| تعداد نشریات | 282 |
| تعداد نشریات سازمان | 80 |
| تعداد شمارهها | 3,168 |
| تعداد مقالات | 35,197 |
| تعداد مشاهده مقاله | 50,943,405 |
| تعداد دریافت فایل اصل مقاله | 90,948,531 |
کنترل بیولوژیک علف های هرز آبزی بوسیله ماهی آمور در رودخانه کلوین اسکاتلند | ||
| مجله علمی شیلات ایران | ||
| مقاله 4، دوره 9، شماره 4، بهمن و اسفند 1379، صفحه 53-64 اصل مقاله (401.22 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/isfj.2001.115989 | ||
| نویسنده | ||
| یوسف فیلی زاده | ||
| چکیده | ||
| کنترل بیولوژیک، علف های هرز آبزی ،ماهی آمور | ||
| کلیدواژهها | ||
| کنترل بیولوژیک؛ علف های هرز آبزی؛ ماهی آمور | ||
| عنوان مقاله [English] | ||
| Biological Control of Aquatic Weeds by Grass Carp in Kelvin River (Scotland) | ||
| نویسندگان [English] | ||
| Y. Filizadeh | ||
| چکیده [English] | ||
| Biological control of aquatic weeds has raised much interest because of the sudden and often short-lasting effects of mechanical and chemical controls. The use of grass carp (Ctenopharyngodon idella) is mainly for the production of food and control of aquatic weeds. The aims of this study were to assess the degree and duration of weed control achieved at two stocking densities (150 and 250 kg ha-1 ) and to determine the change of fish size and their survival in Kelvin River. Analysis of variance showed that both stocking densities of grass carp caused a significant (p < 0.001) reduction of aquatic weeds. Results showed that free floating and submerged weeds by their soft tissues are often regarded as amongst the palatable species than emergent and floating-leaved species. Experimental results showed that about 60% fish survival with substatial weed reduction by the end of first year after releasing. Results showed that the average weight of grass carp in both 150 and 250 kg ha-1 at l, 2, and 3 years after releasing were 930, 1680, 2350, and 840, 1550, and 2200 grams respectively. Experimental results showed that weeds control by grass carp is temperature dependent and, to be effective, requires water temperature in excess of 16ᵒC for at least three months of the year. | ||
| کلیدواژهها [English] | ||
| biological control, aquatic weeds, Grass carp, survival | ||
| مراجع | ||
|
| ||
|
آمار تعداد مشاهده مقاله: 408 تعداد دریافت فایل اصل مقاله: 300 |
||