Efficiency of bycatch reduction devices in small otter trawls used in the Florida shrimp fishery

The extended mesh funnel (EMF) and Florida fisheye (FFE) bycatch reduction devices (BRD) were evaluated in otter trawls with three different sized openings (circumference = 14 m, 17 m, and 20 m). The mean ratio of finfish bycatch to shrimp in nets equipped with BRD's was substantially lower but not significantly different than the ratios in the control nets. The biomass and number of finfish was lower and significantly different in nets equipped with the BRD's compared to the control nets except in the winter, and the catch per unit effort of finfish was always lower in the nets equipped with the BRD's. The number and biomass of shrimp was not reduced in the 17 m or 20 m nets equipped with the BRD's and differences in the catch per unit effort of shrimp between nets with the BRD's and the control net varied by season and net size.
Field Studies:

Location	Fishing gear	Reduction technique	Bycatch species	Effect on bycatch species	Catch	Effect on target catch	Type
Florida	Trawls	Fish escape windows/separator devices	Bony Fishes	Reduced the biomass and number of finfish and the catch per unit effort	Shrimp	The number and biomass was not reduced in the 17 m or 20 m nets and the catch per unit effort varied by season and net size. Less shrimp was caught in the winter using the 14m nets.	In the wild