Underwater video techniques for observing coastal marine biodiversity: A review of sixty years of publications (1952–2012) Auteur(s) : Mallet, Delphine Pelletier, Dominique Éditeur(s) : Elsevier Science Bv Résumé : Underwater video techniques are increasingly used in marine ecology studies. Technological progress regarding video cameras, sensors (such as sounders), battery life and information storage make these techniques now accessible to a majority of users. However, diver-based underwater visual censuses, and catch and effort data, remain the most commonly used for observing coastal biodiversity and species. In this paper, we review the underwater video techniques that have been developed since the 1950s to investigate and/or monitor coastal biodiversity. Techniques such as remote underwater video, whether baited or not, diver-operated video and towed video are described, along with corresponding applications in the field. We then analyse the complementary of techniques, first from studies comparing video techniques with other observation techniques, whether video-based or not, and second by documenting their respective cost efficiencies. These findings are discussed with respect to current challenges in monitoring and investigating coastal biodiversity. Video should be more often considered and used, either in addition to or as an alternative to diver-based, fishing and acoustic techniques, as it may be particularly suited for monitoring coastal biodiversity in a variety of areas and on larger scales than hitherto and within an ecosystem-based approach to management and conservation. Fisheries Research (0165-7836) (Elsevier Science Bv), 2014-06 , Vol. 154 , P. 44-62 Droits : 2014 Elsevier B.V. All rights reserved. http://archimer.ifremer.fr/doc/00181/29274/27901.pdf DOI:10.1016/j.fishres.2014.01.019 http://archimer.ifremer.fr/doc/00181/29274/ | Partager |
The Recopesca Project : a new example of participative approach to collect fisheries and in situ environmental data Auteur(s) : Leblond, Emilie Lazure, Pascal Laurans, Martial Rioual, Celine Woerther, Patrice Quemener, Loic Berthou, Patrick Éditeur(s) : Mercator Ocean Résumé : Face to the lack of data to assess precisely the spatial distribution of catches and fishing effort and for the environmental characterization of the fishing area, Ifremer has been implemented since 2005 a new project, Recopesca. It consists in fitting out a sample of voluntary fishing vessels with sensors recording data on fishing effort (and at mid-terms catches) and physical parameters such as temperature or salinity. Recopesca aims at setting up a network of sensors, for scientific purposes, to collect data and improve resources assessment and diagnostics on fisheries, and environmental data required for ecosystem-based management initiatives. The challenge was to develop sensors with no trouble for the fishermen, tough enough to be fixed up on fishing gears, self powered and autonomous. Insofar as the sample of targeted vessels intends to be representative of all the metiers and fleets, the sensors are modular and scalable to collect new data. Different sensors have been implemented: (i) a temperature-salinity sensor, able to record physical parameters, depth and duration of immersion, for passive and active gears, and (ii) a specific sensor to record number or length of passive gears. A GPS monitors the position of the vessels and the temperature or salinity profiles and series. Each sensor is equipped with a radio device transferring the data to a receiver on-board, called “concentrator” that sends the data to Ifremer central databases by GPRS. An anti-rolling weigh-scale has been developed and is currently on test to record catches per species and fishing operation. The presentation will show the first data and results of this participative approach. Mercator Ocean - Quarterly Newsletter (Mercator Ocean), 2010-04 , N. 37 , P. 40-48 Droits : 2010 Mercator Ocean http://archimer.ifremer.fr/doc/00024/13500/10514.pdf http://archimer.ifremer.fr/doc/00024/13500/ | Partager |