p. 1−9
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0.05). Survival rate in the main treatments IES30/4, vitamin C (20%) and 24 h enrichment period were 100%±1.00, 99%±1.00, 99%±1.00 respectively which caused the highest salinity tolerance in fish larvae. Also, omega 3 and omega 6 fatty acids in all Artemia nauplii and sturgeon fish larvae treatment especially those enriched with the commercial emulsion increased significantly compared to control groups (P<0.05). ]]>
p. 11−21
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p. 23−30
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0.05). Fillet fatty acid composition was analyzed and the results showed that fillet fatty acid composition was highly affected by dietary fatty acid profile and the highest accumulation rate of linoleic acid (C18:2n6) and linolenic acid (C18:3n3) was observed in 100% soybean and fish oil respectively. Also feeding 50% soybean oil stimulated elongation and desaturation pathway of C18 PUFA in fingerlings and the highest amount of EPA, DHA arachidonic acid (AA) was observed in this treatment. Data obtained show that replacing fish oil with 100% soybean oil had inhibitory effect on the elongation and desaturation of C18 PUFA and the lowest amount of DHA and AA obtained in fingerlings fillet. ]]>
p. 31−41
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p. 43−50
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p. 51−75
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p. 59−69
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p. 71−78
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5 ng/ml). In females, T, E2 and 17-OHP levels were relatively low before vitellogenesis, but during the vitellogenesis (stage IV) the level of T and E2 dramatically increased. The level of 17α-hydroxyprogestrone showed chaotic fluctuations in different stages. In conclusion, T, E2 and 17-OHP hormones are most important indices of sexual maturation. ]]>
p. 79−86
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0.05). It is also found that calcium chloride had positive effect on extra-oral taste reception in all 3 weight groups. In other words, the index of extra-oral palatability increased by increasing concentration. The maximum levels of index of intra-oral palatability for calcium chloride were observed at concentrations of 1% (for small group) and 10% (for medium and large group). But sucrose had negative effect on number of catching acts, just for large group, and it had also negative effect on consumption of granules for all 3 weight groups. Based on these results, we can say addition of 0.5-1 % calcium chloride in juveniles of Persian sturgeon diet can improve feeding status in this species. ]]>
p. 87−96
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p. 97−104
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0.05). ]]>
p. 105−111
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p. 113−120
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p. 121−133
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0.05). ]]>
p. 135−141
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p. 143−147
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