ULTIMO AGGIORNAMENTO BANCA DATI: 13/09/2024 13:00:57
Sentiment analysis functions by analyzing and extracting opinions from documents, websites, blogs, discussion forums and others to identify sentiment patterns on opinions expressed by consumers. It analyzes people's sentiment and identifies types of sentiment in comments expressed by consumers on certain ...
Mega hydropower projects in tropical forests pose a major emergent threat to terrestrial and freshwater biodiversity worldwide. Despite the unprecedented number of existing, under-construction and planned hydroelectric dams in lowland tropical forests, long-term effects on biodiversity have yet to be ...
The jack mackerel population has been assessed directly by fisheries acoustics without consider the day-night fish school behavior. In this paper the day-night effect on spatial structure of Jack mackerel is analyzed from fisheries acoustics surveys. The diel behavior of fish schools was assessed by ...
Droughts have been recorded all across Canada and have had significant impacts on individuals and communities. With climate change, projections suggest an increasing risk of drought in Canada, particularly in the south and interior. However, there has been little research on the impacts of drought on ...
From 15 to October 24, 2013, the second hydroacoustic survey cruise T13-10-02P aboard the B/I Tohalli, made with emphasis on small pelagic fish in the Gulf of Guayaquil was ejecuted. The biomass estimated was Auxis thazard 121.976 t, Scomber japonicus 70.818 t, Decapterus macrosoma 23.894 t and Opisthonema ...
The austral sardine (Sprattus fuegensis) is the target fish resource of a small-scale fishery operating in the Patagonian waters of Chile (41°30'S-46°00'S). Purse seine boats composed the fleet and landings have fluctuated between 14,344 and 48,589 tons during the period between 2006 and 2014. The stock ...
The Brazilian sector of the Pelotas Basin (PB) covers an area of 210,000 km2, limited northwards by the Florianópolis High southwards by the boundary with Uruguay. The PB is economically and strategically important due to the presence of sub-surface mineral resources such as oil, natural and hydrate ...
In this work scientific echosounder were used hull mounted onboard R/V Marion Dufresne II to scrutinize the vertical distribution of micronekton according to water masses characteristics along transect which were discriminated with spatial remote sensing data. Acoustic data were collected continuously ...
Various marine lives are mainly cultured from fish farms. This study focused on the abalone among many marine lives to research on the underwater monitoring system which monitors its growth and development and the amount of sludge. The insufficient feeding in the farm causes growth inhibition of abalone ...
The Peruvian ""anchovy"" (Engraulis ringens) maintains the world's largest single species fishery in the world. Acoustic data from research cruises surveying the distribution area of this species provide meaningful information about its behavior and distribution as well as its abundance within years ...
Timing synchronization is essential in cases where multiple sensor nodes with ultrasonic sensors are deployed in the same place. This is because ultrasonic sensors should be powered at a precise timing so as to prevent ultrasonic interference. A harmful-birds scaring system utilizing a new timing-synchronization ...
With the fast motion and rapid population increase in the World, feeding of the population has become an important problem. In 1500s, the world population was less than 1 billion while it reached 2.5 billion in 1900 and 7 billion in 2015. In the last century, the world population increase has exploded ...
Human-induced changes to habitats can have deleterious effects on many species that occupy them. However, some species can adapt and even benefit from such modifications. Artificial reefs have long been used to provide habitat for invertebrate communities and promote local fish populations. With the ...
A common practice in acoustic data post-processing is to set, a priori, the intervals of volume backscattering strength for small pelagic fishes zooplankton, which may induce a bias in biomass estimations. To reduce this, a method based in the joint probability event to find one of these groups was ...
Merluccius productus is subject of an important fishery in the North Pacific. In Mexico, this fishery is not fully developed; however, this species is considered a potential resource because of its presence in the west coast of the Baja California peninsula and in the Gulf of California. Recent efforts ...
Hydroacoustic techniques are the most suitable means for the remote sensing of the aquatic environments. Passive acoustics is the action of receiving sounds originated by different sources in the surrounding medium. The sound waves produced by a source are captured by a hydrophone and can be used to ...
In a fishery assessment context, Artificial Neural Networks (ANNs), among other techniques, have been intensively tested for the identification of fish species and pursuing the automatic classification of the schools, based on descriptors extracted from digital echosounder recordings. Prediction of ...
We have been using scientific echo-sounders to map and quantify Engraulis anchoita in the Southern coast of Brazil. This is a low trophic level species and a link from primary producers to top predators. Echo-records collected along thousands of nautical miles contain information about migratory habits ...
The distribution of fish in the water column, particularly of demersal species near the seabed, is relevant to the detection and assessment of fish populations. Here, acoustic data recorded during six consecutive seasons on the Patagonian stock of argentine hake (Merluccius hubbsi) provided detailed ...
Identifying the various drivers of marine ecosystem regime shifts and disentangling their respective influence are critical tasks for understanding biodiversity dynamics and properly managing exploited living resources such as marine fish communities. Unfortunately, the mechanisms and forcing factors ...