Since the 1990s, massive use of drifting Fish Aggregating Devices (dFADs) to aggregate tropical tunas has strongly modified global purse-seine fisheries. For the first time, a large data set of GPS positions from buoys deployed by French purse-seiners to monitor dFADs is analysed to provide information on spatio-temporal patterns of dFAD use in the Atlantic and Indian Oceans during 2007-2011. F...

Nylon (PA) netting is widely used in purse seines and other fishing gears due to its high strength and good sinking performance. However, hydrodynamic properties of nylon netting of different characteristics are poorly understood. This study investigated hydrodynamic characteristics of nylon netting of different knot types and solidity ratios under different attack angles and flow velocities. I...

An advection-diffusion model in which movement parameters are variable in both time and space is applied to the analysis of skipjack tag and recapture data. Two data sets spanning the periods 1977-1982 and 1989-1992 are analysed. The results indicate that skipjack movement is highly variable in time and space with very little coherent pattern. The estimated movement pattern mortality and catcha...

,:From its start nearly 60 years ago the California tuna fishery has ',own into the state's largest fishery, both in val)le and in pounds "nded (Power, 1960). Yellowfin tuna (Neothunnus macropterus) and ~, ,'pjack (][atwwonus pelarnis) now are the two most important species , nd comprise the bulk of the California tuna landings. These are topical tunas and seldom enter California waters in comm...

Purse Seine fishing gear is a operated by several fishermen in the WPP NRI 571. seine type of that classified as surrounding nets, which an active to catch pelagic fish who generally live groups large flocks. The main Mackerel scad (Decapterus spp). purpose this study was determine level environmental friendliness PPS Belawan. method used using score based on Code Conduct for Responsible Fisher...

Executive Summary The analysis of Vessel Monitoring System (VMS) data from the equatorial purse-seine fleet has the potential to increase the understanding of the operation of the fishery and lead to the quantification of the effective fishing effort expended by the fleet. In turn, this may enable the development of metrics that provide indicators of the performance of the fishery and, potentia...

Using stomach contents from 203 spotted dolphins (Stenella attenuata) killed in the yellowfin tuna fishery, we modeled the weaning process of calves. Spotted dolphins began to take solid food at approximately 6 mo of age, or 115 cm, but continued to suckle until they were nearly 2 yr old. Calves tended to feed more frequently on squid as they got older, which suggested there was a shift in diet...