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Weever fish

Weever fish. Richard D.M. Nash 1 , Audrey J.Geffen 1,2 & Henk Heessen 3 1. Port Erin Marine Laboratory, University of Liverpool, Isle of Man, British Isles 2. Department of Biology, University of Bergen, Norway 3 Netherlands Institute for Fisheries Research, IJmuiden, The Netherlands.

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Weever fish

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  1. Weever fish Richard D.M. Nash1, Audrey J.Geffen1,2 & Henk Heessen3 1. Port Erin Marine Laboratory, University of Liverpool, Isle of Man, British Isles 2. Department of Biology, University of Bergen, Norway 3 Netherlands Institute for Fisheries Research, IJmuiden, The Netherlands What the non-commercially exploited species can tell us about climate change

  2. Why have an interest in non-commercial species? Changes in population size are not directly driven by commercial fishing. However, changes in population size may be a consequence of fishing operations due to changes in habitat, ecosystem status and/or predator/prey relationships. Therefore one cannot just choose any species if one wants to try and look at possible effects of climate change on fish populations and areas.

  3. The potential players et al.

  4. Why the interest?

  5. Lesser weever: Echiichthys vipera

  6. Distribution of Lesser Weever Azores Canaries

  7. Lesser Weever Classed as sub-tropical Not commercially exploited Very few predators Generally found on soft substrata Buries Spawns June to August Juveniles tend to be inshore and larger adults further offshore Tends to inhabit areas <50m depth

  8. Wheeler, A. 1978. Key to the Fishes of Northern Europe. It has no value to fishermen or anglers, and its chief impact on man is in being one of very few dangerous fishes in European seas. Totenese, E. 1986. CLOFNAM. This species is considered the most dangerous of the European weevers, both for its poison and for its frequent occurrence very near to beaches.

  9. North Sea • Annual changes in lesser weever distribution • Annual changes in lesser weever abundance • Changes in lesser weever length frequencies

  10. IBTS

  11. Lesser Weever: Latitude of population centre

  12. Irish Sea • Distribution of lesser weever • Annual changes in population size of lesser weever • Annual variation in production of lesser weever • Changes in condition of lesser weever

  13. Distribution of Lesser Weever in the Irish Sea

  14. Simulated drift of plaice eggs and larvae, in the Irish Sea, after 31 and 61 days. Vertical movement behaviour patterns allowed for larvae. Data based on distribution of eggs and current patterns in 1995. Data from DEFRA/CEFAS funded research (MF0425) - plaice

  15. Juvenile lesser weever (and plaice) and nursery grounds in the eastern Irish Sea Zone 3 Blackpool and Morecambe Zone 1 Red Wharf Bay and Penmaenmawr

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