Study

Hook selectivity models assessment for black spot seabream. Classic and heuristic approaches

  • Published source details Czerwinski I.A., Gutiérrez-Estrada J.C., Casimiro-Soriguer-Escofet M. & Hernando J.A. (2010) Hook selectivity models assessment for black spot seabream. Classic and heuristic approaches. Fisheries Research, 102, 41-49.

Actions

This study is summarised as evidence for the following.

Action Category

Use a different hook type

Action Link
Marine Fish Conservation
  1. Use a different hook type

    A replicated study in 2000–2005 on rocky seabed in the Strait of Gibraltar, Spain (Czerwinski et al. 2010) found that larger hooks improved the size-selectivity of black spot seabream Pagellus bogaraveo compared to smaller hooks in a longline fishery, but depended on size structure of the population being fished. Across both trials, the average length of seabream caught, and the subsequent estimates of size-selectivity, differed between all four hook sizes (except in the second trial for two hooks of similar dimensions, sizes 9.5 and 10), and increased with increasing hook size (data reported as graphical analyses). In addition, seabream length frequencies and selectivity estimates differed between trials as the result of differences in the size structures of the populations encountered. Two experimental fishing trials using four sizes of circular hook were done on a commercial vessel in the Strait of Gibraltar from November 2000 to July 2005. Trial one tested three hook sizes (9, 10, 11, largest to smallest) on 50 longline sets (3,500 hooks of each size). Trial two tested a size 9.5 hook with sizes 9 and 10 during 106 sets (7,420 hooks each size). See original paper for hook dimensions. All hooks were baited with sardine Sardina pilchardus and fishing was done at depths up to 850 m over rocky seabed.

    (Summarised by: Leo Clarke)

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 19

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