Results 241 to 250 of about 103,342 (262)

Impact of Fishing on the Abundance of Marine Species

2002
No abstracts are to be cited without prior reference to the author.The Census of Marine Life program aims to document the existence, distribution and abundance of marine organisms using all suitable data sources. In this study we analysed time series of catch data published by ICES and FAO in respect to trends in the resilience of species towards ...
Froese, Rainer, Kesner-Reyes, Kathleen
openaire   +1 more source

Spatial patterns in the abundance and distribution of parasites of freshwater fish

Parasitology Today, 1994
It is not yet known whether the abundance and distribution of freshwater fish parasites form spatial patterns. Here, Rita Hartvigsen and Odd Halvorsen review the main approaches to the study of spatial patterns of these parasites, and propose an alternative approach based on meta-population theory and landscape ecology.
R, Hartvigsen, O, Halvorsen
openaire   +2 more sources

Fish abundance, distribution, and habitat use

1999
The 1996 controlled flood in the Colorado River, Grand Canyon, was designed, in part, to improve conditions for juvenile native fishes by reshaping habitat and displacing non-native fishes. We examined changes in abundance and distributions of native and non-native fishes immediately before and after the controlled flood and recovery of affected ...
Timothy L. Hoffnagle, Richard A. Valdez, David W. Speas   +2 more
openaire   +1 more source

Variation in hydroacoustic abundance of pelagic fish

Fisheries Research, 1993
Abstract The variation in hydroacoustic abundance of pelagic fish was studied in Baltic coastal areas. Comparisons between zigzag transects and straight transects in the middle of a study area showed no consistent differences and neighbouring areas had generally similar abundances.
openaire   +1 more source

Positive relationships between genetic diversity and abundance in fishes

Molecular Ecology, 2010
AbstractMolecular markers, such as mitochondrial DNA and microsatellite loci, are widely studied to assess population genetics and phylogeography; however, the selective neutrality of these markers is increasingly being questioned. Given the importance of molecular markers in fisheries science and conservation, we evaluated the neutrality of both mtDNA
Megan R, McCusker, Paul, Bentzen
openaire   +2 more sources

Target strengths of two abundant mesopelagic fish species

The Journal of the Acoustical Society of America, 2015
Mesopelagic fish of the Myctophidae and Sternoptychidae families dominate the biomass of the oceanic deep scattering layers and, therefore, have important ecological roles within these ecosystems. Interest in the commercial exploitation of these fish is growing, so the development of techniques for estimating their abundance, distribution and ...
Scoulding, B.C., Chu, D., Ona, E., Fernandes, P.G.   +3 more
openaire   +2 more sources

Abundance/host size relationship in a fish trematode community

Journal of Helminthology, 1992
ABSTRACTThe abundance of six species of trematodes: Aphanurus stossichi, Bacciger israelensis, Diphterostomum israelense, Plagioporus idoneus, Lepocreadium album and L. pegorchis, parasitic in the digestive tract of marine teleostei (Sparidae) collected near Jounieh (east Mediterranean), was analysed as a function of the host-size. In two parasite/host
A, Saad-Fares, C, Combes
openaire   +2 more sources

The distribution and abundance of young fish in the Banc d'Arguin, Mauritania

Hydrobiologia, 1993
The importance of the Banc d’Arguin (Mauritania) for juvenile fish has been investigated in September 1988. Fish have been sampled with a 2 m beam trawl at 50 locations in the coastal zone between Cap Sainte Anne and Cap Timiris. Water depth varied between 1 and 16 metres.
openaire   +1 more source

An "Abundance of Fish"

Science, 1972
openaire   +2 more sources

Spatio–temporal variations in the distribution and abundance of fish in the Yorkshire Ouse system

Science of the Total Environment, 1998
Jan Kubecka
exaly