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Acoustic monitoring to document the spatial distribution and hotspots of blast fishing in Tanzania

Research output: Contribution to journalArticle

Author(s)

Gill Braulik, Anja Wittich, Jamie MacAulay, Magreth Kasuga, Jonathan Gordon, Tim R. B. Davenport, Douglas Gillespie

School/Research organisations

Abstract

Destructive fishing using explosives occurs in a number of countries worldwide, negatively impacting coral reefs and fisheries on which millions of people rely. Documenting, quantifying and combating the problem has proved problematic. In March–April 2015 231 h of acoustic data were collected over 2692 km of systematically laid transects along the entire coast of Tanzania. A total of 318 blasts were confirmed using a combination of manual and supervised semi-autonomous detection. Blasts were detected along the entire coastline, but almost 62% were within 80 km of Dar es Salaam, where blast frequency reached almost 10 blasts/h. This study is one of the first to use acoustic monitoring to provide a spatial assessment of the intensity of blast fishing. This can be a useful tool that can provide reliable data to define hotspots where the activity is concentrated and determine where enforcement should be focused for maximum impact.
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Details

Original languageEnglish
Pages (from-to)360-366
JournalMarine Pollution Bulletin
Volume125
Issue number1-2
Early online date27 Sep 2017
DOIs
Publication statusPublished - 15 Dec 2017

    Research areas

  • Explosives, Destructive fishing, Acoustic monitoring, Tanzania, Resource management, Fisheries management

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