The trawl body is always a tapered section.

the trawl body means the tapered section in the front part of a trawl net

trawl means gear which is actively towed by one or more fishing vessels and consisting of a net having a cone- or pyramid-shaped body (as trawl body) closed at the back by a codend

(e) ‘the extension piece’ means the untapered section, made of one or more panels, between the trawl body and the cod-end;

(e) ‘the extension piece’ means the untapered section, made of one or more panels, between the trawl body and the cod-end;