نتایج جستجو برای: a gueldenstaedtii
تعداد نتایج: 13431844 فیلتر نتایج به سال:
The Russian sturgeon (Acipenser gueldenstaedtii) species is in high demand owing to its valuable caviar. Therefore, it danger of extinction. Since the reaches sexual maturity late life cycle, this has a economic cost for farmers. However, can be reduced with an environmentally friendly system called biofloc technology. This study compared growth performance and health indicators groups using di...
Abstract Sturgeon populations are declining worldwide and the target of extensive conservation efforts. Addressed in several pieces legislation, sturgeons have received considerable attention as flagship or umbrella species. Despite need for a better understanding distribution population status, use traditional sampling methods failed past, thereby hampering reliable assessments, prerequisite c...
تاسماهی روسی با نام علمی (Brandt & Ratzeberg, 1833) Acipenser gueldenstaedtii یکی از با ارزشترین ماهیان شیلاتی در سواحل دریای خزر بوده و بیشتر در سواحل شمالی دیده میشود. پژوهش فوق به بررسی و مطالعه تعداد میکروپیل در تخمکهای مولدین تاسماهی روسی پرداخته است. در این تحقیق از 5 عدد مولد تاسماهی روسی که از صیدگاههای سواحل جنوبغربی دریای خزر در استان گیلان صید شده بودند...
Aim. The aim of this study was to conduct an analysis long‐term changes in the number sturgeon populations and its relationship with fishing regime current state Ural River basin, as well develop measures for conservation restoration their resources. Discussion. Six species inhabit waters basin: Huso huso Linnaeus, 1758; Acipenser gueldenstaedtii Brandt & Ratzeburg, 1833; persicus Borodin, ...
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