Distribution of bottom-trawl fish assemblages over the continental shelf and upper slope of the U.S. west coast, 1977-1992

1996 ◽  
Vol 53 (6) ◽  
pp. 1203-1225 ◽  
Author(s):  
C V Jay
Keyword(s):  
Continental Shelf ◽  
West Coast ◽  
Fish Assemblages ◽  
Bottom Trawl ◽  
The U.S ◽  
Upper Slope

scholarly journals Demersal fish assemblages and habitat characteristics on the continental shelf and upper slope of the north-western Mediterranean

2000 ◽  
Vol 80 (6) ◽  
pp. 981-988 ◽  
Author(s):  
Montserrat Demestre ◽  
Pilar Sánchez ◽  
Pere Abelló
Keyword(s):  
Continental Shelf ◽  
Fish Species ◽  
Fish Assemblages ◽  
Demersal Fish ◽  
Western Mediterranean ◽  
Habitat Characteristics ◽  
Species Assemblages ◽  
The North ◽  
Benthic Sediments ◽  
Upper Slope

Continental shelf and upper slope fish communities were studied along the Catalan coast based on 66 experimental bottom otter trawls. A total of 79 demersal fish species were studied by means of cluster analysis and multi-dimensional scaling (MDS) ordination for community structure. Analysis revealed the existence of five major location clusters. Similarity percentage analysis (SIMPER) was determined by comparing the dissimilarity between two groups of samples using the discriminating species. Geomorphological characteristics, bottom substratum and depth showed direct influences on species assemblages. High correlation between the biotic data samples and depth was observed. The fish species assemblages identified five main demersal fish associations which corresponded with the five location clusters and with five benthic sediments (mud of the upper slope, sand and gravel, mud of the shelf, muddy-sand and sand with rocky outcrops).

Biogeography of continental shelf and upper slope fishes off El Salvador, Central America

2014 ◽  
Vol 95 (3) ◽  
pp. 611-622
Author(s):  
Claudia I. Fuentes ◽  
Enzo Acuña ◽  
Numa R. Hernández
Keyword(s):  
Cluster Analysis ◽  
Continental Shelf ◽  
El Salvador ◽  
Central America ◽  
Fish Community ◽  
Fish Assemblages ◽  
Central Zone ◽  
Outer Continental Shelf ◽  
Main Factor ◽  
Upper Slope

The present research provides detailed information on the geographic and bathymetric distributional patterns of fishes and describes the main species assemblages of the continental shelf and upper slope off El Salvador. The sampling was based on 673 bottom-trawl tows taken during research surveys from April to November 2003. The data analysis was based on presence-absence matrixes and was conducted with PRIMER 6 software. A total of 148 fish species were recorded during the study period: the families with the highest number of species were Sciaenidae (13) and Carangidae (10), and the highest percentages of occurrence were registered for Porichthys margaritatus (40.6%), Pontinus sp. (34.8%) and Monolene dubiosa (33.1%). The cluster analysis by depth showed three faunistic associations: (1) on the inner and part of the mid continental shelf (20–60 m), (2) one bathymetric stratum on the mid continental shelf (80–100 m), and (3) on the outer continental shelf and upper slope (120–240 m). The cluster analysis by geographic zones showed separation between three zones: Western, Central and Eastern Zones off El Salvador. The Central zone is characterized by a different fish community of mixed habitat, while the main factor that determined the fish assemblages on the continental shelf and upper slope was depth.

Examining the importance of consistency in multi-vessel trawl survey design based on the U.S. west coast groundfish bottom trawl survey

2004 ◽  
Vol 70 (2-3) ◽  
pp. 239-250 ◽  
Author(s):  
Andrew B. Cooper ◽  
Andrew A. Rosenberg ◽  
Gunnar Stefánsson ◽  
Marc Mangel
Keyword(s):  
West Coast ◽  
Survey Design ◽  
Bottom Trawl ◽  
Trawl Survey ◽  
Bottom Trawl Survey ◽  
The U.S
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