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The species of mosquito larvae and water quality in shrimp ponds,Trang province.

Organization(s):Princess Chulabhorn Science High School Trang
Country:Thailand
Student(s):Prangnapas Kongneam and Annop Sangkamanee
Grade Level:Secondary School (grades 9-12, ages 14-18)
GLOBE Educator(s):Patchara Pongmanawut
Contributors:Princess Chulabhorn Science High School Trang , Assoc. Prof. Dr. Krisanadej Jaroensutasinee, Assoc. Prof. Dr. Mullica Jaroensutasinee
Report Type(s):International Virtual Science Symposium Report
Protocols:Conductivity, pH, Water Temperature, Salinity, Dissolved Oxygen, Mosquitoes
Presentation Video: View Video
Presentation Poster: View Document
Language(s):
Date Submitted:03/01/2018
This research aimed to study the mosquito larvae and water qualities in shrimp ponds in 3 districts (Palian, Yan Ta Khao and Hat samran) of Trang province. A total of 31 shrimp ponds were sampled in February 2018. The mosquito larvae were sampled from a shrimp pond using a one liter dipper and preserved the mosquito larvae in 90% ethanol in the laboratory. We recorded water qualities (pH, salinity, conductivity, temperature and dissolved oxygen) in each pond. We identified the mosquito larvae up to genus level and counted the numbers. The results show that mosquito larvae (only Culex spp.) were present only in 9 ponds among 31 ponds, and mosquito larvae numbers did not differ among these 9 ponds. Mosquito larvae were found in Palian (1241 Culex mosquito) and Hat samran (589 Culex mosquito) districts. Salinity and temperature were higher in the ponds with mosquito larvae than in the ponds without mosquito larvae (Salinity: t = 3.03, P <0.01; Temperature, t = 0.88, P <0.05). Other parameters did not differ between ponds with and without mosquito larvae. Salinity, conductivity and temperature were positively correlated with the numbers of Culex spp. A total of 283 mosquito larvae were recorded belonging to 4 types in households near shrimp ponds, which included Culex spp. (185), Aedes albopictus (91), Aedes aegypti (7), and Toxorhynchites spp.. Video link: https://youtu.be/0jLwgw4PDBQ


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Comments

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Claudia Cecilia Caro Vera
7 Years Ago
Congratulations for the project. I have a question have you seen some relation between shrimps and mosquitos that would like to share with us?
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Student 2 of Patchara Pongmanawut-Prangnapas Claudia Cecilia Caro Vera
7 Years Ago
Thank you for your kind attention to our projects and for a great question. When we came to each study site to collect the data we noticed that there were 2 types of shrimp ponds such as pond with shrimps and without shrimps. We did not find any mosquito larvae in pond with shrimps but there are a lot of mosquito larvae inside pond without shrimps. And we have learned the way of local farmer to do shrimp farming. First step, they put some chemical substance into the pond to eliminate all living things and wait for weeks. After that if they see the mosquito larvae appear in the surface of water again it can indicate that the water is safe enough for the new generation of the shrimps, they will put the shrimps into the pond. The shrimps will eat mosquito larvae as food and the farmer can save the money for the first week food. But in the big farm, they did not do like local farmer because shrimp can probably infect the disease from mosquito larvae.
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Kevin Czajkowski
7 Years Ago
Wonderful project and presentation. I like that you ran statistics on the data.
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Kevin Czajkowski
7 Years Ago
When you collected your water samples for mosquitoes, did you look for larvae or did you take the sample randomly?
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Student 2 of Patchara Pongmanawut-Prangnapas Kevin Czajkowski
7 Years Ago
Thank you for your question. We collected the water samples randomly. The mosquito larvae were sampled from a shrimp pond using a one liter dipper. We diped the dipper under the surface water to 1 meter or less depth along the side of the water body. The dipper is maintained at an acute angle with respect to the water surface.