Results 151 to 160 of about 1,015 (191)

Sturgeons (Pisces: Acipenseridae); threats and prospects

Journal of Fish Biology, 1990
Life histories of 24 species of sturgeons are briefly summarized and threats to their existence are reviewed. The most important of these are fishing and physical disturbance of rivers (barriers; fluctuating water levels; gravel extraction). Conservation measures to limit and compensate for these impacts are reviewed.
Mario Lepage, E Rochard
exaly   +3 more sources

The hypothalamo-hypophysial system in Acipenseridae

Cell and Tissue Research, 1976
The proximal neurosecretory contact region (PCR) of Acipenseridae, a homologue of the tetrapod median eminence, has been studied by light, fluorescence and electron microscopy. It occupies the rostral and chiefly the ventral surfaces of the hypothalamic tuber cinereum.
M A Belenky, M S Konstantinova, A L Polenov   +2 more
exaly   +3 more sources

Sturgeon. (Acipenseridae)

2018
Notes on the habitat and breeding attributes of ...
openaire   +2 more sources

Sturgeons-Acipenseridae

1954
exaly   +2 more sources

The Hypothalamo-Hypophyseal System in Acipenseridae

General and Comparative Endocrinology, 1997
Abstract The regeneration of the hypothalamo–hypophyseal system (HHS) has been studied in the sterlet following hypophysectomy (HypoX). Significant portions of non-apeptide and corticoliberinergic (CRH) neurosecretory cells (NSCs) underwent degeneration.
Andrey L Polenov, Valery V Kuzik, Olga A Danilova   +2 more
openaire   +1 more source

Lymphoid organs in sturgeons (Acipenseridae)

Veterinary Immunology and Immunopathology, 1986
Lymphoid (lymphomyeloid) tissues in sturgeons (hybrid sturgeon, Huso huso X Acipenser ruthenus, and white Pacific sturgeon, A. transmontanus) were investigated by dissection, histology and transmission electron microscopy. The main lymphomyeloid tissues are the thymus, the spleen, the anterior part of the kidney, the meningeal myeloid tissue, the ...
openaire   +2 more sources

Molecular Phylogeny of Acipenseridae: Nonmonophylyof Scaphirhynchinae

Copeia, 2002
Abstract A phylogenetic hypothesis is presented illustrating relationships among 23 extant sturgeon species based on nucleotide data from five mitochondrial genes (cytochrome b, NADH5, control region, 16S, and 12S). The tree supports our previous hypotheses regarding relationships among species of Acipenser and Huso.
Vadim J. Birstein, P. Doukakis, R. DeSalle   +2 more
openaire   +2 more sources

Sturgeon family (Acipenseridae)

2013
exaly   +2 more sources

Family acipenseridae — sturgeon

2007
exaly   +2 more sources

Evolution of the nucleolar apparatus during oogenesis in Acipenseridae

Development, 1976
ABSTRACTEvolution of the nucleoli has been followed during oogenesis in the Acipenserid fishes, Acipenser ruthenus (the sterlet) and A. güldenstädti (the sturgeon) using light and electron microscopes. In the ovaries of adults, the oogonial nuclei usually have a single nucleolus with an adjacent mass of paranucleolar fibrillar material.
openaire   +2 more sources