fa بررسی تأثیر عصاره‌ی جلبک نوستوک (Nostoc sp.) بر شاخص‌های رشد تاس‌ماهی سیبری (Acipenser baerii, Brandt, 1869) تخصصي Special پژوهشي Research <span dir="RTL" lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" lotus="" style="font-family:">پژوهش حاضر به&shy;منظور بررسی اثر جلبک نوستوک بر شاخص‌های رشد تاس‌ماهی سیبری</span></span></span><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times=""> (<i>Acipenser baerii</i></span></span></span><b><i> </i></b><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">Brandt,&nbsp;</span></span></span><span style="font-size:11.0pt"><span style="line-height:115%"><span calibri="" style="font-family:"><a href="http://researcharchive.calacademy.org/research/ichthyology/catalog/getref.asp?id=618" style="color:blue; text-decoration:underline" target="_blank" title="Catalog of Fishes - References"><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">1869</span></span></span></a></span></span></span><i><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">)</span></span></span> &nbsp;</i><span dir="RTL" lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" lotus="" style="font-family:">انجام گرفت.</span></span></span> <span dir="RTL" lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" lotus="" style="font-family:">تعداد 72</span></span></span> <span dir="RTL" lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" lotus="" style="font-family:">&nbsp;قطعه بچه ماهی سیبری با میانگین وزنی 4 </span></span></span><span dir="RTL" lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span calibri="" style="font-family:">&plusmn;</span></span></span><span dir="RTL" lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" lotus="" style="font-family:"> 140گرم در 4 تیمار و هر تیمار با 3 تکرار شامل غذای شاهد (بدون عصاره جلبکی) تیمار یک با عصاره 5/0 درصد، تیمار دو با عصاره 1 درصد و تیمار سه 2 درصد عصاره‌ی جلبکی نوستوک به مدت42 روز تغذیه شدند</span></span></span><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">.</span></span></span><span dir="RTL" style="font-size:12.0pt"><span style="line-height:115%"><span b="" lotus="" style="font-family:"> زیست&shy;سنجی ماهیان به&shy;منظور بررسی شاخص&shy;های رشد در ابتدا، و آخر دوره آزمایش انجام گرفت. نتایج تجزیه و تحلیل داده&shy;ها در انتهای دوره نشان داد که شاخص‌های وضعیت بدن نرخ رشد ویژه (</span></span></span><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">SGR </span></span></span><span dir="RTL" style="font-size:12.0pt"><span style="line-height:115%"><span b="" lotus="" style="font-family:">&nbsp;) و </span></span></span><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">WG</span></span></span><span dir="RTL" lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" lotus="" style="font-family:"> در جلبک 2% </span></span></span><span dir="RTL" lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" lotus="" style="font-family:">&nbsp;بیشترین رشد و بیشترین افزایش وزن بدن را داشته و کمترین عملکرد مربوط به گروه شاهد بود. بالاترین ضریب تبدیل غذایی (</span></span></span><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">FCR</span></span></span><span dir="RTL" lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" lotus="" style="font-family:">) مربوط به گروه شاهد و کمترین آن در جلبک 2% &nbsp;مشاهده گردید؛ هم‌چنین، بیشترین مقدار ضریب چاقی (</span></span></span><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">CF</span></span></span><span dir="RTL" lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" lotus="" style="font-family:">) در جلبک5/0% و کمترین آن مربوط به جلبک 1% بود(05/0</span></span></span><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">P></span></span></span><span dir="RTL" lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" lotus="" style="font-family:">). </span></span></span><span dir="RTL" lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" lotus="" style="font-family:">با توجه به نتایج به‌دست آمده از تیمارهای مختلف، به‌نظر می‌رسد که استفاده از جلبک نوستوک با غلظت 2 درصد بهترین گزینه برای بهبود شاخص‌های رشد تاس‌ماهی سیبری</span></span></span> <span dir="RTL" lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" lotus="" style="font-family:">باشد. این تیمار نشان‌دهنده بیشترین رشد و افزایش وزن بدن نسبت به سایر تیمارها بود. هم‌چنین، به‌نظر می‌رسد تیمار 5/0 درصد جلبک نوستوک بیشترین ضریب چاقی</span></span></span><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times=""> (CF) </span></span></span><span dir="RTL" lang="AR-SA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" lotus="" style="font-family:">را ارائه داده است؛ اما از لحاظ افزایش وزن و رشد کلی، تیمار 2 درصد برتری دارد. </span></span></span> <span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:Calibri,sans-serif"><span style="background:white"><span new="" roman="" style="font-family:" times=""><span style="color:black">The aim of the present study was to investigate the effects of Nostoc algae on the growth indices of Siberian sturgeon (Acipenser baerii). A total of 72 juvenile Siberian sturgeon with an average weight of 140 &plusmn; 4 grams were allocated to four treatment groups, each with three replicates. The treatments included a control diet (without algae extract), treatment one with 0.5% extract, treatment two with 1% extract and treatment three with 2% extract of Nostoc algae. The fish were fed over a period of 42 days. Biometric measurements were taken both at the beginning and at the end of the experimental period to evaluate the growth indices. Data analysis at the end of the experiment revealed that specific growth rate (SGR) and weight gain (WG) were highest in the 2% algae treatment, while the control group had the lowest performance. The highest feed conversion ratio (FCR) was achieved in the control group, while the lowest FCR was observed in the 2% algae group. </span></span></span><span style="font-size:12.0pt"><span style="background:white"><span style="line-height:107%"><span new="" roman="" style="font-family:" times=""><span style="color:black">The best condition factor (CF) was recorded with the 0.5% algae treatment, while the lowest CF was associated with the 1% algae treatment (P < 0.05). Overall, these results indicate that the addition of Nostoc algae at different percentages significantly improved the growth indices of Siberian sturgeon. Based on the research results and the knowledge gained from the different treatments, the use of nostoc algae at a concentration of 2% seems to be the best option to improve the growth indices of Siberian sturgeon (Acipenser baerii). This treatment showed the highest growth and body weight gain compared to the other treatments. In addition, the treatment with 0.5% nostock algae seems to provide the highest condition factor (CF). However, in terms of weight gain and overall growth, the 2% treatment shows clear superiority.</span></span></span></span></span><span style="background:white"><span style="font-family:"Times New Roman",serif"></span></span></span></span></span><br> &nbsp; شاخص‌‌های رشد , جلبک نوستوک, تاس ماهی سیبری, تغذیه growth indices, Nostoc sp., Siberian sturgeon, nutrition 31 40 http://jair.gonbad.ac.ir/browse.php?a_code=A-10-117-2&slc_lang=fa&sid=1 Anita Golpour آنیتا گلپور anita.golpour@gmail.com 10031947532846009567 10031947532846009567 Yes Seyed Abbas Hosseini سید عباس حسینی seyedabbas_hosseini@yahoo.com 10031947532846009568 10031947532846009568 No Seyed Ali Akbar Hedayati سید علی اکبر هدایتی marinebiology1@gmail.com 10031947532846009569 10031947532846009569 No Moazameh Kordjazi معظمه کردجزی kordjazi.m@gmail.com 10031947532846009570 10031947532846009570 No Hamid Mohammadi Azarm حمید محمدی آذرم azarmhamid@gmail.com 10031947532846009571 10031947532846009571 No Fatemeh Abbasi فاطمه عباسی F.abbasi59@yahoo.com 10031947532846009572 10031947532846009572 No