Results 11 to 20 of about 104,038 (234)

Homeology of sex chromosomes in Amazonian Harttia armored catfishes supports the X-fission hypothesis for the X1X2Y sex chromosome system origin

open access: yesScientific Reports, 2023
The Neotropical monophyletic catfish genus Harttia represents an excellent model to study karyotype and sex chromosome evolution in teleosts. Its species split into three phylogenetic clades distributed along the Brazilian territory and they differ ...
Francisco de Menezes Cavalcante Sassi   +9 more
doaj   +1 more source

A case of intersex occurrence in Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae) under captivity condition: A cytogenetic and morphological study [PDF]

open access: yes, 2016
Poco se sabe sobre la biología reproductiva de Steindachneridion parahybae , una especie de teleósteo gonocorístico en peligro de extinción que habita la cuenca del río Paraíba do Sul y en éste trabajo se describe por primera vez la aparición de ...
Caneppele, Danilo   +4 more
core   +2 more sources

Microsatellite loci in the tiger shark and cross-species amplification using pyrosequencing technology [PDF]

open access: yesPeerJ, 2016
The tiger shark (Galeocerdo cuvier) has a global distribution in tropical and warm temperate seas, and it is caught in numerous fisheries worldwide, mainly as bycatch.
Natália J. Mendes   +10 more
doaj   +2 more sources

“Um peixe é um peixe”, ou a escada de Tolstói

open access: yesRUS (São Paulo), 2021
Este artigo debruça-se sobre a versão dos evangelhos de Tolstói, explorando os seus procedimentos interpretativos e metodológicos. Visa mostrar que esta obra singular procede em larga medida das experiências pedagógicas de Tolstói nas décadas de 1860-70 e que nela se jogam muitas das questões que iriam mais tarde surgir na filosofia de Wittgenstein.
openaire   +5 more sources

Integrating Cytogenetics and Population Genomics: Allopatry and Neo-Sex Chromosomes May Have Shaped the Genetic Divergence in the Erythrinus erythrinus Species Complex (Teleostei, Characiformes)

open access: yesBiology, 2022
Diversity found in Neotropical freshwater fish is remarkable. It can even hinder a proper delimitation of many species, with the wolf fish Erythrinus erythrinus (Teleostei, Characiformes) being a notable example.
Fernando H. S. de Souza   +7 more
doaj   +1 more source

THE IMPORTANCE OF FREE STRETCHES IN A DAMMED RIVER TO THE MAINTENANCE OF Schizodon intermedius POPULATIONS

open access: yesBoletim do Instituto de Pesca, 2019
This paper focuses on to evaluate the importance of a free stretches upstream of a Neotropical reservoir for the maintenance of Schizodon intermedius populations, a medium size migratory species and important fisheries resources.
Felipe Pontieri de Lima   +5 more
doaj   +1 more source

Revealing the Satellite DNA History in Psalidodon and Astyanax Characid Fish by Comparative Satellitomics

open access: yesFrontiers in Genetics, 2022
Eukaryotic genomes are usually enriched in repetitive DNA sequences, which can be classified as dispersed or tandemly repeated elements. Satellite DNAs are noncoding monomeric sequences organized in a head-to-tail fashion that are generally located on ...
Caio Augusto Gomes Goes   +8 more
doaj   +1 more source

USING STOCK ASSESSMENT TO INVESTIGATE THE SUSTAINABLE FISHERIES OF THE YELLOW MANDI Pimelodus maculatus IN THE UPPER URUGUAY RIVER, SOUTHERN BRAZIL

open access: yesBoletim do Instituto de Pesca, 2020
The yellow mandi Pimelodus maculatus is a medium-sized species with a wide geographical distribution. The species is very common in the Neotropical region, representing an important share of fishing activity in several Brazilian reservoirs.
Gianfrancisco Schork   +4 more
doaj   +1 more source

Investigating an Unknown Biodiversity: Evidence of Distinct Lineages of the Endemic Chola Guitarfish Pseudobatos percellens Walbaum, 1792 in the Western Atlantic Ocean

open access: yesDiversity, 2023
Anthropogenic actions have affected marine species for a long time, through overexploitation of natural stocks and habitat degradation, influencing the life strategies of several taxa, especially rays and sharks, which have suffered significant ...
Vanessa P. Cruz   +8 more
doaj   +1 more source

Peix pesant?

open access: yesEducació Química : EduQ, 2008
Estudi de la concentració de diversos metalls pensants (cadmi, coure, plom, zinc i níquel) en dos aliments d'origen marí (salmó i musclos) mitjançant la tècnica d'espectrofotometria d'absorció atòmica i fem una comparació dels resultats amb els límits establerts en la normativa vigent.
Riera Palomino, Adrià   +1 more
openaire   +2 more sources

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