نتایج جستجو برای: acipenser stellatus

تعداد نتایج: 1678  

چکیده در این پژوهش، یک آزمایش 12 هفته‌ای به‌منظور بررسی اثرات جایگزینی آرد ماهی با آرد ضایعات طیور (PBM) در جیره غذایی ماهیان ازون‌برون Acipenser stellatus بر شاخص‌های ایمنی و آنزیم‌های کبدی آن‌ها در اقلیم خوزستان، طراحی شد. پنج جیره غذایی (پلیت‌های غذایی با سطوح انرژی و پروتئین مشابه) محتوی سطوح مختلف آرد ضایعات طیور با نسبت‌های 0، 25، 50، 75 و 100 درصد طراحی شد. ماه...

2015
Jamilynn B. Poletto Dennis E. Cocherell Timothy D. Mussen Ali Ercan Hossein Bandeh M. Levent Kavvas Joseph J. Cech Nann A. Fangue

Diversion (i.e. extraction) of water from rivers and estuaries can potentially affect native wildlife populations if operation is not carefully managed. For example, open, unmodified water diversions can act as a source of injury or mortality to resident or migratory fishes from entrainment and impingement, and can cause habitat degradation and fragmentation. Fish-protection devices, such as ex...

Journal: :Environmental toxicology and chemistry 2012
R Christopher Chambers Dawn D Davis Ehren A Habeck Nirmal K Roy Isaac Wirgin

Exposure to chemical contaminants is often invoked to explain recruitment failures to populations of sturgeon worldwide, but there is little empirical evidence to support the idea that young sturgeon are sensitive at environmentally relevant concentrations. The authors used shortnose sturgeon (Acipenser brevirostum) and Atlantic sturgeon (Acipenser oxyrinchus) as models to investigate the sensi...

2017
Ya Liu Yeyu Chen Quan Gong Jiansheng Lai Jun Du Xiaochuan Deng

Acipenser dabryanus is listed as a Critical Endangered species in the IUCN Red List and the first class protected animals in China. Fortunately, A. dabryanus specimens are being successfully bred in captivity for conservation. However, for effective ex situ conservation, we should be aware of the genetic diversity and the degree of relatedness of the individuals selected for breeding. In this s...

Journal: :The Journal of parasitology 1979
E V Raikova V C Suppes G L Hoffman

No significant differences in macro- and micromorphology were found between the parasitic stolon and free-living polyps of Polypodium sp. obtained from infected eggs of the North American acipenseriform fish Polyodon spathula and corresponding developmental stages of Polypodium hydriforme Ussov, parasitic in the Volga sterlet (Acipenser ruthenus). Therefore, both the American and the European f...

Journal: :Genetics and molecular research : GMR 2015
S B Jin Y Zhang X L Dong Q K Xi D Song H T Fu D J Sun

Sturgeons (Acipenser schrenckii) are of high evolutionary, economic, and conservation value, and caviar isone of the most valuable animal food products in the world. The Illumina HiSeq2000 sequencing platform was used to construct testicular and ovarian transcriptomes to identify genes involved in reproduction and sex determination in A. schrenckii. A total of 122,381 and 114,527 unigenes were ...

2014
Hank L. Oppenheimer Keahi M. Bustamente Steven P. Perlman

Hibiscadelphus stellatus H. Oppenheimer, Bustamente, & Perlman, sp. nov., a new, narrowly endemic species from West Maui, Hawaiian Islands is described, illustrated and its affinities and conservation status are discussed. It is currently known from three populations totaling 99 plants in Kaua`ula valley on leeward western Maui. It differs from H. wilderianus, its nearest congener, in its dense...

2017
Gad Degani S. Yom Din Avshalom Hurvitz

In the present study, we examined the insulin-like growth factor receptor 1(IGF-1R) transcription using real-time PCR at different stages of oocytes of Russian sturgeon (Acipenser gueldenstaedtii) at age 8-9 years and weight 25 kg that were grown under aquaculture conditions. Compare to the pre-vitellogenesis stage, the transcription of IGF-1R increased at the vitellogenesis stages (yellow, gra...

Journal: :General and comparative endocrinology 2006
Karen Jackson Avshalom Hurvitz Svetlana Yom Din Doron Goldberg Oren Pearlson Gad Degani Berta Levavi-Sivan

Sturgeons are known throughout the world as the source of black caviar. Their declining populations in their native habitats, mainly the Caspian Sea, due to over-fishing for meat and caviar production, destruction of their spawning grounds and water pollution, have led to their introduction into aquaculture in areas with suitable conditions, including Israel. Recently, we noticed an unusual phe...

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