Study

Gill net selectivity for Diplodus annularis and Mullus surmuletus in Greek waters

  • Published source details Petrakis G. & Stergiou K.I. (1995) Gill net selectivity for Diplodus annularis and Mullus surmuletus in Greek waters. Fisheries Research, 21, 455-464.

Actions

This study is summarised as evidence for the following.

Action Category

Use a larger mesh size

Action Link
Marine Fish Conservation
  1. Use a larger mesh size

    A replicated study in 1992-1993 of an area of seabed in the Aegean Sea, Greece (Petrakis & Stergiou 1995, same experimental set-up as Petrakis & Stergiou 1996) found that increasing the mesh size of a gillnet improved the size-selectivity of annular seabream Diplodus annularis and striped red mullet Mullus surmuletus compared to smaller mesh sizes. For both species, the average length of fish caught was greater for the largest mesh size of 23 mm (seabream: 119 mm, mullet: 165 mm) than a 21 mm mesh (seabream: 109 mm, mullet: 150 mm), a 19 mm mesh (seabream: 98 mm, mullet: 136 mm) and a 17 mm mesh (seabream: 88 mm, mullet: 122 mm). In addition, total catch decreased with increasing mesh size for seabream (23 mm: 121, 21 mm: 352, 19 mm: 123, 17 mm: 126 fish/1000 fathoms) and mullet (23 mm: 102, 21 mm: 73, 19 mm: 116, 17 mm: 352 fish/1000 fathoms). Fishing trials took place at 15 sites in the South Euboikos Gulf between August 1992 and April 1993. Nets were set two hours before sunrise and hauled two hours after sunrise at depths from 18–60 m. Gillnets with mesh sizes of 23 mm, 21 mm, 19 mm or 17 mm were switched monthly. Weight and length of captured fish were recorded.

    (Summarised by: Chris Barrett/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