putnamae) by regular monthly collection throughout 13 months from November 2006 to November 2007 in the Northern Persian Gulf. Sawtooth barracuda is considered as one of the valuable fishes in the Persian Gulf. The 486 specimens of Sphyraena putnamae were examined. The highest and the lowest observed Fork length and body weight was 10.6 and 93.0 cm and 8.03 and 40.0 g, respectively. The fork length-weight relationships was W = 0.0071 FL2.9295 (R2 = 0.99). Studies have showed that this fish, having the Relative Length of Gut RLG = 0.34±0.002, is strongly carnivorous (meat-eater, often fish-eater), proven by the fact that more than 98% of its stomach contents are fish. The CV = 0.47% indicates the middle alimentary of this fish. Index of condition factor (Kf), increasing in March and decreasing in June. Gastro-Somatic Index (GaSI), indicating the highest level in the month of January and July and lowest level in June and October. The Fullness Index (FI) increases in March before spawning and decreases in June and September during spawning.
  S. Abdolbaghian , S. Jamili and A. Matinfar
  There are several factors affecting Angel Fish fry’s (Pterophllum scalare) growth and quality. In this study, the effect of food treatments including dry blood worm, Artemia decapsulated cysts and dry blood worm together with Artemia decapsulated cyst in three temperature conditions i.e., 27, 29 and 31°C on specific growth rate and weight growth of angel fish fry (Pterophllum scalare) has been studied. For each food diet three repetitions took place. Thus, 27 aquariums with 30, 40 and 60 dimensions were allocated to the treatments. An observant treatment with 28°C and pollaki as the food was also used. The degrees of these indexes (SGR and WG) were examined in a 6 month experiment. Meanwhile, the other factors including the pH and the oxygen degree were fixed and similar for all treatments. The results showed that the temperature and food type are simultaneously effective on specific growth rate and weight growth of the fish. Among all food and temperature treatments and the observant treatment, the degree of SGR and WG for the fish was believe to be more in the food treatment with 31°C and powdered dry blood worm. This result confirms that temperature and food diet simultaneously affect the Angel Fish fry’s SGR and WG.
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