Results 61 to 70 of about 3,168 (183)
Population structure of fishes from an urban stream
Acta Scientiarum: Biological Sciences, 2017 The aim of this study was to identify the population structure of the ichthyofauna in an urban stream within an environmental protection area in southern Brazil. Quarterly samplings were conducted between October 2009 and August 2010.
Naiara Zanatta +4 more
doaj +1 more source
Ethology, Volume 132, Issue 4, Page 295-304, April 2026.Environmental contamination with the synthetic estrogen 17α‐ethinyl estradiol (EE2) is widespread in coastal ecosystems, yet behavioural effects in marine fishes remain poorly understood. We exposed southern crested weedfish (Cristiceps australis) to low and high EE2 concentrations for 14 days and assessed boldness and anxiety using a refuge‐use assay.
Shiho Ozeki +6 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 +2 more
wiley +1 more source
Optomotor test for wavelength sensitivity in guppyfish (Poecilia reticulata)
Vision Research, 1998 Wavelength sensitivity was measured in the guppyfish by means of optomotor responses to a special apparent-motion display. A set of red and green bars appeared to humans to move to the left if red was darker than green, but to the right if red was lighter than green. At equiluminance there was no apparent motion.
Anstis, Stuart +2 more
openaire +2 more sources
Male Strategic Association With Mating Partners Under Varying Social Contexts in a Livebearing Fish
Ecology and Evolution, Volume 16, Issue 3, March 2026.We found that in halfbeaks, a shoaling fish species, males preferentially associated with an opposite sex pair (i.e., a female and a male) over rival males, but showed no preference when choosing between a pair and females. Overall, our data show that males followed informed association strategies that are primarily driven by mating opportunities ...
Arezo Shamsgovara +5 more
wiley +1 more source
Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, Volume 345, Issue 2, Page 148-161, March 2026.ABSTRACT In fish, sex determination and gonadal development are controlled by various genetic and environmental factors. In this study, experiments were conducted on the estuarine mummichog (Fundulus heteroclitus) to investigate gonadal differentiation following exposure to the synthetic estrogen, 17α‐ethinylestradiol (EE2).
Ibrahim Chehade +5 more
wiley +1 more source
Ethology, Volume 132, Issue 3, Page 216-224, March 2026.This study investigated the behavioral response of common minnows (Phoxinus phoxinus) to repeated exposures of the sample phase of an object location task, and the influence of individual behavioral type on cognitive performance. The group exposed to the most sample trials were the only group that learned the task showing significant discrimination ...
Cairsty DePasquale +3 more
wiley +1 more source
DNA Barcoding: A Study of Guppy Fish (Poecilia reticulata) in East Java, Indonesia
Biosaintifika: Journal of Biology & Biology Education, 2019 Poecilia reticulata is a freshwater fish from the northeastern part of South America and spread widely to various countries in Asia and other continents. However, research about P.
Sucipto Hariyanto +3 more
doaj +1 more source
Journal of Eukaryotic Microbiology, Volume 73, Issue 2, March/April 2026.ABSTRACT A scuticociliate most closely related to Philaster apodigitiformis caused mass mortalities of diadematoid sea urchins and was cultured as Philaster sp. isolate FWC2. We sequenced the metagenomic content of this isolate, which was predicted to represent ≤ 56% of the complete genome.
Shen Jean Lim, Mya Breitbart
wiley +1 more source
Revista de la Facultad de Ciencias Agropecuarias, 2015 El trabajo se realizó en la Estación Piscícola de la Granja Santo Domingo de la Universidad de la Amazonia, ubicada a 7km de la Ciudad de Florencia, teniendo como objetivo evaluar la sustitución de concentrado comercial por Guppy(Poecilia reticulata ...
H. E. Ocaña, S. M. Cruz, D. M. Parra
doaj