Survival of juvenile herring (Clupea harengas membras) after passing through a selection grid in a pontoon trap

  • Published source details Lundin M., Calamnius L. & Lunneryd S. (2012) Survival of juvenile herring (Clupea harengas membras) after passing through a selection grid in a pontoon trap. Fisheries Research, 127-128, 83-87.


This study is summarised as evidence for the following.

Action Category

Modify fishing trap/pot configuration

Action Link
Marine Fish Conservation
  1. Modify fishing trap/pot configuration

    A replicated, controlled study in 2010 in an inshore area of the Bothnian Sea, Sweden (Lundin et al. 2012) found that survival rates of trap-caught small Baltic herring Clupea harengus membras that had passed through a size-sorting escape grid were similar to trap-caught herring that had not passed through a grid. The mortality of herring that had passed through the escape grid was 3–13% compared to 7–45% for herring caught without a grid. When the effects of water temperature variations during the trials were considered, no significant difference in mortality rates between traps was found. Herring were sampled in a herring trap (pontoon trap) in six alternate trials in July-September 2010: three using a stainless steel sorting grid with 14 mm bar spacing and three with no grid. Small herring were caught in the trap by passing through a sorting grid mounted at the entrance of the fish chamber. The trap was then closed and the herring retained in situ for seven days. As control fish, herring of all sizes were trapped without passing through any grid. Numbers of herring enclosed varied between 172 and 2,170. For each trial, herring survival rates after the seven days were assessed.

    (Summarised by: Natasha Taylor)

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