Semi-Balloon Otter Trawl
|Within Vocab||SeaVoX Device Catalogue|
|Definition||A funnel-shaped net designed to trap organisms at its closed-end while being trawled along the seafloor. It is composed of a non-fixed wide mouth attached to the main wire and held open horizontally by an otter board at each side; a tickler chain is mounted across the lower edge of the net to keep it in contact with the ground, whereas a float fixed to the top of the net ensures its vertical spread. Typically, a semi-balloon otter trawl has a mouth size of approximately 2m x 8.5m; the net has a fine mash and it is mounted to a head rope of maximum 14m in length. This type of trawl is ideal for deep-water sampling of megafauna near the seafloor, mostly for conducting species diversity, abundance and biomass studies. The semi-balloon otter trawl is also known as OTSB, OTSB 14 and Marinovitch Trawl. Ref: Methods for the Study of Marine Benthos, fourth edition by WILEY Blackwell.|
|Has Current Version||1|
||demersal trawl nets||Mapping: 1601353|
||Semi-Balloon Otter Trawl (14 m headrope; single-warp operation) - Merrett and Marshall (1980)||Mapping: 1602842|
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