Consulta: subjectFacets:"Fish behavior"
Registros recuperados: 6
Data/hora: 02/06/2024 08:27:39

Vessel Avoidance Response: A Complex Tradeoff Between Fish Multisensory Integration and Environmental Variables
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Brehmer, Patrice; Sarré, Abdoulaye; Guennegan, Yvon; Guillard, Jean.
The avoidance reaction by fish in front of an approaching vessel is a major source of bias in direct biomass assessment and ecological studies based on fisheries acoustics data. An experiment was carried out to compare echosounder data obtained using a small speedboat and a research fisheries vessel generating significant higher noise above conventional reduced-noise standard. The results show that there was no significant difference between the individual fish target strength distributions, and the numbers of schools recorded by both boats, these schools having similar areas and perimeters. However, the schools detected by the noisier vessel were significantly deeper, and unexpectedly had a significantly higher energy level. These findings suggest that...
Tipo: Text
Palavras-chave: Vessel avoidance; Fish behavior; Fisheries acoustics; Small pelagic assessment; Fish school; Boat noise.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00487/59906/63102.pdf

Fish wariness is a more sensitive indicator to changes in fishing pressure than abundance, length or biomass
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Goetze, Jordan S.; Januchowski-hartley, Fraser A.; Claudet, Joachim; Langlois, Tim J.; Wilson, Shaun K.; Jupiter, Stacy D.
Identifying the most sensitive indicators to changes in fishing pressure is important for accurately detecting impacts. Biomass is thought to be more sensitive than abundance and length, while the wariness of fishes is emerging as a new metric. Periodically harvested closures (PHCs) that involve the opening and closing of an area to fishing are the most common form of fisheries management in the western Pacific. The opening of PHCs to fishing provides a unique opportunity to compare the sensitivity of metrics, such as abundance, length, biomass and wariness, to changes in fishing pressure. Diver-operated stereo video (stereo-DOV) provides data on fish behavior (using a proxy for wariness, minimum approach distance) simultaneous to abundance and length...
Tipo: Text
Palavras-chave: Artisanal fisheries; Catch efficiency; Compliance; Conservation; Customary management; Fish behavior; Fisheries management; Flight initiation distance.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00610/72247/71050.pdf

Analysis and visualization of the glass eel behavior (Anguilla anguilla) in the Adour estuary and estimate of its upstream migration speed
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Prouzet, Patrick; Odunlami, Marc; Duquesne, Elise; Boussouar, Ahmed.
The studies carried out on the Adour estuary on the migration of glass eels lead to the characterisation of their swimming behavior. Individuals migrate passively with the flood tide current behind the dynamic tide front, and their movements into the water column are linked to the surrounding luminosity and water turbidity. A numerical model was built from observations gathered on glass eel densities during scientific surveys. It uses the outputs of a hydrodynamic model accounting for the variations in the river flow and tide coefficient. It allows the simulation of the displacement of a particle in the longitudinal axis of the estuary. The variation of the vertical movements through the water column takes into account the cloud cover, the moon phases, the...
Tipo: Text
Palavras-chave: Numerical modeling; Fish behavior; Migration; Estuary; Hydrodynamics; Exploitation rate; Glass eel; Anguilla anguilla; Atlantic Ocean.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00000/11171/7531.pdf

Acoustical monitoring of fish density, behavior, and growth rate in a tank
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Conti, Stéphane; Roux, Philippe; Fauvel, Christian; Maurer, Benjamin; Demer, David.
A challenge for the aquaculture community has long been the development of harmless techniques for monitoring fish in a tank. Acoustic telemetry has been used to monitor fish swimming behavior, and passive acoustics have been used to monitor fish feeding, but new techniques are needed to monitor non-invasively their numbers and growth rates. Recently, it has been demonstrated that the acoustical total scattering cross section of fish swimming in a tank can be measured from multiple reverberation time series. These measurements have been used successfully to estimate the number of fish in a tank in laboratory conditions, and to characterize their acoustical signatures. Here, we introduce a novel method for acoustically monitoring fish numerical density and...
Tipo: Text
Palavras-chave: Total scattering cross section; Fish counting; Growth rate; Remote monitoring; Fish behavior.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1121.pdf

Effects of tourist visitation and supplementary feeding on fish assemblage composition on a tropical reef in the Southwestern Atlantic
Provedor de dados: Neotropical Ichthyology
Autores: Ilarri,Martina Di Iulio; Souza,Allan Tainá de; Medeiros,Paulo Roberto de; Grempel,Renato Grotta; Rosa,Ierecê Maria de Lucena.
The effects of tourist visitation and food provisioning on fish assemblages were assessed by visual censuses (stationary technique) carried out in a tropical reef in Northeastern Brazil. Comparisons of species abundance, richness, equitability, and trophic structure in the presence (PT) and absence (AT) of tourists suggest that tourist visitation and supplementary food influenced the structure of the fish assemblage, as follows: (a) diversity, equitability and species richness were significantly higher on the AT period, while the abundance of a particular species was significantly higher during PT; (b) trophic structure differed between the AT and PT periods, omnivores being more abundant during the latter period, while mobile invertivores, piscivores,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish behavior; Tourism; Human impact; Northeastern Brazil; Abudefduf saxatilis.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400014

Fishermen's local ecological knowledge on Southeastern Brazilian coastal fishes: contributions to research, conservation, and management
Provedor de dados: Neotropical Ichthyology
Autores: Silvano,Renato A. M.; Begossi,Alpina.
We analyzed fishermen's local ecological knowledge (LEK) about the feeding habits, trophic interactions, habitats, fishing grounds, migration, and reproduction of nine coastal fishes in Búzios Island, southeastern Brazilian coast. We interviewed 39 fishermen using standardized questionnaires. Fishermen's LEK on habitat use and trophic interactions for the studied fishes agreed with the scientific literature, allowing the organization of reef and pelagic food webs. The interviewed fishermen mentioned that submerged rock formations would be important habitats for some large commercial fishes, such as Seriola spp., Caranx latus and Epinephelus marginatus. In some instances there was no scientific data to be compared with fishermen's LEK, and thus this kind of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ethnobiology; Fish behavior; Fish ecology; Human ecology; Small-scale fisheries.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000100013