نتایج جستجو برای: salmo trutta caspius
تعداد نتایج: 4871 فیلتر نتایج به سال:
Water space, tritiated water flux, drinking and urine flow rates of the brown trout were decreased by increasing the environmental calcium concentration. Diffusional and osmotic permeabilities were identical in fresh water. This suggests that water flow across the gill occurs entirely by diffusion. Previous suggestions of a discrepancy between the two permeabilities in freshwater teleosts could...
Prevalence and intensity of Gyrodactylus colemanensis and G. salmonis (Monogenea) parasitizing juvenile/adult brook trout Salvelinus fontinalis, rainbow trout Oncorhynchus mykiss, brown trout Salmo trutta, and Atlantic salmon Salmo salar at 3 localities over an 8 km stretch in the South River, Nova Scotia, Canada, were calculated 4 times over a 9 mo period (October 2009, December 2009, March 20...
نونیل فنول ماده شبه استروژنی است که قادر به ایجاد اختلال در سیستم درون ریز موجودات زنده میباشد. هدف از مطالعه حاضر بررسی اثرات نونیل فنول بر تعادل هورمونی و همچنین اثرات هیستوپاتولوژیک آن در ماهی آزاد نابالغ دریای خزر (salmo trutta caspius) بود. بدین منظور، بچه ماهیان با وزن 10±40 گرم به مدت 21 روز در معرض غلظتهای 1، 10 و 100 میکروگرم بر لیتر نونیل فنول قرار داده شدند و سپس آسیبهای بافتی در باف...
Genetic variation for phenotypic plasticity is ubiquitous and important. However, the scale of such variation including the relative variability present in reaction norms among different hierarchies of biological organization (e.g., individuals, populations, and closely related species) is unknown. Complicating interpretation is a trade-off in environmental scale. As plasticity can only be infe...
In external fertilizer fish, ovarian fluid (OF) seems to play a key role in fertilization success, improving spermatozoa swimming performance. These OF/sperm interaction mechanisms are frequently species-specific and/or population-specific and could decrease the risk of genetic introgression wild populations from introduced or escaped zootechnical individuals. The Mediterranean brown trout (Sal...
استفاده از چربیها بعنوان غذای مکمل در جهت افزایش رشد و مقاومت در برابر تنشها در آزاد ماهیان مؤید اثرات مثبت آنهاست. در این بررسی تاثیر دو سطح مختلف روغنهای گیاهی بر ساختار سکومهای گوارشی بچه ماهیان آزاد دریای خزر (Salmo trutta caspius) در مقایسه با غذای تجاری مورد بررسی قرار گرفت. بدین منظور 270 بچه ماهی پس از رقمبندی با میانگین وزنی 10 گرم انتخاب و 90 عدد برای هر تیمار و 30 عدد برای هر تک...
In brown trout, red and white skeletal muscle express the insulin-regulatable glucose transporter 4 (btGLUT4). We have previously shown that the mRNA expression of btGLUT4 in red muscle, but not white muscle, is altered under experimental conditions designed to cause changes in the plasma levels of insulin, such as fasting, insulin and arginine administration. In order to determine whether chan...
The biological and anthropogenic (management) factors that may contribute to the expansion of non-native lineages in managed fish have been studied in this work taking brown trout (Salmo trutta) as a model species. The changes of users' opinion about stocking was studied employing social science methodology (surveys). The evolution of hatchery stocks together with the outcome of stocking were a...
Endocrine effects in the aquatic environment are in the focus of scientists and media along with debates on the necessity of further steps in wastewater treatment. In the present study VTG responses were compared to evaluate upgrades at wastewater treatment plants (WWTPs). We investigated several advanced sewage treatment technologies at two WWTPs connected to the Schussen, a tributary of Lake ...
Invertebrates living in streams where predatory fish are present are often able to detect them through waterborne chemical cues and respond with behavioural changes that lower predation risk. We hypothesised that behavioural responses to a predatory fish (brown trout, Salmo trutta) would be stronger in grazing mayflies (Baetis sp. and Epeorus sp.) than in detritivorous caddisflies (Potamophylax...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید