نتایج جستجو برای: great beluga
تعداد نتایج: 225601 فیلتر نتایج به سال:
Background and purpose: High concentrations of heavy metals have always been a major cause of contamination in aquatic ecosystem. Sturgeons are important sources of food and income throughout the world. In this study, concentrations of Cadmium, Vanadium, Nickel and Zinc (Cd, Ni, V and Zn) were examined in edible and inedible tissues of stellate sturgeon (Acipenser stellatus) and beluga (Huso hu...
Aerial surveys of belugas, or white whales, Delphinapterus leucas, were conducted off West Greenland in March 1993 and 1994. These surveys were designed to permit comparisons with similar surveys in 1981, 1982, and 1991. Differences in methods between the surveys in the early 1980s and those in the 1990s should mean that the 1990s surveys were, if anything, more efficient than the 1980s surveys...
BACKGROUND: Hematological studies are valuable diagnostictechniques in the medical care of fish, reflecting the healthcondition and the effects of environmental factors on fish. OBJECTIVES:Due to the high value of sturgeon fish and necessityto recover the brood stock, this study was done to provide dataabout hematological parameters and reproduction normative ofwild brood stock beluga, Huso hus...
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