نتایج جستجو برای: acipenseriformes

تعداد نتایج: 54  

Journal: :FEBS letters 2010
Dengqiang Wang Lei Zhong Qiwei Wei Xiaoni Gan Shunping He

Here we present the first isolation of major histocompatibility complex (MHC) class I genes from two ancient fish, paddlefish (Polyodon spathula) and Chinese sturgeon (Acipenser sinensis). Seventeen sequences obtained showed high polymorphism and positive natural selection with dN/dS>1. Evolutionary relationships revealed that sequences from paddlefish and Chinese sturgeon distinguished from ot...

Journal: :Journal of fish biology 2012
P S Forsythe K T Scribner J A Crossman A Ragavendran E A Baker C Davis K K Smith

The associations were quantified between daily and interannual variation in the timing of a closed population of lake sturgeon Acipenser fulvescens migration and arrival at spawning sites with stream environmental and lunar covariates. Spawning data were gathered from 1262 fish in Black Lake, Michigan 2001 to 2008 and by video monitoring 2000 to 2002. Sex-specific variation in responses to exte...

Journal: :Journal of fish biology 2013
J T Patterson S D Mims R A Wright

This study quantified the effects of temperature and fish mass on routine metabolism of the American paddlefish Polyodon spathula. Thermal sensitivity, as measured by Q(10) value, was low in P. spathula. Mean Q(10) was 1·78 while poikilotherms are generally expected to have Q(10) values in the 2·00-2·50 range. Mass-specific metabolism did not decrease with increased fish size to the extent that...

Journal: :Molecular biology and evolution 2002
Jeannette Krieger Paul A Fuerst

A test of the hypothesis that the members of the order Acipenseriformes (sturgeons and paddlefishes) possess a slowed rate of molecular evolution was carried out by conducting relative-rate comparisons with representatives of four groups of teleost fishes (Cypriniformes, Elopomorpha, Salmonidae, and Percomorpha) using 21 nuclear or mitochondrial protein loci and the nuclear and mitochondrial sm...

Journal: :Journal of morphology 2004
Marcus C Davis Neil H Shubin Allan Force

The pectoral fins of Acipenseriformes possess endoskeletons with elements homologous to both the fin radials of teleosts and the limb bones of tetrapods. Here we present a study of pectoral fin development in the North American paddlefish, Polyodon spathula, and the white sturgeon, Acipenser transmontanus, which reveals that aspects of both teleost and tetrapod endoskeletal patterning mechanism...

Journal: :iranian journal of ichthyology 0
mohammad reza noei institute of zoology, the azerbaijan national academy of sciences, baku, azerbaijan. shaig ibrahimov institute of zoology, the azerbaijan national academy of sciences, baku, azerbaijan. masoud sattari department of fisheries, faculty of natural resources, guilan university, somaeh sara campus, guilan, iran.

although the persian sturgeon, acipenser persicus , is a commercially valuable sturgeon species of the caspian sea, but there are only few reports about its parasite fauna in the southern part of the caspian sea. in this study, a total of 209 individuals of persian sturgeon were collected from two regions in the southwestern of caspian sea (guilan province, iran) from march 2009 to may 2011. af...

Journal: :Journal of morphology 2003
Andrew M Carroll Peter C Wainwright

Acipenseriformes (sturgeon and paddlefish) are basal actinopterygians with a highly derived cranial morphology that is characterized by an anatomical independence of the jaws from the neurocranium. We examined the morphological and kinematic basis of prey capture in the Acipenseriform fish Scaphirhynchus albus, the pallid sturgeon. Feeding pallid sturgeon were filmed in lateral and ventral view...

2015
Robert E. Colombo Paul S. Wills James E. Garvey ROBERT E. COLOMBO PAUL S. WILLS JAMES E. GARVEY

—During November 2002, 51 shovelnose sturgeon Scaphirhynchus platorynchus were sexed by ultrasound imaging using a portable ultrasonograph. We identified males with 96% accuracy (N 5 25) and females with 80% accuracy (N 5 25); one hermaphroditic individual was misidentified as a male. Overall, ultrasound imaging was 86% accurate. Sex in postspawned females was difficult to determine, 60% being ...

2005

BACKGROUND: Paddlefish and sturgeons (Acipenseriformes) collectively constitute one of the most imperiled groups of fishes in North America. Populations were over-exploited for meat and caviar in the early 20th century (Tower 1908, Stockard 1908, Saffron 2002) and are impacted today by continued harvesting, habitat degradation, and habitat loss (Williamson 2003). Some instances of entrainment h...

2011
Andreea Dudu Radu Suciu Marian Paraschiv Sergiu Emil Georgescu Marieta Costache Patrick Berrebi

Acipenseriformes are composed of 25 sturgeon species and two paddlefish species distributed exclusively in the northern hemisphere. The Danube River and the Black Sea were originally inhabited by six sturgeon species but two are extinct and only four are still reproducing currently in the Lower Danube: Huso huso, Acipenser stellatus, A. gueldenstaedtii and A. ruthenus. Sturgeon species hybridiz...

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