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Articles by M. Yousefian
Total Records ( 3 ) for M. Yousefian
  M. Yousefian and H. Mosavi
  The objective of this study was to study the status and the normative of reproduction of Caspian Kutum (Rutilus frisii kutum). The artificial reproduction in four rivers has investigated and the reproduction normative of this fish was compared. Based on the data of 2002, in total, about 30000 female and male have caught (ratio: 1 female to 2.4 male) and 4000 kg eggs have used for incubation in hatchery. The temperature in spawning time was in the range of 5-21°C but mostly 11°C, which is good for propagation. The number of dried eggs was 320 g-1. The fertilization rate is a good criterion for determination of eggs and sperm quality. The range of fertilization rate in four investigated river was 75 to 92% and it was significantly different (p<0.05). The hatchability in the rivers was very high but in those with high turbidity (colloid material) was low, due to damage the eggs during river incubation. The larvae reared in earthen pond riches of phytoplankton and zooplankton.
  M. Yousefian and A. Nejati
  In this study, inbreeding depression and abnormality effects on the basis of differences between inbred and outbred half-sib family groups of rainbow trout, Oncorhynchus mykiss are investigated. One generation of brother-sister mating, inbreeding depression in rainbow trout was calculated for three production traits, percentage egg hatchability, percentage survival of fry at active nutrition stage and weights at 150, 225 and 300 days. The inbreeding depression obtained for half-sib mating was 1.25 for percentage hatchability, 2.9 for percentage fry survival and up to 28.1, 35.2 and 35.6 for percent weight at 150, 225 and 300 days, respectively. Egg hatchability, fry survival and weight at early growth stage were not significant while a highly significant inbreeding depression was found for weight at 300 day (p<0). The difference between inbreeding depression for male and female half-sib group was non significant (p≥0.05). Although the inbreeding embryo had a noticeable though not significant negative effect on survival larval stage, it had a strong and significantly negative effect of growth rate at later stages of development. In the second series of experiments, the three traits showed the same pattern as the first one. Following one generation of full-sib mating, the calculated effect of inbreeding on the number of live fish and total weight of fish at 150 days of age showed a reduction of 5.83 to 8.49 weight percent in 2 groups. About 23% of larvae at hatching showed abnormal shapes of bighead, curved body, shortened tail and big abdomen, etc. There was frequently a type of axial deformations that were related to notochord alternations during embryogenesis. About 19% of abnormal larvae survived only upto feeding stage but 4% survived and reached juvenile and adults stage.
  M. Hedayatifard and M. Yousefian
  Golden mullet (Liza aurata) is one of the bony fish in the South basin of Caspian Sea and this work was conducted to study the fatty acids profiles with special emphasis on the omega-3 essential fatty acids in oils extracted from golden mullet fillet in fresh and salted condition. The fatty acids composition has been determined by gas-liquid chromatography. The results showed that unsaturated fatty acids were dominated in both fresh and salted tissues with 53.49 and 63.51%, respectively. Amounts of EPA and DHA in fresh tissue were 3.43 and 2.57% and in salted were 7.62 and 5.84%, respectively. Amount of total omega-3 fatty acids in the fresh and salted tissues were 6.62 and 14.57%, respectively. It was found that the amount of PUFA, especially EPA and DHA in the salted tissue had a higher amount than the fresh, while the lipid content is lower. These results were significant at a level of 95% (p<0.05). Golden mullet Liza aurata is a good source of PUFA and is one of the best sources of omega-3 essential fatty acids compared to some of freshwater fish of Caspian Sea.
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