Results 11 to 20 of about 501,047 (303)
Environmental DNA, 2021 Measures of environmental DNA (eDNA) concentrations in water samples have the potential to be both a cost‐efficient and a nondestructive method to estimate fish population abundance.
Eric Capo +7 more
doaj +2 more sources
Fish abundance with no fishing: predictions based on macroecological theory [PDF]
Journal of Animal Ecology, 2004 SummaryFishing changes the structure of fish communities and the relative impacts of fishing are assessed usefully against a baseline. A comparable baseline in all regions is fish community structure in the absence of fishing.The structure of unexploited communities cannot always be predicted from historical data because fisheries exploitation usually ...
Jennings, Simon, Blanchard, Julia L.
openaire +4 more sources
Spawning aggregations of checkered snapper (Lutjanus decussatus) and blackspot snapper (L. fulviflamma): seasonality, lunar-phase periodicity and spatial distribution within spawning ground [PDF]
PeerJ, 2023 Snappers (family Lutjanidae) are important fisheries target species and some species are known to form spawning aggregations at particular spawning grounds. The present study investigated the ecological characteristics of fish aggregations of two snapper
Atsushi Nanami
doaj +2 more sources
Climate and local abundance in freshwater fishes [PDF]
Royal Society Open Science, 2016 Identifying factors regulating variation in numbers of individuals among populations across a species' distribution is a fundamental goal in ecology. A common prediction, often referred to as the abundant-centre hypothesis, suggests that abundance is highest near the centre of a species' range.
Jason H. Knouft, Melissa M. Anthony
openaire +3 more sources
Fish predation pressure on zooplankton in a large northern temperate lake: impact of adult predators versus juvenile predators; pp. 356–367 [PDF]
Proceedings of the Estonian Academy of Sciences, 2018 In recent decades, a marked decrease in planktivorous fish (Osmerus eperlanus eperlanus m. spirinchus Pallas and Coregonus albula (L.)) in Lake Peipsi has stimulated research into the potential effect of fish predation on zooplankton.
Kai Ginter +4 more
doaj +1 more source
Frontiers in Marine Science, 2020 Aquatic ecologists routinely count animals to provide critical information for conservation and management. Increased accessibility to underwater recording equipment such as action cameras and unmanned underwater devices has allowed footage to be ...
Ellen M. Ditria +5 more
doaj +1 more source
Global Ecology and Conservation, 2023 Water hyacinth (Pontederia crassipes) invasion is a growing global issue which poses a threat to aquatic life. As in the global context, the water hyacinth invasion is increasing rapidly in the lakes of Pokhara valley which is listed in Ramsar sites. Its
Rajendra Basaula +4 more
doaj +1 more source
Diversity, 2023 The offshore waters of the Yangtze Estuary are an important fish habitat, and the large gradient of environmental conditions leads to different fish assemblages.
Zhaomin Chen, Cui Liang, Weiwei Xian
doaj +1 more source
A hierarchical model to estimate the abundance and biomass of salmonids by using removal sampling and biometric data from multiple locations [PDF]
, 2010 We present a Bayesian hierarchical model to estimate the abundance and the biomass of brown trout (Salmo trutta fario) by using removal sampling and biometric data collected at several stream sections.
Laplanche, Christophe, Ruiz, Philippe
core +4 more sources
Long-term change in benthopelagic fish abundance in the abyssal northeast Pacific Ocean [PDF]
, 2006 Food web structure, particularly the relative importance of bottom-up and top-down control of animal abundances, is poorly known for the Earth's largest habitats: the abyssal plains.
Bailey, D.M., Ruhl, H.A., Smith, K.
core +1 more source