استفاده از کائولینت جهت کنترل شکوفایی سیانوباکتریایی جدا شده از استخرهای مزارع پرورش ماهیان گرمابی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموختة دکتری تخصصی، گروه شیلات، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران

2 دانشیار موسسة تحقیقات خاک و آب کشور، سازمان تحقیقات آموزش و ترویج کشاورزی، کرج، ایران

10.22059/jfisheries.2024.363889.1400

چکیده

پدیدة­ شکوفایی سیانوباکتریایی از جمله، آلودگی ­های مزمن و دوره ­ایست که بیشترً ناشی از فسفر و نیتروژن و نیز در دماهای بالا و تابش نور مستقیم خورشید رخ می ­دهد. برای انجام این آزمایش، جهت دستیابی به سیانوباکتری ­های شکوفا کننده در استخر پرورش ماهیان گرمابی از آب 5 مزرعه نمونه­ برداری شد و پس از خالص ­سازی، کشت انبوه 4 گونة سیانوباکتری دارای بیشترین تراکم، تهیه گردید. سپس کائولینت با غلظت 0/5 گرم بر لیتر و به‌صورت مجزا با دو اندازة 100 و 50 میکرومتر به کشت خالص هر گونة سیانوباکتر در یک ستون یک متری اضافه شد و میزان کاهش سیانوباکتری­ ها با شمارش به‌وسیلة لام نئوبار در زمان های 0، 3، 9 و 24 ساعت پس از افزودن به آن بررسی گردید. نتایج نشان داد میزان کاهش تعداد سیانوباکتری­ Chroococcus sp. برای کائولینت با دو اندازة 100 و 50 میکرومتر به‌ترتیب 4/24 و 39 درصد بود. این عدد برای سیانوباکتری Gloeocapsa sp.، 25/8 و 15/5 و برای سیانوباکتر Oscillatoria sp.، 23/5 و 35/3و در نهایت برای سیانوباکتر Microcystis sp.، 29/4 و 33/3 درصد محاسبه شد (0/05<P). نتایج این پژوهش نشان داد استفاده مجزا از دو اندازة 100 و 50 میکرومتر کائولینت جهت کنترل فوری شکوفایی سیانوباکتریایی مؤثر است و کائولینت با اندازة 50 میکرومتر عملکرد بهتری دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Using kaolin to control the Cyanobacterial bloom isolated from warm water fish ponds

نویسندگان [English]

  • Mostafa Alishiri Junaghani 1
  • Alireza Fallah Nosratabad 2
1 PhD graduate, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran
2 Associate Professor, Soil and Water Research Institute, Agricultural Education and Promotion Research Organization, Karaj, Iran
چکیده [English]

The phenomenon of cyanobacterial bloom, among other things, is chronic and periodic pollution, which is mainly caused by phosphorus and nitrogen, as well as high temperatures and direct sunlight. To carry out this experiment, in order to obtain blooming cyanobacteria in the warm water pond fish, water samples were taken from 5 farms and after purification, mass culture of 4 species of cyanobacteria that had the highest density was prepared. Then kaolin with a concentration of 0.5 g/liter and separately with two sizes of 50 and 100 micrometers was added to the pure culture of any cyanobacteria species using a 1-meter column. The amount of reduction of cyanobacteria was checked by counting by Neubauer chamber at 0, 3, 9 and 24 hours after adding to it. The results showed the decrease in the number of cyanobacteria Chroococcus sp. For kaolin with two sizes of 100 and 50 micrometers, it was 24.4 and 39%, respectively. This rate was 25.8 and 15.5% for the cyanobacterium Gloeocapsa sp. Also, for cyanobacterium Oscillatoria sp., 23.5 and 35.3% were calculated and finally for cyanobacterium Microcystis sp., 29.4 and 33.3% were calculated. The results of this research showed that the separate use of two sizes of kaolin, 100 and 50 micrometers, is effective for the immediate control of cyanobacterial bloom, and also, comparing the two sizes of kaolin, kaolinite with the size of 50 micrometers had better operation.

کلیدواژه‌ها [English]

  • Kaolin
  • Cyanobacteria
  • Chemical control
  • Blue-green algae
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