Study

The effect of pingers on harbour porpoise, Phocoena phocoena bycatch and fishing effort in the turbot gill net fishery in the Turkish Black Sea coast

  • Published source details Gönener S. & Bilgin S. (2009) The effect of pingers on harbour porpoise, Phocoena phocoena bycatch and fishing effort in the turbot gill net fishery in the Turkish Black Sea coast. Turkish Journal of Fisheries and Aquatic Sciences, 9, 151-157.

Actions

This study is summarised as evidence for the following.

Action Category

Use acoustic devices on fishing gear

Action Link
Marine and Freshwater Mammal Conservation
  1. Use acoustic devices on fishing gear

    A controlled study in 2006 of a pelagic area in the Black Sea, Turkey (Gönener & Bilgin 2009) found that fishing nets with acoustic devices attached had fewer entanglements of harbour porpoises Phocoena phocoena than nets without acoustic devices. Harbour porpoise entanglement rates were lower in nets with acoustic devices (0.01 porpoises/day) than in those without acoustic devices (0.47 porpoises/day). Catch rates of target Black Sea turbot Schophthalmus maeoticus were higher in nets with active acoustic devices (1.1 fish/day) than in those without (0.5 fish/day). During each of 20 fishing trips, one gill net string was deployed with acoustic devices attached (Dukane NetMark 1000 emitting 300 ms signals every 4 seconds at 10–12 kHz, spaced 200 m apart) and one was deployed without acoustic devices. Each string comprised 16 nets tied together (total length 1.1 km, 160 mm mesh size). Nets were deployed at depths of 17–183 m for 168–288 h. Entangled porpoises and fish catches were recorded during each of the 20 fishing trips in March–April 2006.

    (Summarised by: Anna Berthinussen)

Output references
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 21

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.


Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape ProgrammeRed List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Mauritian Wildlife Supporting Conservation Leaders
Sustainability Dashboard National Biodiversity Network Frog Life The international journey of Conservation - Oryx Cool Farm Alliance UNEP AWFA Bat Conservation InternationalPeople trust for endangered species Vincet Wildlife Trust