Results 31 to 40 of about 34,528 (205)
Efficiency of the bottom trawl used for the Mediterranean International Trawl Survey (MEDITS) [PDF]
, 1999 The aim of the work presented in this paper was to assess the relative efficiency of the GOC 73 sampling trawl used for the Mediterranean international trawl survey programme (MEDITS) compared with that of a typical Italian commercial trawl. The latter was chosen because it is commonly used by fishermen in the central Adriatic, where the experiment was
Fiorentini, Loris +4 more
openaire +1 more source
Assessing Trawl-Survey Estimates Of Frequency Distributions
, 2000 No abstracts are to be cited without prior reference to the author.Marine trawl surveys catch a cluster of fish at each station and fish caught together tend to have more similar characteristics, such as length, age, stomach contents etc., than those in the entire population.
Pennington, Michael +2 more
openaire +2 more sources
Spatio-temporal patterns of macrourid fish species in the northern Mediterranean Sea
Scientia Marina, 2019 The present study describes for the first time the spatial distribution of five macrourid species throughout the Mediterranean Sea and analyses depth, geographical and time-related trends regarding their abundance, biomass and mean fish weight.
Cristina García-Ruiz +11 more
doaj +1 more source
Deep vision: an in-trawl stereo camera makes a step forward in monitoring the pelagic community. [PDF]
PLoS ONE, 2014 Ecosystem surveys are carried out annually in the Barents Sea by Russia and Norway to monitor the spatial distribution of ecosystem components and to study population dynamics.
Melanie J Underwood +3 more
doaj +1 more source
Effects of Gear Modifications on the Trawl Performance and Catching Efficiency of the West Coast Upper Continental Slope Groundfish Survey Trawl [PDF]
, 1998 Since 1984, annual bottom trawl surveys of the west coast (California–Washington) upper continental slope (WCUCS) have provided information on the abundance, distribution, and biological characteristics of groundfish resources. Slope species of the deep-
Lauth, Robert R. +2 more
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Density Dependent Catchability In Bottom Trawl Surveys
, 1997 No abstracts are to be cited without prior reference to the author.Fish form schools, layer or patches in which the individual fish's behaviour is not independent ofits neighbours movements. On the other hand, at low densities fish may have the freedom to actas single individuals independently of what other fish are doing.
Aglen, Asgeir +5 more
openaire +2 more sources
Scientia Marina, 2019 The main characteristics concerning the distribution of two of the most important decapod crustaceans of commercial interest in the Mediterranean Sea, the deep-water rose shrimp, Parapenaeus longirostris, and the Norway lobster, Nephrops norvegicus, are ...
Mario Sbrana +15 more
doaj +1 more source
Comparison of habitat-based indices of abundance with fishery-independent biomass estimates from bottom trawl surveys [PDF]
, 2012 Rockfish species are notoriously difficult to sample with multispecies bottom trawl survey methods. Typically, biomass estimates have high coefficients of variation and can fluctuate outside the bounds of biological reality from year to year.
Martin , Michael H. +1 more
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Fishes, 2022 Data were combined from surveys in 2013, 2018, 2019 and 2021 to examine biomass changes of the skate (Rajiformes) stock in waters around the Falkland Islands.
Andreas Winter, Alexander Arkhipkin
doaj +1 more source
The effect of autotrawl systems on the performance of a survey trawl [PDF]
, 2006 Three aspects of a survey bottom trawl performance—1) trawl geometry (i.e., net spread, door spread, and headrope height); 2) footrope distance off-bottom; and 3) bridle distance off-bottom—were compared among hauls by using either of two autotrawl ...
Kotwicki, Stan +2 more
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