Journal of Aquaculture Development

fa رشد و بازماندگی بچه ماهیان اوزون‌برون (Acipenser stellatus) در شوری‌های مختلف آب دریای خزر Growth and survival rate of Acipenser stellatus fish in different salinities of the Caspian Sea تخصصي Special پژوهشي Research       بچهماهیان ازونبرون در اوزان مختلف (10- 5/0 گرم) در چهار تیمار از شوریهای 5/0-0 (تیمار شاهد)، 4-5/0 (تیمار 1)، 9- 4 (تیمار 2) و 13-9 (تیمار 3) قسمت در هزار و هر تیمار در سه تکرار مورد آزمایش قرارگرفتند. آزمایش در مدت زمانی یک ماه به همراه غذادهی با غذای زنده ترجیحاً دافنی، گاماروس، کرم نرئیس دریایی در حد اشباع و 6 وعده در روز انجام شد. در طی دوره، تلفات روزانه جمعآوری و ثبت گردید. نتایج نشان داد که درصد بازماندگی در تیمار شاهد و تیمار 1 به طور معنیداری بیش از تیمار 2 و تیمار 3 در محدوه وزنی 1 – 5/0 گرم بود (05/0>p)، همچنین درصد بازماندگی در تیمار شاهد و تیمار 1 به طور معنی‌داری بیشتر از تیمار 3 در محدوه وزنی 3 – 1 گرم بود (05/0>p). درصد بازماندگی در تیمار شاهد و تیمار 1 به طور معنیداری بیشتر از تیمار 2 و تیمار 3 برای وزن 5 – 3 گرم بود (05/0>p). درصد بازماندگی در محدوه وزنی 10 – 5 گرم در تیمارهای مختلف اختلاف معنیداری نشان نداد (05/0<p). با توجه نتایج حاصل، پیشنهاد میگردد بچهماهیان ازونبرون ابتدا در مصب رودخانه در شوری زیر 8 گرم در لیتر رهاسازی شده و پس از سازگاری به شوری، وارد دریا شوند.    Due to the drought and water shortage of rivers in the southern basin of the Caspian Sea, especially during the release of these fish and illegal fishing of juveniles in the river, to increase the survival rate, it is better to release these fish in the river or directly into the sea. Acipenser stellatus were examined in different weights with four treatments of 0.5-0, 0.5-0, 4-9 and 9-13 salinity per thousand (ppt) and each treatment in three replications. The experiment was performed for a period of one month along with feeding with live food, preferably Daphne, Gamarus, Nereis worm with a saturation of 6 servings per day and siphon and water change. Daily losses were collected and recorded during the period. The results showed that the percentage of survival in salinities of 0.5-0 and 4-5 g / l was significantly higher than salinity of 4-9 and 9-13 g / l in the weight range of 0.5-1 g. It was 0 g (df = 3, F = 68.800, P = 0.000). Also, the percentage of survival in salinities of 0.5-0 and 4-9 g / l was significantly higher than the salinity of 13-9 g / l in the weight range of 1-3 g (df = 3, F = 7.558, P = 0.010). Survival percentage in salinities of 0.5-0 and 0.5-4 g / l was significantly higher than salinity levels of 4-9 and 13-9 g / l for weight of 3-5 g (df = 3, F = 8.933 P = 0.006). Survival percentage in different salinities in the weight range of 5-10 g showed a significant difference (df = 3, F = 68.800, P = 0.000). According to the results, it is suggested that juvenile Acipenser stellatus are first released in the estuary at salinity below weight range of 8 g / l and enter to the sea after adapting to salinity.Due to the drought and water shortage of rivers in the southern basin of the Caspian Sea, especially during the release of these fish and illegal fishing of juveniles in the river, to increase the survival rate, it is better to release these fish in the river or directly into the sea. Acipenser stellatus were examined in different weights with four treatments of 0.5-0, 0.5-0, 4-9 and 9-13 salinity per thousand (ppt) and each treatment in three replications. The experiment was performed for a period of one month along with feeding with live food, preferably Daphne, Gamarus, Nereis worm with a saturation of 6 servings per day and siphon and water change. Daily losses were collected and recorded during the period. The results showed that the percentage of survival in salinities of 0.5-0 and 4-5 g / l was significantly higher than salinity of 4-9 and 9-13 g / l in the weight range of 0.5-1 g. It was 0 g (df = 3, F = 68.800, P = 0.000). Also, the percentage of survival in salinities of 0.5-0 and 4-9 g / l was significantly higher than the salinity of 13-9 g / l in the weight range of 1-3 g (df = 3, F = 7.558, P = 0.010). Survival percentage in salinities of 0.5-0 and 0.5-4 g / l was significantly higher than salinity levels of 4-9 and 13-9 g / l for weight of 3-5 g (df = 3, F = 8.933 P = 0.006). Survival percentage in different salinities in the weight range of 5-10 g showed a significant difference (df = 3, F = 68.800, P = 0.000). According to the results, it is suggested that juvenile Acipenser stellatus are first released in the estuary at salinity below weight range of 8 g / l and enter to the sea after adapting to salinity.Due to the drought and water shortage of rivers in the southern basin of the Caspian Sea, especially during the release of these fish and illegal fishing of juveniles in the river, to increase the survival rate, it is better to release these fish in the river or directly into the sea. Acipenser stellatus were examined in different weights with four treatments of 0.5-0, 0.5-0, 4-9 and 9-13 salinity per thousand (ppt) and each treatment in three replications. The experiment was performed for a period of one month along with feeding with live food, preferably Daphne, Gamarus, Nereis worm with a saturation of 6 servings per day and siphon and water change. Daily losses were collected and recorded during the period. The results showed that the percentage of survival in salinities of 0.5-0 and 4-5 g / l was significantly higher than salinity of 4-9 and 9-13 g / l in the weight range of 0.5-1 g. It was 0 g (df = 3, F = 68.800, P = 0.000). Also, the percentage of survival in salinities of 0.5-0 and 4-9 g / l was significantly higher than the salinity of 13-9 g / l in the weight range of 1-3 g (df = 3, F = 7.558, P = 0.010). Survival percentage in salinities of 0.5-0 and 0.5-4 g / l was significantly higher than salinity levels of 4-9 and 13-9 g / l for weight of 3-5 g (df = 3, F = 8.933 P = 0.006). Survival percentage in different salinities in the weight range of 5-10 g showed a significant difference (df = 3, F = 68.800, P = 0.000). According to the results, it is suggested that juvenile Acipenser stellatus are first released in the estuary at salinity below weight range of 8 g / l and enter to the sea after adapting to salinity.v رشد, بازماندگی, بچه ماهی, ازون‌برون (Acipenser stellatus), شوری, دریای خزر. Growth, Survival rate, Juveniles, Acipenser stellatus, Salinity, Caspian Sea 15 26 http://aqudev.lahijan.iau.ir/browse.php?a_code=A-10-583-1&slc_lang=fa&sid=1 Esmail Hosseinnia اسماعیل حسین نیا esmaeilhosseinnia@yahoo.com 10031947532846009198 10031947532846009198 Yes International Sturgeon Research Institute انستیتو تحقیقات بین المللی ماهیان خاویاری Ayoub Yousefi Jourdehi ایوب یوسفی ayoub2222002@yahoo.com 10031947532846009199 10031947532846009199 No International Sturgeon Research Institute انستیتو تحقیقات بین المللی ماهیان خاویاری Zabihollah Pajand ذبیح ا... پژند Zpajand@yahoo.com 10031947532846009200 10031947532846009200 No International Sturgeon Research Institute انستیتو تحقیقات بین المللی ماهیان خاویاری Alireza Ashouri علیرضا عاشوری alireza.ashouri52@gmail.com 10031947532846009201 10031947532846009201 No International Sturgeon Research Institute انستیتو تحقیقات بین المللی ماهیان خاویاری Reza Ghorbani Vaghei رضا قربانی واقعی Ghorbani_V2@yahoo.com 10031947532846009202 10031947532846009202 No International Sturgeon Research Institute انستیتو تحقیقات بین المللی ماهیان خاویاری Hooshang Yeganeh Rastekenari هوشنگ یگانه راسته کناری hooshang.yegane@yahoo.com 10031947532846009203 10031947532846009203 No International Sturgeon Research Institute انستیتو تحقیقات بین المللی ماهیان خاویاری