lake nicaraguasciencewithburdick.weebly.com/.../fish_group_presentation___1_.pdf · fish species....
TRANSCRIPT
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Lake NicaraguaCaroline Burdick, Sarah Heath, Jeremy Clothier, Alexandra Harding
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Ecosystem Description
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Geographic Location
 
19th largest lake in world
Largest in C. Am.
9th largest in Americas
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Geologic History
● Ocean Bay => volcanic eruption = inland basin containing two lakes, linked by the Tipitapa River
● “The Great Lake of Nicaragua” until the level dropped to form the two lakes.
Subducting plate
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Geography
Area:
Area: 3,149 square miles Length: 110 miles Average width: 36 milesDepth at center: About 60 feet Deepest point: 200ft
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Geography
● More than 40 rivers drain into the lake
● Rio San Juan flows for 112 miles to the Caribbean Sea
● On west side, lake is separated by a 12 mile wide isthmus
● Punctuated by volcano islands
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Physical and Chemical Characteristics
● Volcanic rocks at bottom of lake => dissolved Magnesium and Potassium salts
● Surface water temp- mid-70s ● Bottom temperature- low 60s
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Seasonal and Annual Variation
Water level drops 2 feet (65cm) during dry
season (December to April)
Levels rise during rainy season (May-October)
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●
Climatic Conditions
Tropical Savannah
Rainforest (disturbed)
Cloud Forest (Mombacho)
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Ometepe Island
● 275 km2 area formed by volcanoes Concepcion and Maderas, connected by a low and frequently flooded isthmus.
● Ometepe- 15,000 population
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Isla Ometepe
5301 feet (1616 meters) above sea level
Periodically ejects sand, ash and lava
Volcan Concepcion
Erupted more than 25 times in last 120 years. First recorded activity was AD 1883
Maderas
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Maderas
Extinct, truncate volcano of 4377 ft (1334 m), covered with dense vegetation. Lots of coffee groves!
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Zapatera Island
● Dormant volcano (2,064 ft- 629 m) with rocky coasts surrounded by semicircular islands, the remains of partially flooded craters
● “Mausoleum island” in pre-Spanish times
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Las Isletas
North of lake=> Las Isletas (islets) form an arc-shaped rocky peninsula surrounded by islets- results of a massive avalanche torn off from volcano Mombacho
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Anthropogenic Modifications
● Waste-water
● Agriculture● Cattle● Chemicals● Fertilizers
● Mining● Drought● Deforestation
● Just wait, THERE’S MORE….
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General Description of Fish Habitats
● Bottom of lake= muddy regardless of depth
● Near Ometepe, rocky places
● Sandy bottoms SW of Ometepe (probably from recent eruptions)
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Fish Species
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Cichlids Galore
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The Largetooth Sawfish
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The Almost Nicaragua Bull Shark
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Non-Native Fish
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Fisheries of Lake Nicaragua
●
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Historical Fisheries
● Mostly subsistence fishing
● No need for management
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Then the 1970’s Happened
● Granada processing plant
● Let the games begin!
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The 1980’s Bring Management
● Nicaragua Fisheries Institute
● Began regulating their fish resources
● Is now the National Fisheries and Aquaculture Administration
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Movement Towards Aquaculture
● Now have a slightly more responsible mindset
● Aquaculture takes over
● Tilapia
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Sportfishing
● Tarpon, snook, bass, machacas
● Regulations
● Tourism
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Using Fish for Profit
● Sums up the attitude towards fish in the Lake
● Overall fish are secondary
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Management and Conservation
Located in the Lake Nicaragua - San Juan River basin system, which does not fall into only one management area.
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Management and Conservation
Some key players:
Ministry of Environment and Natural Resources (MARENA)-Nicaragua
Ministry of Energy, Resources, and Mines (MINAE) -Costa Rica
Current lake management practices include:
Tracking surrounding land use and monitoring of water quality.
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Management and Conservation
Management and regulation of water resources in Nicaragua seem to be well defined in legislation, but there are issues with implementation.
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Management and Conservation: Current and Future Issues
One HUGE issue stands apart from the rest:
The Nicaragua Canal
● A 173-mile trans oceanic canal that will cut through the lake
● Nicaraguan government signed agreement with Chinese company for the $50 billion dollar project
● Construction slated to begin on Dec. 22nd (this year!)
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How it came about
It has come up before in the past, but never happened. This time it looks to be the real thing:
● The Nicaraguan government signed an agreement with a chinese company to construct the canal.
● Who is the person behind the chinese interest?
41 year old Wang Jing, a chinese billionaire
● Nicaragua agreed because they see this as an economic opportunity...but at what cost?
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A few Details
● 174 miles long● 500+ yards wide ● A depth of 27.6 meters has been proposed● The canal would require an extensive lock
system requiring dams to be built.
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Oil Tankers in Already Threatened and Endangered Fish Habitat
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Issues, so many Issues
● The lake is a major source of fresh drinking water to the country, also implications with clean water for fish
● Already threatened and endangered species in the lake. ● Bilge water from ships● Dams and construction in an area of high seismic activity.● Lock System ● History of volcanism. ● Potential for oil spills. ● Dredging and sedimentation issues ● Wetlands surrounding the lake● Potential for pollution input
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Environmental Review?
Construction is supposed to start this month, but…
The full environmental review set to be carried out by a company called Environmental Resources Management may not be available until March.
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Some Mitigation?
A few important mitigation measures mentioned at a recent meeting:
● Site in the port was changed to preserve mangrove swamps● Plan to use no explosives to dredge the channel through the lake
(they want to use another special technique for sediment removal) Impacts on fish?
● Environmental Resource Management has identified the island of Ometepe as an area of great biological importance.
● Route was changed to avoid the San Miguelito Wetlands
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Future?
What will things look like in a few years? Further down the road?
We Don’t Know!
Fisheries will be changed forever.
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Sources
● http://pubs.usgs.gov/of/2001/0457/● http://www.volcano.si.edu/volcano.cfm?vn=344111● http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1001&context=ichthy
nicar● http://www.elasmo-research.org/education/ecology/fresh-bull.htm● http://www.pri.org/stories/2012-01-07/nicaraguas-gold-mining-industry-boom
ing-boosting-countrys-economy● http://www.fsdinternational.org/country/nicaragua/envissues● http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1018&context=ichthy
nicar
● Koenig, Kurt W.; Beatty, Richard J.; and Martinez C., Sergio, "Species Diversity and Distribution of Fish in Lake Nicaragua" (1976). Investigations of the Ichthyofauna of Nicaraguan Lakes. Paper 19.
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Sources
Other Sources–List of Cichlid species and care needs http://badmanstropicalfish.com/cichlid_of_month/Lake_Nicaragua.html
–Largetooth sawfish data http://www.nmfs.noaa.gov/pr/species/fish/largetoothsawfish.htm
–General informationhttp://vivatropical.com/nicaragua/lake-nicaragua/
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Sources
Scholarly Sources–Tagging Study on Bull Sharks http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1037&context=ichthynicar&sei-redir=1&referer=http%3A%2F%2Fscholar.google.com%2Fscholar%3Fhl%3Den%26q%3DLake%2BNicaragua%2Bshark%26btnG%3D%26as_sdt%3D1%252C38%26as_sdtp%3D#search=%22Lake%20Nicaragua%20shark%22
–Study of Species Diversity and Distribution http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1018&context=ichthynicar
–Study of Cichlid Distribution http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1024&context=ichthynicar
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Sources
● Lake Basin Management Initiative Experience and Lessons Learned Brief: Lake Cocibolca/Nicaragua
http://www.worldlakes.org/uploads/cocibolca_30sep04.pdf
● http://www.nature.com/news/conservation-nicaragua-canal-could-wreak-environmental-ruin-1.14721● http://www.npr.org/2014/02/20/279710270/scientists-fear-ecological-disaster-in-nicaraguas-planned-canal● http://www.npr.org/blogs/parallels/2014/08/14/340402716/nicaragua-banks-on-its-own-canal-to-boost-economy● http://www.telegraph.co.uk/news/worldnews/centralamericaandthecaribbean/nicaragua/10952824/Nicaragua-app
roves-route-for-23bn-rival-to-Panama-Canal.html● http://www.telegraph.co.uk/news/worldnews/centralamericaandthecaribbean/nicaragua/11167697/Giant-canal-thr
eatens-way-of-life-on-the-banks-of-Lake-Nicaragua.html● https://play.google.com/books/reader?id=ss5IAAAAMAAJ&printsec=frontcover&output=reader&hl=en● http://www.worldlakes.org/lakedetails.asp?lakeid=8934● http://media.economist.com/sites/default/files/cf_images/19980822/cam573.gif● http://insidecostarica.com/2014/11/28/nicaragua-hknd-plan-mitigate-environmental-impact-canal● https://www.youtube.com/watch?v=xtn3jgsDqUc
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Sources
● Lake Nicaragua Fishery Resources WILLIAM D. DAVIES, university of Nebraska-lincoln http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1015&context=ichthynicar
● Tilapia (Teleostei: Cichlidae) status in Nicaraguan natural waters, http://www.gaianicaragua.org/EBF2007TILAPIA.pdf
● Food and agriculture department of the united nations: fisheries and aquaculture, http://www.fao.org/fishery/countrysector/naso_nicaragua/en#tcN70085
● San Carlos Sport Fishing, http://www.nicaraguafishing.com/english%202.htm
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Sources
● Sport fishing regulations, https://vianica.com/activitydetails/150/sport-fishing-in-rio-san-juan
● Personal perspectives on gill netting in lake Nicaragua, http://www.nicaragua-community.com/past-present-potential-future-fishing-isletas-granada/