Concept
Semi-Balloon Otter Trawl
| URI | http://vocab.nerc.ac.uk/collection/L22/current/NETT0193/ |
|---|---|
| Within Vocab | SeaVoX Device Catalogue |
| Preferred Label | Semi-Balloon Otter Trawl |
| 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. |
| Broader |
L05:
demersal trawl nets |
| Related |
B75:
Unspecified L35: Unknown |
| Narrower |
L22:
Semi-Balloon Otter Trawl (14 m headrope; single-warp operation) - Merrett and Marshall (1980) |
| Note | accepted |
| Deprecated | false |
| Alternative Label | OTSB |
| Version | 1 |
| Has Current Version | http://vocab.nerc.ac.uk/collection/L22/current/NETT0193/1/ |
| Authored On | 2020-03-09 19:18:14 |
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