p. 1−11
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p. 12−22
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p. 23−31
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0.05). The highest polarization index (PI) (10.6 ± 2.6) in broodstocks belonged to the groups caught in beach seine and minimum PI values (6.6 ± 0.9) were observed in broodstocks caught in the river (P<0.05). Highest fertilization rate (92.2 ± 3.3 %) belonged to broodstocks caught in the river which was significantly higher than broodstocks collected from the sea (75.1 ± 4.8 %) (P<0.05). It is evident from the results obtained that higher values for reproduction indices were recorded in broodstocks caught in the river. Therefore, it is suggested that in order to improve artificial breeding programs in hatcheries and also to increase fertilization rate and survival rates of eggs and larvae, more attempts should be made to facilitate the migration of these spawners into the Sefidroud.
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p. 32−43
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p. 44−52
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0.05). The final whole body moisture content decreased significantly with increasing energy levels in diets (P<0.05). Although whole body lipid and protein contents did not show significant variation among treatments (P>0.05), but the highest lipid and protein deposition were observed in diets containing 3.5 and 3kcal/g DE, respectively. Comparison between varying levels of dietary energy on the growth, feed utilization and whole body composition of Gattan indicated that 3 kcal g-1 DE could be the preferential dietary energy levels in fingerlings of this species.
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p. 53−64
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p. 65−77
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0.05). Light intensity and photoperiod did not significantly affect survival of juvenile shrimp (P>0.05). Our study suggest that light intensity of 50 lx provide conditions for better growth rate and photoperiod could be adjusted to 12 or 24 h light.]]>
p. 78−86
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p. 87−96
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0.05), but mahi sefid fingerlings fed by Immunoster containing diet showed slightly better growth function. Survival rate didn’t have significant difference between treatments. The amount of red blood cells (R.B.Cs) and the amount of white blood cells (W.B.Cs) in one cubic millimeter of blood showed significant difference between control and fingerlings fed with 2 and 4 percents levels of Immunoster (P ≤ 0.01). As 2 percent level of Immunoster had highest of R.B.Cs and W.B.Cs in compare with control group. Also there were significant difference between control and experimental groups the view of protein, fiber and carbohydrate of carcass (P ≤ 0.05).
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p. 97−109
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