Home > Research > Publications & Outputs > Fishery benefits from exploiting spawning aggre...

Electronic data

  • Robinson et al_manuscript_v2

    Rights statement: This is an Accepted Manuscript of an article published by Taylor & Francis in African Journal of Marine Science on 15/11/2017, available online: http://www.tandfonline.com/10.2989/1814232X.2017.1364665

    Accepted author manuscript, 152 KB, PDF document

    Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License

Links

Text available via DOI:

View graph of relations

Fishery benefits from exploiting spawning aggregations not solely dependent on enhanced fish density

Research output: Contribution to journalJournal article

Published
Close
<mark>Journal publication date</mark>2017
<mark>Journal</mark>African Journal of Marine Science
Issue number3
Volume39
Number of pages10
Pages (from-to)269-278
Publication statusPublished
Early online date15/11/17
Original languageEnglish

Abstract

The vulnerability of spawning aggregations to exploitation varies among fisheries as a result of differences in the population-density changes associated with this behaviour. However, vulnerability to fishing is also influenced by technology, environmental factors, and fish and fisher behaviours. Focusing on a fishery for the rabbitfish Siganus sutor at Praslin Island, Seychelles, we examined how catch rate varied across spawning and non-spawning habitats in relation to in situ population-density changes and other factors known to influence catchability. Catch rates in spawning habitat were disproportionate to density changes, being only fourfold greater than catch rates in non-spawning habitat, despite the fact that spawning-aggregation formation involved nine- to thirteen-fold increases in population density. Catch rates in spawning habitat were also highly variable across the spawning season (0–23.4 fish trap-hour−1). Current strength was of similar importance to density as a catch-rate predictor, with the highest catch rates in spawning habitats confined to months with the strongest currents. Therefore, in addition to density-dependent catchability, other factors that influence catch rates must be examined to avoid overestimation of the vulnerability of populations to aggregation fishing. The dynamics of catchability at spawning sites can limit the ability of fishers to predict and maximise returns based on increases in fish density.

Bibliographic note

This is an Accepted Manuscript of an article published by Taylor & Francis in African Journal of Marine Science on 15/11/2017, available online: http://www.tandfonline.com/10.2989/1814232X.2017.1364665