Study

Mobile fishing gear reduces benthic megafaunal production on Georges Bank

  • Published source details Hermsen J., Collie J. & Valentine P. (2003) Mobile fishing gear reduces benthic megafaunal production on Georges Bank. Marine Ecology Progress Series, 260, 97-108

Actions

This study is summarised as evidence for the following.

Action Category

Cease or prohibit all towed (mobile) fishing gear

Action Link
Subtidal Benthic Invertebrate Conservation
  1. Cease or prohibit all towed (mobile) fishing gear

    A before-and-after, site comparison study in 1994–2000 of four sites of sandy and gravelly seabed on Georges Bank, North Atlantic Ocean, USA and Canada (Hermsen et al. 2003) found an increase in invertebrate biological production in shallow and deep sites closed to towed fishing gear compared to adjacent fished sites approximately five years after closure. Biological production (a measure of biomass regeneration over time) from invertebrates at shallow (45–62 m) sites closed to fishing increased following closure (before: 17; after: 215 kcal/m2/year), and was higher than at shallow fished sites where production did not vary over time (before: 32; after: 57 kcal/m2/year). Production at deep (80–90 m) sites closed to fishing also increased following closure (before: 174; after: 256 kcal/m2/year), and was higher than at deep fished sites where production did not vary over time (before: 52; after: 30 kcal/m2/year). In January 1995, a combined area of approximately 10,000 km2 of Georges Bank was closed to all bottom towed fishing gear. Invertebrates (>5 mm) were sampled with a dredge (6.4 mm mesh) at four sites across the two depth ranges (‘shallow’ and ‘deep’). Shallower sites are subject to more intense and regular fishing. At each depth, one closed and one fished site were sampled. Animals were identified, counted and weighed. Individuals from the 20 most abundant species were measured. Biological production was estimated from a combination of biomass and length-frequency distribution data.

Output references

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, terrestrial 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 18

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 Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust