A meta-analysis of online publications revealed only one technique to be effective as a bycatch reduction device in longline fisheries, which involves raising demersal longlines off the seafloor using flotation. Other techniques as BRDs include monofilament leaders which, like floating demersal longlines, are suggested as promising approaches for further evaluation. Although not effective as a deterrent, circle hooks may increase survivaility post-hooking. 

This study examined spatial interactions between false killer whales (Pseudorca crassidens) and the Hawaii-based deep-set longline fishery. False killer whales occur as bycatch in this fishery that exceed allowable levels. Five satellite tagged whales (occurring within three groups) in combination with logbook entries showed that only two groups of whales approximated gear at a distance closer than 50km. On two occasions whales from one group came close enough to interact with gear, and one of six sets involved had no catch which may be explained by depredation. The haul phase showed the highest “attraction effect,” and the results suggest this portion of fishing activity may be an important factor in bycatch, especially seeing as at other times the whales showed limited time interacting with gear.

A computer model was produced to provide insight into how the Critically Endangered North Atlantic right whale (NARW) becomes entangled. It allows an anatomically accurate model of a NARW Population estimates of the critically endangered North Atlantic right whale to "swim" into fishing pot ropes, that incorporate realistic physical properties and can generate measures of physical forces (such as rope tension). Modeled entanglement events showed that those  involving the pectoral flippers with body wraps were more easily generated than entanglements involving the tailstock only. The simulator is intended as a tool for testing potential new gear configurations.

The study assessed the efficacy of applying bird scaring line regulations from the demersal longline fishery in Alaska to a similar fishery along the U.S. West Coast. However, unlike in the  Alaskan sablefish fishery, some U.S. West Coast sablefish vessels utilize floated longlines. Results from the study confirmed that bird scaring regulations from Alaska were sufficient to protect baits from bird attacks on longlines without floats, but not baits with floats. One reason for this pattern might be that floated longlines sink more slowly, meaning that the lines are typically beyond the protection of the bird scaring lines before they sink below the reach of seabirds such as albatrosses. The analysis also confirmed testimonials from fishermen that night setting reduced albatross bycatch by an order of magnitude compared to daytime setting, without reducing target catch. The use of night setting may be an effective albatross bycatch prevention practice for the West Coast sablefish fishery, and provides an alternative to bird scaring lines for vessels using floated longlines.