Results 121 to 130 of about 267 (147)
Some of the next articles are maybe not open access.
A new midwater trawl for sampling discrete depth horizons
Journal of the Marine Biological Association of the United Kingdom, 1969A new midwater trawl based on that designed by Tucker (1951) is described with details of opening and closing equipment, acoustic release gear and depth telemetering pinger. An account is given of the method used in operating the xtrawl from R.R.S. ‘Discovery’.
openaire +1 more source
One-boat midwater trawling with unequal panelled trawl
1983Results of the comparative efficiency studies with 10.5 m equal panelled and 10.3 m unequal panelled midwater trawls operated from 10.9 m wooden trawler are presented. Out of the two nets, the latter proved to be relatively good for the capture of off bottom and column fishes like pomfrets, seer, lactarius, catfish, silver bar, ribbon fish and an ...
Mhalathkar, H.N. +3 more
openaire +2 more sources
Fish behaviour in response to a midwater trawl footrope in temperate reservoirs
Fisheries Research, 2015Abstract This study addresses fish behaviour at the mouth of a midwater trawl in two temperate reservoirs. Fish distribution and behaviour were monitored using a SIMRAD EK60 (38 kHz) split-beam echosounder with the transducer deployed at the water surface, attached to the surface trawl headrope.
Z. Sajdlová +14 more
openaire +1 more source
Stepped-Oblique Midwater Trawling as an Assessment Technique for Rainbow Smelt
North American Journal of Fisheries Management, 1991Abstract Discrete-depth midwater trawling for rainbow smelt Osmerus mordax at night in Lake Champlain revealed a delayed vertical migration of smaller fish and size partitioning vertically within the water column. These behavioral observations led to the development and evaluation of a nighttime stepped-oblique midwater trawling technique.
Richard A. Kirn, George W. Labar
openaire +1 more source
Economics of gill netting and two boat midwater trawling
1988The paper deals with the economic aspects of operation of gill netting and two boat midwater trawling conducted off Cochin. The data collected on two boat midwater trawling and gill netting during 1979 and 1980-81 are presented. Gill netting was profitable at the range of 17.5 and 25.2% while two midwater trawling was profitable at the rate of 18.5 %.
Sadanandan, K.A. +3 more
openaire +2 more sources
Depth control of a midwater trawl gear using fuzzy logic
Fisheries Research, 1995Abstract This paper describes the model of a simplified trawl system and the design of a control system that uses a fuzzy algorithm in controlling the depth of a midwater trawl net. The practicality of the control system was examined using computer simulation.
openaire +1 more source
A Simple Surface-Midwater Trawl
The Progressive Fish-Culturist, 1968Charles R. Gasaway, Victor W. Lambou
openaire +1 more source
Studies on bridle lengths in one-boat midwater trawling
1982Investigation on the comparative fishing trials to study the effect of bridles for a 10.5 m four equal panelled one-boat midwater trawl are described. Three bridle lengths of 20, 30 and 40 m were tested for relative efficiency evaluation. 30m bridles are found to be more suitable for the particular design and arbitrary selection of bridle lengths would
Mhalathkar, H.N. +2 more
openaire +2 more sources