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Predator sounds (killer whales, Orcinus orca) caused gray whales (Eschrichtius robustus) to leave an area off the California (U.S.) coast.

Pyrotechnics did not deter killer whale (Orcinus orca) depredation from longlines in Alaska (United States) over time.

Pyrotechnic cracker shells did not deter killer whales (Orcinus orca) from longlines in the Alaskan (U.S.) sablefish (Anoplopoma fimbria) fishery.

For two weeks, transmission of predator sounds (killer whales, Orcinus orca) excluded beluga whales (Delphinapterus leucas) from preying on salmon (Oncorhynchus nerka) smolts in Alaska's Kvichak River (United States).

Atlantic cod (Gadus morhua) traps equipped with pingers resulted in a reduction in collisions with humpback whales (Megaptera novaeangliae) in Newfoundland, Canada. Traps with alarms caught more fish than traps without alarms.

An acoustic release system for offshore lobster (Homarus americanus) buoy lines was successfully developed and tested for reducing right whale (Eubalanea glacialis) entanglements with vertical lines in the Gulf of Maine and southern New England (U.S.) lobster pot fishery.

A modified longline system with a net sleeve and weight on the secondary vertical line was tested in the Chilean Patagonian toothfish (Dissostichus eleginoides) fishery. A net sleeve that deploys to cover the fish/hook when hauled and a weight were attached to the vertical hook line. The net sleeve significantly reduced depredation of fish by killer whales (Orcinus orca) and sperm whales (Physeter macrocephalus). The weighted line also was able to reduce seabird bycatch deaths to zero.  

The Patagonian toothfish (Dissostichus eleginoides) longline fishery in the Southwest Atlantic suffers from depredation of fish by sperm whales (Physeter macrocephalus) and high bycatch rates of seabirds. This study assessed depredation and seabird bycatch using a modified longline with an "umbrella" net sleeve system with stones for faster sinking. The "umbrella-and-stones" system was effective for preventing bycatch and appeared to restrict depredation, but catches were significantly reduced.  

This investigation details an unusual encounter with a lunge-feeding minke whale (Balaenoptera acutorostrata) with fresh entanglement-like injuries to its head and ventral pouch.  It also discusses results from a short-term comparative study that tested whether the whale fed differently than five uninjured minke whales feeding in the same area.  Collectively, this study: 1) quantifies how much a rope-like injury can restrict the expansion of a minke's ventral pouch while feeding, 2) provides the first minke whale lunge-feeding velocities from a photogrammetric method using digital video, and 3) describes a new lunge-feeding aerial maneuver for minke whales that is possibly associated with the injury.

The Patagonian toothfish (Dissostichus eleginoides) longline fishery has high levels of depredation by killer and sperm whales (Orcinus orca;Physeter macrocephalus) , which puts the whales at risk of becoming bycatch. Observations from 2003 to 2008 revealed significant variations of interaction rates with killer whales between vessels, suggesting the influence of operational factors on vessel interaction and depredation. When killer whales were absent at the beginning of the line hauling process, short lines (<5,000 m) provided higher yield and were significantly less impacted by depredation than longer lines. The authors also recommend that when facing depredation, vessels should leave the fishing area and travel distances > 40 n miles to prevent killer whales from finding them within a few hours.