Behavioral responses of Sotalia fluviatilis (cetacea, delphinidae) to acoustic pingers, Fortaleza, Brazil

  • Published source details Monteiro-Neto C., Vila F.J.C.A., Alves-Jr T.T., Araüjo D.S., Campos A.A., Martins A.M.A., Parente C.L., Manuel A., Furtado-Neto R. & Lien J. (2004) Behavioral responses of Sotalia fluviatilis (cetacea, delphinidae) to acoustic pingers, Fortaleza, Brazil. Marine Mammal Science, 20, 145-151.


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 1996–1998 at a coastal site in the South Atlantic Ocean, near Fortaleza, Brazil (Monteiro-Neto et al. 2004) found that float lines with active acoustic devices attached had fewer tucuxi dolphin sightings Sotalia fluviatilis around them than float lines with inactive acoustic devices or no devices. On average, fewer tucuxi dolphins were sighted in two quadrats on either side of a float line with active acoustic devices attached compared to float lines with inactive acoustic devices or no devices attached (data reported as statistical model results). The average number of dolphin sightings did not differ significantly between trials within seven other quadrats that were not immediately adjacent to the float line (see original paper for data). A float line (100 m long) was deployed with active acoustic devices attached (30 trials), inactive (silent) acoustic devices attached (20 trials) and with no devices (55 trials). Each trial lasted 1–7 h. Five acoustic devices (Dukane NetMark 1000) were evenly spaced along the float line. Two observers on the shore recorded dolphin sightings within nine quadrats (0.5–0.9 km2) in a 6-km2 area surrounding the float line during each of the 105 trials between November 1996 and August 1998.

    (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