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Fishing Case Study #1

Fishing Case Study #1. Orange Roughy: Hoplostethus atlanticus. 2 Questions to Answer. Use the information in this powerpoint , to answer these questions with as much data and information as possible. What steps have humans taken to increase orange roughy populations?

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Fishing Case Study #1

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  1. Fishing Case Study #1 Orange Roughy: Hoplostethus atlanticus

  2. 2 Questions to Answer Use the information in this powerpoint, to answer these questions with as much data and information as possible. • What steps have humans taken to increase orange roughy populations? • Why is conservation of the orange roughy difficult?

  3. What kind of habitat would this sort of fish inhabit? http://www.all-fish-seafood-recipes.com/images/Orange_Roughy.jpg

  4. A 3-D Rendering • http://www.youtube.com/watch?v=eNoYb_UWFzo

  5. Orange Roughy School • http://www.youtube.com/watch?v=IJj6AJyyhgA • Pretty rare video—scientists were all excited to see this!

  6. Niche: place in the food chain • This species is thought to be an opportunistic predator, using currents and eddies around marine features to prey on prawns, squid, crustaceans, and small fishes. • 4th trophic level = tertiary consumer

  7. Age • The orange roughy is a long lived fish that grows slowly, matures late (~30 years) and lives up to 130 years. (video later says 180 years!)

  8. Juvenile Roughy http://www.niwa.co.nz/sites/default/files/images/imported/0020/45272/or.jpg

  9. Range North and South Atlantic, Indian Ocean, southwestern and eastern Pacific

  10. Abiotic Habitat Features Orange roughy lives in very deep waters from 500-1500m worldwide. Need prominent topographic features such as seamounts, particularly during spawning and feeding.

  11. Swimming on a Sea Mount http://1.bp.blogspot.com/-3GJlgpbpsqg/TXX6zQ0kAaI/AAAAAAAAABM/oM_wSiy_sOs/s1600/orange-roughy%252C-%2528C%2529-Malcolm-.jpg

  12. Orange Roughy Hide-Out http://farm7.static.flickr.com/6068/6129608001_fb36e61929.jpg

  13. Orange Roughy Adaptation • Special proteins in the eyes let them see bioluminescence and deep sea lighting • Go through phases when they are mostly inactive and do not feed. During this time the fish is slow and sluggish and their colour fades. This may be an adaptation to their deep sea environment and a way of coping when there is no food available.

  14. A Video: • Notice the importance of science, technology, and the orange roughy in this video. • http://www.youtube.com/watch?v=033_7A35xls • Notice: the need for a baseline • How many orange roughy are there?

  15. Fishing Orange Roughy http://www.southernfriedscience.com/wp-content/uploads/2010/08/Full-net-of-Orange-Roughy-o.jpg

  16. http://www.greenpeace.org/international/ReSizes/OriginalWatermarked/Global/international/planet-2/image/2006/1/a-good-catch-of-orange-roughy.jpghttp://www.greenpeace.org/international/ReSizes/OriginalWatermarked/Global/international/planet-2/image/2006/1/a-good-catch-of-orange-roughy.jpg

  17. http://assets.panda.org/img/industrial_fishing_109842_384663.jpghttp://assets.panda.org/img/industrial_fishing_109842_384663.jpg

  18. By-catch • Bycatch of orange roughy tends to be low because fish gather around seamounts and are captured as schools. • Bycatch of other fish caught with the roughy is high.

  19. By-catch with Roughy is high! • A study from the oldest fishery in New Zealand showed declines in the abundance of 10/18 of the species that have been regular bycatch in orange roughy fisheries between 1979 to 1997 (e.g. black oreo, smooth oreo, deepwater dogfish, slickheads, rattails and basketwork eels and sharks).

  20. Should we eat Orange Roughy? • http://www.seafoodwatch.org/seafood-recommendations/detail/54/orange-roughy-wild-worldwide-hoplostethus-atlanticus?q=Orange%20Roughy • http://apps.edf.org/page.cfm?tagID=15817 • Notice the bioaccumulation. • http://www.blueocean.org/files/Seafood_Guide.pdf (page 2)

  21. Threats to the Roughy! • Caught with bottom trawls that damage the seafloor and catch any species in their path. • Populations of the fish have been wiped out by overfishing and may take decades to recover.

  22. Fisheries Status • All fisheries have peaked. • All are currently in decline. • Only some have limits. • Fisheries included: • New Zealand and Australia • northeast Atlantic • Namibia • Chile

  23. Technology: Acoustic Survey

  24. Technology: ROVs • http://rst-marine.com/FileLibrary/Images/Equipment/Searay%20ROV%20and%20acoustic%20device.JPG

  25. Why is conservation difficult? • The orange roughy aggegrates when spawning, so the whole school gets caught. • The orange roughy is extremely vulnerable to fishing pressure because it grows slowly, does not reproduce until 30 years of age, and lives up to 130 years. • They also have a low fecundity (reproductive rate) and may spawn irregularly. • http://www.oneworldoneocean.com/blog/entry/the-red-list-orange-roughy scroll down to video at bottom

  26. Steps Being Taken Now • Monitoring stock recovery. • New Zealand and Australia implemented a quota system, which is adjusted each year based in stock assessments and best available science. Stamp from the Faroe Islands

  27. Management has not addressed: • the overall effect of trawling • loss of considerable orange roughy biomass in deep-sea ecosystems. Image from Greenpeace and very biased….

  28. Basketwork Eel http://wonderigo.com/wp-content/uploads/2011/04/04wonderigo.com_.jpg

  29. Smooth Oreo http://www.fooduniversity.com/foodu/seafood_c/resources/ocean%20fin/Cold%20Water/Dory/smoothOreoDory.gif

  30. Slickhead http://www.google.com/imgres?imgurl=http://oceanexplorer.noaa.gov/explorations/03mountains/logs/summary/media/alepo_600.jpg&imgrefurl=http://oceanexplorer.noaa.gov/explorations/03mountains/logs/summary/media/alepo.html&usg=__PYm3tpq3vZ5H4-ygQMULcTChRQo=&h=450&w=600&sz=47&hl=en&start=1&zoom=1&tbnid=peuHQV3RnxXhbM:&tbnh=101&tbnw=135&ei=gPfXTsn7B-LkiALPnazDCQ&prev=/search%3Fq%3Dslickhead%26um%3D1%26hl%3Den%26sa%3DN%26rlz%3D1T4ADSA_enUS421US421%26tbm%3Disch&um=1&itbs=1

  31. Rattails http://www.google.com/imgres?imgurl=http://www.mbari.org/news/feature-image/rattail-450.jpg&imgrefurl=http://www.mbari.org/news/feature-image/rattail.html&usg=__rO34Nmr27Jw2pmLOJLq6kJYPyIo=&h=339&w=450&sz=45&hl=en&start=4&zoom=1&tbnid=Y1L6_mhmbnyetM:&tbnh=96&tbnw=127&ei=w_fXTqbPEqShiQKB8ritCg&prev=/search%3Fq%3Drattails%26um%3D1%26hl%3Den%26sa%3DN%26rlz%3D1T4ADSA_enUS421US421%26tbm%3Disch&um=1&itbs=1

  32. 2 Questions to Answer Use the information in this powerpoint, to answer these questions with as much data and information as possible. • What steps have humans taken to increase orange roughy populations? • Why is conservation of the orange roughy difficult?

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