Results 111 to 120 of about 839,133 (225)
New univariate characterization of fish community size structure improves precision beyond the Large Fish Indicator [PDF]
arXiv, 2017 The size structure of fish-communities is an emergent high-level property of marine food webs responsive to changes in structure and function. To measure this food web property using data arising from routine fisheries surveys, a simple metric known as Typical Length has been proposed as more suitable than the Large Fish Indicator, which has been ...
arxiv
, 2020 Background. The European grayling, Thymallus thymallus (Linnaeus, 1758), is a fish species of high value in recreational fishing. The monitoring of changes in grayling populations is a high priority in fisheries.
Roman Lyach, J. Remr
semanticscholar +1 more source
Genetical adaptation of common kilka Clupeonella cultriventris (Nordmann, 1840) (Actinopterygii: Clupeidae) [PDF]
arXiv, 2013 It is the first time, when genetic diversity and the common kilka population structure were investigated throughout the areal. Data about the species condition at the Upper Volga basins were updated accordingly to modern condition. Physiological and ecological adaptations to northern water basins were evaluated. Significance of interaction between some
arxiv
Counting Fish and Dolphins in Sonar Images Using Deep Learning [PDF]
arXiv, 2020 Deep learning provides the opportunity to improve upon conflicting reports considering the relationship between the Amazon river's fish and dolphin abundance and reduced canopy cover as a result of deforestation. Current methods of fish and dolphin abundance estimates are performed by on-site sampling using visual and capture/release strategies.
arxiv
Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 35, Issue 5, May 2025.ABSTRACT This study indicates a seasonal aggregation behaviour in Blacktip (Carcharhinus limbatus) and Spinner (C. brevipinna) sharks over 6 years of data in Ilha Grande Bay, a warm temperate bay in Rio de Janeiro, Brazil. Observations from visual surveys, drone footage and Baited Remote Underwater Video (BRUV) deployments revealed mixed‐species ...
Fernanda Andreoli Rolim +6 more
wiley +1 more source
, 2020 We report an interaction between Octopus insularis (Octopoda, Octopodidae) and the reef fish Alphestes afer (Perciformes, Epinephelidae) and provide evidence of mimicry, camouflage and following behaviors.
Antônio Felinto +2 more
semanticscholar +1 more source
Frontiers in Immunology, 2019 The immune system is composed of two subsystems—the innate immune system and the adaptive immune system. The innate immune system is the first to respond to pathogens and does not retain memory of previous responses.
Nicole C. Smith +2 more
doaj +1 more source
New records of fishes (Actinopterygii: Ostariophysi) from the Upper Tapajós River Basin
Check List, 2012 The first report of Sartor (Anostomidae) and Tatia intermedia (Auchenipteridae) for the Upper Tapajós River Basin are presented here. Sartor is very rare on collections, and is reported only from the Trombetas, Tocantins and Upper Xingu river basins. Tatia intermedia is registered in the upper reaches of the Araguaia, Tocantins, Xingu, and Capim rivers,
Dagosta, Fernando +2 more
openaire +5 more sources
Rivista Italiana di Paleontologia e Stratigrafia, 1990 The Norian beds of the Southern Calcareous Alps have yielded at least four species belonging to Saurichthys. Their vertebral column has large praezygapophyses, which, in each of these nominai species, attain a different relative length. The latter is inversely proportional to age: in fact, the youngest two, coeval species have the longest ...
openaire +3 more sources
Fishes (Osteichthyes: Actinopterygii) from igarapés of the rio Acre basin, Brazilian Amazon
Check List, 2013 This study presents a list of species from igarapés tributaries of the rio Acre, Acre State, Brazil. Fish assemblages were sampled in October 2009, August and October 2010, using standard ichthyological gear, along fifteen sampling sites. A total of 11,395 specimens, distributed in 94 species, 24 families and six orders were collected. The most species-
Claro-García, Alexander +4 more
openaire +5 more sources