Results 71 to 80 of about 5,116 (246)

Tensile Properties of 3D‐Printed Porous Bouligand Structured Polymer Plates

Macromolecular Materials and Engineering, Volume 311, Issue 4, April 2026.
The tensile performance of porous Bouligand‐structured polymers is governed by pitch angle and fiber spacing. Experimental and FEA results reveal optimal strength and stiffness at 30∘$^\circ$, with mechanical efficiency scaling with density. These tunable bioinspired architectures bridge cellular solids and composites, offering lightweight, damage ...
Praveenkumar Subhash Patil, Edward D. McCarthy, Parvez Alam   +2 more
wiley   +1 more source

Unprotected Waters: When Protection Fails In Freshwater

Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 36, Issue 3, March 2026.
ABSTRACT Invasive species are a major driver of biodiversity loss in protected areas (PAs), yet their impacts in aquatic environments are less well documented. This study investigated the occurrence and distribution of nonnative freshwater fish in federal PAs in Brazil.
Aymar Orlandi Neto, Éder André Gubiani, Igor Paiva Ramos   +2 more
wiley   +1 more source

Endoscopy application in broodstock management of Arapaima gigas (Schinz, 1822) [PDF]

Journal of Applied Ichthyology, 2016
First paragraph: The air-breather fish Arapaima gigas (Schinz, 1822) is an emblematic species of the Amazon with adults reaching up to 2.5 m total length. A. gigas is long-considered a promising new candidate species for aquaculture, with reported growth rates of 10 kg over 1 year, no intramuscular spines, and suitability to different production systems.
Torati, Lucas S, Varges, Ana Paula S, Galvao, Jose A S, Mesquita, Pedro E C, Migaud, Herve   +4 more
openaire   +2 more sources

Fine‐Scale Genomic Divergence in the Amazonian Pirarucu (Arapaima gigas) Highlights the Need for Local Management Strategies

Freshwater Biology, Volume 71, Issue 3, March 2026.
ABSTRACT Freshwater habitats face significant human disturbances globally, impacting food security and ecosystems. Protected areas can mitigate biodiversity loss, but limited data on population connectivity hinders conservation management. This study examines pirarucu (Arapaima gigas), a heavily exploited and threatened Amazonian fish, using genomic ...
Julia Tovar Verba, Ricardo J. Pereira, João V. Campos‐Silva, Izeni P. Farias, Tomas Hrbek, Carlos A. Peres, Joseph E. Hawes   +6 more
wiley   +1 more source

Feeding of juvenile pirarucu (Arapaima gigas, Arapaimidae) in their natural environment, lago Quatro Bocas, Araguaiana-MT, Brazil

Neotropical Ichthyology
The stomach content of samples of juvenile Arapaima gigas was analized to obtain information about feeding in natural environments. This species occurs in the Amazonian basin, predominantly in floodplain environment. This is the case of the valley of the
Valdézio de Oliveira, Stephania Luz Poleto, Paulo Cesar Venere   +2 more
doaj   +1 more source

Efeito da densidade de estocagem na homogeneidade do crescimento de juvenis de pirarucu em ambiente confinado. [PDF]

, 2019
O objetivo deste trabalho foi avaliar o efeito da densidade de estocagem sobre a homogeneidade do crescimento de juvenis de pirarucu (Arapaima gigas) em tanques-rede de pequeno volume.
CAVERO, B. A. S., CRESCENCIO, R., GANDRA, A. L., ITUASSÚ, D. R., PEREIRA-FILHO, M., ROUBACH, R.   +5 more
core  

Arapaima gigas stocks have declined drastically in the lower Tocantins River in the Amazon Microregion [PDF]

Anais da Academia Brasileira de Ciências
Arapaima gigas, an emblematic species of the Amazon region and a longstanding primary fishing resource, currently holds a “Data Deficient” status on the International Union for Conservation of Nature Red List, and is listed as an endangered species in ...
DARALYNS B. MACEDO, JEANDERSON S. VIANA, HENDRYA JULIANNY P. COELHO, CAIO VITOR C. COSTA, DÁRCIA GABRIELA B. DA COSTA, ÁDRIA D. DOS SANTOS, REGIANNE M.S. CORREA, ROMMEL THIAGO J. RAMOS, MARÍLIA DANYELLE N. RODRIGUES   +8 more
doaj   +1 more source

Perspectivas da produção comercial do pirarucu. [PDF]

, 2019
Diversos grupos de pesquisa de vários países da Bacia Amazônica vêm desenvolvendo pesquisas com o pirarucu, Arapaima gigas, devido principalmente a seu crescimento rápido e a grande demanda por sua carne.
CRESCÊNCIO, R.
core  

Nitrogen excretion and oxygen consumption under severe hypoxia in siluriform fishes from the Amazon

Journal of Fish Biology, Volume 108, Issue 3, Page 881-893, March 2026.
Abstract Siluriform fishes collected from the Rio Negro and Rio Solimões proved to be highly resistant to aquatic hypoxia. In all four species analysed in this study, aquatic oxygen consumption significantly decreased from normoxic levels at water PO2 values near 1 kPa. Air‐breathing activity was observed only in Sturisoma sp. (Rio Negro).
Bernd Pelster, Chris M. Wood, Adalberto Luis Val   +2 more
wiley   +1 more source

Arapaima gigas f. cf.

Arapaima cf. gigas f. cf. Distribution Amazonia. Notes Barriga (1994), WCS (2007), Jácome-Negrete (2013).
Escobar-Camacho, Daniel, Valdiviezo-Rivera, Jonathan, Carrillo-Moreno, Carolina, Argüello, Pablo, Swing, Kelly   +4 more
openaire   +1 more source