Bait loss and its potential effects on fishing power in pelagic longline fisheries

SCIENTIFIC COMMITTEE THIRD REGULAR SESSION 13-24 August 2007 Honolulu, United States of America BAIT LOSS AND ITS POTENTIAL EFFECTS ON FISHING POWER IN PELAGIC LONGLINE FISHERIES WCPFC-SC3-FT SWG/WP-6

We analyzed 1950s survey data with generalized estimating equations (GEEs) to quantify factors that influence the rate that bait is lost from pelagic longlines. Hook depth, bait species, local tuna abundance, and the timing of longline operations strongly influenced loss rates. Loss rates increased with tuna abundance and soak time. They declined with hook depth and were low for firm-bodied bai...

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...

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...

Pelagic Longline Fishing Gear: A Brief History and Review of Research Efforts to Improve Selectivity

Pelagic longline gear had several independent evolutions, but the most widespread form appears to have been originally developed by the Japanese as early as the mid-19th century. Technological developments such as polyamide monofilament line and modern fishing vessel construction have resulted in the evolution and expansion of this gear type as the primary worldwide method of commercially harve...