Limit or prohibit specific fishing methods

How is the evidence assessed?
  • Effectiveness
    not assessed
  • Certainty
    not assessed
  • Harms
    not assessed

Study locations

Key messages

  • One study evaluated the effects of limiting or prohibiting specific fishing methods on reptile populations. This study was in Brazil.



  • Abundance (1 study): One site comparison study in Brazil found that in areas where a fishing agreement was implemented that involved limiting the use of gill nets along with a wider suit of measures had more river turtles than areas that did not implement the agreement.


About key messages

Key messages provide a descriptive index to studies we have found that test this intervention.

Studies are not directly comparable or of equal value. When making decisions based on this evidence, you should consider factors such as study size, study design, reported metrics and relevance of the study to your situation, rather than simply counting the number of studies that support a particular interpretation.

Supporting evidence from individual studies

  1. A site comparison study in 2009 on a flood plain with a variety of lakes and channels in Pará, Brazil (Miorando et al. 2013) found that areas that had community-based management (CBM) of fishing practices – including limiting use of gill-nets, seasonal fishing restrictions, protecting turtle nesting beaches and a ban on turtle trading – had more river turtles Podocnemis sextuberculata, Podocnemis unifilis and Podocnemis expansa than areas without CBM. The effect of different aspects of the management programme cannot be separated. Turtles were more abundant in areas with CBM (321 individuals) than in areas without CBM (33 individuals). For Podocnemis sextuberculata, abundance was higher in areas with CBM (14 individuals/1,000 m2 netting/12 hours) than in areas without (2 individuals/1,000 m2 netting/12 hours), and turtle biomass was also greater (with CBM: 20 kg/1,000 m2 netting/12 hours; without CBM: 3 kg/1,000 m2 netting/12 hours). The fishing agreement that formed the CBM programme had been in place for 20–30 years. While 13 communities in the area were a part of the fishing agreement, only two implemented the agreement. Turtle numbers were sampled at 14 sites (7 with CBM; 7 without CBM) in August–October 2009 using gill nets (15 nets/site; 215 m2 nets; 3 each of 5 mesh sizes) with help from local fishers.

    Study and other actions tested
Please cite as:

Sainsbury K.A., Morgan W.H., Watson M., Rotem G., Bouskila A., Smith R.K. & Sutherland W.J. (2021) Reptile Conservation: Global Evidence for the Effects of Interventions for reptiles. Conservation Evidence Series Synopsis. University of Cambridge, Cambridge, UK.

Where has this evidence come from?

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Reptile Conservation

This Action forms part of the Action Synopsis:

Reptile Conservation
Reptile Conservation

Reptile Conservation - Published 2021

Reptile synopsis

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