Electrified Dozer Trawl

Description

An electrified Push Trawl for surface trawling
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An electrified Push Trawl for surface trawling. (Non-electrified applications target predominately smaller fish whereas electrified Dozer trawls increase capture of larger-bodied fishes). The frame trawl consists of netting attached to a rectangular frame. The net frame and boat hull are the cathode electrode paired with metal anode droppers suspended in front of the net mouth. 

For non-electrified Dozer trawl information, see the Push Trawls module.

TypeActive, hybrid system or electrified nets
Habitat deployedSmall rivers, backwaters, flooded tributaries, and lakes. Shallow water, near shore. Can be used for pelagic sampling but probably not the optimal gear due to the small frame width. 
Target speciesMany different species and smaller life stages. Small to intermediate-sized fishes include juvenile Asian carp, Gar (Lepisosteidae), Suckers (Catostomidae), Sunfish and Black basses (Centrarchidae), Shads (Clupeidae), Minnows and Shiners (Cyprinidae), Common carp (Cyprinus carpio)

Example Dozer Trawl Anatomy

Drawing of a non-electrified hardware Dozer trawl set-up.
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Drawing of a non-electrified hardware Dozer trawl set-up.

Netting is attached to the rectangular frame and is suspended under the boat hull.

Bow of electrified Dozer Trawl showing trawl netting and boom anode electrodes in non-sampling, raised position.
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Bow of electrified Dozer Trawl showing trawl netting and boom anode electrodes in non-sampling, raised position.

Frame Electrified Dozer Trawl
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Introduction: Frame Electrified Dozer Trawl

VIDEO: https://youtu.be/6m2vhZuAtgE

Overview Frame Trawl Nets
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Overview Frame Trawl Nets

VIDEO: https://youtu.be/Z4S28L5j9lw

Field Methods

Frame Net Push Trawl Sampling
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Frame Net Push Trawl Sampling  

For more information on non-electrified frame Push Trawls, view the “Push Trawl” module

VIDEO: https://youtu.be/SNyYYJvKIsE

Electrified Dozer Trawl Operations Small Stream
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Electrified Dozer Trawl: Operations Small Stream

VIDEO: https://youtu.be/WHiCvwXiCpQ

Electrified Dozer Trawl: Operations Large River
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Electrified Dozer Trawl: Operations Large River

VIDEO: https://youtu.be/U3sjpeHMeSI

Electrified Dozer trawl being placed into location to make a sampling pass.
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Electrified Dozer trawl being placed into location to make a sampling pass. The frame trawl is raised, and the anode booms are swung around rearward in storage or traveling positions.

Electrified Dozer trawl being readied to make a sampling pass.
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Electrified Dozer trawl being readied to make a sampling pass. The frame trawl is being lowered into the water and the boom anodes are being swung around to a forward position.

A sampling pass underway
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A sampling pass underway. The push trawl is in sampling position behind the array of dropper electrodes supported by the two anode booms.

The sampling pass is completed, the trawling has stopped, and the frame trawl is being lifted by mechanical winches.
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The sampling pass is completed, the trawling has stopped, and the frame trawl is being lifted by mechanical winches.

The frame is fully out of the water with most of the trawl netting.
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The frame is fully out of the water with most of the trawl netting.

The frame trawl has been fully lifted from the water and brought onto the deck.
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The frame trawl has been fully lifted from the water and brought onto the deck. The cod end will be opened allowing the catch to be processed.

Examining part of the catch.
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Examining part of the catch.