Assessing interactions between dolphins and small pelagic fish on branchline to design a depredation mitigation device in pelagic longline fisheries

Shark Depredation and Unwanted Bycatch in Pelagic Longline Fisheries

Vulnerability of the Oceanic Whitetip Shark to Pelagic Longline Fisheries

A combination of fisheries dependent and independent data was used to assess the vulnerability of the oceanic whitetip shark to pelagic longline fisheries. The Brazilian tuna longline fleet, operating in the equatorial and southwestern Atlantic, is used as a case study. Fisheries dependent data include information from logbooks (from 1999 to 2011) and on-board observers (2004 to 2010), totaling...

Sea Turtle and Pelagic Fish Sensory Biology: Developing Techniques to Reduce Sea Turtle Bycatch in Longline Fisheries

submitted to the 25 Symposium on Sea Turtle Biology and Conservation. Night-time spectral sensitivity of adult female leatherback sea turtles Levenson, D.H., Eckert, S.A. Crognale, M.A., Duhamel, P., Kubis, S.A. and Harms, C.A. Flicker electroretinography (ERG) was used to measure the spectral sensitivity of adult female leatherback sea turtles in vivo on a nesting beach on the southern Caribbe...

Pelagic longline gear depth and shoaling

Temperature-depth recorders (TDRs) were attached to pelagic longline gear in the Hawaii-based commercial fishery to obtain actual fishing depths and to test the accuracy of catenary algorithms for predicting fishing depths. Swordfish gear was set shallow by typically deploying four hooks between successive floats. The observed depth of the settled deepest hook had a median value of 60 m for 333...

Progress report on the development and testing of the underwater bait setter for pelagic longline fisheries

1. This paper summarises recent progress and future work relating to the development, construction and testing of a device that sets hooks several metres underwater to avoid detection by seabirds. 2. The underwater setter is a stern-mounted hydraulically-driven device. It comprises components that are fixed to the vessel and a component (a capsule that holds the baited hook) that is driven down...