نوع مقاله : مقاله پژوهشی
1 گروه شیلات، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه سرا، گیلان
2 موسسه تحقیقات بین المللی تاسماهیان دریای خزر، سازمان تحقیقات، آموزش و ترویج کشاورزی، رشت، ایران
عنوان مقاله [English]
This study was designed to investigate the effects of different levels of betaine including zero (control), 0.5, 1 and 2% on growth performance and carcass chemical composition of Stellate sturgeon (Acipenser stellatus) fingerlings. Experiment was performed with 4 treatments with 3 replications. One hundred and eighty Stellate sturgeon fingerlings with an average weight of 32 ± 4 g )± standard deviation( were randomly fed in 12 fiberglass tanks (500 L capacity) for 60 days. Fish were hand-fed based on appetite 3 times per day. Diets were used in this experiment contained different levels of betaine concentration 0 (control), 0.5, 1 and 2%. The results showed that there was no significant difference between different treatments on weight gain, specific growth rate, condition factor and feed conversion ratio )p>0.05(, but different levels of betaine resulted significant differenc on body compositions (p < 0.05). The body protein in 2% betaine showed significant increase in comparsion with control. The body lipid in 2% betaine showed significant decrease in comparsion with control and treatment that was fed with 0.5% betaine. The body moisture in 2% betaine and treatment that was fed with 1% betaine showed decrease in comparsion with control treatment. There was no significant difference in body ash in different treatments. The present study reveals that the use of betaine, although not having a significant positive effect on growth performance, but would improve the carcass chemical composition in the Stellate sturgeon.