Long island sound lobster die off
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Transcript of Long island sound lobster die off
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Long Island Sound Lobster Die-OffThe Perfect Storm of Factors
Contributing to the Demise of A Major Shell fishing Industry on Long Island
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Lobster Background
• Lobsters are Crustaceans, in the Phylum Arthropoda (insects)
• Lobsters are benthic and breathe through gills.
• Lobsters prefer temperatures of 20-21ºC (68-70ºF)
• Lobsters are scavengers, who live in rock holes & crevasses in the seafloor
Lobsters take 7 years to mature
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Limiting Factors Play a Role
• Oxygen is at times limited in prime lobster habitat.– Can you think of when & why
this might be?
• Temperature is at times limited in prime lobster habitat.– Can you think of when & why
this might be?
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Where do you think scavengers frequently find themselves when they’re
scavenging for food in the LIS?
What might the problem be if you
were a lobster caught here
at the wrong time of the year?
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A Changing Habitat
• At the time of the Lobster Die-Off in 1999:– lobsters had been exposed to the high end of their
temperature tolerance for an extended period of time
– As oxygen levels decreased, anaerobic bacteria took over (giving off ammonia & sulfides)
– Hurricane Floyd and other storms caused an extremely big jump in runoff from coastal areas (can you guess what “extra” component was in the runoff this year?)
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Panic!!!! Spray for Mosquitoes!!
Where do you think the sprays in coastal areas
ended up?
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What does West Nile Virus (WNV) have to do with Lobsters?
• In response to public concern about mosquitoes carrying WNV, officials approved of spraying our island with pesticides that were intended to kill the mosquitoes.
• Unfortunately, pesticides don’t just seek out their intended target and then disappear.
• Mosquitoes were not the only Arthropods impacted by the sprays we used
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Environmental & Economic Implications
• Hundreds of thousands of dead lobsters
• Millions of dollars in losses to the lobster fishing families
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What dead lobsters have in common-studies done show. . .
Shell Disease Paramoebas
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Further Reading
• NY Times article:http://query.nytimes.com/gst/fullpage.html?res=940DE7DE123AF934A25753C1A9629C8B63&pagewanted=1